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/*
* 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");
}
}
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