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/*
* Copyright (C) 2015 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 com.android.tv.analytics;
import android.os.SystemClock;
/**
* Times a duration.
*/
public final class DurationTimer {
public static final long TIME_NOT_SET = -1;
private long startTimeMs = TIME_NOT_SET;
/**
* Returns true if the timer is running.
*/
public boolean isRunning() {
return startTimeMs != TIME_NOT_SET;
}
/**
* Start the timer.
*/
public void start() {
startTimeMs = SystemClock.elapsedRealtime();
}
/**
* Returns the current duration in milliseconds or {@link #TIME_NOT_SET} if the timer is not
* running.
*/
public long getDuration() {
return isRunning() ? SystemClock.elapsedRealtime() - startTimeMs : TIME_NOT_SET;
}
/**
* Stops the timer and resets its value to {@link #TIME_NOT_SET}.
*
* @return the current duration in milliseconds or {@link #TIME_NOT_SET} if the timer is not
* running.
*/
public long reset() {
long duration = getDuration();
startTimeMs = TIME_NOT_SET;
return duration;
}
}
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