content: /*
   * Copyright (C) 2016 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.trackselection;
  
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.source.TrackGroup;
  import com.google.android.exoplayer2.util.Assertions;
  
  /**
   * A {@link TrackSelection} consisting of a single track.
   */
  public final class FixedTrackSelection extends BaseTrackSelection {
  
    /**
     * Factory for {@link FixedTrackSelection} instances.
     */
    public static final class Factory implements TrackSelection.Factory {
  
      private final int reason;
      private final Object data;
  
      public Factory() {
        this.reason = C.SELECTION_REASON_UNKNOWN;
        this.data = null;
      }
  
      /**
       * @param reason A reason for the track selection.
       * @param data Optional data associated with the track selection.
       */
      public Factory(int reason, Object data) {
        this.reason = reason;
        this.data = data;
      }
  
      @Override
      public FixedTrackSelection createTrackSelection(TrackGroup group, int... tracks) {
        Assertions.checkArgument(tracks.length == 1);
        return new FixedTrackSelection(group, tracks[0], reason, data);
      }
  
    }
  
    private final int reason;
    private final Object data;
  
    /**
     * @param group The {@link TrackGroup}. Must not be null.
     * @param track The index of the selected track within the {@link TrackGroup}.
     */
    public FixedTrackSelection(TrackGroup group, int track) {
      this(group, track, C.SELECTION_REASON_UNKNOWN, null);
    }
  
    /**
     * @param group The {@link TrackGroup}. Must not be null.
     * @param track The index of the selected track within the {@link TrackGroup}.
     * @param reason A reason for the track selection.
     * @param data Optional data associated with the track selection.
     */
    public FixedTrackSelection(TrackGroup group, int track, int reason, Object data) {
      super(group, track);
      this.reason = reason;
      this.data = data;
    }
  
    @Override
    public void updateSelectedTrack(long playbackPositionUs, long bufferedDurationUs,
        long availableDurationUs) {
      // Do nothing.
    }
  
    @Override
    public int getSelectedIndex() {
      return 0;
    }
  
    @Override
    public int getSelectionReason() {
      return reason;
    }
  
    @Override
    public Object getSelectionData() {
      return data;
    }
  
  }
  