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