001: /*--
002:
003: Copyright (C) 2000-2003 Anthony Eden.
004: All rights reserved.
005:
006: Redistribution and use in source and binary forms, with or without
007: modification, are permitted provided that the following conditions
008: are met:
009:
010: 1. Redistributions of source code must retain the above copyright
011: notice, this list of conditions, and the following disclaimer.
012:
013: 2. Redistributions in binary form must reproduce the above copyright
014: notice, this list of conditions, and the disclaimer that follows
015: these conditions in the documentation and/or other materials
016: provided with the distribution.
017:
018: 3. The name "EdenLib" must not be used to endorse or promote products
019: derived from this software without prior written permission. For
020: written permission, please contact me@anthonyeden.com.
021:
022: 4. Products derived from this software may not be called "EdenLib", nor
023: may "EdenLib" appear in their name, without prior written permission
024: from Anthony Eden (me@anthonyeden.com).
025:
026: In addition, I request (but do not require) that you include in the
027: end-user documentation provided with the redistribution and/or in the
028: software itself an acknowledgement equivalent to the following:
029: "This product includes software developed by
030: Anthony Eden (http://www.anthonyeden.com/)."
031:
032: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
033: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
034: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
035: DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
036: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
037: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
038: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
039: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
040: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
041: IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
042: POSSIBILITY OF SUCH DAMAGE.
043:
044: For more information on EdenLib, please see <http://edenlib.sf.net/>.
045:
046: */
047:
048: package com.anthonyeden.lib.util;
049:
050: /** Simple class for starting and stopping a stopwatch. This class
051: is useful for timing how long a particular block of code takes to
052: execute.
053:
054: @author Anthony Eden
055: */
056:
057: public class Stopwatch {
058:
059: private boolean running = false;
060:
061: private long start = 0;
062: private long end = 0;
063:
064: /** Start the stopwatch.
065:
066: @throws IllegalStateException If the stopwatch is already running
067: */
068:
069: public synchronized void start() {
070: if (running) {
071: throw new IllegalStateException(
072: "Stopwatch is already running");
073: }
074: running = true;
075: start = System.currentTimeMillis();
076: }
077:
078: /** Stop the stopwatch.
079:
080: @throws IllegalStateException If the stopwatch is not running
081: */
082:
083: public synchronized void stop() {
084: if (!running) {
085: throw new IllegalStateException("Stopwatch is not running");
086: }
087: running = false;
088: end = System.currentTimeMillis();
089: }
090:
091: /** Get the elapsed time for the stopwatch in milliseconds.
092:
093: @return The elapsed time in milliseconds
094: @throws IllegalStateException If the stopwatch is running
095: */
096:
097: public long getElapsedTime() {
098: if (running) {
099: throw new IllegalStateException(
100: "Stopwatch is currently running");
101: }
102: return end - start;
103: }
104:
105: }
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