[YouTube] Directly use playlist collector in channel tabs wrapper

Note that this introduces a "Raw use of parameterized class 'InfoItemsPage'" warning, but it can be ignored since the type missing would be <InfoItem>, and StreamInfoItem extends InfoItem

Author: Stypox

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

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.extractor.services.youtube.extractors;
 
-import org.schabi.newpipe.extractor.InfoItem;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+
 import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.tabs.ChannelTabExtractor;
@@ -12,14 +13,11 @@
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 import org.schabi.newpipe.extractor.playlist.PlaylistExtractor;
 import org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubePlaylistLinkHandlerFactory;
-import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.List;
 
-import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+import javax.annotation.Nonnull;
 
 /**
  * A {@link ChannelTabExtractor} for YouTube system playlists using a
@@ -74,35 +72,19 @@ public void onFetchPage(@Nonnull final Downloader downloader)
 
     @Nonnull
     @Override
-    public InfoItemsPage<InfoItem> getInitialPage() throws IOException, ExtractionException {
+    public InfoItemsPage getInitialPage() throws IOException, ExtractionException {
         if (!playlistExisting) {
             return InfoItemsPage.emptyPage();
         }
-
-        final InfoItemsPage<StreamInfoItem> playlistInitialPage =
-                playlistExtractorInstance.getInitialPage();
-
-        // We can't provide the playlist page as it is due to a type conflict, we need to wrap the
-        // page items and provide a new InfoItemsPage
-        final List<InfoItem> infoItems = new ArrayList<>(playlistInitialPage.getItems());
-        return new InfoItemsPage<>(infoItems, playlistInitialPage.getNextPage(),
-                playlistInitialPage.getErrors());
+        return playlistExtractorInstance.getInitialPage();
     }
 
     @Override
-    public InfoItemsPage<InfoItem> getPage(final Page page)
-            throws IOException, ExtractionException {
+    public InfoItemsPage getPage(final Page page) throws IOException, ExtractionException {
         if (!playlistExisting) {
             return InfoItemsPage.emptyPage();
         }
-
-        final InfoItemsPage<StreamInfoItem> playlistPage = playlistExtractorInstance.getPage(page);
-
-        // We can't provide the playlist page as it is due to a type conflict, we need to wrap the
-        // page items and provide a new InfoItemsPage
-        final List<InfoItem> infoItems = new ArrayList<>(playlistPage.getItems());
-        return new InfoItemsPage<>(infoItems, playlistPage.getNextPage(),
-                playlistPage.getErrors());
+        return playlistExtractorInstance.getPage(page);
     }
 
     /**