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 android.os;
  
  import android.util.Log;
  
  import java.time.Clock;
  import java.time.DateTimeException;
  import java.time.ZoneId;
  import java.util.Arrays;
  
  /**
   * Single {@link Clock} that will return the best available time from a set of
   * prioritized {@link Clock} instances.
   * <p>
   * For example, when {@link SystemClock#currentNetworkTimeClock()} isn't able to
   * provide the time, this class could use {@link Clock#systemUTC()} instead.
   *
   * @hide
   */
  public class BestClock extends SimpleClock {
      private static final String TAG = "BestClock";
  
      private final Clock[] clocks;
  
      public BestClock(ZoneId zone, Clock... clocks) {
          super(zone);
          this.clocks = clocks;
      }
  
      @Override
      public long millis() {
          for (Clock clock : clocks) {
              try {
                  return clock.millis();
              } catch (DateTimeException e) {
                  // Ignore and attempt the next clock
                  Log.w(TAG, e.toString());
              }
          }
          throw new DateTimeException(
                  "No clocks in " + Arrays.toString(clocks) + " were able to provide time");
      }
  }
  