| /* |
| * 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; |
| } |
| } |