| /* |
| * 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"); |
| } |
| } |