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/*
* Copyright 2022 Google LLC
*
* 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.libraries.mobiledatadownload.testing;
import com.google.android.libraries.mobiledatadownload.TimeSource;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/** Fake implementation of {@link TimeSource} for testing. */
public final class FakeTimeSource implements TimeSource {
private final AtomicLong currentMillis = new AtomicLong();
private final AtomicLong elapsedNanos = new AtomicLong();
@Override
public long currentTimeMillis() {
return currentMillis.get();
}
@Override
public long elapsedRealtimeNanos() {
return elapsedNanos.get();
}
/** Advances the current time and returns {@code this}. */
@CanIgnoreReturnValue
public FakeTimeSource advance(long interval, TimeUnit units) {
long millis = units.toMillis(interval);
if (millis < 0) {
throw new IllegalArgumentException("Can't advance negative duration: " + millis);
}
currentMillis.getAndAdd(millis);
long nanos = units.toNanos(interval);
if (nanos < 0) {
throw new IllegalArgumentException("Can't advance negative duration: " + nanos);
}
elapsedNanos.getAndAdd(nanos);
return this;
}
/** Sets the current time and returns {@code this}. */
@CanIgnoreReturnValue
public FakeTimeSource set(long millis) {
if (millis < 0) {
throw new IllegalArgumentException("Can't set before unix epoch:" + millis);
}
currentMillis.set(millis);
return this;
}
/** Sets the elapsed time and returns {@code this}. */
@CanIgnoreReturnValue
public FakeTimeSource setElapsedNanos(long nanos) {
if (nanos < 0) {
throw new IllegalArgumentException("Negative elapsed time: " + nanos);
}
elapsedNanos.set(nanos);
return this;
}
}
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