-Added ability to save playlist as remote playlist link rather than storing it in database.

-Added LeakCanary as part of debug build.
-Modified bookmark list to show both remote and local playlists.
-Removed ability to save channel items as local playlist, in favor of subscribe.

app/src/main/java/org/schabi/newpipe/database/AppDatabase.java

@@ -9,8 +9,10 @@ import org.schabi.newpipe.database.history.dao.StreamHistoryDAO;
 import org.schabi.newpipe.database.history.model.SearchHistoryEntry;
 import org.schabi.newpipe.database.history.model.StreamHistoryEntity;
 import org.schabi.newpipe.database.playlist.dao.PlaylistDAO;
+import org.schabi.newpipe.database.playlist.dao.PlaylistRemoteDAO;
 import org.schabi.newpipe.database.playlist.dao.PlaylistStreamDAO;
 import org.schabi.newpipe.database.playlist.model.PlaylistEntity;
+import org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity;
 import org.schabi.newpipe.database.playlist.model.PlaylistStreamEntity;
 import org.schabi.newpipe.database.stream.dao.StreamDAO;
 import org.schabi.newpipe.database.stream.dao.StreamStateDAO;
@@ -26,7 +28,7 @@ import static org.schabi.newpipe.database.Migrations.DB_VER_12_0;
         entities = {
                 SubscriptionEntity.class, SearchHistoryEntry.class,
                 StreamEntity.class, StreamHistoryEntity.class, StreamStateEntity.class,
-                PlaylistEntity.class, PlaylistStreamEntity.class
+                PlaylistEntity.class, PlaylistStreamEntity.class, PlaylistRemoteEntity.class
         },
         version = DB_VER_12_0,
         exportSchema = false
@@ -48,4 +50,6 @@ public abstract class AppDatabase extends RoomDatabase {
     public abstract PlaylistDAO playlistDAO();
 
     public abstract PlaylistStreamDAO playlistStreamDAO();
+
+    public abstract PlaylistRemoteDAO playlistRemoteDAO();
 }

app/src/main/java/org/schabi/newpipe/database/LocalItem.java

@@ -2,9 +2,11 @@ package org.schabi.newpipe.database;
 
 public interface LocalItem {
     enum LocalItemType {
-        PLAYLIST_ITEM,
+        PLAYLIST_LOCAL_ITEM,
+        PLAYLIST_REMOTE_ITEM,
+
         PLAYLIST_STREAM_ITEM,
-        STATISTIC_STREAM_ITEM
+        STATISTIC_STREAM_ITEM,
     }
 
     LocalItemType getLocalItemType();

app/src/main/java/org/schabi/newpipe/database/playlist/PlaylistLocalItem.java

@@ -0,0 +1,7 @@
+package org.schabi.newpipe.database.playlist;
+
+import org.schabi.newpipe.database.LocalItem;
+
+public interface PlaylistLocalItem extends LocalItem {
+    String getOrderingName();
+}

app/src/main/java/org/schabi/newpipe/database/playlist/PlaylistMetadataEntry.java

@@ -2,13 +2,11 @@ package org.schabi.newpipe.database.playlist;
 
 import android.arch.persistence.room.ColumnInfo;
 
-import org.schabi.newpipe.database.LocalItem;
-
 import static org.schabi.newpipe.database.playlist.model.PlaylistEntity.PLAYLIST_ID;
 import static org.schabi.newpipe.database.playlist.model.PlaylistEntity.PLAYLIST_NAME;
 import static org.schabi.newpipe.database.playlist.model.PlaylistEntity.PLAYLIST_THUMBNAIL_URL;
 
-public class PlaylistMetadataEntry implements LocalItem {
+public class PlaylistMetadataEntry implements PlaylistLocalItem {
     final public static String PLAYLIST_STREAM_COUNT = "streamCount";
 
     @ColumnInfo(name = PLAYLIST_ID)
@@ -29,6 +27,11 @@ public class PlaylistMetadataEntry implements LocalItem {
 
     @Override
     public LocalItemType getLocalItemType() {
-        return LocalItemType.PLAYLIST_ITEM;
+        return LocalItemType.PLAYLIST_LOCAL_ITEM;
+    }
+
+    @Override
+    public String getOrderingName() {
+        return name;
     }
 }

app/src/main/java/org/schabi/newpipe/database/playlist/dao/PlaylistRemoteDAO.java

@@ -0,0 +1,60 @@
+package org.schabi.newpipe.database.playlist.dao;
+
+import android.arch.persistence.room.Dao;
+import android.arch.persistence.room.Query;
+import android.arch.persistence.room.Transaction;
+
+import org.schabi.newpipe.database.BasicDAO;
+import org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity;
+
+import java.util.List;
+
+import io.reactivex.Flowable;
+
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_ID;
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_SERVICE_ID;
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_TABLE;
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_URL;
+
+@Dao
+public abstract class PlaylistRemoteDAO implements BasicDAO<PlaylistRemoteEntity> {
+    @Override
+    @Query("SELECT * FROM " + REMOTE_PLAYLIST_TABLE)
+    public abstract Flowable<List<PlaylistRemoteEntity>> getAll();
+
+    @Override
+    @Query("DELETE FROM " + REMOTE_PLAYLIST_TABLE)
+    public abstract int deleteAll();
+
+    @Override
+    @Query("SELECT * FROM " + REMOTE_PLAYLIST_TABLE +
+            " WHERE " + REMOTE_PLAYLIST_SERVICE_ID + " = :serviceId")
+    public abstract Flowable<List<PlaylistRemoteEntity>> listByService(int serviceId);
+
+    @Query("SELECT * FROM " + REMOTE_PLAYLIST_TABLE + " WHERE " +
+            REMOTE_PLAYLIST_URL + " = :url AND " +
+            REMOTE_PLAYLIST_SERVICE_ID + " = :serviceId")
+    public abstract Flowable<List<PlaylistRemoteEntity>> getPlaylist(long serviceId, String url);
+
+    @Query("SELECT " + REMOTE_PLAYLIST_ID + " FROM " + REMOTE_PLAYLIST_TABLE +
+            " WHERE " +
+            REMOTE_PLAYLIST_URL + " = :url AND " + REMOTE_PLAYLIST_SERVICE_ID + " = :serviceId")
+    abstract Long getPlaylistIdInternal(long serviceId, String url);
+
+    @Transaction
+    public long upsert(PlaylistRemoteEntity playlist) {
+        final Long playlistId = getPlaylistIdInternal(playlist.getServiceId(), playlist.getUrl());
+
+        if (playlistId == null) {
+            return insert(playlist);
+        } else {
+            playlist.setUid(playlistId);
+            update(playlist);
+            return playlistId;
+        }
+    }
+
+    @Query("DELETE FROM " + REMOTE_PLAYLIST_TABLE +
+            " WHERE " + REMOTE_PLAYLIST_ID + " = :playlistId")
+    public abstract int deletePlaylist(final long playlistId);
+}

app/src/main/java/org/schabi/newpipe/database/playlist/model/PlaylistRemoteEntity.java

@@ -0,0 +1,138 @@
+package org.schabi.newpipe.database.playlist.model;
+
+import android.arch.persistence.room.ColumnInfo;
+import android.arch.persistence.room.Entity;
+import android.arch.persistence.room.Ignore;
+import android.arch.persistence.room.Index;
+import android.arch.persistence.room.PrimaryKey;
+
+import org.schabi.newpipe.database.LocalItem;
+import org.schabi.newpipe.database.playlist.PlaylistLocalItem;
+import org.schabi.newpipe.extractor.playlist.PlaylistInfo;
+import org.schabi.newpipe.util.Constants;
+
+import static org.schabi.newpipe.database.LocalItem.LocalItemType.PLAYLIST_REMOTE_ITEM;
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_NAME;
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_SERVICE_ID;
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_TABLE;
+import static org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity.REMOTE_PLAYLIST_URL;
+
+@Entity(tableName = REMOTE_PLAYLIST_TABLE,
+        indices = {
+                @Index(value = {REMOTE_PLAYLIST_NAME}),
+                @Index(value = {REMOTE_PLAYLIST_SERVICE_ID, REMOTE_PLAYLIST_URL}, unique = true)
+        })
+public class PlaylistRemoteEntity implements PlaylistLocalItem {
+    final public static String REMOTE_PLAYLIST_TABLE         = "remote_playlists";
+    final public static String REMOTE_PLAYLIST_ID            = "uid";
+    final public static String REMOTE_PLAYLIST_SERVICE_ID    = "service_id";
+    final public static String REMOTE_PLAYLIST_NAME          = "name";
+    final public static String REMOTE_PLAYLIST_URL           = "url";
+    final public static String REMOTE_PLAYLIST_THUMBNAIL_URL = "thumbnail_url";
+    final public static String REMOTE_PLAYLIST_UPLOADER_NAME = "uploader";
+    final public static String REMOTE_PLAYLIST_STREAM_COUNT  = "stream_count";
+
+    @PrimaryKey(autoGenerate = true)
+    @ColumnInfo(name = REMOTE_PLAYLIST_ID)
+    private long uid = 0;
+
+    @ColumnInfo(name = REMOTE_PLAYLIST_SERVICE_ID)
+    private int serviceId = Constants.NO_SERVICE_ID;
+
+    @ColumnInfo(name = REMOTE_PLAYLIST_NAME)
+    private String name;
+
+    @ColumnInfo(name = REMOTE_PLAYLIST_URL)
+    private String url;
+
+    @ColumnInfo(name = REMOTE_PLAYLIST_THUMBNAIL_URL)
+    private String thumbnailUrl;
+
+    @ColumnInfo(name = REMOTE_PLAYLIST_UPLOADER_NAME)
+    private String uploader;
+
+    @ColumnInfo(name = REMOTE_PLAYLIST_STREAM_COUNT)
+    private Long streamCount;
+
+    public PlaylistRemoteEntity(int serviceId, String name, String url, String thumbnailUrl,
+                                String uploader, Long streamCount) {
+        this.serviceId = serviceId;
+        this.name = name;
+        this.url = url;
+        this.thumbnailUrl = thumbnailUrl;
+        this.uploader = uploader;
+        this.streamCount = streamCount;
+    }
+
+    @Ignore
+    public PlaylistRemoteEntity(final PlaylistInfo info) {
+        this(info.getServiceId(), info.getName(), info.getUrl(), info.getThumbnailUrl(),
+                info.getUploaderName(), info.getStreamCount());
+    }
+
+    public long getUid() {
+        return uid;
+    }
+
+    public void setUid(long uid) {
+        this.uid = uid;
+    }
+
+    public int getServiceId() {
+        return serviceId;
+    }
+
+    public void setServiceId(int serviceId) {
+        this.serviceId = serviceId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getThumbnailUrl() {
+        return thumbnailUrl;
+    }
+
+    public void setThumbnailUrl(String thumbnailUrl) {
+        this.thumbnailUrl = thumbnailUrl;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public String getUploader() {
+        return uploader;
+    }
+
+    public void setUploader(String uploader) {
+        this.uploader = uploader;
+    }
+
+    public Long getStreamCount() {
+        return streamCount;
+    }
+
+    public void setStreamCount(Long streamCount) {
+        this.streamCount = streamCount;
+    }
+
+    @Override
+    public LocalItemType getLocalItemType() {
+        return PLAYLIST_REMOTE_ITEM;
+    }
+
+    @Override
+    public String getOrderingName() {
+        return name;
+    }
+}