/ocr/ocrservice/src/com/googlecode/eyesfree/env/Stopwatch.java

 1/*
 2 * Copyright (C) 2011 Google Inc.
 3 *
 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5 * use this file except in compliance with the License. You may obtain a copy of
 6 * the License at
 7 *
 8 * http://www.apache.org/licenses/LICENSE-2.0
 9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17package com.googlecode.eyesfree.env;
18
19import android.os.SystemClock;
20
21/**
22 * An interval timing class. This class does not count time while the device
23 * is in deep sleep.
24 *
25 * @author Sharvil Nanavati
26 */
27public class Stopwatch {
28  private final String name;
29  private long startTime;
30  private long totalTime;
31  private boolean isRunning;
32
33  public Stopwatch() {
34    name = null;
35  }
36
37  public Stopwatch(String name) {
38    this.name = name;
39  }
40
41  public void start() {
42    if (isRunning) {
43      return;
44    }
45
46    startTime = SystemClock.uptimeMillis();
47    isRunning = true;
48  }
49
50  public void stop() {
51    if (!isRunning) {
52      return;
53    }
54
55    long now = SystemClock.uptimeMillis();
56    totalTime += (now - startTime);
57    isRunning = false;
58  }
59
60  public void reset() {
61    startTime = SystemClock.uptimeMillis();
62    totalTime = 0;
63  }
64
65  public boolean isRunning() {
66    return isRunning;
67  }
68
69  public long getElapsedMilliseconds() {
70    if (isRunning) {
71      long now = SystemClock.uptimeMillis();
72      totalTime += (now - startTime);
73      startTime = now;
74    }
75    return totalTime;
76  }
77
78  @Override
79  public String toString() {
80    if (name != null) {
81      return "[" + name + ": " + totalTime + "ms]";
82    }
83
84    return totalTime + "ms";
85  }
86}