content: /*
   * Copyright (C) 2018 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.google.android.exoplayer2.source.hls.playlist;
  
  import androidx.annotation.Nullable;
  import com.google.android.exoplayer2.offline.FilteringManifestParser;
  import com.google.android.exoplayer2.offline.StreamKey;
  import com.google.android.exoplayer2.upstream.ParsingLoadable;
  import java.util.List;
  
  /**
   * A {@link HlsPlaylistParserFactory} that includes only the streams identified by the given stream
   * keys.
   */
  public final class FilteringHlsPlaylistParserFactory implements HlsPlaylistParserFactory {
  
    private final HlsPlaylistParserFactory hlsPlaylistParserFactory;
    private final List<StreamKey> streamKeys;
  
    /**
     * @param hlsPlaylistParserFactory A factory for the parsers of the playlists which will be
     *     filtered.
     * @param streamKeys The stream keys. If null or empty then filtering will not occur.
     */
    public FilteringHlsPlaylistParserFactory(
        HlsPlaylistParserFactory hlsPlaylistParserFactory, List<StreamKey> streamKeys) {
      this.hlsPlaylistParserFactory = hlsPlaylistParserFactory;
      this.streamKeys = streamKeys;
    }
  
    @Override
    public ParsingLoadable.Parser<HlsPlaylist> createPlaylistParser() {
      return new FilteringManifestParser<>(
          hlsPlaylistParserFactory.createPlaylistParser(), streamKeys);
    }
  
    @Override
    public ParsingLoadable.Parser<HlsPlaylist> createPlaylistParser(
        HlsMultivariantPlaylist multivariantPlaylist,
        @Nullable HlsMediaPlaylist previousMediaPlaylist) {
      return new FilteringManifestParser<>(
          hlsPlaylistParserFactory.createPlaylistParser(multivariantPlaylist, previousMediaPlaylist),
          streamKeys);
    }
  }
  