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/*
* Copyright (C) 2016 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.net.util;
import android.os.SystemClock;
/**
* @hide
*/
public class Stopwatch {
private long mStartTimeNs;
private long mStopTimeNs;
public boolean isStarted() {
return (mStartTimeNs > 0);
}
public boolean isStopped() {
return (mStopTimeNs > 0);
}
public boolean isRunning() {
return (isStarted() && !isStopped());
}
/**
* Start the Stopwatch.
*/
public Stopwatch start() {
if (!isStarted()) {
mStartTimeNs = SystemClock.elapsedRealtimeNanos();
}
return this;
}
/**
* Restart the Stopwatch.
*/
public Stopwatch restart() {
mStartTimeNs = SystemClock.elapsedRealtimeNanos();
mStopTimeNs = 0;
return this;
}
/**
* Stop the Stopwatch.
* @return the total time recorded, in microseconds, or 0 if not started.
*/
public long stop() {
if (isRunning()) {
mStopTimeNs = SystemClock.elapsedRealtimeNanos();
}
// Return either the delta after having stopped, or 0.
return (mStopTimeNs - mStartTimeNs) / 1000;
}
/**
* Return the total time recorded to date, in microseconds.
* If the Stopwatch is not running, returns the same value as stop(),
* i.e. either the total time recorded before stopping or 0.
*/
public long lap() {
if (isRunning()) {
return (SystemClock.elapsedRealtimeNanos() - mStartTimeNs) / 1000;
} else {
return stop();
}
}
/**
* Reset the Stopwatch. It will be stopped when this method returns.
*/
public void reset() {
mStartTimeNs = 0;
mStopTimeNs = 0;
}
}
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