Class Stopwatch

1
2	/*
3	* Copyright (c) 2016 Vivid Solutions.
4	*
5	* All rights reserved. This program and the accompanying materials
6	* are made available under the terms of the Eclipse Public License 2.0
7	* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
8	* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
9	* and the Eclipse Distribution License is available at
10	*
11	* http://www.eclipse.org/org/documents/edl-v10.php.
12	*/
13	package org.locationtech.jts.util;
14
15	/**
16	* Implements a timer function which can compute
17	* elapsed time as well as split times.
18	*
19	* @version 1.7
20	*/
21	public class Stopwatch {
22
23	private long startTimestamp;
24	private long totalTime = 0;
25	private boolean isRunning = false;
26
27	public Stopwatch()
28	{
29	start();
30	}
31
32	public void start()
33	{
34	if (isRunning) return;
35	startTimestamp = System.currentTimeMillis();
36	isRunning = true;
37	}
38
39	public long stop()
40	{
41	if (isRunning) {
42	updateTotalTime();
43	isRunning = false;
44	}
45	return totalTime;
46	}
47
48	public void reset()
49	{
50	totalTime = 0;
51	startTimestamp = System.currentTimeMillis();
52	}
53
54	public long split()
55	{
56	if (isRunning)
57	updateTotalTime();
58	return totalTime;
59	}
60
61	private void updateTotalTime()
62	{
63	long endTimestamp = System.currentTimeMillis();
64	long elapsedTime = endTimestamp - startTimestamp;
65	startTimestamp = endTimestamp;
66	totalTime += elapsedTime;
67	}
68
69	public long getTime()
70	{
71	updateTotalTime();
72	return totalTime;
73	}
74
75	public String getTimeString()
76	{
77	long totalTime = getTime();
78	return getTimeString(totalTime);
79	}
80
81	public static String getTimeString(long timeMillis) {
82	String totalTimeStr = timeMillis < 10000
83	? timeMillis + " ms"
84	: (double) timeMillis / 1000.0 + " s";
85	return totalTimeStr;
86	}
87	}
88