Implement @TobiGr's suggestions

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

@@ -309,8 +309,9 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
         if (getTextFromObject(videoTab.getObject("content").getObject("sectionListRenderer")
                 .getArray("contents").getObject(0).getObject("itemSectionRenderer")
                 .getArray("contents").getObject(0).getObject("messageRenderer")
-                .getObject("text")).equals("This channel has no videos."))
+                .getObject("text")).equals("This channel has no videos.")) {
             return null;
+        }
 
         this.videoTab = videoTab;
         return videoTab;

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

@@ -5,7 +5,6 @@ import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
 import com.grack.nanojson.JsonParserException;
 import com.grack.nanojson.JsonWriter;
-
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
@@ -20,18 +19,17 @@ import org.schabi.newpipe.extractor.search.SearchExtractor;
 import org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper;
 import org.schabi.newpipe.extractor.utils.Utils;
 
+import javax.annotation.Nonnull;
 import java.io.IOException;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import javax.annotation.Nonnull;
-
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.fixThumbnailUrl;
-import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getValidJsonResponseBody;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getTextFromObject;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getUrlFromNavigationEndpoint;
+import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getValidJsonResponseBody;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.MUSIC_ALBUMS;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.MUSIC_ARTISTS;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.MUSIC_PLAYLISTS;
@@ -251,7 +249,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                         public String getName() throws ParsingException {
                             final String name = getTextFromObject(info.getArray("flexColumns").getObject(0)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (name != null && !name.isEmpty()) {
+                            if (!name.isEmpty()) {
                                 return name;
                             }
                             throw new ParsingException("Could not get name");
@@ -261,7 +259,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                         public long getDuration() throws ParsingException {
                             final String duration = getTextFromObject(info.getArray("flexColumns").getObject(3)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (duration != null && !duration.isEmpty()) {
+                            if (!duration.isEmpty()) {
                                 return YoutubeParsingHelper.parseDurationString(duration);
                             }
                             throw new ParsingException("Could not get duration");
@@ -271,7 +269,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                         public String getUploaderName() throws ParsingException {
                             final String name = getTextFromObject(info.getArray("flexColumns").getObject(1)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (name != null && !name.isEmpty()) {
+                            if (!name.isEmpty()) {
                                 return name;
                             }
                             throw new ParsingException("Could not get uploader name");
@@ -294,7 +292,13 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                                         .getObject(1).getObject("musicResponsiveListItemFlexColumnRenderer")
                                         .getObject("text").getArray("runs").getObject(0).getObject("navigationEndpoint");
 
-                                return getUrlFromNavigationEndpoint(navigationEndpoint);
+                                final String url = getUrlFromNavigationEndpoint(navigationEndpoint);
+
+                                if (url != null && !url.isEmpty()) {
+                                    return url;
+                                }
+
+                                throw new ParsingException("Could not get uploader URL");
                             }
                         }
 
@@ -315,7 +319,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                             }
                             final String viewCount = getTextFromObject(info.getArray("flexColumns").getObject(2)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (viewCount != null && !viewCount.isEmpty()) {
+                            if (!viewCount.isEmpty()) {
                                 return Utils.mixedNumberWordToLong(viewCount);
                             }
                             throw new ParsingException("Could not get view count");
@@ -355,7 +359,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                         public String getName() throws ParsingException {
                             final String name = getTextFromObject(info.getArray("flexColumns").getObject(0)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (name != null && !name.isEmpty()) {
+                            if (!name.isEmpty()) {
                                 return name;
                             }
                             throw new ParsingException("Could not get name");
@@ -374,7 +378,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                         public long getSubscriberCount() throws ParsingException {
                             final String viewCount = getTextFromObject(info.getArray("flexColumns").getObject(2)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (viewCount != null && !viewCount.isEmpty()) {
+                            if (!viewCount.isEmpty()) {
                                 return Utils.mixedNumberWordToLong(viewCount);
                             }
                             throw new ParsingException("Could not get subscriber count");
@@ -410,7 +414,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                         public String getName() throws ParsingException {
                             final String name = getTextFromObject(info.getArray("flexColumns").getObject(0)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (name != null && !name.isEmpty()) {
+                            if (!name.isEmpty()) {
                                 return name;
                             }
                             throw new ParsingException("Could not get name");
@@ -435,7 +439,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                                 name = getTextFromObject(info.getArray("flexColumns").getObject(1)
                                         .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
                             }
-                            if (name != null && !name.isEmpty()) {
+                            if (!name.isEmpty()) {
                                 return name;
                             }
                             throw new ParsingException("Could not get uploader name");
@@ -448,7 +452,7 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
                             }
                             final String count = getTextFromObject(info.getArray("flexColumns").getObject(2)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
-                            if (count != null && !count.isEmpty()) {
+                            if (!count.isEmpty()) {
                                 if (count.contains("100+")) {
                                     return ITEM_COUNT_MORE_THAN_100;
                                 } else {

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

@@ -2,7 +2,6 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
-
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -15,9 +14,8 @@ 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 javax.annotation.Nonnull;
+import java.io.IOException;
 
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.fixThumbnailUrl;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getJsonResponse;
@@ -83,7 +81,7 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
     @Override
     public String getName() throws ParsingException {
         String name = getTextFromObject(playlistInfo.getObject("title"));
-        if (name == null || !name.isEmpty()) return name;
+        if (!name.isEmpty()) return name;
 
         return initialData.getObject("microformat").getObject("microformatDataRenderer").getString("title");
     }

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

@@ -3,7 +3,6 @@ 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.mozilla.javascript.Context;
 import org.mozilla.javascript.Function;
 import org.mozilla.javascript.ScriptableObject;
@@ -33,10 +32,11 @@ import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 import org.schabi.newpipe.extractor.stream.StreamType;
 import org.schabi.newpipe.extractor.stream.SubtitlesStream;
 import org.schabi.newpipe.extractor.stream.VideoStream;
-import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Parser;
 import org.schabi.newpipe.extractor.utils.Utils;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.text.SimpleDateFormat;
@@ -50,9 +50,6 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.fixThumbnailUrl;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getJsonResponse;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getTextFromObject;
@@ -120,7 +117,7 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         assertPageFetched();
         String title = getTextFromObject(getVideoPrimaryInfoRenderer().getObject("title"));
 
-        if (title == null || title.isEmpty()) {
+        if (title.isEmpty()) {
             title = playerResponse.getObject("videoDetails").getString("title");
 
             if (title == null || title.isEmpty()) throw new ParsingException("Could not get name");
@@ -200,7 +197,7 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         assertPageFetched();
         // description with more info on links
         String description = getTextFromObject(getVideoSecondaryInfoRenderer().getObject("description"), true);
-        if (description != null && !description.isEmpty()) return new Description(description, Description.HTML);
+        if (!description.isEmpty()) return new Description(description, Description.HTML);
 
         // raw non-html description
         return new Description(playerResponse.getObject("videoDetails").getString("shortDescription"), Description.PLAIN_TEXT);
@@ -252,7 +249,7 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         String views = getTextFromObject(getVideoPrimaryInfoRenderer().getObject("viewCount")
                     .getObject("videoViewCountRenderer").getObject("viewCount"));
 
-        if (views == null || views.isEmpty()) {
+        if (views.isEmpty()) {
             views = playerResponse.getObject("videoDetails").getString("viewCount");
 
             if (views == null || views.isEmpty()) throw new ParsingException("Could not get view count");
@@ -333,7 +330,7 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         String uploaderName = getTextFromObject(getVideoSecondaryInfoRenderer().getObject("owner")
                     .getObject("videoOwnerRenderer").getObject("title"));
 
-        if (uploaderName == null || uploaderName.isEmpty()) {
+        if (uploaderName.isEmpty()) {
             uploaderName = playerResponse.getObject("videoDetails").getString("author");
 
             if (uploaderName == null || uploaderName.isEmpty()) throw new ParsingException("Could not get uploader name");

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

@@ -93,7 +93,7 @@ public class YoutubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
     @Override
     public String getName() throws ParsingException {
         String name = getTextFromObject(videoInfo.getObject("title"));
-        if (name == null || !name.isEmpty()) return name;
+        if (!name.isEmpty()) return name;
         throw new ParsingException("Could not get name");
     }
 
@@ -105,7 +105,7 @@ public class YoutubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
 
         String duration = getTextFromObject(videoInfo.getObject("lengthText"));
 
-        if (duration == null || duration.isEmpty()) {
+        if (duration.isEmpty()) {
             for (Object thumbnailOverlay : videoInfo.getArray("thumbnailOverlays")) {
                 if (((JsonObject) thumbnailOverlay).has("thumbnailOverlayTimeStatusRenderer")) {
                     duration = getTextFromObject(((JsonObject) thumbnailOverlay)
@@ -113,7 +113,7 @@ public class YoutubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
                 }
             }
 
-            if (duration == null || duration.isEmpty()) throw new ParsingException("Could not get duration");
+            if (duration.isEmpty()) throw new ParsingException("Could not get duration");
         }
 
         return YoutubeParsingHelper.parseDurationString(duration);
@@ -123,13 +123,13 @@ public class YoutubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
     public String getUploaderName() throws ParsingException {
         String name = getTextFromObject(videoInfo.getObject("longBylineText"));
 
-        if (name == null || name.isEmpty()) {
+        if (name.isEmpty()) {
             name = getTextFromObject(videoInfo.getObject("ownerText"));
 
-            if (name == null || name.isEmpty()) {
+            if (name.isEmpty()) {
                 name = getTextFromObject(videoInfo.getObject("shortBylineText"));
 
-                if (name == null || name.isEmpty()) throw new ParsingException("Could not get uploader name");
+                if (name.isEmpty()) throw new ParsingException("Could not get uploader name");
             }
         }
 
@@ -169,7 +169,7 @@ public class YoutubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
         }
 
         final String publishedTimeText = getTextFromObject(videoInfo.getObject("publishedTimeText"));
-        if (publishedTimeText != null && !publishedTimeText.isEmpty()) return publishedTimeText;
+        if (!publishedTimeText.isEmpty()) return publishedTimeText;
 
         return null;
     }

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

@@ -22,7 +22,6 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
-
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -33,9 +32,8 @@ import org.schabi.newpipe.extractor.localization.TimeAgoParser;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 
-import java.io.IOException;
-
 import javax.annotation.Nonnull;
+import java.io.IOException;
 
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getJsonResponse;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getTextFromObject;
@@ -72,13 +70,8 @@ public class YoutubeTrendingExtractor extends KioskExtractor<StreamInfoItem> {
     @Nonnull
     @Override
     public String getName() throws ParsingException {
-        String name;
+        String name = getTextFromObject(initialData.getObject("header").getObject("feedTabbedHeaderRenderer").getObject("title"));
-        try {
+        if (!name.isEmpty()) {
-            name = getTextFromObject(initialData.getObject("header").getObject("feedTabbedHeaderRenderer").getObject("title"));
-        } catch (Exception e) {
-            throw new ParsingException("Could not get Trending name", e);
-        }
-        if (name != null && !name.isEmpty()) {
             return name;
         }
         throw new ParsingException("Could not get Trending name");

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/linkHandler/YoutubeParsingHelper.java

@@ -384,6 +384,12 @@ public class YoutubeParsingHelper {
         return null;
     }
 
+    /**
+     * Get the text from a JSON object that has either a simpleText or a runs array.
+     * @param textObject JSON object to get the text from
+     * @param html       whether to return HTML, by parsing the navigationEndpoint
+     * @return text in the JSON object or an empty string
+     */
     public static String getTextFromObject(JsonObject textObject, boolean html) throws ParsingException {
         if (textObject.has("simpleText")) return textObject.getString("simpleText");