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.source.dash.manifest;
  
  import android.support.annotation.Nullable;
  import com.google.android.exoplayer2.C;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Encapsulates media content components over a contiguous period of time.
   */
  public class Period {
  
    /**
     * The period identifier, if one exists.
     */
    @Nullable public final String id;
  
    /**
     * The start time of the period in milliseconds.
     */
    public final long startMs;
  
    /**
     * The adaptation sets belonging to the period.
     */
    public final List<AdaptationSet> adaptationSets;
  
    /**
     * The event stream belonging to the period.
     */
    public final List<EventStream> eventStreams;
  
    /**
     * @param id The period identifier. May be null.
     * @param startMs The start time of the period in milliseconds.
     * @param adaptationSets The adaptation sets belonging to the period.
     */
    public Period(@Nullable String id, long startMs, List<AdaptationSet> adaptationSets) {
      this(id, startMs, adaptationSets, Collections.<EventStream>emptyList());
    }
  
    /**
     * @param id The period identifier. May be null.
     * @param startMs The start time of the period in milliseconds.
     * @param adaptationSets The adaptation sets belonging to the period.
     * @param eventStreams The {@link EventStream}s belonging to the period.
     */
    public Period(@Nullable String id, long startMs, List<AdaptationSet> adaptationSets,
        List<EventStream> eventStreams) {
      this.id = id;
      this.startMs = startMs;
      this.adaptationSets = Collections.unmodifiableList(adaptationSets);
      this.eventStreams = Collections.unmodifiableList(eventStreams);
    }
  
    /**
     * Returns the index of the first adaptation set of a given type, or {@link C#INDEX_UNSET} if no
     * adaptation set of the specified type exists.
     *
     * @param type An adaptation set type.
     * @return The index of the first adaptation set of the specified type, or {@link C#INDEX_UNSET}.
     */
    public int getAdaptationSetIndex(int type) {
      int adaptationCount = adaptationSets.size();
      for (int i = 0; i < adaptationCount; i++) {
        if (adaptationSets.get(i).type == type) {
          return i;
        }
      }
      return C.INDEX_UNSET;
    }
  
  }
  