Merge pull request #314 from wb9688/remove-getnextpageurl

Next page stuff

extractor/src/main/java/org/schabi/newpipe/extractor/ListExtractor.java

@@ -2,7 +2,6 @@ package org.schabi.newpipe.extractor;
 
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
-import org.schabi.newpipe.extractor.utils.Utils;
 
 import java.io.IOException;
 import java.util.Collections;
@@ -10,13 +9,11 @@ import java.util.List;
 
 import javax.annotation.Nonnull;
 
-import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 /**
  * Base class to extractors that have a list (e.g. playlists, users).
  */
 public abstract class ListExtractor<R extends InfoItem> extends Extractor {
-
     /**
      * Constant that should be returned whenever
      * a list has an unknown number of items.
@@ -38,36 +35,22 @@ public abstract class ListExtractor<R extends InfoItem> extends Extractor {
     }
 
     /**
-     * A {@link InfoItemsPage InfoItemsPage} corresponding to the initial page where the items are from the initial request and
+     * A {@link InfoItemsPage InfoItemsPage} corresponding to the initial page
-     * the nextPageUrl relative to it.
+     * where the items are from the initial request and the nextPage relative to it.
      *
      * @return a {@link InfoItemsPage} corresponding to the initial page
      */
     @Nonnull
     public abstract InfoItemsPage<R> getInitialPage() throws IOException, ExtractionException;
 
-    /**
-     * Returns an url that can be used to get the next page relative to the initial one.
-     * <p>Usually, these links will only work in the implementation itself.</p>
-     *
-     * @return an url pointing to the next page relative to the initial page
-     * @see #getPage(String)
-     */
-    public abstract String getNextPageUrl() throws IOException, ExtractionException;
-
     /**
      * Get a list of items corresponding to the specific requested page.
      *
-     * @param pageUrl any page url got from the exclusive implementation of the list extractor
+     * @param page any page got from the exclusive implementation of the list extractor
      * @return a {@link InfoItemsPage} corresponding to the requested page
-     * @see #getNextPageUrl()
+     * @see InfoItemsPage#getNextPage()
-     * @see InfoItemsPage#getNextPageUrl()
      */
-    public abstract InfoItemsPage<R> getPage(final String pageUrl) throws IOException, ExtractionException;
+    public abstract InfoItemsPage<R> getPage(final Page page) throws IOException, ExtractionException;
-
-    public boolean hasNextPage() throws IOException, ExtractionException {
-        return !isNullOrEmpty(getNextPageUrl());
-    }
 
     @Override
     public ListLinkHandler getLinkHandler() {
@@ -80,23 +63,22 @@ public abstract class ListExtractor<R extends InfoItem> extends Extractor {
 
     /**
      * A class that is used to wrap a list of gathered items and eventual errors, it
-     * also contains a field that points to the next available page ({@link #nextPageUrl}).
+     * also contains a field that points to the next available page ({@link #nextPage}).
      */
     public static class InfoItemsPage<T extends InfoItem> {
         private static final InfoItemsPage<InfoItem> EMPTY =
-                new InfoItemsPage<>(Collections.<InfoItem>emptyList(), "", Collections.<Throwable>emptyList());
+                new InfoItemsPage<>(Collections.<InfoItem>emptyList(), null, Collections.<Throwable>emptyList());
 
         /**
          * A convenient method that returns a representation of an empty page.
          *
-         * @return a type-safe page with the list of items and errors empty and the nextPageUrl set to an empty string.
+         * @return a type-safe page with the list of items and errors empty and the nextPage set to {@code null}.
          */
         public static <T extends InfoItem> InfoItemsPage<T> emptyPage() {
             //noinspection unchecked
             return (InfoItemsPage<T>) EMPTY;
         }
 
-
         /**
          * The current list of items of this page
          */
@@ -105,40 +87,40 @@ public abstract class ListExtractor<R extends InfoItem> extends Extractor {
         /**
          * Url pointing to the next page relative to this one
          *
-         * @see ListExtractor#getPage(String)
+         * @see ListExtractor#getPage(Page)
+         * @see Page
          */
-        private final String nextPageUrl;
+        private final Page nextPage;
 
         /**
          * Errors that happened during the extraction
          */
         private final List<Throwable> errors;
 
-        public InfoItemsPage(InfoItemsCollector<T, ?> collector, String nextPageUrl) {
+        public InfoItemsPage(InfoItemsCollector<T, ?> collector, Page nextPage) {
-            this(collector.getItems(), nextPageUrl, collector.getErrors());
+            this(collector.getItems(), nextPage, collector.getErrors());
         }
 
-        public InfoItemsPage(List<T> itemsList, String nextPageUrl, List<Throwable> errors) {
+        public InfoItemsPage(List<T> itemsList, Page nextPage, List<Throwable> errors) {
             this.itemsList = itemsList;
-            this.nextPageUrl = nextPageUrl;
+            this.nextPage = nextPage;
             this.errors = errors;
         }
 
         public boolean hasNextPage() {
-            return !isNullOrEmpty(nextPageUrl);
+            return Page.isValid(nextPage);
         }
 
         public List<T> getItems() {
             return itemsList;
         }
 
-        public String getNextPageUrl() {
+        public Page getNextPage() {
-            return nextPageUrl;
+            return nextPage;
         }
 
         public List<Throwable> getErrors() {
             return errors;
         }
     }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/ListInfo.java

@@ -4,11 +4,9 @@ import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 
 import java.util.List;
 
-import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
-
 public abstract class ListInfo<T extends InfoItem> extends Info {
     private List<T> relatedItems;
-    private String nextPageUrl = null;
+    private Page nextPage = null;
     private final List<String> contentFilters;
     private final String sortFilter;
 
@@ -39,15 +37,15 @@ public abstract class ListInfo<T extends InfoItem> extends Info {
     }
 
     public boolean hasNextPage() {
-        return !isNullOrEmpty(nextPageUrl);
+        return Page.isValid(nextPage);
     }
 
-    public String getNextPageUrl() {
+    public Page getNextPage() {
-        return nextPageUrl;
+        return nextPage;
     }
 
-    public void setNextPageUrl(String pageUrl) {
+    public void setNextPage(Page page) {
-        this.nextPageUrl = pageUrl;
+        this.nextPage = page;
     }
 
     public List<String> getContentFilters() {

extractor/src/main/java/org/schabi/newpipe/extractor/Page.java

@@ -0,0 +1,52 @@
+package org.schabi.newpipe.extractor;
+
+import java.io.Serializable;
+import java.util.List;
+import java.util.Map;
+
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+
+public class Page implements Serializable {
+    private final String url;
+    private final List<String> ids;
+    private final Map<String, String> cookies;
+
+    public Page(final String url, final List<String> ids, final Map<String, String> cookies) {
+        this.url = url;
+        this.ids = ids;
+        this.cookies = cookies;
+    }
+
+    public Page(final String url) {
+        this(url, null, null);
+    }
+
+    public Page(final String url, final Map<String, String> cookies) {
+        this(url, null, cookies);
+    }
+
+    public Page(final List<String> ids) {
+        this(null, ids, null);
+    }
+
+    public Page(final List<String> ids, final Map<String, String> cookies) {
+        this(null, ids, cookies);
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public List<String> getIds() {
+        return ids;
+    }
+
+    public Map<String, String> getCookies() {
+        return cookies;
+    }
+
+    public static boolean isValid(final Page page) {
+        return page != null && (!isNullOrEmpty(page.getUrl())
+                || !isNullOrEmpty(page.getIds()));
+    }
+}

extractor/src/main/java/org/schabi/newpipe/extractor/channel/ChannelInfo.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.extractor.channel;
 import org.schabi.newpipe.extractor.ListExtractor.InfoItemsPage;
 import org.schabi.newpipe.extractor.ListInfo;
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
@@ -49,8 +50,8 @@ public class ChannelInfo extends ListInfo<StreamInfoItem> {
 
     public static InfoItemsPage<StreamInfoItem> getMoreItems(StreamingService service,
                                                              String url,
-                                                             String pageUrl) throws IOException, ExtractionException {
+                                                             Page page) throws IOException, ExtractionException {
-        return service.getChannelExtractor(url).getPage(pageUrl);
+        return service.getChannelExtractor(url).getPage(page);
     }
 
     public static ChannelInfo getInfo(ChannelExtractor extractor) throws IOException, ExtractionException {
@@ -81,7 +82,7 @@ public class ChannelInfo extends ListInfo<StreamInfoItem> {
 
         final InfoItemsPage<StreamInfoItem> itemsPage = ExtractorHelper.getItemsPageOrLogError(info, extractor);
         info.setRelatedItems(itemsPage.getItems());
-        info.setNextPageUrl(itemsPage.getNextPageUrl());
+        info.setNextPage(itemsPage.getNextPage());
 
         try {
             info.setSubscriberCount(extractor.getSubscriberCount());

extractor/src/main/java/org/schabi/newpipe/extractor/comments/CommentsInfo.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.extractor.comments;
 import org.schabi.newpipe.extractor.ListExtractor.InfoItemsPage;
 import org.schabi.newpipe.extractor.ListInfo;
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
@@ -39,23 +40,23 @@ public class CommentsInfo extends ListInfo<CommentsInfoItem> {
         InfoItemsPage<CommentsInfoItem> initialCommentsPage = ExtractorHelper.getItemsPageOrLogError(commentsInfo,
                 commentsExtractor);
         commentsInfo.setRelatedItems(initialCommentsPage.getItems());
-        commentsInfo.setNextPageUrl(initialCommentsPage.getNextPageUrl());
+        commentsInfo.setNextPage(initialCommentsPage.getNextPage());
 
         return commentsInfo;
     }
 
-    public static InfoItemsPage<CommentsInfoItem> getMoreItems(CommentsInfo commentsInfo, String pageUrl)
+    public static InfoItemsPage<CommentsInfoItem> getMoreItems(CommentsInfo commentsInfo, Page page)
             throws ExtractionException, IOException {
-        return getMoreItems(NewPipe.getService(commentsInfo.getServiceId()), commentsInfo, pageUrl);
+        return getMoreItems(NewPipe.getService(commentsInfo.getServiceId()), commentsInfo, page);
     }
 
     public static InfoItemsPage<CommentsInfoItem> getMoreItems(StreamingService service, CommentsInfo commentsInfo,
-                                                               String pageUrl) throws IOException, ExtractionException {
+                                                               Page page) throws IOException, ExtractionException {
         if (null == commentsInfo.getCommentsExtractor()) {
             commentsInfo.setCommentsExtractor(service.getCommentsExtractor(commentsInfo.getUrl()));
             commentsInfo.getCommentsExtractor().fetchPage();
         }
-        return commentsInfo.getCommentsExtractor().getPage(pageUrl);
+        return commentsInfo.getCommentsExtractor().getPage(page);
     }
 
     private transient CommentsExtractor commentsExtractor;

extractor/src/main/java/org/schabi/newpipe/extractor/feed/FeedInfo.java

@@ -45,7 +45,7 @@ public class FeedInfo extends ListInfo<StreamInfoItem> {
 
         final InfoItemsPage<StreamInfoItem> itemsPage = ExtractorHelper.getItemsPageOrLogError(info, extractor);
         info.setRelatedItems(itemsPage.getItems());
-        info.setNextPageUrl(itemsPage.getNextPageUrl());
+        info.setNextPage(itemsPage.getNextPage());
 
         return info;
     }

extractor/src/main/java/org/schabi/newpipe/extractor/kiosk/KioskInfo.java

@@ -23,6 +23,7 @@ package org.schabi.newpipe.extractor.kiosk;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.ListInfo;
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
@@ -33,18 +34,17 @@ import org.schabi.newpipe.extractor.utils.ExtractorHelper;
 import java.io.IOException;
 
 public class KioskInfo extends ListInfo<StreamInfoItem> {
-
     private KioskInfo(int serviceId, ListLinkHandler linkHandler, String name) throws ParsingException {
         super(serviceId, linkHandler, name);
     }
 
     public static ListExtractor.InfoItemsPage<StreamInfoItem> getMoreItems(StreamingService service,
                                                                            String url,
-                                                                           String pageUrl)
+                                                                           Page page)
             throws IOException, ExtractionException {
         KioskList kl = service.getKioskList();
-        KioskExtractor extractor = kl.getExtractorByUrl(url, pageUrl);
+        KioskExtractor extractor = kl.getExtractorByUrl(url, page);
-        return extractor.getPage(pageUrl);
+        return extractor.getPage(page);
     }
 
     public static KioskInfo getInfo(String url) throws IOException, ExtractionException {
@@ -71,7 +71,7 @@ public class KioskInfo extends ListInfo<StreamInfoItem> {
 
         final ListExtractor.InfoItemsPage<StreamInfoItem> itemsPage = ExtractorHelper.getItemsPageOrLogError(info, extractor);
         info.setRelatedItems(itemsPage.getItems());
-        info.setNextPageUrl(itemsPage.getNextPageUrl());
+        info.setNextPage(itemsPage.getNextPage());
 
         return info;
     }

extractor/src/main/java/org/schabi/newpipe/extractor/kiosk/KioskList.java

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.extractor.kiosk;
 
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandlerFactory;
@@ -59,23 +60,23 @@ public class KioskList {
 
     public KioskExtractor getDefaultKioskExtractor()
             throws ExtractionException, IOException {
-        return getDefaultKioskExtractor("");
+        return getDefaultKioskExtractor(null);
     }
 
-    public KioskExtractor getDefaultKioskExtractor(String nextPageUrl)
+    public KioskExtractor getDefaultKioskExtractor(Page nextPage)
             throws ExtractionException, IOException {
-        return getDefaultKioskExtractor(nextPageUrl, NewPipe.getPreferredLocalization());
+        return getDefaultKioskExtractor(nextPage, NewPipe.getPreferredLocalization());
     }
 
-    public KioskExtractor getDefaultKioskExtractor(String nextPageUrl, Localization localization)
+    public KioskExtractor getDefaultKioskExtractor(Page nextPage, Localization localization)
             throws ExtractionException, IOException {
         if (defaultKiosk != null && !defaultKiosk.equals("")) {
-            return getExtractorById(defaultKiosk, nextPageUrl, localization);
+            return getExtractorById(defaultKiosk, nextPage, localization);
         } else {
             if (!kioskList.isEmpty()) {
                 // if not set get any entry
                 Object[] keySet = kioskList.keySet().toArray();
-                return getExtractorById(keySet[0].toString(), nextPageUrl, localization);
+                return getExtractorById(keySet[0].toString(), nextPage, localization);
             } else {
                 return null;
             }
@@ -86,12 +87,12 @@ public class KioskList {
         return defaultKiosk;
     }
 
-    public KioskExtractor getExtractorById(String kioskId, String nextPageUrl)
+    public KioskExtractor getExtractorById(String kioskId, Page nextPage)
             throws ExtractionException, IOException {
-        return getExtractorById(kioskId, nextPageUrl, NewPipe.getPreferredLocalization());
+        return getExtractorById(kioskId, nextPage, NewPipe.getPreferredLocalization());
     }
 
-    public KioskExtractor getExtractorById(String kioskId, String nextPageUrl, Localization localization)
+    public KioskExtractor getExtractorById(String kioskId, Page nextPage, Localization localization)
             throws ExtractionException, IOException {
         KioskEntry ke = kioskList.get(kioskId);
         if (ke == null) {
@@ -111,17 +112,17 @@ public class KioskList {
         return kioskList.keySet();
     }
 
-    public KioskExtractor getExtractorByUrl(String url, String nextPageUrl)
+    public KioskExtractor getExtractorByUrl(String url, Page nextPage)
             throws ExtractionException, IOException {
-        return getExtractorByUrl(url, nextPageUrl, NewPipe.getPreferredLocalization());
+        return getExtractorByUrl(url, nextPage, NewPipe.getPreferredLocalization());
     }
 
-    public KioskExtractor getExtractorByUrl(String url, String nextPageUrl, Localization localization)
+    public KioskExtractor getExtractorByUrl(String url, Page nextPage, Localization localization)
             throws ExtractionException, IOException {
         for (Map.Entry<String, KioskEntry> e : kioskList.entrySet()) {
             KioskEntry ke = e.getValue();
             if (ke.handlerFactory.acceptUrl(url)) {
-                return getExtractorById(ke.handlerFactory.getId(url), nextPageUrl, localization);
+                return getExtractorById(ke.handlerFactory.getId(url), nextPage, localization);
             }
         }
         throw new ExtractionException("Could not find a kiosk that fits to the url: " + url);

extractor/src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistInfo.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.extractor.playlist;
 import org.schabi.newpipe.extractor.ListExtractor.InfoItemsPage;
 import org.schabi.newpipe.extractor.ListInfo;
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
@@ -32,8 +33,8 @@ public class PlaylistInfo extends ListInfo<StreamInfoItem> {
 
     public static InfoItemsPage<StreamInfoItem> getMoreItems(StreamingService service,
                                                              String url,
-                                                             String pageUrl) throws IOException, ExtractionException {
+                                                             Page page) throws IOException, ExtractionException {
-        return service.getPlaylistExtractor(url).getPage(pageUrl);
+        return service.getPlaylistExtractor(url).getPage(page);
     }
 
     /**
@@ -112,7 +113,7 @@ public class PlaylistInfo extends ListInfo<StreamInfoItem> {
 
         final InfoItemsPage<StreamInfoItem> itemsPage = ExtractorHelper.getItemsPageOrLogError(info, extractor);
         info.setRelatedItems(itemsPage.getItems());
-        info.setNextPageUrl(itemsPage.getNextPageUrl());
+        info.setNextPage(itemsPage.getNextPage());
 
         return info;
     }

extractor/src/main/java/org/schabi/newpipe/extractor/search/SearchInfo.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.extractor.search;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.ListInfo;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.linkhandler.SearchQueryHandler;
@@ -10,9 +11,7 @@ import org.schabi.newpipe.extractor.utils.ExtractorHelper;
 
 import java.io.IOException;
 
-
 public class SearchInfo extends ListInfo<InfoItem> {
-
     private String searchString;
     private String searchSuggestion;
     private boolean isCorrectedSearch;
@@ -55,7 +54,7 @@ public class SearchInfo extends ListInfo<InfoItem> {
 
         ListExtractor.InfoItemsPage<InfoItem> page = ExtractorHelper.getItemsPageOrLogError(info, extractor);
         info.setRelatedItems(page.getItems());
-        info.setNextPageUrl(page.getNextPageUrl());
+        info.setNextPage(page.getNextPage());
 
         return info;
     }
@@ -63,9 +62,9 @@ public class SearchInfo extends ListInfo<InfoItem> {
 
     public static ListExtractor.InfoItemsPage<InfoItem> getMoreItems(StreamingService service,
                                                                      SearchQueryHandler query,
-                                                                     String pageUrl)
+                                                                     Page page)
             throws IOException, ExtractionException {
-        return service.getSearchExtractor(query).getPage(pageUrl);
+        return service.getSearchExtractor(query).getPage(page);
     }
 
     // Getter

extractor/src/main/java/org/schabi/newpipe/extractor/services/media_ccc/extractors/MediaCCCConferenceExtractor.java

@@ -5,6 +5,7 @@ import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
 import org.schabi.newpipe.extractor.downloader.Downloader;
@@ -79,13 +80,8 @@ public class MediaCCCConferenceExtractor extends ChannelExtractor {
     }
 
     @Override
-    public String getNextPageUrl() {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) {
-        return null;
+        return InfoItemsPage.emptyPage();
-    }
-
-    @Override
-    public InfoItemsPage<StreamInfoItem> getPage(final String pageUrl) {
-        return null;
     }
 
     @Override

extractor/src/main/java/org/schabi/newpipe/extractor/services/media_ccc/extractors/MediaCCCConferenceKiosk.java

@@ -5,6 +5,7 @@ import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItemsCollector;
@@ -37,16 +38,12 @@ public class MediaCCCConferenceKiosk extends KioskExtractor<ChannelInfoItem> {
             collector.commit(new MediaCCCConferenceInfoItemExtractor(conferences.getObject(i)));
         }
 
-        return new InfoItemsPage<>(collector, "");
+        return new InfoItemsPage<>(collector, null);
     }
 
     @Override
-    public String getNextPageUrl() {
-        return "";
-    }
 
-    @Override
+    public InfoItemsPage<ChannelInfoItem> getPage(final Page page) {
-    public InfoItemsPage<ChannelInfoItem> getPage(final String pageUrl) {
         return InfoItemsPage.emptyPage();
     }
 

extractor/src/main/java/org/schabi/newpipe/extractor/services/media_ccc/extractors/MediaCCCSearchExtractor.java

@@ -6,6 +6,7 @@ import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
 
 import org.schabi.newpipe.extractor.InfoItem;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItemExtractor;
@@ -80,12 +81,7 @@ public class MediaCCCSearchExtractor extends SearchExtractor {
     }
 
     @Override
-    public String getNextPageUrl() {
+    public InfoItemsPage<InfoItem> getPage(final Page page) {
-        return "";
-    }
-
-    @Override
-    public InfoItemsPage<InfoItem> getPage(final String pageUrl) {
         return InfoItemsPage.emptyPage();
     }
 

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/PeertubeParsingHelper.java

@@ -1,9 +1,14 @@
 package org.schabi.newpipe.extractor.services.peertube;
 
+import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 
+import org.schabi.newpipe.extractor.InfoItemsCollector;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
+import org.schabi.newpipe.extractor.services.peertube.extractors.PeertubeStreamInfoItemExtractor;
+import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Parser;
 import org.schabi.newpipe.extractor.utils.Utils;
 
@@ -14,7 +19,6 @@ import java.util.Date;
 import java.util.TimeZone;
 
 public class PeertubeParsingHelper {
-
     public static final String START_KEY = "start";
     public static final String COUNT_KEY = "count";
     public static final int ITEMS_PER_PAGE = 12;
@@ -23,17 +27,17 @@ public class PeertubeParsingHelper {
     private PeertubeParsingHelper() {
     }
 
-    public static void validate(JsonObject json) throws ContentNotAvailableException {
+    public static void validate(final JsonObject json) throws ContentNotAvailableException {
-        String error = json.getString("error");
+        final String error = json.getString("error");
         if (!Utils.isBlank(error)) {
             throw new ContentNotAvailableException(error);
         }
     }
 
-    public static Calendar parseDateFrom(String textualUploadDate) throws ParsingException {
+    public static Calendar parseDateFrom(final String textualUploadDate) throws ParsingException {
-        Date date;
+        final Date date;
         try {
-            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.S'Z'");
+            final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.S'Z'");
             sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
             date = sdf.parse(textualUploadDate);
         } catch (ParseException e) {
@@ -45,26 +49,42 @@ public class PeertubeParsingHelper {
         return uploadDate;
     }
 
-    public static String getNextPageUrl(String prevPageUrl, long total) {
+    public static Page getNextPage(final String prevPageUrl, final long total) {
-        String prevStart;
+        final String prevStart;
         try {
             prevStart = Parser.matchGroup1(START_PATTERN, prevPageUrl);
         } catch (Parser.RegexException e) {
-            return "";
+            return null;
         }
-        if (Utils.isBlank(prevStart)) return "";
+        if (Utils.isBlank(prevStart)) return null;
-        long nextStart = 0;
+        final long nextStart;
         try {
             nextStart = Long.parseLong(prevStart) + ITEMS_PER_PAGE;
         } catch (NumberFormatException e) {
-            return "";
+            return null;
         }
 
         if (nextStart >= total) {
-            return "";
+            return null;
         } else {
-            return prevPageUrl.replace(START_KEY + "=" + prevStart, START_KEY + "=" + nextStart);
+            return new Page(prevPageUrl.replace(START_KEY + "=" + prevStart, START_KEY + "=" + nextStart));
         }
     }
 
+    public static void collectStreamsFrom(final InfoItemsCollector collector, final JsonObject json, final String baseUrl) throws ParsingException {
+        final JsonArray contents;
+        try {
+            contents = (JsonArray) JsonUtils.getValue(json, "data");
+        } catch (Exception e) {
+            throw new ParsingException("Unable to extract list info", e);
+        }
+
+        for (final Object c : contents) {
+            if (c instanceof JsonObject) {
+                final JsonObject item = (JsonObject) c;
+                final PeertubeStreamInfoItemExtractor extractor = new PeertubeStreamInfoItemExtractor(item, baseUrl);
+                collector.commit(extractor);
+            }
+        }
+    }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeAccountExtractor.java

@@ -1,10 +1,10 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
-import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
 import org.schabi.newpipe.extractor.downloader.Downloader;
@@ -20,23 +20,23 @@ import org.schabi.newpipe.extractor.utils.Utils;
 
 import java.io.IOException;
 
-import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.*;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.COUNT_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.ITEMS_PER_PAGE;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.START_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.collectStreamsFrom;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class PeertubeAccountExtractor extends ChannelExtractor {
-
-    private InfoItemsPage<StreamInfoItem> initPage;
-    private long total;
-
     private JsonObject json;
     private final String baseUrl;
 
-    public PeertubeAccountExtractor(StreamingService service, ListLinkHandler linkHandler) throws ParsingException {
+    public PeertubeAccountExtractor(final StreamingService service, final ListLinkHandler linkHandler) throws ParsingException {
         super(service, linkHandler);
         this.baseUrl = getBaseUrl();
     }
 
     @Override
-    public String getAvatarUrl() throws ParsingException {
+    public String getAvatarUrl() {
         String value;
         try {
             value = JsonUtils.getString(json, "avatar.path");
@@ -47,7 +47,7 @@ public class PeertubeAccountExtractor extends ChannelExtractor {
     }
 
     @Override
-    public String getBannerUrl() throws ParsingException {
+    public String getBannerUrl() {
         return null;
     }
 
@@ -57,13 +57,12 @@ public class PeertubeAccountExtractor extends ChannelExtractor {
     }
 
     @Override
-    public long getSubscriberCount() throws ParsingException {
+    public long getSubscriberCount() {
-        Number number = JsonUtils.getNumber(json, "followersCount");
+        return json.getLong("followersCount");
-        return number.longValue();
     }
 
     @Override
-    public String getDescription() throws ParsingException {
+    public String getDescription() {
         try {
             return JsonUtils.getString(json, "description");
         } catch (ParsingException e) {
@@ -72,93 +71,73 @@ public class PeertubeAccountExtractor extends ChannelExtractor {
     }
 
     @Override
-    public String getParentChannelName() throws ParsingException {
+    public String getParentChannelName() {
         return "";
     }
 
     @Override
-    public String getParentChannelUrl() throws ParsingException {
+    public String getParentChannelUrl() {
         return "";
     }
 
     @Override
-    public String getParentChannelAvatarUrl() throws ParsingException {
+    public String getParentChannelAvatarUrl() {
         return "";
     }
 
     @Override
     public InfoItemsPage<StreamInfoItem> getInitialPage() throws IOException, ExtractionException {
-        super.fetchPage();
+        final String pageUrl = getUrl() + "/videos?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE;
-        return initPage;
+        return getPage(new Page(pageUrl));
-    }
-
-    private void collectStreamsFrom(StreamInfoItemsCollector collector, JsonObject json, String pageUrl) throws ParsingException {
-        JsonArray contents;
-        try {
-            contents = (JsonArray) JsonUtils.getValue(json, "data");
-        } catch (Exception e) {
-            throw new ParsingException("unable to extract channel streams", e);
-        }
-
-        for (Object c : contents) {
-            if (c instanceof JsonObject) {
-                final JsonObject item = (JsonObject) c;
-                PeertubeStreamInfoItemExtractor extractor = new PeertubeStreamInfoItemExtractor(item, baseUrl);
-                collector.commit(extractor);
-            }
-        }
-
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        super.fetchPage();
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-        return initPage.getNextPageUrl();
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-    @Override
+        final Response response = getDownloader().get(page.getUrl());
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+
-        Response response = getDownloader().get(pageUrl);
         JsonObject json = null;
         if (response != null && !Utils.isBlank(response.responseBody())) {
             try {
                 json = JsonParser.object().from(response.responseBody());
             } catch (Exception e) {
-                throw new ParsingException("Could not parse json data for kiosk info", e);
+                throw new ParsingException("Could not parse json data for account info", e);
             }
         }
 
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
         if (json != null) {
             PeertubeParsingHelper.validate(json);
-            total = JsonUtils.getNumber(json, "total").longValue();
+            final long total = json.getLong("total");
-            collectStreamsFrom(collector, json, pageUrl);
+
+            final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+            collectStreamsFrom(collector, json, getBaseUrl());
+
+            return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPage(page.getUrl(), total));
         } else {
-            throw new ExtractionException("Unable to get PeerTube kiosk info");
+            throw new ExtractionException("Unable to get PeerTube account info");
         }
-        return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPageUrl(pageUrl, total));
     }
 
     @Override
-    public void onFetchPage(Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(final Downloader downloader) throws IOException, ExtractionException {
-        Response response = downloader.get(getUrl());
+        final Response response = downloader.get(getUrl());
-        if (null != response && null != response.responseBody()) {
+        if (response != null && response.responseBody() != null) {
             setInitialData(response.responseBody());
         } else {
-            throw new ExtractionException("Unable to extract PeerTube channel data");
+            throw new ExtractionException("Unable to extract PeerTube account data");
+        }
     }
 
-        String pageUrl = getUrl() + "/videos?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE;
+    private void setInitialData(final String responseBody) throws ExtractionException {
-        this.initPage = getPage(pageUrl);
-    }
-
-    private void setInitialData(String responseBody) throws ExtractionException {
         try {
             json = JsonParser.object().from(responseBody);
         } catch (JsonParserException e) {
-            throw new ExtractionException("Unable to extract PeerTube channel data", e);
+            throw new ExtractionException("Unable to extract PeerTube account data", e);
         }
-        if (json == null) throw new ExtractionException("Unable to extract PeerTube channel data");
+        if (json == null) throw new ExtractionException("Unable to extract PeerTube account data");
     }
 
     @Override
@@ -170,5 +149,4 @@ public class PeertubeAccountExtractor extends ChannelExtractor {
     public String getOriginalUrl() throws ParsingException {
         return baseUrl + "/" + getId();
     }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeChannelExtractor.java

@@ -1,10 +1,10 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
-import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
 import org.schabi.newpipe.extractor.downloader.Downloader;
@@ -16,29 +16,28 @@ import org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 import org.schabi.newpipe.extractor.utils.JsonUtils;
-import org.schabi.newpipe.extractor.utils.Parser;
-import org.schabi.newpipe.extractor.utils.Parser.RegexException;
 import org.schabi.newpipe.extractor.utils.Utils;
 
 import java.io.IOException;
 
-import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.*;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.COUNT_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.ITEMS_PER_PAGE;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.START_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.collectStreamsFrom;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+
 
 public class PeertubeChannelExtractor extends ChannelExtractor {
-
-    private InfoItemsPage<StreamInfoItem> initPage;
-    private long total;
-
     private JsonObject json;
     private final String baseUrl;
 
-    public PeertubeChannelExtractor(StreamingService service, ListLinkHandler linkHandler) throws ParsingException {
+    public PeertubeChannelExtractor(final StreamingService service, final ListLinkHandler linkHandler) throws ParsingException {
         super(service, linkHandler);
         this.baseUrl = getBaseUrl();
     }
 
     @Override
-    public String getAvatarUrl() throws ParsingException {
+    public String getAvatarUrl() {
         String value;
         try {
             value = JsonUtils.getString(json, "avatar.path");
@@ -49,7 +48,7 @@ public class PeertubeChannelExtractor extends ChannelExtractor {
     }
 
     @Override
-    public String getBannerUrl() throws ParsingException {
+    public String getBannerUrl() {
         return null;
     }
 
@@ -59,13 +58,12 @@ public class PeertubeChannelExtractor extends ChannelExtractor {
     }
 
     @Override
-    public long getSubscriberCount() throws ParsingException {
+    public long getSubscriberCount() {
-        Number number = JsonUtils.getNumber(json, "followersCount");
+        return json.getLong("followersCount");
-        return number.longValue();
     }
 
     @Override
-    public String getDescription() throws ParsingException {
+    public String getDescription() {
         try {
             return JsonUtils.getString(json, "description");
         } catch (ParsingException e) {
@@ -84,7 +82,7 @@ public class PeertubeChannelExtractor extends ChannelExtractor {
     }
 
     @Override
-    public String getParentChannelAvatarUrl() throws ParsingException {
+    public String getParentChannelAvatarUrl() {
         String value;
         try {
             value = JsonUtils.getString(json, "ownerAccount.avatar.path");
@@ -96,74 +94,55 @@ public class PeertubeChannelExtractor extends ChannelExtractor {
 
     @Override
     public InfoItemsPage<StreamInfoItem> getInitialPage() throws IOException, ExtractionException {
-        super.fetchPage();
+        final String pageUrl = getUrl() + "/videos?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE;
-        return initPage;
+        return getPage(new Page(pageUrl));
-    }
-
-    private void collectStreamsFrom(StreamInfoItemsCollector collector, JsonObject json, String pageUrl) throws ParsingException {
-        JsonArray contents;
-        try {
-            contents = (JsonArray) JsonUtils.getValue(json, "data");
-        } catch (Exception e) {
-            throw new ParsingException("unable to extract channel streams", e);
-        }
-
-        for (Object c : contents) {
-            if (c instanceof JsonObject) {
-                final JsonObject item = (JsonObject) c;
-                PeertubeStreamInfoItemExtractor extractor = new PeertubeStreamInfoItemExtractor(item, baseUrl);
-                collector.commit(extractor);
-            }
-        }
-
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        super.fetchPage();
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-        return initPage.getNextPageUrl();
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-    @Override
+        final Response response = getDownloader().get(page.getUrl());
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+
-        Response response = getDownloader().get(pageUrl);
         JsonObject json = null;
         if (response != null && !Utils.isBlank(response.responseBody())) {
             try {
                 json = JsonParser.object().from(response.responseBody());
             } catch (Exception e) {
-                throw new ParsingException("Could not parse json data for kiosk info", e);
+                throw new ParsingException("Could not parse json data for channel info", e);
             }
         }
 
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
         if (json != null) {
             PeertubeParsingHelper.validate(json);
-            this.total = JsonUtils.getNumber(json, "total").longValue();
+            final long total = json.getLong("total");
-            collectStreamsFrom(collector, json, pageUrl);
+
+            final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+            collectStreamsFrom(collector, json, getBaseUrl());
+
+            return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPage(page.getUrl(), total));
         } else {
-            throw new ExtractionException("Unable to get PeerTube kiosk info");
+            throw new ExtractionException("Unable to get PeerTube channel info");
         }
-        return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPageUrl(pageUrl, total));
     }
 
     @Override
-    public void onFetchPage(Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(final Downloader downloader) throws IOException, ExtractionException {
-        Response response = downloader.get(getUrl());
+        final Response response = downloader.get(getUrl());
-        if (null != response && null != response.responseBody()) {
+        if (response != null && response.responseBody() != null) {
             setInitialData(response.responseBody());
         } else {
             throw new ExtractionException("Unable to extract PeerTube channel data");
         }
-
-        this.initPage = getPage(getUrl() + "/videos?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE);
     }
 
-    private void setInitialData(String responseBody) throws ExtractionException {
+    private void setInitialData(final String responseBody) throws ExtractionException {
         try {
             json = JsonParser.object().from(responseBody);
         } catch (JsonParserException e) {
-            throw new ExtractionException("Unable to extract peertube channel data", e);
+            throw new ExtractionException("Unable to extract PeerTube channel data", e);
         }
         if (json == null) throw new ExtractionException("Unable to extract PeerTube channel data");
     }
@@ -177,5 +156,4 @@ public class PeertubeChannelExtractor extends ChannelExtractor {
     public String getOriginalUrl() throws ParsingException {
         return baseUrl + "/" + getId();
     }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeCommentsExtractor.java

@@ -4,6 +4,7 @@ import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.comments.CommentsExtractor;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
@@ -22,19 +23,17 @@ import java.io.IOException;
 import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.COUNT_KEY;
 import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.ITEMS_PER_PAGE;
 import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.START_KEY;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class PeertubeCommentsExtractor extends CommentsExtractor {
-    private InfoItemsPage<CommentsInfoItem> initPage;
-    private long total;
-
     public PeertubeCommentsExtractor(final StreamingService service, final ListLinkHandler uiHandler) {
         super(service, uiHandler);
     }
 
     @Override
     public InfoItemsPage<CommentsInfoItem> getInitialPage() throws IOException, ExtractionException {
-        super.fetchPage();
+        final String pageUrl = getUrl() + "?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE;
-        return initPage;
+        return getPage(new Page(pageUrl));
     }
 
     private void collectCommentsFrom(final CommentsInfoItemsCollector collector, final JsonObject json) throws ParsingException {
@@ -52,14 +51,13 @@ public class PeertubeCommentsExtractor extends CommentsExtractor {
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<CommentsInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        super.fetchPage();
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-        return initPage.getNextPageUrl();
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-    @Override
+        final Response response = getDownloader().get(page.getUrl());
-    public InfoItemsPage<CommentsInfoItem> getPage(final String pageUrl) throws IOException, ExtractionException {
+
-        final Response response = getDownloader().get(pageUrl);
         JsonObject json = null;
         if (response != null && !Utils.isBlank(response.responseBody())) {
             try {
@@ -69,19 +67,19 @@ public class PeertubeCommentsExtractor extends CommentsExtractor {
             }
         }
 
-        final CommentsInfoItemsCollector collector = new CommentsInfoItemsCollector(getServiceId());
         if (json != null) {
-            final Number number = JsonUtils.getNumber(json, "total");
+            PeertubeParsingHelper.validate(json);
-            if (number != null) this.total = number.longValue();
+            final long total = json.getLong("total");
+
+            final CommentsInfoItemsCollector collector = new CommentsInfoItemsCollector(getServiceId());
             collectCommentsFrom(collector, json);
+
+            return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPage(page.getUrl(), total));
         } else {
-            throw new ExtractionException("Unable to get peertube comments info");
+            throw new ExtractionException("Unable to get PeerTube kiosk info");
         }
-        return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPageUrl(pageUrl, total));
     }
 
     @Override
-    public void onFetchPage(Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(Downloader downloader) { }
-        this.initPage = getPage(getUrl() + "?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE);
-    }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeCommentsInfoItemExtractor.java

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
 import com.grack.nanojson.JsonObject;
+
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
 import org.schabi.newpipe.extractor.ServiceList;
@@ -10,14 +11,14 @@ import org.schabi.newpipe.extractor.localization.DateWrapper;
 import org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper;
 import org.schabi.newpipe.extractor.utils.JsonUtils;
 
+import java.util.Objects;
 
 public class PeertubeCommentsInfoItemExtractor implements CommentsInfoItemExtractor {
-
     private final JsonObject item;
     private final String url;
     private final String baseUrl;
 
-    public PeertubeCommentsInfoItemExtractor(JsonObject item, PeertubeCommentsExtractor extractor) throws ParsingException {
+    public PeertubeCommentsInfoItemExtractor(final JsonObject item, final PeertubeCommentsExtractor extractor) throws ParsingException {
         this.item = item;
         this.url = extractor.getUrl();
         this.baseUrl = extractor.getBaseUrl();
@@ -29,7 +30,7 @@ public class PeertubeCommentsInfoItemExtractor implements CommentsInfoItemExtrac
     }
 
     @Override
-    public String getThumbnailUrl() throws ParsingException {
+    public String getThumbnailUrl() {
         String value;
         try {
             value = JsonUtils.getString(item, "account.avatar.path");
@@ -51,20 +52,20 @@ public class PeertubeCommentsInfoItemExtractor implements CommentsInfoItemExtrac
 
     @Override
     public DateWrapper getUploadDate() throws ParsingException {
-        String textualUploadDate = getTextualUploadDate();
+        final String textualUploadDate = getTextualUploadDate();
         return new DateWrapper(PeertubeParsingHelper.parseDateFrom(textualUploadDate));
     }
 
     @Override
-    public int getLikeCount() throws ParsingException {
+    public int getLikeCount() {
         return -1;
     }
 
     @Override
     public String getCommentText() throws ParsingException {
-        String htmlText = JsonUtils.getString(item, "text");
+        final String htmlText = JsonUtils.getString(item, "text");
         try {
-            Document doc = Jsoup.parse(htmlText);
+            final Document doc = Jsoup.parse(htmlText);
             return doc.body().text();
         } catch (Exception e) {
             return htmlText.replaceAll("(?s)<[^>]*>(\\s*<[^>]*>)*", "");
@@ -72,13 +73,12 @@ public class PeertubeCommentsInfoItemExtractor implements CommentsInfoItemExtrac
     }
 
     @Override
-    public String getCommentId() throws ParsingException {
+    public String getCommentId() {
-        Number value = JsonUtils.getNumber(item, "id");
+        return Objects.toString(item.getLong("id"), null);
-        return value.toString();
     }
 
     @Override
-    public String getUploaderAvatarUrl() throws ParsingException {
+    public String getUploaderAvatarUrl() {
         String value;
         try {
             value = JsonUtils.getString(item, "account.avatar.path");
@@ -95,9 +95,8 @@ public class PeertubeCommentsInfoItemExtractor implements CommentsInfoItemExtrac
 
     @Override
     public String getUploaderUrl() throws ParsingException {
-        String name = JsonUtils.getString(item, "account.name");
+        final String name = JsonUtils.getString(item, "account.name");
-        String host = JsonUtils.getString(item, "account.host");
+        final String host = JsonUtils.getString(item, "account.host");
         return ServiceList.PeerTube.getChannelLHFactory().fromId("accounts/" + name + "@" + host, baseUrl).getUrl();
     }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubePlaylistExtractor.java

@@ -1,9 +1,10 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
-import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
+
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.downloader.Response;
@@ -14,22 +15,22 @@ import org.schabi.newpipe.extractor.playlist.PlaylistExtractor;
 import org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
-import org.schabi.newpipe.extractor.utils.JsonUtils;
+import org.schabi.newpipe.extractor.utils.Utils;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 
-import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.*;
+import javax.annotation.Nonnull;
+
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.COUNT_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.ITEMS_PER_PAGE;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.START_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.collectStreamsFrom;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class PeertubePlaylistExtractor extends PlaylistExtractor {
-
     private JsonObject playlistInfo;
-    private JsonObject playlistVideos;
-    private String initialPageUrl;
 
-    private long total;
+    public PeertubePlaylistExtractor(final StreamingService service, final ListLinkHandler linkHandler) {
-
-    public PeertubePlaylistExtractor(StreamingService service, ListLinkHandler linkHandler) {
         super(service, linkHandler);
     }
 
@@ -39,17 +40,17 @@ public class PeertubePlaylistExtractor extends PlaylistExtractor {
     }
 
     @Override
-    public String getBannerUrl() throws ParsingException {
+    public String getBannerUrl() {
         return null;
     }
 
     @Override
-    public String getUploaderUrl() throws ParsingException {
+    public String getUploaderUrl() {
         return playlistInfo.getObject("ownerAccount").getString("url");
     }
 
     @Override
-    public String getUploaderName() throws ParsingException {
+    public String getUploaderName() {
         return playlistInfo.getObject("ownerAccount").getString("displayName");
     }
 
@@ -59,19 +60,19 @@ public class PeertubePlaylistExtractor extends PlaylistExtractor {
     }
 
     @Override
-    public long getStreamCount() throws ParsingException {
+    public long getStreamCount() {
-        return playlistInfo.getNumber("videosLength").longValue();
+        return playlistInfo.getLong("videosLength");
     }
 
     @Nonnull
     @Override
-    public String getSubChannelName() throws ParsingException {
+    public String getSubChannelName() {
         return playlistInfo.getObject("videoChannel").getString("displayName");
     }
 
     @Nonnull
     @Override
-    public String getSubChannelUrl() throws ParsingException {
+    public String getSubChannelUrl() {
         return playlistInfo.getObject("videoChannel").getString("url");
     }
 
@@ -84,47 +85,48 @@ public class PeertubePlaylistExtractor extends PlaylistExtractor {
     @Nonnull
     @Override
     public InfoItemsPage<StreamInfoItem> getInitialPage() throws IOException, ExtractionException {
-        return getPage(initialPageUrl);
+        return getPage(new Page(getUrl() + "/videos?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE));
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        return PeertubeParsingHelper.getNextPageUrl(initialPageUrl, total);
+        if (page == null || isNullOrEmpty(page.getUrl())) {
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-    @Override
+        final Response response = getDownloader().get(page.getUrl());
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+
-        Response response = getDownloader().get(pageUrl);
+        JsonObject json = null;
+        if (response != null && !Utils.isBlank(response.responseBody())) {
             try {
-            playlistVideos = JsonParser.object().from(response.responseBody());
+                json = JsonParser.object().from(response.responseBody());
-        } catch (JsonParserException jpe) {
+            } catch (Exception e) {
-            throw new ExtractionException("Could not parse json", jpe);
+                throw new ParsingException("Could not parse json data for playlist info", e);
             }
-        PeertubeParsingHelper.validate(playlistVideos);
-
-        this.total = JsonUtils.getNumber(playlistVideos, "total").longValue();
-
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
-
-        JsonArray videos = playlistVideos.getArray("data");
-        for (Object o : videos) {
-            JsonObject video = ((JsonObject) o).getObject("video");
-            collector.commit(new PeertubeStreamInfoItemExtractor(video, getBaseUrl()));
         }
 
-        return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPageUrl(pageUrl, total));
+        if (json != null) {
+            PeertubeParsingHelper.validate(json);
+            final long total = json.getLong("total");
+
+            final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+            collectStreamsFrom(collector, json, getBaseUrl());
+
+            return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPage(page.getUrl(), total));
+        } else {
+            throw new ExtractionException("Unable to get PeerTube playlist info");
+        }
     }
 
     @Override
-    public void onFetchPage(@Nonnull Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(@Nonnull final Downloader downloader) throws IOException, ExtractionException {
-        Response response = downloader.get(getUrl());
+        final Response response = downloader.get(getUrl());
         try {
             playlistInfo = JsonParser.object().from(response.responseBody());
         } catch (JsonParserException jpe) {
             throw new ExtractionException("Could not parse json", jpe);
         }
         PeertubeParsingHelper.validate(playlistInfo);
-        initialPageUrl = getUrl() + "/videos?" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE;
     }
 
     @Nonnull

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeSearchExtractor.java

@@ -1,12 +1,10 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
-import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 
 import org.schabi.newpipe.extractor.InfoItem;
-import org.schabi.newpipe.extractor.InfoItemExtractor;
+import org.schabi.newpipe.extractor.Page;
-import org.schabi.newpipe.extractor.InfoItemsCollector;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.downloader.Response;
@@ -16,28 +14,26 @@ import org.schabi.newpipe.extractor.linkhandler.SearchQueryHandler;
 import org.schabi.newpipe.extractor.search.InfoItemsSearchCollector;
 import org.schabi.newpipe.extractor.search.SearchExtractor;
 import org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper;
-import org.schabi.newpipe.extractor.utils.JsonUtils;
-import org.schabi.newpipe.extractor.utils.Parser;
-import org.schabi.newpipe.extractor.utils.Parser.RegexException;
 import org.schabi.newpipe.extractor.utils.Utils;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 
-import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.*;
+import javax.annotation.Nonnull;
+
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.COUNT_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.ITEMS_PER_PAGE;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.START_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.collectStreamsFrom;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class PeertubeSearchExtractor extends SearchExtractor {
-
-    private InfoItemsPage<InfoItem> initPage;
-    private long total;
-
     public PeertubeSearchExtractor(StreamingService service, SearchQueryHandler linkHandler) {
         super(service, linkHandler);
     }
 
     @Nonnull
     @Override
-    public String getSearchSuggestion() throws ParsingException {
+    public String getSearchSuggestion() {
         return "";
     }
 
@@ -48,44 +44,20 @@ public class PeertubeSearchExtractor extends SearchExtractor {
 
     @Override
     public InfoItemsPage<InfoItem> getInitialPage() throws IOException, ExtractionException {
-        super.fetchPage();
+        final String pageUrl = getUrl() + "&" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE;
-        return initPage;
+        return getPage(new Page(pageUrl));
-    }
-
-    private InfoItemsCollector<InfoItem, InfoItemExtractor> collectStreamsFrom(JsonObject json) throws ParsingException {
-        final InfoItemsSearchCollector collector = new InfoItemsSearchCollector(getServiceId());
-
-        JsonArray contents;
-        try {
-            contents = (JsonArray) JsonUtils.getValue(json, "data");
-        } catch (Exception e) {
-            throw new ParsingException("unable to extract search info", e);
-        }
-
-        String baseUrl = getBaseUrl();
-        for (Object c : contents) {
-            if (c instanceof JsonObject) {
-                final JsonObject item = (JsonObject) c;
-                PeertubeStreamInfoItemExtractor extractor = new PeertubeStreamInfoItemExtractor(item, baseUrl);
-                collector.commit(extractor);
-            }
-        }
-
-        return collector;
-
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<InfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        super.fetchPage();
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-        return initPage.getNextPageUrl();
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-    @Override
+        final Response response = getDownloader().get(page.getUrl());
-    public InfoItemsPage<InfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+
-        Response response = getDownloader().get(pageUrl);
         JsonObject json = null;
-        if (null != response && !Utils.isBlank(response.responseBody())) {
+        if (response != null && !Utils.isBlank(response.responseBody())) {
             try {
                 json = JsonParser.object().from(response.responseBody());
             } catch (Exception e) {
@@ -94,15 +66,18 @@ public class PeertubeSearchExtractor extends SearchExtractor {
         }
 
         if (json != null) {
-            total = JsonUtils.getNumber(json, "total").longValue();
+            PeertubeParsingHelper.validate(json);
-            return new InfoItemsPage<>(collectStreamsFrom(json), PeertubeParsingHelper.getNextPageUrl(pageUrl, total));
+            final long total = json.getLong("total");
+
+            final InfoItemsSearchCollector collector = new InfoItemsSearchCollector(getServiceId());
+            collectStreamsFrom(collector, json, getBaseUrl());
+
+            return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPage(page.getUrl(), total));
         } else {
-            throw new ExtractionException("Unable to get peertube search info");
+            throw new ExtractionException("Unable to get PeerTube search info");
         }
     }
 
     @Override
-    public void onFetchPage(Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(@Nonnull final Downloader downloader) throws IOException, ExtractionException { }
-        initPage = getPage(getUrl() + "&" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE);
-    }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeStreamExtractor.java

@@ -40,13 +40,11 @@ import java.util.Locale;
 import javax.annotation.Nonnull;
 
 public class PeertubeStreamExtractor extends StreamExtractor {
-
-
     private final String baseUrl;
     private JsonObject json;
     private List<SubtitlesStream> subtitles = new ArrayList<>();
 
-    public PeertubeStreamExtractor(StreamingService service, LinkHandler linkHandler) throws ParsingException {
+    public PeertubeStreamExtractor(final StreamingService service, final LinkHandler linkHandler) throws ParsingException {
         super(service, linkHandler);
         this.baseUrl = getBaseUrl();
     }
@@ -82,10 +80,10 @@ public class PeertubeStreamExtractor extends StreamExtractor {
         }
         if (text.length() == 250 && text.substring(247).equals("...")) {
             //if description is shortened, get full description
-            Downloader dl = NewPipe.getDownloader();
+            final Downloader dl = NewPipe.getDownloader();
             try {
-                Response response = dl.get(getUrl() + "/description");
+                final Response response = dl.get(getUrl() + "/description");
-                JsonObject jsonObject = JsonParser.object().from(response.responseBody());
+                final JsonObject jsonObject = JsonParser.object().from(response.responseBody());
                 text = JsonUtils.getString(jsonObject, "description");
             } catch (ReCaptchaException | IOException | JsonParserException e) {
                 e.printStackTrace();
@@ -96,7 +94,7 @@ public class PeertubeStreamExtractor extends StreamExtractor {
 
     @Override
     public int getAgeLimit() throws ParsingException {
-        boolean isNSFW = JsonUtils.getBoolean(json, "nsfw");
+        final boolean isNSFW = JsonUtils.getBoolean(json, "nsfw");
         if (isNSFW) {
             return 18;
         } else {
@@ -105,39 +103,35 @@ public class PeertubeStreamExtractor extends StreamExtractor {
     }
 
     @Override
-    public long getLength() throws ParsingException {
+    public long getLength() {
-        Number value = JsonUtils.getNumber(json, "duration");
+        return json.getLong("duration");
-        return value.longValue();
     }
 
     @Override
-    public long getTimeStamp() throws ParsingException {
+    public long getTimeStamp() {
         //TODO fetch timestamp from url if present;
         return 0;
     }
 
     @Override
-    public long getViewCount() throws ParsingException {
+    public long getViewCount() {
-        Number value = JsonUtils.getNumber(json, "views");
+        return json.getLong("views");
-        return value.longValue();
     }
 
     @Override
-    public long getLikeCount() throws ParsingException {
+    public long getLikeCount() {
-        Number value = JsonUtils.getNumber(json, "likes");
+        return json.getLong("likes");
-        return value.longValue();
     }
 
     @Override
-    public long getDislikeCount() throws ParsingException {
+    public long getDislikeCount() {
-        Number value = JsonUtils.getNumber(json, "dislikes");
+        return json.getLong("dislikes");
-        return value.longValue();
     }
 
     @Override
     public String getUploaderUrl() throws ParsingException {
-        String name = JsonUtils.getString(json, "account.name");
+        final String name = JsonUtils.getString(json, "account.name");
-        String host = JsonUtils.getString(json, "account.host");
+        final String host = JsonUtils.getString(json, "account.host");
         return getService().getChannelLHFactory().fromId("accounts/" + name + "@" + host, baseUrl).getUrl();
     }
 
@@ -147,7 +141,7 @@ public class PeertubeStreamExtractor extends StreamExtractor {
     }
 
     @Override
-    public String getUploaderAvatarUrl() throws ParsingException {
+    public String getUploaderAvatarUrl() {
         String value;
         try {
             value = JsonUtils.getString(json, "account.avatar.path");
@@ -170,7 +164,7 @@ public class PeertubeStreamExtractor extends StreamExtractor {
 
     @Nonnull
     @Override
-    public String getSubChannelAvatarUrl() throws ParsingException {
+    public String getSubChannelAvatarUrl() {
         String value;
         try {
             value = JsonUtils.getString(json, "channel.avatar.path");
@@ -181,35 +175,35 @@ public class PeertubeStreamExtractor extends StreamExtractor {
     }
 
     @Override
-    public String getDashMpdUrl() throws ParsingException {
+    public String getDashMpdUrl() {
         return "";
     }
 
     @Override
-    public String getHlsUrl() throws ParsingException {
+    public String getHlsUrl() {
         return "";
     }
 
     @Override
-    public List<AudioStream> getAudioStreams() throws IOException, ExtractionException {
+    public List<AudioStream> getAudioStreams() {
         return null;
     }
 
     @Override
-    public List<VideoStream> getVideoStreams() throws IOException, ExtractionException {
+    public List<VideoStream> getVideoStreams() throws ExtractionException {
         assertPageFetched();
-        List<VideoStream> videoStreams = new ArrayList<>();
+        final List<VideoStream> videoStreams = new ArrayList<>();
         try {
-            JsonArray streams = json.getArray("files");
+            final JsonArray streams = json.getArray("files");
-            for (Object s : streams) {
+            for (final Object s : streams) {
                 if (!(s instanceof JsonObject)) continue;
-                JsonObject stream = (JsonObject) s;
+                final JsonObject stream = (JsonObject) s;
-                String url = JsonUtils.getString(stream, "fileUrl");
+                final String url = JsonUtils.getString(stream, "fileUrl");
-                String torrentUrl = JsonUtils.getString(stream, "torrentUrl");
+                final String torrentUrl = JsonUtils.getString(stream, "torrentUrl");
-                String resolution = JsonUtils.getString(stream, "resolution.label");
+                final String resolution = JsonUtils.getString(stream, "resolution.label");
-                String extension = url.substring(url.lastIndexOf(".") + 1);
+                final String extension = url.substring(url.lastIndexOf(".") + 1);
-                MediaFormat format = MediaFormat.getFromSuffix(extension);
+                final MediaFormat format = MediaFormat.getFromSuffix(extension);
-                VideoStream videoStream = new VideoStream(url, torrentUrl, format, resolution);
+                final VideoStream videoStream = new VideoStream(url, torrentUrl, format, resolution);
                 if (!Stream.containSimilarStream(videoStream, videoStreams)) {
                     videoStreams.add(videoStream);
                 }
@@ -223,20 +217,19 @@ public class PeertubeStreamExtractor extends StreamExtractor {
 
 
     @Override
-    public List<VideoStream> getVideoOnlyStreams() throws IOException, ExtractionException {
+    public List<VideoStream> getVideoOnlyStreams() {
-        // TODO Auto-generated method stub
+        return Collections.emptyList();
-        return null;
     }
 
     @Override
-    public List<SubtitlesStream> getSubtitlesDefault() throws IOException, ExtractionException {
+    public List<SubtitlesStream> getSubtitlesDefault() {
         return subtitles;
     }
 
     @Override
-    public List<SubtitlesStream> getSubtitles(final MediaFormat format) throws IOException, ExtractionException {
+    public List<SubtitlesStream> getSubtitles(final MediaFormat format) {
-        List<SubtitlesStream> filteredSubs = new ArrayList<>();
+        final List<SubtitlesStream> filteredSubs = new ArrayList<>();
-        for (SubtitlesStream sub : subtitles) {
+        for (final SubtitlesStream sub : subtitles) {
             if (sub.getFormat() == format) {
                 filteredSubs.add(sub);
             }
@@ -245,20 +238,20 @@ public class PeertubeStreamExtractor extends StreamExtractor {
     }
 
     @Override
-    public StreamType getStreamType() throws ParsingException {
+    public StreamType getStreamType() {
         return StreamType.VIDEO_STREAM;
     }
 
     @Override
-    public StreamInfoItem getNextStream() throws IOException, ExtractionException {
+    public StreamInfoItem getNextStream() {
         return null;
     }
 
     @Override
     public StreamInfoItemsCollector getRelatedStreams() throws IOException, ExtractionException {
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+        final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
-        List<String> tags = getTags();
+        final List<String> tags = getTags();
-        String apiUrl = null;
+        final String apiUrl;
         if (!tags.isEmpty()) {
             apiUrl = getRelatedStreamsUrl(tags);
 
@@ -280,7 +273,7 @@ public class PeertubeStreamExtractor extends StreamExtractor {
 
     @Nonnull
     @Override
-    public String getSupportInfo() throws ParsingException {
+    public String getSupportInfo() {
         try {
             return JsonUtils.getString(json, "support");
         } catch (ParsingException e) {
@@ -288,21 +281,21 @@ public class PeertubeStreamExtractor extends StreamExtractor {
         }
     }
 
-    private String getRelatedStreamsUrl(List<String> tags) throws UnsupportedEncodingException {
+    private String getRelatedStreamsUrl(final List<String> tags) throws UnsupportedEncodingException {
-        String url = baseUrl + PeertubeSearchQueryHandlerFactory.SEARCH_ENDPOINT;
+        final String url = baseUrl + PeertubeSearchQueryHandlerFactory.SEARCH_ENDPOINT;
-        StringBuilder params = new StringBuilder();
+        final StringBuilder params = new StringBuilder();
         params.append("start=0&count=8&sort=-createdAt");
-        for (String tag : tags) {
+        for (final String tag : tags) {
             params.append("&tagsOneOf=");
             params.append(URLEncoder.encode(tag, "UTF-8"));
         }
         return url + "?" + params.toString();
     }
 
-    private void getStreamsFromApi(StreamInfoItemsCollector collector, String apiUrl) throws ReCaptchaException, IOException, ParsingException {
+    private void getStreamsFromApi(final StreamInfoItemsCollector collector, final String apiUrl) throws ReCaptchaException, IOException, ParsingException {
-        Response response = getDownloader().get(apiUrl);
+        final Response response = getDownloader().get(apiUrl);
         JsonObject relatedVideosJson = null;
-        if (null != response && !Utils.isBlank(response.responseBody())) {
+        if (response != null && !Utils.isBlank(response.responseBody())) {
             try {
                 relatedVideosJson = JsonParser.object().from(response.responseBody());
             } catch (JsonParserException e) {
@@ -315,66 +308,64 @@ public class PeertubeStreamExtractor extends StreamExtractor {
         }
     }
 
-    private void collectStreamsFrom(StreamInfoItemsCollector collector, JsonObject json) throws ParsingException {
+    private void collectStreamsFrom(final StreamInfoItemsCollector collector, final JsonObject json) throws ParsingException {
-        JsonArray contents;
+        final JsonArray contents;
         try {
             contents = (JsonArray) JsonUtils.getValue(json, "data");
         } catch (Exception e) {
             throw new ParsingException("unable to extract related videos", e);
         }
 
-        for (Object c : contents) {
+        for (final Object c : contents) {
             if (c instanceof JsonObject) {
                 final JsonObject item = (JsonObject) c;
-                PeertubeStreamInfoItemExtractor extractor = new PeertubeStreamInfoItemExtractor(item, baseUrl);
+                final PeertubeStreamInfoItemExtractor extractor = new PeertubeStreamInfoItemExtractor(item, baseUrl);
                 //do not add the same stream in related streams
                 if (!extractor.getUrl().equals(getUrl())) collector.commit(extractor);
             }
         }
-
     }
 
-
     @Override
     public String getErrorMessage() {
         return null;
     }
 
     @Override
-    public void onFetchPage(Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(final Downloader downloader) throws IOException, ExtractionException {
-        Response response = downloader.get(getUrl());
+        final Response response = downloader.get(getUrl());
-        if (null != response && null != response.responseBody()) {
+        if (response != null && response.responseBody() != null) {
             setInitialData(response.responseBody());
         } else {
-            throw new ExtractionException("Unable to extract peertube channel data");
+            throw new ExtractionException("Unable to extract PeerTube channel data");
         }
 
         loadSubtitles();
     }
 
-    private void setInitialData(String responseBody) throws ExtractionException {
+    private void setInitialData(final String responseBody) throws ExtractionException {
         try {
             json = JsonParser.object().from(responseBody);
         } catch (JsonParserException e) {
-            throw new ExtractionException("Unable to extract peertube stream data", e);
+            throw new ExtractionException("Unable to extract PeerTube stream data", e);
         }
-        if (null == json) throw new ExtractionException("Unable to extract peertube stream data");
+        if (json == null) throw new ExtractionException("Unable to extract PeerTube stream data");
         PeertubeParsingHelper.validate(json);
     }
 
     private void loadSubtitles() {
         if (subtitles.isEmpty()) {
             try {
-                Response response = getDownloader().get(getUrl() + "/captions");
+                final Response response = getDownloader().get(getUrl() + "/captions");
-                JsonObject captionsJson = JsonParser.object().from(response.responseBody());
+                final JsonObject captionsJson = JsonParser.object().from(response.responseBody());
-                JsonArray captions = JsonUtils.getArray(captionsJson, "data");
+                final JsonArray captions = JsonUtils.getArray(captionsJson, "data");
-                for (Object c : captions) {
+                for (final Object c : captions) {
                     if (c instanceof JsonObject) {
-                        JsonObject caption = (JsonObject) c;
+                        final JsonObject caption = (JsonObject) c;
-                        String url = baseUrl + JsonUtils.getString(caption, "captionPath");
+                        final String url = baseUrl + JsonUtils.getString(caption, "captionPath");
-                        String languageCode = JsonUtils.getString(caption, "language.id");
+                        final String languageCode = JsonUtils.getString(caption, "language.id");
-                        String ext = url.substring(url.lastIndexOf(".") + 1);
+                        final String ext = url.substring(url.lastIndexOf(".") + 1);
-                        MediaFormat fmt = MediaFormat.getFromSuffix(ext);
+                        final MediaFormat fmt = MediaFormat.getFromSuffix(ext);
                         if (fmt != null && languageCode != null)
                             subtitles.add(new SubtitlesStream(fmt, languageCode, url, false));
                     }
@@ -416,7 +407,7 @@ public class PeertubeStreamExtractor extends StreamExtractor {
     }
 
     @Override
-    public Locale getLanguageInfo() throws ParsingException {
+    public Locale getLanguageInfo() {
         try {
             return new Locale(JsonUtils.getString(json, "language.id"));
         } catch (ParsingException e) {

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeStreamInfoItemExtractor.java

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
 import com.grack.nanojson.JsonObject;
+
 import org.schabi.newpipe.extractor.ServiceList;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.localization.DateWrapper;
@@ -10,24 +11,23 @@ import org.schabi.newpipe.extractor.stream.StreamType;
 import org.schabi.newpipe.extractor.utils.JsonUtils;
 
 public class PeertubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
-
     protected final JsonObject item;
     private final String baseUrl;
 
-    public PeertubeStreamInfoItemExtractor(JsonObject item, String baseUrl) {
+    public PeertubeStreamInfoItemExtractor(final JsonObject item, final String baseUrl) {
         this.item = item;
         this.baseUrl = baseUrl;
     }
 
     @Override
     public String getUrl() throws ParsingException {
-        String uuid = JsonUtils.getString(item, "uuid");
+        final String uuid = JsonUtils.getString(item, "uuid");
         return ServiceList.PeerTube.getStreamLHFactory().fromId(uuid, baseUrl).getUrl();
     }
 
     @Override
     public String getThumbnailUrl() throws ParsingException {
-        String value = JsonUtils.getString(item, "thumbnailPath");
+        final String value = JsonUtils.getString(item, "thumbnailPath");
         return baseUrl + value;
     }
 
@@ -37,20 +37,19 @@ public class PeertubeStreamInfoItemExtractor implements StreamInfoItemExtractor
     }
 
     @Override
-    public boolean isAd() throws ParsingException {
+    public boolean isAd() {
         return false;
     }
 
     @Override
-    public long getViewCount() throws ParsingException {
+    public long getViewCount() {
-        Number value = JsonUtils.getNumber(item, "views");
+        return item.getLong("views");
-        return value.longValue();
     }
 
     @Override
     public String getUploaderUrl() throws ParsingException {
-        String name = JsonUtils.getString(item, "account.name");
+        final String name = JsonUtils.getString(item, "account.name");
-        String host = JsonUtils.getString(item, "account.host");
+        final String host = JsonUtils.getString(item, "account.host");
 
         return ServiceList.PeerTube.getChannelLHFactory().fromId("accounts/" + name + "@" + host, baseUrl).getUrl();
     }
@@ -77,14 +76,12 @@ public class PeertubeStreamInfoItemExtractor implements StreamInfoItemExtractor
     }
 
     @Override
-    public StreamType getStreamType() throws ParsingException {
+    public StreamType getStreamType() {
         return StreamType.VIDEO_STREAM;
     }
 
     @Override
-    public long getDuration() throws ParsingException {
+    public long getDuration() {
-        Number value = JsonUtils.getNumber(item, "duration");
+        return item.getLong("duration");
-        return value.longValue();
     }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeSubscriptionExtractor.java

@@ -1,21 +0,0 @@
-package org.schabi.newpipe.extractor.services.peertube.extractors;
-
-import org.schabi.newpipe.extractor.StreamingService;
-import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor;
-
-import java.util.List;
-
-public class PeertubeSubscriptionExtractor extends SubscriptionExtractor {
-
-    public PeertubeSubscriptionExtractor(StreamingService service, List<ContentSource> supportedSources) {
-        super(service, supportedSources);
-        // TODO Auto-generated constructor stub
-    }
-
-    @Override
-    public String getRelatedUrl() {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-}

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeSuggestionExtractor.java

@@ -1,22 +1,18 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
 import org.schabi.newpipe.extractor.StreamingService;
-import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.suggestion.SuggestionExtractor;
 
-import java.io.IOException;
 import java.util.Collections;
 import java.util.List;
 
 public class PeertubeSuggestionExtractor extends SuggestionExtractor {
-
+    public PeertubeSuggestionExtractor(final StreamingService service) {
-    public PeertubeSuggestionExtractor(StreamingService service) {
         super(service);
     }
 
     @Override
-    public List<String> suggestionList(String query) throws IOException, ExtractionException {
+    public List<String> suggestionList(final String query) {
         return Collections.emptyList();
     }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeTrendingExtractor.java

@@ -1,9 +1,9 @@
 package org.schabi.newpipe.extractor.services.peertube.extractors;
 
-import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.downloader.Response;
@@ -14,19 +14,20 @@ import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 import org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
-import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Utils;
 
 import java.io.IOException;
 
-import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.*;
+import javax.annotation.Nonnull;
+
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.COUNT_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.ITEMS_PER_PAGE;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.START_KEY;
+import static org.schabi.newpipe.extractor.services.peertube.PeertubeParsingHelper.collectStreamsFrom;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class PeertubeTrendingExtractor extends KioskExtractor<StreamInfoItem> {
-
+    public PeertubeTrendingExtractor(final StreamingService streamingService, final ListLinkHandler linkHandler, final String kioskId) {
-    private InfoItemsPage<StreamInfoItem> initPage;
-    private long total;
-
-    public PeertubeTrendingExtractor(StreamingService streamingService, ListLinkHandler linkHandler, String kioskId) {
         super(streamingService, linkHandler, kioskId);
     }
 
@@ -37,38 +38,18 @@ public class PeertubeTrendingExtractor extends KioskExtractor<StreamInfoItem> {
 
     @Override
     public InfoItemsPage<StreamInfoItem> getInitialPage() throws IOException, ExtractionException {
-        super.fetchPage();
+        final String pageUrl = getUrl() + "&" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE;
-        return initPage;
+        return getPage(new Page(pageUrl));
-    }
-
-    private void collectStreamsFrom(StreamInfoItemsCollector collector, JsonObject json, String pageUrl) throws ParsingException {
-        JsonArray contents;
-        try {
-            contents = (JsonArray) JsonUtils.getValue(json, "data");
-        } catch (Exception e) {
-            throw new ParsingException("Unable to extract kiosk info", e);
-        }
-
-        String baseUrl = getBaseUrl();
-        for (Object c : contents) {
-            if (c instanceof JsonObject) {
-                final JsonObject item = (JsonObject) c;
-                PeertubeStreamInfoItemExtractor extractor = new PeertubeStreamInfoItemExtractor(item, baseUrl);
-                collector.commit(extractor);
-            }
-        }
-
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        super.fetchPage();
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-        return initPage.getNextPageUrl();
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-    @Override
+        final Response response = getDownloader().get(page.getUrl());
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+
-        Response response = getDownloader().get(pageUrl);
         JsonObject json = null;
         if (response != null && !Utils.isBlank(response.responseBody())) {
             try {
@@ -78,20 +59,19 @@ public class PeertubeTrendingExtractor extends KioskExtractor<StreamInfoItem> {
             }
         }
 
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
         if (json != null) {
-            Number number = JsonUtils.getNumber(json, "total");
+            PeertubeParsingHelper.validate(json);
-            if (number != null) this.total = number.longValue();
+            final long total = json.getLong("total");
-            collectStreamsFrom(collector, json, pageUrl);
+
+            final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+            collectStreamsFrom(collector, json, getBaseUrl());
+
+            return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPage(page.getUrl(), total));
         } else {
-            throw new ExtractionException("Unable to get peertube kiosk info");
+            throw new ExtractionException("Unable to get PeerTube kiosk info");
         }
-        return new InfoItemsPage<>(collector, PeertubeParsingHelper.getNextPageUrl(pageUrl, total));
     }
 
     @Override
-    public void onFetchPage(Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(@Nonnull final Downloader downloader) throws IOException, ExtractionException { }
-        this.initPage = getPage(getUrl() + "&" + START_KEY + "=0&" + COUNT_KEY + "=" + ITEMS_PER_PAGE);
-    }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudChannelExtractor.java

@@ -1,9 +1,10 @@
 package org.schabi.newpipe.extractor.services.soundcloud.extractors;
 
-import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
+
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
 import org.schabi.newpipe.extractor.downloader.Downloader;
@@ -14,9 +15,10 @@ import org.schabi.newpipe.extractor.services.soundcloud.SoundcloudParsingHelper;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 
+import javax.annotation.Nonnull;
+
 import static org.schabi.newpipe.extractor.utils.JsonUtils.EMPTY_STRING;
 import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
@@ -25,21 +27,18 @@ public class SoundcloudChannelExtractor extends ChannelExtractor {
     private String userId;
     private JsonObject user;
 
-    private StreamInfoItemsCollector streamInfoItemsCollector = null;
+    public SoundcloudChannelExtractor(final StreamingService service, final ListLinkHandler linkHandler) {
-    private String nextPageUrl = null;
-
-    public SoundcloudChannelExtractor(StreamingService service, ListLinkHandler linkHandler) {
         super(service, linkHandler);
     }
 
     @Override
-    public void onFetchPage(@Nonnull Downloader downloader) throws IOException, ExtractionException {
+    public void onFetchPage(@Nonnull final Downloader downloader) throws IOException, ExtractionException {
 
         userId = getLinkHandler().getId();
-        String apiUrl = "https://api-v2.soundcloud.com/users/" + userId +
+        final String apiUrl = "https://api-v2.soundcloud.com/users/" + userId +
                 "?client_id=" + SoundcloudParsingHelper.clientId();
 
-        String response = downloader.get(apiUrl, getExtractorLocalization()).responseBody();
+        final String response = downloader.get(apiUrl, getExtractorLocalization()).responseBody();
         try {
             user = JsonParser.object().from(response);
         } catch (JsonParserException e) {
@@ -76,7 +75,7 @@ public class SoundcloudChannelExtractor extends ChannelExtractor {
 
     @Override
     public long getSubscriberCount() {
-        return user.getNumber("followers_count", 0).longValue();
+        return user.getLong("followers_count", 0);
     }
 
     @Override
@@ -85,61 +84,48 @@ public class SoundcloudChannelExtractor extends ChannelExtractor {
     }
 
     @Override
-    public String getParentChannelName() throws ParsingException {
+    public String getParentChannelName() {
         return "";
     }
 
     @Override
-    public String getParentChannelUrl() throws ParsingException {
+    public String getParentChannelUrl() {
         return "";
     }
 
     @Override
-    public String getParentChannelAvatarUrl() throws ParsingException {
+    public String getParentChannelAvatarUrl() {
         return "";
     }
 
     @Nonnull
     @Override
     public InfoItemsPage<StreamInfoItem> getInitialPage() throws ExtractionException {
-        if (streamInfoItemsCollector == null) {
-            computeNextPageAndGetStreams();
-        }
-        return new InfoItemsPage<>(streamInfoItemsCollector, getNextPageUrl());
-    }
-
-    @Override
-    public String getNextPageUrl() throws ExtractionException {
-        if (nextPageUrl == null) {
-            computeNextPageAndGetStreams();
-        }
-        return nextPageUrl;
-    }
-
-    private void computeNextPageAndGetStreams() throws ExtractionException {
         try {
-            streamInfoItemsCollector = new StreamInfoItemsCollector(getServiceId());
+            final StreamInfoItemsCollector streamInfoItemsCollector = new StreamInfoItemsCollector(getServiceId());
 
-            String apiUrl = "https://api-v2.soundcloud.com/users/" + getId() + "/tracks"
+            final String apiUrl = "https://api-v2.soundcloud.com/users/" + getId() + "/tracks"
                     + "?client_id=" + SoundcloudParsingHelper.clientId()
                     + "&limit=20"
                     + "&linked_partitioning=1";
 
-            nextPageUrl = SoundcloudParsingHelper.getStreamsFromApiMinItems(15, streamInfoItemsCollector, apiUrl);
+            final String nextPageUrl = SoundcloudParsingHelper.getStreamsFromApiMinItems(15, streamInfoItemsCollector, apiUrl);
+
+            return new InfoItemsPage<>(streamInfoItemsCollector, new Page(nextPageUrl));
         } catch (Exception e) {
             throw new ExtractionException("Could not get next page", e);
         }
     }
 
     @Override
-    public InfoItemsPage<StreamInfoItem> getPage(final String pageUrl) throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        if (isNullOrEmpty(pageUrl)) {
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+        final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
-        String nextPageUrl = SoundcloudParsingHelper.getStreamsFromApiMinItems(15, collector, pageUrl);
+        final String nextPageUrl = SoundcloudParsingHelper.getStreamsFromApiMinItems(15, collector, page.getUrl());
 
-        return new InfoItemsPage<>(collector, nextPageUrl);
+        return new InfoItemsPage<>(collector, new Page(nextPageUrl));
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudChannelInfoItemExtractor.java

@@ -32,12 +32,12 @@ public class SoundcloudChannelInfoItemExtractor implements ChannelInfoItemExtrac
 
     @Override
     public long getSubscriberCount() {
-        return itemObject.getNumber("followers_count", 0).longValue();
+        return itemObject.getLong("followers_count");
     }
 
     @Override
     public long getStreamCount() {
-        return itemObject.getNumber("track_count", 0).longValue();
+        return itemObject.getLong("track_count");
     }
 
     @Override

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudChartsExtractor.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.extractor.services.soundcloud.extractors;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -9,16 +10,14 @@ import org.schabi.newpipe.extractor.services.soundcloud.SoundcloudParsingHelper;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 
+import javax.annotation.Nonnull;
+
 import static org.schabi.newpipe.extractor.ServiceList.SoundCloud;
 import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class SoundcloudChartsExtractor extends KioskExtractor<StreamInfoItem> {
-    private StreamInfoItemsCollector collector = null;
-    private String nextPageUrl = null;
-
     public SoundcloudChartsExtractor(StreamingService service,
                                      ListLinkHandler linkHandler,
                                      String kioskId) {
@@ -36,20 +35,21 @@ public class SoundcloudChartsExtractor extends KioskExtractor<StreamInfoItem> {
     }
 
     @Override
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        if (isNullOrEmpty(pageUrl)) {
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+        final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
-        String nextPageUrl = SoundcloudParsingHelper.getStreamsFromApi(collector, pageUrl, true);
+        final String nextPageUrl = SoundcloudParsingHelper.getStreamsFromApi(collector, page.getUrl(), true);
 
-        return new InfoItemsPage<>(collector, nextPageUrl);
+        return new InfoItemsPage<>(collector, new Page(nextPageUrl));
     }
 
-
+    @Nonnull
-    private void computeNextPageAndStreams() throws IOException, ExtractionException {
+    @Override
-        collector = new StreamInfoItemsCollector(getServiceId());
+    public InfoItemsPage<StreamInfoItem> getInitialPage() throws IOException, ExtractionException {
+        final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
 
         String apiUrl = "https://api-v2.soundcloud.com/charts" +
                 "?genre=soundcloud:genres:all-music" +
@@ -61,27 +61,11 @@ public class SoundcloudChartsExtractor extends KioskExtractor<StreamInfoItem> {
             apiUrl += "&kind=trending";
         }
 
-
+        final String contentCountry = SoundCloud.getContentCountry().getCountryCode();
-        String contentCountry = SoundCloud.getContentCountry().getCountryCode();
         apiUrl += "&region=soundcloud:regions:" + contentCountry;
 
-        nextPageUrl = SoundcloudParsingHelper.getStreamsFromApi(collector, apiUrl, true);
+        final String nextPageUrl = SoundcloudParsingHelper.getStreamsFromApi(collector, apiUrl, true);
-    }
 
-    @Override
+        return new InfoItemsPage<>(collector, new Page(nextPageUrl));
-    public String getNextPageUrl() throws IOException, ExtractionException {
-        if (nextPageUrl == null) {
-            computeNextPageAndStreams();
-        }
-        return nextPageUrl;
-    }
-
-    @Nonnull
-    @Override
-    public InfoItemsPage<StreamInfoItem> getInitialPage() throws IOException, ExtractionException {
-        if (collector == null) {
-            computeNextPageAndStreams();
-        }
-        return new InfoItemsPage<>(collector, getNextPageUrl());
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudCommentsExtractor.java

@@ -4,7 +4,9 @@ import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
+
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.comments.CommentsExtractor;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
@@ -15,58 +17,63 @@ import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 
+import javax.annotation.Nonnull;
+
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+
 public class SoundcloudCommentsExtractor extends CommentsExtractor {
-
+    public SoundcloudCommentsExtractor(final StreamingService service, final ListLinkHandler uiHandler) {
-    private JsonObject json;
-
-    public SoundcloudCommentsExtractor(StreamingService service, ListLinkHandler uiHandler) {
         super(service, uiHandler);
     }
 
     @Nonnull
     @Override
-    public InfoItemsPage<CommentsInfoItem> getInitialPage() throws IOException, ExtractionException {
+    public InfoItemsPage<CommentsInfoItem> getInitialPage() throws ExtractionException, IOException {
-        final CommentsInfoItemsCollector collector = new CommentsInfoItemsCollector(getServiceId());
+        final Downloader downloader = NewPipe.getDownloader();
+        final Response response = downloader.get(getUrl());
 
-        collectStreamsFrom(collector, json.getArray("collection"));
+        final JsonObject json;
-
-        return new InfoItemsPage<>(collector, getNextPageUrl());
-    }
-
-    @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
-        return json.getString("next_href");
-    }
-
-    @Override
-    public InfoItemsPage<CommentsInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
-        Downloader dl = NewPipe.getDownloader();
-        Response rp = dl.get(pageUrl);
-        try {
-            json = JsonParser.object().from(rp.responseBody());
-        } catch (JsonParserException e) {
-            throw new ParsingException("Could not parse json", e);
-        }
-
-        final CommentsInfoItemsCollector collector = new CommentsInfoItemsCollector(getServiceId());
-        collectStreamsFrom(collector, json.getArray("collection"));
-
-        return new InfoItemsPage<>(collector, getNextPageUrl());
-    }
-
-    @Override
-    public void onFetchPage(@Nonnull Downloader downloader) throws IOException, ExtractionException {
-        Response response = downloader.get(getUrl());
         try {
             json = JsonParser.object().from(response.responseBody());
         } catch (JsonParserException e) {
             throw new ParsingException("Could not parse json", e);
         }
+
+        final CommentsInfoItemsCollector collector = new CommentsInfoItemsCollector(getServiceId());
+
+        collectStreamsFrom(collector, json.getArray("collection"));
+
+        return new InfoItemsPage<>(collector, new Page(json.getString("next_href")));
     }
 
+    @Override
+    public InfoItemsPage<CommentsInfoItem> getPage(final Page page) throws ExtractionException, IOException {
+        if (page == null || isNullOrEmpty(page.getUrl())) {
+            throw new IllegalArgumentException("Page doesn't contain an URL");
+        }
+
+        final Downloader downloader = NewPipe.getDownloader();
+        final Response response = downloader.get(page.getUrl());
+
+        final JsonObject json;
+        try {
+            json = JsonParser.object().from(response.responseBody());
+        } catch (JsonParserException e) {
+            throw new ParsingException("Could not parse json", e);
+        }
+
+        final CommentsInfoItemsCollector collector = new CommentsInfoItemsCollector(getServiceId());
+
+        collectStreamsFrom(collector, json.getArray("collection"));
+
+        return new InfoItemsPage<>(collector, new Page(json.getString("next_href")));
+    }
+
+    @Override
+    public void onFetchPage(@Nonnull final Downloader downloader) { }
+
     private void collectStreamsFrom(final CommentsInfoItemsCollector collector, final JsonArray entries) throws ParsingException {
         final String url = getUrl();
         for (Object comment : entries) {

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudCommentsInfoItemExtractor.java

@@ -6,10 +6,11 @@ import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.localization.DateWrapper;
 import org.schabi.newpipe.extractor.services.soundcloud.SoundcloudParsingHelper;
 
+import java.util.Objects;
+
 import javax.annotation.Nullable;
 
 public class SoundcloudCommentsInfoItemExtractor implements CommentsInfoItemExtractor {
-
     private JsonObject json;
     private String url;
 
@@ -19,32 +20,32 @@ public class SoundcloudCommentsInfoItemExtractor implements CommentsInfoItemExtr
     }
 
     @Override
-    public String getCommentId() throws ParsingException {
+    public String getCommentId() {
-        return json.getNumber("id").toString();
+        return Objects.toString(json.getLong("id"), null);
     }
 
     @Override
-    public String getCommentText() throws ParsingException {
+    public String getCommentText() {
         return json.getString("body");
     }
 
     @Override
-    public String getUploaderName() throws ParsingException {
+    public String getUploaderName() {
         return json.getObject("user").getString("username");
     }
 
     @Override
-    public String getUploaderAvatarUrl() throws ParsingException {
+    public String getUploaderAvatarUrl() {
         return json.getObject("user").getString("avatar_url");
     }
 
     @Override
-    public String getUploaderUrl() throws ParsingException {
+    public String getUploaderUrl() {
         return json.getObject("user").getString("permalink_url");
     }
 
     @Override
-    public String getTextualUploadDate() throws ParsingException {
+    public String getTextualUploadDate() {
         return json.getString("created_at");
     }
 
@@ -55,7 +56,7 @@ public class SoundcloudCommentsInfoItemExtractor implements CommentsInfoItemExtr
     }
 
     @Override
-    public int getLikeCount() throws ParsingException {
+    public int getLikeCount() {
         return -1;
     }
 
@@ -70,7 +71,7 @@ public class SoundcloudCommentsInfoItemExtractor implements CommentsInfoItemExtr
     }
 
     @Override
-    public String getThumbnailUrl() throws ParsingException {
+    public String getThumbnailUrl() {
         return json.getObject("user").getString("avatar_url");
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudPlaylistExtractor.java

@@ -6,6 +6,7 @@ import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
 
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -15,24 +16,23 @@ import org.schabi.newpipe.extractor.playlist.PlaylistExtractor;
 import org.schabi.newpipe.extractor.services.soundcloud.SoundcloudParsingHelper;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
+import org.schabi.newpipe.extractor.utils.Utils;
 
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
-@SuppressWarnings("WeakerAccess")
 public class SoundcloudPlaylistExtractor extends PlaylistExtractor {
-    private static final int streamsPerRequestedPage = 15;
+    private static final int STREAMS_PER_REQUESTED_PAGE = 15;
 
     private String playlistId;
     private JsonObject playlist;
 
-    private StreamInfoItemsCollector streamInfoItemsCollector;
-    private String nextPageUrl;
-
     public SoundcloudPlaylistExtractor(StreamingService service, ListLinkHandler linkHandler) {
         super(service, linkHandler);
     }
@@ -113,98 +113,73 @@ public class SoundcloudPlaylistExtractor extends PlaylistExtractor {
 
     @Override
     public long getStreamCount() {
-        return playlist.getNumber("track_count", 0).longValue();
+        return playlist.getLong("track_count");
     }
 
     @Nonnull
     @Override
-    public String getSubChannelName() throws ParsingException {
+    public String getSubChannelName() {
         return "";
     }
 
     @Nonnull
     @Override
-    public String getSubChannelUrl() throws ParsingException {
+    public String getSubChannelUrl() {
         return "";
     }
 
     @Nonnull
     @Override
-    public String getSubChannelAvatarUrl() throws ParsingException {
+    public String getSubChannelAvatarUrl() {
         return "";
     }
 
-    @Nonnull
+    public InfoItemsPage<StreamInfoItem> getInitialPage() {
-    @Override
+        final StreamInfoItemsCollector streamInfoItemsCollector = new StreamInfoItemsCollector(getServiceId());
-    public InfoItemsPage<StreamInfoItem> getInitialPage() throws IOException, ExtractionException {
+        final List<String> ids = new ArrayList<>();
-        if (streamInfoItemsCollector == null) {
-            computeInitialTracksAndNextPageUrl();
-        }
-        return new InfoItemsPage<>(streamInfoItemsCollector, nextPageUrl);
-    }
 
-    private void computeInitialTracksAndNextPageUrl() throws IOException, ExtractionException {
+        final JsonArray tracks = playlist.getArray("tracks");
-        streamInfoItemsCollector = new StreamInfoItemsCollector(getServiceId());
-        StringBuilder nextPageUrlBuilder = new StringBuilder("https://api-v2.soundcloud.com/tracks?client_id=");
-        nextPageUrlBuilder.append(SoundcloudParsingHelper.clientId());
-        nextPageUrlBuilder.append("&ids=");
-
-        JsonArray tracks = playlist.getArray("tracks");
         for (Object o : tracks) {
             if (o instanceof JsonObject) {
-                JsonObject track = (JsonObject) o;
+                final JsonObject track = (JsonObject) o;
                 if (track.has("title")) { // i.e. if full info is available
                     streamInfoItemsCollector.commit(new SoundcloudStreamInfoItemExtractor(track));
                 } else {
                     // %09d would be enough, but a 0 before the number does not create problems, so let's be sure
-                    nextPageUrlBuilder.append(String.format("%010d,", track.getInt("id")));
+                    ids.add(String.format("%010d", track.getInt("id")));
                 }
             }
         }
 
-        nextPageUrlBuilder.setLength(nextPageUrlBuilder.length() - 1); // remove trailing ,
+        return new InfoItemsPage<>(streamInfoItemsCollector, new Page(ids));
-        nextPageUrl = nextPageUrlBuilder.toString();
-        if (nextPageUrl.endsWith("&ids")) {
-            // there are no other videos
-            nextPageUrl = "";
-        }
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        if (nextPageUrl == null) {
+        if (page == null || isNullOrEmpty(page.getIds())) {
-            computeInitialTracksAndNextPageUrl();
+            throw new IllegalArgumentException("Page doesn't contain IDs");
-        }
-        return nextPageUrl;
         }
 
-    @Override
+        final List<String> currentIds;
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+        final List<String> nextIds;
-        if (isNullOrEmpty(pageUrl)) {
+        if (page.getIds().size() <= STREAMS_PER_REQUESTED_PAGE) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
+            // Fetch every remaining stream, there are less than the max
-        }
+            currentIds = page.getIds();
-
+            nextIds = null;
-        // see computeInitialTracksAndNextPageUrl
-        final int lengthFirstPartOfUrl = ("https://api-v2.soundcloud.com/tracks?client_id="
-                + SoundcloudParsingHelper.clientId()
-                + "&ids=").length();
-        final int lengthOfEveryStream = 11;
-
-        String currentPageUrl, nextUrl;
-        int lengthMaxStreams = lengthFirstPartOfUrl + lengthOfEveryStream * streamsPerRequestedPage;
-        if (pageUrl.length() <= lengthMaxStreams) {
-            currentPageUrl = pageUrl; // fetch every remaining video, there are less than the max
-            nextUrl = ""; // afterwards the list is complete
         } else {
-            currentPageUrl = pageUrl.substring(0, lengthMaxStreams);
+            currentIds = page.getIds().subList(0, STREAMS_PER_REQUESTED_PAGE);
-            nextUrl = pageUrl.substring(0, lengthFirstPartOfUrl) + pageUrl.substring(lengthMaxStreams);
+            nextIds = page.getIds().subList(STREAMS_PER_REQUESTED_PAGE, page.getIds().size());
         }
 
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+        final String currentPageUrl = "https://api-v2.soundcloud.com/tracks?client_id="
-        String response = NewPipe.getDownloader().get(currentPageUrl, getExtractorLocalization()).responseBody();
+                + SoundcloudParsingHelper.clientId()
+                + "&ids=" + Utils.join(",", currentIds);
+
+        final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+        final String response = NewPipe.getDownloader().get(currentPageUrl, getExtractorLocalization()).responseBody();
 
         try {
-            JsonArray tracks = JsonParser.array().from(response);
+            final JsonArray tracks = JsonParser.array().from(response);
             for (Object track : tracks) {
                 if (track instanceof JsonObject) {
                     collector.commit(new SoundcloudStreamInfoItemExtractor((JsonObject) track));
@@ -214,6 +189,6 @@ public class SoundcloudPlaylistExtractor extends PlaylistExtractor {
             throw new ParsingException("Could not parse json response", e);
         }
 
-        return new InfoItemsPage<>(collector, nextUrl);
+        return new InfoItemsPage<>(collector, new Page(nextIds));
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudPlaylistInfoItemExtractor.java

@@ -81,6 +81,6 @@ public class SoundcloudPlaylistInfoItemExtractor implements PlaylistInfoItemExtr
 
     @Override
     public long getStreamCount() {
-        return itemObject.getNumber("track_count", 0).longValue();
+        return itemObject.getLong("track_count");
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudSearchExtractor.java

@@ -4,9 +4,11 @@ import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
+
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.InfoItemExtractor;
 import org.schabi.newpipe.extractor.InfoItemsCollector;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -16,17 +18,18 @@ import org.schabi.newpipe.extractor.search.InfoItemsSearchCollector;
 import org.schabi.newpipe.extractor.search.SearchExtractor;
 import org.schabi.newpipe.extractor.utils.Parser;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URL;
 
+import javax.annotation.Nonnull;
+
 import static org.schabi.newpipe.extractor.services.soundcloud.linkHandler.SoundcloudSearchQueryHandlerFactory.ITEMS_PER_PAGE;
 import static org.schabi.newpipe.extractor.utils.JsonUtils.EMPTY_STRING;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class SoundcloudSearchExtractor extends SearchExtractor {
-
     private JsonArray searchCollection;
 
     public SoundcloudSearchExtractor(StreamingService service, SearchQueryHandler linkHandler) {
@@ -47,25 +50,24 @@ public class SoundcloudSearchExtractor extends SearchExtractor {
     @Nonnull
     @Override
     public InfoItemsPage<InfoItem> getInitialPage() throws IOException, ExtractionException {
-        return new InfoItemsPage<>(collectItems(searchCollection), getNextPageUrl());
+        return new InfoItemsPage<>(collectItems(searchCollection), getNextPageFromCurrentUrl(getUrl()));
     }
 
     @Override
-    public String getNextPageUrl() throws IOException, ExtractionException {
+    public InfoItemsPage<InfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        return getNextPageUrlFromCurrentUrl(getUrl());
+        if (page == null || isNullOrEmpty(page.getUrl())) {
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
-    @Override
-    public InfoItemsPage<InfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
         final Downloader dl = getDownloader();
         try {
-            final String response = dl.get(pageUrl, getExtractorLocalization()).responseBody();
+            final String response = dl.get(page.getUrl(), getExtractorLocalization()).responseBody();
             searchCollection = JsonParser.object().from(response).getArray("collection");
         } catch (JsonParserException e) {
             throw new ParsingException("Could not parse json response", e);
         }
 
-        return new InfoItemsPage<>(collectItems(searchCollection), getNextPageUrlFromCurrentUrl(pageUrl));
+        return new InfoItemsPage<>(collectItems(searchCollection), getNextPageFromCurrentUrl(page.getUrl()));
     }
 
     @Override
@@ -108,7 +110,7 @@ public class SoundcloudSearchExtractor extends SearchExtractor {
         return collector;
     }
 
-    private String getNextPageUrlFromCurrentUrl(String currentUrl)
+    private Page getNextPageFromCurrentUrl(String currentUrl)
             throws MalformedURLException, UnsupportedEncodingException {
         final int pageOffset = Integer.parseInt(
                 Parser.compatParseMap(
@@ -116,8 +118,7 @@ public class SoundcloudSearchExtractor extends SearchExtractor {
                                 .getQuery())
                         .get("offset"));
 
-        return currentUrl.replace("&offset=" +
+        return new Page(currentUrl.replace("&offset=" + pageOffset,
-                        Integer.toString(pageOffset),
+                "&offset=" + (pageOffset + ITEMS_PER_PAGE)));
-                "&offset=" + Integer.toString(pageOffset + ITEMS_PER_PAGE));
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudStreamExtractor.java

@@ -102,7 +102,7 @@ public class SoundcloudStreamExtractor extends StreamExtractor {
 
     @Override
     public long getLength() {
-        return track.getNumber("duration", 0).longValue() / 1000L;
+        return track.getLong("duration") / 1000L;
     }
 
     @Override
@@ -112,12 +112,12 @@ public class SoundcloudStreamExtractor extends StreamExtractor {
 
     @Override
     public long getViewCount() {
-        return track.getNumber("playback_count", 0).longValue();
+        return track.getLong("playback_count");
     }
 
     @Override
     public long getLikeCount() {
-        return track.getNumber("favoritings_count", -1).longValue();
+        return track.getLong("favoritings_count", -1);
     }
 
     @Override

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudStreamInfoItemExtractor.java

@@ -30,7 +30,7 @@ public class SoundcloudStreamInfoItemExtractor implements StreamInfoItemExtracto
 
     @Override
     public long getDuration() {
-        return itemObject.getNumber("duration", 0).longValue() / 1000L;
+        return itemObject.getLong("duration") / 1000L;
     }
 
     @Override
@@ -53,13 +53,9 @@ public class SoundcloudStreamInfoItemExtractor implements StreamInfoItemExtracto
         return new DateWrapper(SoundcloudParsingHelper.parseDateFrom(getTextualUploadDate()));
     }
 
-    private String getCreatedAt() {
-        return itemObject.getString("created_at");
-    }
-
     @Override
     public long getViewCount() {
-        return itemObject.getNumber("playback_count", 0).longValue();
+        return itemObject.getLong("playback_count");
     }
 
     @Override

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeChannelExtractor.java

@@ -2,6 +2,8 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
+
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
 import org.schabi.newpipe.extractor.downloader.Downloader;
@@ -16,10 +18,13 @@ import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 import org.schabi.newpipe.extractor.utils.Utils;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 
-import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.*;
+import javax.annotation.Nonnull;
+
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.fixThumbnailUrl;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getJsonResponse;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getTextFromObject;
 import static org.schabi.newpipe.extractor.utils.JsonUtils.EMPTY_STRING;
 import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
@@ -104,15 +109,6 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
         YoutubeParsingHelper.defaultAlertsCheck(initialData);
     }
 
-
-    @Override
-    public String getNextPageUrl() throws ExtractionException {
-        if (getVideoTab() == null) return "";
-        return getNextPageUrlFrom(getVideoTab().getObject("content").getObject("sectionListRenderer")
-                .getArray("contents").getObject(0).getObject("itemSectionRenderer")
-                .getArray("contents").getObject(0).getObject("gridRenderer").getArray("continuations"));
-    }
-
     @Nonnull
     @Override
     public String getUrl() throws ParsingException {
@@ -231,22 +227,27 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
     @Nonnull
     @Override
     public InfoItemsPage<StreamInfoItem> getInitialPage() throws ExtractionException {
-        StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+        final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+
+        Page nextPage = null;
 
         if (getVideoTab() != null) {
-            JsonArray videos = getVideoTab().getObject("content").getObject("sectionListRenderer").getArray("contents")
+            final JsonObject gridRenderer = getVideoTab().getObject("content").getObject("sectionListRenderer")
-                    .getObject(0).getObject("itemSectionRenderer").getArray("contents").getObject(0)
+                    .getArray("contents").getObject(0).getObject("itemSectionRenderer")
-                    .getObject("gridRenderer").getArray("items");
+                    .getArray("contents").getObject(0).getObject("gridRenderer");
-            collectStreamsFrom(collector, videos);
+
+            collectStreamsFrom(collector, gridRenderer.getArray("items"));
+
+            nextPage = getNextPageFrom(gridRenderer.getArray("continuations"));
         }
 
-        return new InfoItemsPage<>(collector, getNextPageUrl());
+        return new InfoItemsPage<>(collector, nextPage);
     }
 
     @Override
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        if (isNullOrEmpty(pageUrl)) {
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
         // Unfortunately, we have to fetch the page even if we are only getting next streams,
@@ -254,27 +255,26 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
         fetchPage();
 
         StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
-        final JsonArray ajaxJson = getJsonResponse(pageUrl, getExtractorLocalization());
+        final JsonArray ajaxJson = getJsonResponse(page.getUrl(), getExtractorLocalization());
 
         JsonObject sectionListContinuation = ajaxJson.getObject(1).getObject("response")
                 .getObject("continuationContents").getObject("gridContinuation");
 
         collectStreamsFrom(collector, sectionListContinuation.getArray("items"));
 
-        return new InfoItemsPage<>(collector, getNextPageUrlFrom(sectionListContinuation.getArray("continuations")));
+        return new InfoItemsPage<>(collector, getNextPageFrom(sectionListContinuation.getArray("continuations")));
     }
 
-
+    private Page getNextPageFrom(final JsonArray continuations) {
-    private String getNextPageUrlFrom(JsonArray continuations) {
         if (isNullOrEmpty(continuations)) {
-            return "";
+            return null;
         }
 
-        JsonObject nextContinuationData = continuations.getObject(0).getObject("nextContinuationData");
+        final JsonObject nextContinuationData = continuations.getObject(0).getObject("nextContinuationData");
-        String continuation = nextContinuationData.getString("continuation");
+        final String continuation = nextContinuationData.getString("continuation");
-        String clickTrackingParams = nextContinuationData.getString("clickTrackingParams");
+        final String clickTrackingParams = nextContinuationData.getString("clickTrackingParams");
-        return "https://www.youtube.com/browse_ajax?ctoken=" + continuation + "&continuation=" + continuation
+        return new Page("https://www.youtube.com/browse_ajax?ctoken=" + continuation
-                + "&itct=" + clickTrackingParams;
+                + "&continuation=" + continuation + "&itct=" + clickTrackingParams);
     }
 
     private void collectStreamsFrom(StreamInfoItemsCollector collector, JsonArray videos) throws ParsingException {

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeCommentsExtractor.java

@@ -3,6 +3,8 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
+
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.comments.CommentsExtractor;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
@@ -17,7 +19,6 @@ import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Parser;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
@@ -26,19 +27,19 @@ import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;
 
+import javax.annotation.Nonnull;
+
 import static java.util.Collections.singletonList;
 import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
-
 public class YoutubeCommentsExtractor extends CommentsExtractor {
-
     // using the mobile site for comments because it loads faster and uses get requests instead of post
     private static final String USER_AGENT = "Mozilla/5.0 (Android 8.1.0; Mobile; rv:62.0) Gecko/62.0 Firefox/62.0";
     private static final Pattern YT_CLIENT_NAME_PATTERN = Pattern.compile("INNERTUBE_CONTEXT_CLIENT_NAME\\\":(.*?)[,}]");
 
     private String ytClientVersion;
     private String ytClientName;
-    private InfoItemsPage<CommentsInfoItem> initPage;
+    private String responseBody;
 
     public YoutubeCommentsExtractor(StreamingService service, ListLinkHandler uiHandler) {
         super(service, uiHandler);
@@ -46,56 +47,49 @@ public class YoutubeCommentsExtractor extends CommentsExtractor {
 
     @Override
     public InfoItemsPage<CommentsInfoItem> getInitialPage() throws IOException, ExtractionException {
-        // initial page does not load any comments but is required to get comments token
+        String commentsTokenInside = findValue(responseBody, "commentSectionRenderer", "}");
-        super.fetchPage();
+        String commentsToken = findValue(commentsTokenInside, "continuation\":\"", "\"");
-        return initPage;
+        return getPage(getNextPage(commentsToken));
     }
 
-    @Override
+    private Page getNextPage(JsonObject ajaxJson) throws ParsingException {
-    public String getNextPageUrl() throws IOException, ExtractionException {
-        // initial page does not load any comments but is required to get comments token
-        super.fetchPage();
-        return initPage.getNextPageUrl();
-    }
-
-    private String getNextPageUrl(JsonObject ajaxJson) throws IOException, ParsingException {
-
         JsonArray arr;
         try {
             arr = JsonUtils.getArray(ajaxJson, "response.continuationContents.commentSectionContinuation.continuations");
         } catch (Exception e) {
-            return "";
+            return null;
         }
         if (arr.isEmpty()) {
-            return "";
+            return null;
         }
         String continuation;
         try {
             continuation = JsonUtils.getString(arr.getObject(0), "nextContinuationData.continuation");
         } catch (Exception e) {
-            return "";
+            return null;
         }
-        return getNextPageUrl(continuation);
+        return getNextPage(continuation);
     }
 
-    private String getNextPageUrl(String continuation) throws ParsingException {
+    private Page getNextPage(String continuation) throws ParsingException {
         Map<String, String> params = new HashMap<>();
         params.put("action_get_comments", "1");
         params.put("pbj", "1");
         params.put("ctoken", continuation);
         try {
-            return "https://m.youtube.com/watch_comment?" + getDataString(params);
+            return new Page("https://m.youtube.com/watch_comment?" + getDataString(params));
         } catch (UnsupportedEncodingException e) {
             throw new ParsingException("Could not get next page url", e);
         }
     }
 
     @Override
-    public InfoItemsPage<CommentsInfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+    public InfoItemsPage<CommentsInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        if (isNullOrEmpty(pageUrl)) {
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
-        String ajaxResponse = makeAjaxRequest(pageUrl);
+
+        String ajaxResponse = makeAjaxRequest(page.getUrl());
         JsonObject ajaxJson;
         try {
             ajaxJson = JsonParser.array().from(ajaxResponse).getObject(1);
@@ -104,11 +98,10 @@ public class YoutubeCommentsExtractor extends CommentsExtractor {
         }
         CommentsInfoItemsCollector collector = new CommentsInfoItemsCollector(getServiceId());
         collectCommentsFrom(collector, ajaxJson);
-        return new InfoItemsPage<>(collector, getNextPageUrl(ajaxJson));
+        return new InfoItemsPage<>(collector, getNextPage(ajaxJson));
     }
 
     private void collectCommentsFrom(CommentsInfoItemsCollector collector, JsonObject ajaxJson) throws ParsingException {
-
         JsonArray contents;
         try {
             contents = JsonUtils.getArray(ajaxJson, "response.continuationContents.commentSectionContinuation.items");
@@ -136,16 +129,13 @@ public class YoutubeCommentsExtractor extends CommentsExtractor {
         final Map<String, List<String>> requestHeaders = new HashMap<>();
         requestHeaders.put("User-Agent", singletonList(USER_AGENT));
         final Response response = downloader.get(getUrl(), requestHeaders, getExtractorLocalization());
-        String responseBody = response.responseBody();
+        responseBody = response.responseBody();
         ytClientVersion = findValue(responseBody, "INNERTUBE_CONTEXT_CLIENT_VERSION\":\"", "\"");
         ytClientName = Parser.matchGroup1(YT_CLIENT_NAME_PATTERN, responseBody);
-        String commentsTokenInside = findValue(responseBody, "commentSectionRenderer", "}");
-        String commentsToken = findValue(commentsTokenInside, "continuation\":\"", "\"");
-        initPage = getPage(getNextPageUrl(commentsToken));
     }
 
-    private String makeAjaxRequest(String siteUrl) throws IOException, ReCaptchaException {
 
+    private String makeAjaxRequest(String siteUrl) throws IOException, ReCaptchaException {
         Map<String, List<String>> requestHeaders = new HashMap<>();
         requestHeaders.put("Accept", singletonList("*/*"));
         requestHeaders.put("User-Agent", singletonList(USER_AGENT));
@@ -174,22 +164,4 @@ public class YoutubeCommentsExtractor extends CommentsExtractor {
         int endIndex = doc.indexOf(end, beginIndex);
         return doc.substring(beginIndex, endIndex);
     }
-
-    public static String getYoutubeText(@Nonnull JsonObject object) throws ParsingException {
-        try {
-            return JsonUtils.getString(object, "simpleText");
-        } catch (Exception e1) {
-            try {
-                JsonArray arr = JsonUtils.getArray(object, "runs");
-                String result = "";
-                for (int i = 0; i < arr.size(); i++) {
-                    result = result + JsonUtils.getString(arr.getObject(i), "text");
-                }
-                return result;
-            } catch (Exception e2) {
-                return "";
-            }
-        }
-    }
-
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeCommentsInfoItemExtractor.java

@@ -2,6 +2,7 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
+
 import org.schabi.newpipe.extractor.comments.CommentsInfoItemExtractor;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.localization.DateWrapper;
@@ -11,7 +12,7 @@ import org.schabi.newpipe.extractor.utils.Utils;
 
 import javax.annotation.Nullable;
 
-import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getTextFromObject;
 
 public class YoutubeCommentsInfoItemExtractor implements CommentsInfoItemExtractor {
 
@@ -43,7 +44,7 @@ public class YoutubeCommentsInfoItemExtractor implements CommentsInfoItemExtract
     @Override
     public String getName() throws ParsingException {
         try {
-            return YoutubeCommentsExtractor.getYoutubeText(JsonUtils.getObject(json, "authorText"));
+            return getTextFromObject(JsonUtils.getObject(json, "authorText"));
         } catch (Exception e) {
             return "";
         }
@@ -52,7 +53,7 @@ public class YoutubeCommentsInfoItemExtractor implements CommentsInfoItemExtract
     @Override
     public String getTextualUploadDate() throws ParsingException {
         try {
-            return YoutubeCommentsExtractor.getYoutubeText(JsonUtils.getObject(json, "publishedTimeText"));
+            return getTextFromObject(JsonUtils.getObject(json, "publishedTimeText"));
         } catch (Exception e) {
             throw new ParsingException("Could not get publishedTimeText", e);
         }
@@ -72,7 +73,7 @@ public class YoutubeCommentsInfoItemExtractor implements CommentsInfoItemExtract
     @Override
     public int getLikeCount() throws ParsingException {
         try {
-            return JsonUtils.getNumber(json, "likeCount").intValue();
+            return json.getInt("likeCount");
         } catch (Exception e) {
             throw new ParsingException("Could not get like count", e);
         }
@@ -81,7 +82,7 @@ public class YoutubeCommentsInfoItemExtractor implements CommentsInfoItemExtract
     @Override
     public String getCommentText() throws ParsingException {
         try {
-            String commentText = YoutubeCommentsExtractor.getYoutubeText(JsonUtils.getObject(json, "contentText"));
+            String commentText = getTextFromObject(JsonUtils.getObject(json, "contentText"));
             // youtube adds U+FEFF in some comments. eg. https://www.youtube.com/watch?v=Nj4F63E59io<feff>
             return Utils.removeUTF8BOM(commentText);
         } catch (Exception e) {
@@ -111,7 +112,7 @@ public class YoutubeCommentsInfoItemExtractor implements CommentsInfoItemExtract
     @Override
     public String getUploaderName() throws ParsingException {
         try {
-            return YoutubeCommentsExtractor.getYoutubeText(JsonUtils.getObject(json, "authorText"));
+            return getTextFromObject(JsonUtils.getObject(json, "authorText"));
         } catch (Exception e) {
             return "";
         }

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeFeedExtractor.java

@@ -5,6 +5,7 @@ import org.jsoup.nodes.Document;
 import org.jsoup.nodes.Element;
 import org.jsoup.select.Elements;
 import org.schabi.newpipe.extractor.ListExtractor;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.downloader.Response;
@@ -15,9 +16,10 @@ import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 
+import javax.annotation.Nonnull;
+
 public class YoutubeFeedExtractor extends FeedExtractor {
     public YoutubeFeedExtractor(StreamingService service, ListLinkHandler linkHandler) {
         super(service, linkHandler);
@@ -66,17 +68,7 @@ public class YoutubeFeedExtractor extends FeedExtractor {
     }
 
     @Override
-    public String getNextPageUrl() {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) {
-        return null;
+        return InfoItemsPage.emptyPage();
-    }
-
-    @Override
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) {
-        return null;
-    }
-
-    @Override
-    public boolean hasNextPage() {
-        return false;
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeMusicSearchExtractor.java

@@ -7,6 +7,7 @@ import com.grack.nanojson.JsonParserException;
 import com.grack.nanojson.JsonWriter;
 
 import org.schabi.newpipe.extractor.InfoItem;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -169,32 +170,25 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
 
         final JsonArray contents = initialData.getObject("contents").getObject("sectionListRenderer").getArray("contents");
 
-        for (Object content : contents) {
+        Page nextPage = null;
-            if (((JsonObject) content).has("musicShelfRenderer")) {
-                collectMusicStreamsFrom(collector, ((JsonObject) content).getObject("musicShelfRenderer").getArray("contents"));
-            }
-        }
-
-        return new InfoItemsPage<>(collector, getNextPageUrl());
-    }
-
-    @Override
-    public String getNextPageUrl() throws ExtractionException, IOException {
-        final JsonArray contents = initialData.getObject("contents").getObject("sectionListRenderer").getArray("contents");
 
         for (Object content : contents) {
             if (((JsonObject) content).has("musicShelfRenderer")) {
-                return getNextPageUrlFrom(((JsonObject) content).getObject("musicShelfRenderer").getArray("continuations"));
+                final JsonObject musicShelfRenderer = ((JsonObject) content).getObject("musicShelfRenderer");
+
+                collectMusicStreamsFrom(collector, musicShelfRenderer.getArray("contents"));
+
+                nextPage = getNextPageFrom(musicShelfRenderer.getArray("continuations"));
             }
         }
 
-        return "";
+        return new InfoItemsPage<>(collector, nextPage);
     }
 
     @Override
-    public InfoItemsPage<InfoItem> getPage(final String pageUrl) throws IOException, ExtractionException {
+    public InfoItemsPage<InfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        if (isNullOrEmpty(pageUrl)) {
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
         final InfoItemsSearchCollector collector = new InfoItemsSearchCollector(getServiceId());
@@ -236,7 +230,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
         headers.put("Referer", Collections.singletonList("music.youtube.com"));
         headers.put("Content-Type", Collections.singletonList("application/json"));
 
-        final String responseBody = getValidJsonResponseBody(getDownloader().post(pageUrl, headers, json));
+        final String responseBody = getValidJsonResponseBody(getDownloader().post(page.getUrl(), headers, json));
 
         final JsonObject ajaxJson;
         try {
@@ -250,7 +244,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
         collectMusicStreamsFrom(collector, musicShelfContinuation.getArray("contents"));
         final JsonArray continuations = musicShelfContinuation.getArray("continuations");
 
-        return new InfoItemsPage<>(collector, getNextPageUrlFrom(continuations));
+        return new InfoItemsPage<>(collector, getNextPageFrom(continuations));
     }
 
     private void collectMusicStreamsFrom(final InfoItemsSearchCollector collector, final JsonArray videos) {
@@ -495,16 +489,17 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
         }
     }
 
-    private String getNextPageUrlFrom(final JsonArray continuations) throws ParsingException, IOException, ReCaptchaException {
+    private Page getNextPageFrom(final JsonArray continuations) throws ParsingException, IOException, ReCaptchaException {
         if (isNullOrEmpty(continuations)) {
-            return "";
+            return null;
         }
 
         final JsonObject nextContinuationData = continuations.getObject(0).getObject("nextContinuationData");
         final String continuation = nextContinuationData.getString("continuation");
         final String clickTrackingParams = nextContinuationData.getString("clickTrackingParams");
 
-        return "https://music.youtube.com/youtubei/v1/search?ctoken=" + continuation + "&continuation=" + continuation
+        return new Page("https://music.youtube.com/youtubei/v1/search?ctoken=" + continuation
-                + "&itct=" + clickTrackingParams + "&alt=json&key=" + YoutubeParsingHelper.getYoutubeMusicKeys()[0];
+                + "&continuation=" + continuation + "&itct=" + clickTrackingParams + "&alt=json"
+                + "&key=" + YoutubeParsingHelper.getYoutubeMusicKeys()[0]);
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubePlaylistExtractor.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -53,7 +54,7 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
     }
 
     private JsonObject getUploaderInfo() throws ParsingException {
-        JsonArray items = initialData.getObject("sidebar").getObject("playlistSidebarRenderer").getArray("items");
+        final JsonArray items = initialData.getObject("sidebar").getObject("playlistSidebarRenderer").getArray("items");
 
         JsonObject videoOwner = items.getObject(1).getObject("playlistSidebarSecondaryInfoRenderer").getObject("videoOwner");
         if (videoOwner.has("videoOwnerRenderer")) {
@@ -77,19 +78,10 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
         }
     }
 
-    @Override
-    public String getNextPageUrl() {
-        return getNextPageUrlFrom(initialData.getObject("contents").getObject("twoColumnBrowseResultsRenderer")
-                .getArray("tabs").getObject(0).getObject("tabRenderer").getObject("content")
-                .getObject("sectionListRenderer").getArray("contents").getObject(0)
-                .getObject("itemSectionRenderer").getArray("contents").getObject(0)
-                .getObject("playlistVideoListRenderer").getArray("continuations"));
-    }
-
     @Nonnull
     @Override
     public String getName() throws ParsingException {
-        String name = getTextFromObject(playlistInfo.getObject("title"));
+        final String name = getTextFromObject(playlistInfo.getObject("title"));
         if (name != null && !name.isEmpty()) return name;
 
         return initialData.getObject("microformat").getObject("microformatDataRenderer").getString("title");
@@ -138,7 +130,7 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
     @Override
     public String getUploaderAvatarUrl() throws ParsingException {
         try {
-            String url = getUploaderInfo().getObject("thumbnail").getArray("thumbnails").getObject(0).getString("url");
+            final String url = getUploaderInfo().getObject("thumbnail").getArray("thumbnails").getObject(0).getString("url");
 
             return fixThumbnailUrl(url);
         } catch (Exception e) {
@@ -149,7 +141,7 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
     @Override
     public long getStreamCount() throws ParsingException {
         try {
-            String viewsText = getTextFromObject(getPlaylistInfo().getArray("stats").getObject(0));
+            final String viewsText = getTextFromObject(getPlaylistInfo().getArray("stats").getObject(0));
             return Long.parseLong(Utils.removeNonDigitCharacters(viewsText));
         } catch (Exception e) {
             throw new ParsingException("Could not get video count from playlist", e);
@@ -178,6 +170,7 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
     @Override
     public InfoItemsPage<StreamInfoItem> getInitialPage() {
         final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
+        Page nextPage = null;
 
         final JsonArray contents = initialData.getObject("contents").getObject("twoColumnBrowseResultsRenderer")
                 .getArray("tabs").getObject(0).getObject("tabRenderer").getObject("content")
@@ -193,48 +186,51 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
                             .getObject("videoList").getObject("playlistVideoListRenderer").getArray("contents"));
                 }
             }
+
+            return new InfoItemsPage<>(collector, null);
         } else if (contents.getObject(0).has("playlistVideoListRenderer")) {
-            final JsonArray videos = contents.getObject(0)
+            final JsonObject videos = contents.getObject(0).getObject("playlistVideoListRenderer");
-                    .getObject("playlistVideoListRenderer").getArray("contents");
+            collectStreamsFrom(collector, videos.getArray("contents"));
-            collectStreamsFrom(collector, videos);
+
+            nextPage = getNextPageFrom(videos.getArray("continuations"));
         }
 
-        return new InfoItemsPage<>(collector, getNextPageUrl());
+        return new InfoItemsPage<>(collector, nextPage);
     }
 
     @Override
-    public InfoItemsPage<StreamInfoItem> getPage(final String pageUrl) throws IOException, ExtractionException {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        if (isNullOrEmpty(pageUrl)) {
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
+            throw new IllegalArgumentException("Page doesn't contain an URL");
         }
 
         final StreamInfoItemsCollector collector = new StreamInfoItemsCollector(getServiceId());
-        final JsonArray ajaxJson = getJsonResponse(pageUrl, getExtractorLocalization());
+        final JsonArray ajaxJson = getJsonResponse(page.getUrl(), getExtractorLocalization());
 
         final JsonObject sectionListContinuation = ajaxJson.getObject(1).getObject("response")
                 .getObject("continuationContents").getObject("playlistVideoListContinuation");
 
         collectStreamsFrom(collector, sectionListContinuation.getArray("contents"));
 
-        return new InfoItemsPage<>(collector, getNextPageUrlFrom(sectionListContinuation.getArray("continuations")));
+        return new InfoItemsPage<>(collector, getNextPageFrom(sectionListContinuation.getArray("continuations")));
     }
 
-    private String getNextPageUrlFrom(final JsonArray continuations) {
+    private Page getNextPageFrom(final JsonArray continuations) {
         if (isNullOrEmpty(continuations)) {
-            return "";
+            return null;
         }
 
-        JsonObject nextContinuationData = continuations.getObject(0).getObject("nextContinuationData");
+        final JsonObject nextContinuationData = continuations.getObject(0).getObject("nextContinuationData");
-        String continuation = nextContinuationData.getString("continuation");
+        final String continuation = nextContinuationData.getString("continuation");
-        String clickTrackingParams = nextContinuationData.getString("clickTrackingParams");
+        final String clickTrackingParams = nextContinuationData.getString("clickTrackingParams");
-        return "https://www.youtube.com/browse_ajax?ctoken=" + continuation + "&continuation=" + continuation
+        return new Page("https://www.youtube.com/browse_ajax?ctoken=" + continuation + "&continuation=" + continuation
-                + "&itct=" + clickTrackingParams;
+                + "&itct=" + clickTrackingParams);
     }
 
     private void collectStreamsFrom(final StreamInfoItemsCollector collector, final JsonArray videos) {
         final TimeAgoParser timeAgoParser = getTimeAgoParser();
 
-        for (Object video : videos) {
+        for (final Object video : videos) {
             if (((JsonObject) video).has("playlistVideoRenderer")) {
                 collector.commit(new YoutubeStreamInfoItemExtractor(((JsonObject) video).getObject("playlistVideoRenderer"), timeAgoParser) {
                     @Override

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeSearchExtractor.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 import org.schabi.newpipe.extractor.InfoItem;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -101,28 +102,27 @@ public class YoutubeSearchExtractor extends SearchExtractor {
         final JsonArray sections = initialData.getObject("contents").getObject("twoColumnSearchResultsRenderer")
                 .getObject("primaryContents").getObject("sectionListRenderer").getArray("contents");
 
+        Page nextPage = null;
+
         for (Object section : sections) {
-            collectStreamsFrom(collector, ((JsonObject) section).getObject("itemSectionRenderer").getArray("contents"));
+            final JsonObject itemSectionRenderer = ((JsonObject) section).getObject("itemSectionRenderer");
+
+            collectStreamsFrom(collector, itemSectionRenderer.getArray("contents"));
+
+            nextPage = getNextPageFrom(itemSectionRenderer.getArray("continuations"));
         }
 
-        return new InfoItemsPage<>(collector, getNextPageUrl());
+        return new InfoItemsPage<>(collector, nextPage);
     }
 
     @Override
-    public String getNextPageUrl() throws ExtractionException {
+    public InfoItemsPage<InfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        return getNextPageUrlFrom(initialData.getObject("contents").getObject("twoColumnSearchResultsRenderer")
+        if (page == null || isNullOrEmpty(page.getUrl())) {
-                .getObject("primaryContents").getObject("sectionListRenderer").getArray("contents")
+            throw new IllegalArgumentException("Page doesn't contain an URL");
-                .getObject(0).getObject("itemSectionRenderer").getArray("continuations"));
-    }
-
-    @Override
-    public InfoItemsPage<InfoItem> getPage(final String pageUrl) throws IOException, ExtractionException {
-        if (isNullOrEmpty(pageUrl)) {
-            throw new ExtractionException(new IllegalArgumentException("Page url is empty or null"));
         }
 
         final InfoItemsSearchCollector collector = new InfoItemsSearchCollector(getServiceId());
-        final JsonArray ajaxJson = getJsonResponse(pageUrl, getExtractorLocalization());
+        final JsonArray ajaxJson = getJsonResponse(page.getUrl(), getExtractorLocalization());
 
         final JsonObject itemSectionRenderer = ajaxJson.getObject(1).getObject("response")
                 .getObject("continuationContents").getObject("itemSectionContinuation");
@@ -130,7 +130,7 @@ public class YoutubeSearchExtractor extends SearchExtractor {
         collectStreamsFrom(collector, itemSectionRenderer.getArray("contents"));
         final JsonArray continuations = itemSectionRenderer.getArray("continuations");
 
-        return new InfoItemsPage<>(collector, getNextPageUrlFrom(continuations));
+        return new InfoItemsPage<>(collector, getNextPageFrom(continuations));
     }
 
     private void collectStreamsFrom(final InfoItemsSearchCollector collector, final JsonArray videos) throws NothingFoundException, ParsingException {
@@ -150,16 +150,16 @@ public class YoutubeSearchExtractor extends SearchExtractor {
         }
     }
 
-    private String getNextPageUrlFrom(final JsonArray continuations) throws ParsingException {
+    private Page getNextPageFrom(final JsonArray continuations) throws ParsingException {
         if (isNullOrEmpty(continuations)) {
-            return "";
+            return null;
         }
 
         final JsonObject nextContinuationData = continuations.getObject(0).getObject("nextContinuationData");
         final String continuation = nextContinuationData.getString("continuation");
         final String clickTrackingParams = nextContinuationData.getString("clickTrackingParams");
 
-        return getUrl() + "&pbj=1&ctoken=" + continuation + "&continuation=" + continuation
+        return new Page(getUrl() + "&pbj=1&ctoken=" + continuation + "&continuation=" + continuation
-                + "&itct=" + clickTrackingParams;
+                + "&itct=" + clickTrackingParams);
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeTrendingExtractor.java

@@ -23,6 +23,7 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
 
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -61,13 +62,8 @@ public class YoutubeTrendingExtractor extends KioskExtractor<StreamInfoItem> {
     }
 
     @Override
-    public String getNextPageUrl() {
+    public InfoItemsPage<StreamInfoItem> getPage(final Page page) {
-        return "";
+        return InfoItemsPage.emptyPage();
-    }
-
-    @Override
-    public InfoItemsPage<StreamInfoItem> getPage(String pageUrl) {
-        return null;
     }
 
     @Nonnull
@@ -98,6 +94,7 @@ public class YoutubeTrendingExtractor extends KioskExtractor<StreamInfoItem> {
                 collector.commit(new YoutubeStreamInfoItemExtractor(videoInfo, timeAgoParser));
             }
         }
-        return new InfoItemsPage<>(collector, getNextPageUrl());
+
+        return new InfoItemsPage<>(collector, null);
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/utils/Utils.java

@@ -7,6 +7,7 @@ import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLDecoder;
 import java.util.Collection;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
@@ -222,4 +223,16 @@ public class Utils {
 
         return true;
     }
+
+    public static String join(final CharSequence delimiter, final Iterable<? extends CharSequence> elements) {
+        final StringBuilder stringBuilder = new StringBuilder();
+        final Iterator<? extends CharSequence> iterator = elements.iterator();
+        while (iterator.hasNext()) {
+            stringBuilder.append(iterator.next());
+            if (iterator.hasNext()) {
+                stringBuilder.append(delimiter);
+            }
+        }
+        return stringBuilder.toString();
+    }
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/DefaultTests.java

@@ -2,6 +2,7 @@ package org.schabi.newpipe.extractor.services;
 
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.ListExtractor;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
@@ -84,9 +85,8 @@ public final class DefaultTests {
     }
 
     public static <T extends InfoItem> void assertNoMoreItems(ListExtractor<T> extractor) throws Exception {
-        assertFalse("More items available when it shouldn't", extractor.hasNextPage());
+        final ListExtractor.InfoItemsPage<T> initialPage = extractor.getInitialPage();
-        final String nextPageUrl = extractor.getNextPageUrl();
+        assertFalse("More items available when it shouldn't", initialPage.hasNextPage());
-        assertTrue("Next page is not empty or null", isNullOrEmpty(nextPageUrl));
     }
 
     public static void assertNoDuplicatedItems(StreamingService expectedService,
@@ -118,8 +118,9 @@ public final class DefaultTests {
     }
 
     public static <T extends InfoItem> ListExtractor.InfoItemsPage<T> defaultTestMoreItems(ListExtractor<T> extractor) throws Exception {
-        assertTrue("Doesn't have more items", extractor.hasNextPage());
+        final ListExtractor.InfoItemsPage<T> initialPage = extractor.getInitialPage();
-        ListExtractor.InfoItemsPage<T> nextPage = extractor.getPage(extractor.getNextPageUrl());
+        assertTrue("Doesn't have more items", initialPage.hasNextPage());
+        ListExtractor.InfoItemsPage<T> nextPage = extractor.getPage(initialPage.getNextPage());
         final List<T> items = nextPage.getItems();
         assertFalse("Next page is empty", items.isEmpty());
         assertEmptyErrors("Next page have errors", nextPage.getErrors());
@@ -129,9 +130,9 @@ public final class DefaultTests {
     }
 
     public static void defaultTestGetPageInNewExtractor(ListExtractor<? extends InfoItem> extractor, ListExtractor<? extends InfoItem> newExtractor) throws Exception {
-        final String nextPageUrl = extractor.getNextPageUrl();
+        final Page nextPage = extractor.getInitialPage().getNextPage();
 
-        final ListExtractor.InfoItemsPage<? extends InfoItem> page = newExtractor.getPage(nextPageUrl);
+        final ListExtractor.InfoItemsPage<? extends InfoItem> page = newExtractor.getPage(nextPage);
         defaultTestListOfItems(extractor.getService(), page.getItems(), page.getErrors());
     }
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/peertube/PeertubeCommentsExtractorTest.java

@@ -5,6 +5,7 @@ import org.junit.Test;
 import org.schabi.newpipe.DownloaderTestImpl;
 import org.schabi.newpipe.extractor.ListExtractor.InfoItemsPage;
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.comments.CommentsInfo;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -14,7 +15,9 @@ import org.schabi.newpipe.extractor.utils.Utils;
 import java.io.IOException;
 import java.util.List;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 import static org.schabi.newpipe.extractor.ServiceList.PeerTube;
 
 public class PeertubeCommentsExtractorTest {
@@ -31,11 +34,10 @@ public class PeertubeCommentsExtractorTest {
         @Test
         public void testGetComments() throws IOException, ExtractionException {
             InfoItemsPage<CommentsInfoItem> comments = extractor.getInitialPage();
-            assertTrue(comments.getErrors().isEmpty());
-
             boolean result = findInComments(comments, "@root A great documentary on a great guy.");
+
             while (comments.hasNextPage() && !result) {
-                comments = extractor.getPage(comments.getNextPageUrl());
+                comments = extractor.getPage(comments.getNextPage());
                 result = findInComments(comments, "@root A great documentary on a great guy.");
             }
 
@@ -44,24 +46,26 @@ public class PeertubeCommentsExtractorTest {
 
         @Test
         public void testGetCommentsFromCommentsInfo() throws IOException, ExtractionException {
-            final CommentsInfo commentsInfo = CommentsInfo.getInfo("https://framatube.org/videos/watch/a8ea95b8-0396-49a6-8f30-e25e25fb2828");
+            CommentsInfo commentsInfo = CommentsInfo.getInfo("https://framatube.org/videos/watch/a8ea95b8-0396-49a6-8f30-e25e25fb2828");
-            assertTrue(commentsInfo.getErrors().isEmpty());
             assertEquals("Comments", commentsInfo.getName());
 
             boolean result = findInComments(commentsInfo.getRelatedItems(), "Loved it!!!");
-            String nextPage = commentsInfo.getNextPageUrl();
+
-            while (!Utils.isBlank(nextPage) && !result) {
+            Page nextPage = commentsInfo.getNextPage();
-                final InfoItemsPage<CommentsInfoItem> moreItems = CommentsInfo.getMoreItems(PeerTube, commentsInfo, nextPage);
+            InfoItemsPage<CommentsInfoItem> moreItems = new InfoItemsPage<>(null, nextPage, null);
+            while (moreItems.hasNextPage() && !result) {
+                moreItems = CommentsInfo.getMoreItems(PeerTube, commentsInfo, nextPage);
                 result = findInComments(moreItems.getItems(), "Loved it!!!");
-                nextPage = moreItems.getNextPageUrl();
+                nextPage = moreItems.getNextPage();
             }
+
             assertTrue(result);
         }
 
         @Test
         public void testGetCommentsAllData() throws IOException, ExtractionException {
-            final InfoItemsPage<CommentsInfoItem> comments = extractor.getInitialPage();
+            InfoItemsPage<CommentsInfoItem> comments = extractor.getInitialPage();
-            for (final CommentsInfoItem c : comments.getItems()) {
+            for (CommentsInfoItem c : comments.getItems()) {
                 assertFalse(Utils.isBlank(c.getUploaderUrl()));
                 assertFalse(Utils.isBlank(c.getUploaderName()));
                 assertFalse(Utils.isBlank(c.getUploaderAvatarUrl()));
@@ -71,16 +75,16 @@ public class PeertubeCommentsExtractorTest {
                 assertFalse(Utils.isBlank(c.getTextualUploadDate()));
                 assertFalse(Utils.isBlank(c.getThumbnailUrl()));
                 assertFalse(Utils.isBlank(c.getUrl()));
-                assertEquals(-1, c.getLikeCount());
+                assertFalse(c.getLikeCount() != -1);
             }
         }
 
-        private boolean findInComments(final InfoItemsPage<CommentsInfoItem> comments, final String comment) {
+        private boolean findInComments(InfoItemsPage<CommentsInfoItem> comments, String comment) {
             return findInComments(comments.getItems(), comment);
         }
 
-        private boolean findInComments(final List<CommentsInfoItem> comments, final String comment) {
+        private boolean findInComments(List<CommentsInfoItem> comments, String comment) {
-            for (final CommentsInfoItem c : comments) {
+            for (CommentsInfoItem c : comments) {
                 if (c.getCommentText().contains(comment)) {
                     return true;
                 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/peertube/search/PeertubeSearchExtractorTest.java

@@ -51,7 +51,7 @@ public class PeertubeSearchExtractorTest {
             extractor.fetchPage();
 
             final InfoItemsPage<InfoItem> page1 = extractor.getInitialPage();
-            final InfoItemsPage<InfoItem> page2 = extractor.getPage(page1.getNextPageUrl());
+            final InfoItemsPage<InfoItem> page2 = extractor.getPage(page1.getNextPage());
 
             assertNoDuplicatedItems(PeerTube, page1, page2);
         }

extractor/src/test/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudPlaylistExtractorTest.java

@@ -268,7 +268,7 @@ public class SoundcloudPlaylistExtractorTest {
             ListExtractor.InfoItemsPage<StreamInfoItem> currentPage = defaultTestMoreItems(extractor);
             // Test for 2 more levels
             for (int i = 0; i < 2; i++) {
-                currentPage = extractor.getPage(currentPage.getNextPageUrl());
+                currentPage = extractor.getPage(currentPage.getNextPage());
                 defaultTestListOfItems(SoundCloud, currentPage.getItems(), currentPage.getErrors());
             }
         }

extractor/src/test/java/org/schabi/newpipe/extractor/services/soundcloud/search/SoundcloudSearchExtractorTest.java

@@ -119,7 +119,7 @@ public class SoundcloudSearchExtractorTest {
             extractor.fetchPage();
 
             final InfoItemsPage<InfoItem> page1 = extractor.getInitialPage();
-            final InfoItemsPage<InfoItem> page2 = extractor.getPage(page1.getNextPageUrl());
+            final InfoItemsPage<InfoItem> page2 = extractor.getPage(page1.getNextPage());
 
             assertNoDuplicatedItems(SoundCloud, page1, page2);
         }

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeCommentsExtractorTest.java

@@ -5,6 +5,7 @@ import org.junit.Test;
 import org.schabi.newpipe.DownloaderTestImpl;
 import org.schabi.newpipe.extractor.ListExtractor.InfoItemsPage;
 import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.comments.CommentsInfo;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -22,7 +23,6 @@ import static org.junit.Assert.assertTrue;
 import static org.schabi.newpipe.extractor.ServiceList.YouTube;
 
 public class YoutubeCommentsExtractorTest {
-
     private static final String urlYT = "https://www.youtube.com/watch?v=D00Au7k3i6o";
     private static final String urlInvidious = "https://invidio.us/watch?v=D00Au7k3i6o";
     private static YoutubeCommentsExtractor extractorYT;
@@ -33,6 +33,7 @@ public class YoutubeCommentsExtractorTest {
         NewPipe.init(DownloaderTestImpl.getInstance());
         extractorYT = (YoutubeCommentsExtractor) YouTube
                 .getCommentsExtractor(urlYT);
+        extractorYT.fetchPage();
         extractorInvidious = (YoutubeCommentsExtractor) YouTube
                 .getCommentsExtractor(urlInvidious);
     }
@@ -44,12 +45,11 @@ public class YoutubeCommentsExtractorTest {
     }
 
     private boolean getCommentsHelper(YoutubeCommentsExtractor extractor) throws IOException, ExtractionException {
-        boolean result;
         InfoItemsPage<CommentsInfoItem> comments = extractor.getInitialPage();
-        result = findInComments(comments, "s1ck m3m3");
+        boolean result = findInComments(comments, "s1ck m3m3");
 
         while (comments.hasNextPage() && !result) {
-            comments = extractor.getPage(comments.getNextPageUrl());
+            comments = extractor.getPage(comments.getNextPage());
             result = findInComments(comments, "s1ck m3m3");
         }
 
@@ -63,16 +63,18 @@ public class YoutubeCommentsExtractorTest {
     }
 
     private boolean getCommentsFromCommentsInfoHelper(String url) throws IOException, ExtractionException {
-        boolean result = false;
         CommentsInfo commentsInfo = CommentsInfo.getInfo(url);
-        result = findInComments(commentsInfo.getRelatedItems(), "s1ck m3m3");
 
-   /*     String nextPage = commentsInfo.getNextPageUrl();
+        assertEquals("Comments", commentsInfo.getName());
-        while (!Utils.isBlank(nextPage) && !result) {
+        boolean result = findInComments(commentsInfo.getRelatedItems(), "s1ck m3m3");
-            InfoItemsPage<CommentsInfoItem> moreItems = CommentsInfo.getMoreItems(YouTube, commentsInfo, nextPage);
+
+        Page nextPage = commentsInfo.getNextPage();
+        InfoItemsPage<CommentsInfoItem> moreItems = new InfoItemsPage<>(null, nextPage, null);
+        while (moreItems.hasNextPage() && !result) {
+            moreItems = CommentsInfo.getMoreItems(YouTube, commentsInfo, nextPage);
             result = findInComments(moreItems.getItems(), "s1ck m3m3");
-            nextPage = moreItems.getNextPageUrl();
+            nextPage = moreItems.getNextPage();
-        }*/
+        }
         return result;
     }
 

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubePlaylistExtractorTest.java

@@ -209,7 +209,7 @@ public class YoutubePlaylistExtractorTest {
 
             // test for 2 more levels
             for (int i = 0; i < 2; i++) {
-                currentPage = extractor.getPage(currentPage.getNextPageUrl());
+                currentPage = extractor.getPage(currentPage.getNextPage());
                 defaultTestListOfItems(YouTube, currentPage.getItems(), currentPage.getErrors());
             }
         }

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/search/YoutubeSearchExtractorTest.java

@@ -19,8 +19,9 @@ import static org.junit.Assert.assertTrue;
 import static org.schabi.newpipe.extractor.ExtractorAsserts.assertEmptyErrors;
 import static org.schabi.newpipe.extractor.ServiceList.YouTube;
 import static org.schabi.newpipe.extractor.services.DefaultTests.assertNoDuplicatedItems;
-import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.*;
+import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.CHANNELS;
-import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.PLAYLISTS;
+import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.VIDEOS;
 
 public class YoutubeSearchExtractorTest {
     public static class All extends DefaultSearchExtractorTest {
@@ -186,15 +187,14 @@ public class YoutubeSearchExtractorTest {
 
         @Test
         public void testMoreRelatedItems() throws Exception {
+            final ListExtractor.InfoItemsPage<InfoItem> initialPage = extractor().getInitialPage();
             // YouTube actually gives us an empty next page, but after that, no more pages.
-            assertTrue(extractor.hasNextPage());
+            assertTrue(initialPage.hasNextPage());
-            final ListExtractor.InfoItemsPage<InfoItem> nextEmptyPage = extractor.getPage(extractor.getNextPageUrl());
+            final ListExtractor.InfoItemsPage<InfoItem> nextEmptyPage = extractor.getPage(initialPage.getNextPage());
             assertEquals(0, nextEmptyPage.getItems().size());
             assertEmptyErrors("Empty page has errors", nextEmptyPage.getErrors());
 
             assertFalse("More items available when it shouldn't", nextEmptyPage.hasNextPage());
-            final String nextPageUrl = nextEmptyPage.getNextPageUrl();
-            assertTrue("Next page is not empty or null", isNullOrEmpty(nextPageUrl));
         }
     }
 
@@ -206,7 +206,7 @@ public class YoutubeSearchExtractorTest {
             extractor.fetchPage();
 
             final ListExtractor.InfoItemsPage<InfoItem> page1 = extractor.getInitialPage();
-            final ListExtractor.InfoItemsPage<InfoItem> page2 = extractor.getPage(page1.getNextPageUrl());
+            final ListExtractor.InfoItemsPage<InfoItem> page2 = extractor.getPage(page1.getNextPage());
 
             assertNoDuplicatedItems(YouTube, page1, page2);
         }

extractor/src/test/java/org/schabi/newpipe/extractor/utils/UtilsTest.java

@@ -1,18 +1,24 @@
 package org.schabi.newpipe.extractor.utils;
 
-import com.grack.nanojson.JsonParserException;
 import org.junit.Test;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 
+import java.util.Arrays;
+
 import static org.junit.Assert.assertEquals;
 
 public class UtilsTest {
     @Test
-    public void testMixedNumberWordToLong() throws JsonParserException, ParsingException {
+    public void testMixedNumberWordToLong() throws ParsingException {
         assertEquals(10, Utils.mixedNumberWordToLong("10"));
         assertEquals(10.5e3, Utils.mixedNumberWordToLong("10.5K"), 0.0);
         assertEquals(10.5e6, Utils.mixedNumberWordToLong("10.5M"), 0.0);
         assertEquals(10.5e6, Utils.mixedNumberWordToLong("10,5M"), 0.0);
         assertEquals(1.5e9, Utils.mixedNumberWordToLong("1,5B"), 0.0);
     }
+
+    @Test
+    public void testJoin() {
+        assertEquals("some,random,stuff", Utils.join(",", Arrays.asList("some", "random", "stuff")));
+    }
 }