[Mix] Add type to playlists & playlist items, to distinguish mixes

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

@@ -49,4 +49,8 @@ public abstract class PlaylistExtractor extends ListExtractor<StreamInfoItem> {
     public String getSubChannelAvatarUrl() throws ParsingException {
         return EMPTY_STRING;
     }
+
+    public PlaylistInfo.PlaylistType getPlaylistType() throws ParsingException {
+        return PlaylistInfo.PlaylistType.NORMAL;
+    }
 }

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

@@ -17,6 +17,41 @@ import java.util.List;
 
 public class PlaylistInfo extends ListInfo<StreamInfoItem> {
 
+    /**
+     * Mixes are handled as particular playlists in NewPipeExtractor. {@link PlaylistType#NORMAL} is
+     * for non-mixes, while other values are for the different types of mixes. The type of a mix
+     * depends on how its contents are autogenerated.
+     */
+    public enum PlaylistType {
+        /**
+         * A normal playlist (not a mix)
+         */
+        NORMAL,
+
+        /**
+         * A mix made only of streams related to a particular stream, for example YouTube mixes
+         */
+        MIX_STREAM,
+
+        /**
+         * A mix made only of music streams related to a particular stream, for example YouTube
+         * music mixes
+         */
+        MIX_MUSIC,
+
+        /**
+         * A mix made only of streams from (or related to) the same channel, for example YouTube
+         * channel mixes
+         */
+        MIX_CHANNEL,
+
+        /**
+         * A mix made only of streams related to a particular (musical) genre, for example YouTube
+         * genre mixes
+         */
+        MIX_GENRE,
+    }
+
     private PlaylistInfo(int serviceId, ListLinkHandler linkHandler, String name) throws ParsingException {
         super(serviceId, linkHandler, name);
     }
@@ -105,6 +140,11 @@ public class PlaylistInfo extends ListInfo<StreamInfoItem> {
         } catch (Exception e) {
             info.addError(e);
         }
+        try {
+            info.setPlaylistType(extractor.getPlaylistType());
+        } catch (Exception e) {
+            info.addError(e);
+        }
         // do not fail if everything but the uploader infos could be collected
         if (!uploaderParsingErrors.isEmpty() &&
                 (!info.getErrors().isEmpty() || uploaderParsingErrors.size() < 3)) {
@@ -127,6 +167,7 @@ public class PlaylistInfo extends ListInfo<StreamInfoItem> {
     private String subChannelName;
     private String subChannelAvatarUrl;
     private long streamCount = 0;
+    private PlaylistType playlistType;
 
     public String getThumbnailUrl() {
         return thumbnailUrl;
@@ -199,4 +240,12 @@ public class PlaylistInfo extends ListInfo<StreamInfoItem> {
     public void setStreamCount(long streamCount) {
         this.streamCount = streamCount;
     }
+
+    public PlaylistType getPlaylistType() {
+        return playlistType;
+    }
+
+    public void setPlaylistType(final PlaylistType playlistType) {
+        this.playlistType = playlistType;
+    }
 }

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

@@ -9,6 +9,7 @@ public class PlaylistInfoItem extends InfoItem {
      * How many streams this playlist have
      */
     private long streamCount = 0;
+    private PlaylistInfo.PlaylistType playlistType;
 
     public PlaylistInfoItem(int serviceId, String url, String name) {
         super(InfoType.PLAYLIST, serviceId, url, name);
@@ -29,4 +30,12 @@ public class PlaylistInfoItem extends InfoItem {
     public void setStreamCount(long stream_count) {
         this.streamCount = stream_count;
     }
+
+    public PlaylistInfo.PlaylistType getPlaylistType() {
+        return playlistType;
+    }
+
+    public void setPlaylistType(final PlaylistInfo.PlaylistType playlistType) {
+        this.playlistType = playlistType;
+    }
 }

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

@@ -3,6 +3,8 @@ package org.schabi.newpipe.extractor.playlist;
 import org.schabi.newpipe.extractor.InfoItemExtractor;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 
+import javax.annotation.Nonnull;
+
 public interface PlaylistInfoItemExtractor extends InfoItemExtractor {
 
     /**
@@ -18,4 +20,13 @@ public interface PlaylistInfoItemExtractor extends InfoItemExtractor {
      * @throws ParsingException
      */
     long getStreamCount() throws ParsingException;
+
+    /**
+     * @return the type of this playlist, see {@link PlaylistInfo.PlaylistType} for a description
+     *         of types. If not overridden always returns {@link PlaylistInfo.PlaylistType#NORMAL}.
+     */
+    @Nonnull
+    default PlaylistInfo.PlaylistType getPlaylistType() throws ParsingException {
+        return PlaylistInfo.PlaylistType.NORMAL;
+    }
 }

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

@@ -33,6 +33,11 @@ public class PlaylistInfoItemsCollector extends InfoItemsCollector<PlaylistInfoI
         } catch (Exception e) {
             addError(e);
         }
+        try {
+            resultItem.setPlaylistType(extractor.getPlaylistType());
+        } catch (Exception e) {
+            addError(e);
+        }
         return resultItem;
     }
 }