content: /*
   * Copyright (C) 2022 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.text;
  
  import android.graphics.Bitmap;
  import android.os.Bundle;
  import androidx.annotation.Nullable;
  import com.google.android.exoplayer2.Bundleable;
  import com.google.android.exoplayer2.Timeline;
  import com.google.android.exoplayer2.util.BundleableUtil;
  import com.google.android.exoplayer2.util.Util;
  import com.google.common.collect.ImmutableList;
  import java.util.ArrayList;
  import java.util.List;
  
  /** Class to represent the state of active {@link Cue Cues} at a particular time. */
  public final class CueGroup implements Bundleable {
  
    /** An empty group with no {@link Cue Cues} and presentation time of zero. */
    public static final CueGroup EMPTY_TIME_ZERO =
        new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
  
    /**
     * The cues in this group.
     *
     * <p>This list is in ascending order of priority. If any of the cue boxes overlap when displayed,
     * the {@link Cue} nearer the end of the list should be shown on top.
     *
     * <p>This list may be empty if the group represents a state with no cues.
     */
    public final ImmutableList<Cue> cues;
    /**
     * The presentation time of the {@link #cues}, in microseconds.
     *
     * <p>This time is an offset from the start of the current {@link Timeline.Period}.
     */
    public final long presentationTimeUs;
  
    /** Creates a CueGroup. */
    public CueGroup(List<Cue> cues, long presentationTimeUs) {
      this.cues = ImmutableList.copyOf(cues);
      this.presentationTimeUs = presentationTimeUs;
    }
  
    // Bundleable implementation.
  
    private static final String FIELD_CUES = Util.intToStringMaxRadix(0);
    private static final String FIELD_PRESENTATION_TIME_US = Util.intToStringMaxRadix(1);
  
    @Override
    public Bundle toBundle() {
      Bundle bundle = new Bundle();
      bundle.putParcelableArrayList(
          FIELD_CUES, BundleableUtil.toBundleArrayList(filterOutBitmapCues(cues)));
      bundle.putLong(FIELD_PRESENTATION_TIME_US, presentationTimeUs);
      return bundle;
    }
  
    public static final Creator<CueGroup> CREATOR = CueGroup::fromBundle;
  
    private static final CueGroup fromBundle(Bundle bundle) {
      @Nullable ArrayList<Bundle> cueBundles = bundle.getParcelableArrayList(FIELD_CUES);
      List<Cue> cues =
          cueBundles == null
              ? ImmutableList.of()
              : BundleableUtil.fromBundleList(Cue.CREATOR, cueBundles);
      long presentationTimeUs = bundle.getLong(FIELD_PRESENTATION_TIME_US);
      return new CueGroup(cues, presentationTimeUs);
    }
  
    /**
     * Filters out {@link Cue} objects containing {@link Bitmap}. It is used when transferring cues
     * between processes to prevent transferring too much data.
     */
    private static ImmutableList<Cue> filterOutBitmapCues(List<Cue> cues) {
      ImmutableList.Builder<Cue> builder = ImmutableList.builder();
      for (int i = 0; i < cues.size(); i++) {
        if (cues.get(i).bitmap != null) {
          continue;
        }
        builder.add(cues.get(i));
      }
      return builder.build();
    }
  }
  