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Java > Open Source Codes > org > slf4j > impl > SimpleLoggerFactory


1 /*
2  * Copyright (c) 2004-2005 SLF4J.ORG
3  * Copyright (c) 2004-2005 QOS.ch
4  *
5  * All rights reserved.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining
8  * a copy of this software and associated documentation files (the
9  * "Software"), to deal in the Software without restriction, including
10  * without limitation the rights to use, copy, modify, merge, publish,
11  * distribute, and/or sell copies of the Software, and to permit persons
12  * to whom the Software is furnished to do so, provided that the above
13  * copyright notice(s) and this permission notice appear in all copies of
14  * the Software and that both the above copyright notice(s) and this
15  * permission notice appear in supporting documentation.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
20  * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
21  * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
22  * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
23  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
24  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
25  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
26  *
27  * Except as contained in this notice, the name of a copyright holder
28  * shall not be used in advertising or otherwise to promote the sale, use
29  * or other dealings in this Software without prior written authorization
30  * of the copyright holder.
31  *
32  */
33
34 package org.slf4j.impl;
35
36 import java.util.HashMap JavaDoc;
37 import java.util.Map JavaDoc;
38
39 import org.slf4j.Logger;
40 import org.slf4j.ILoggerFactory;
41
42 /**
43  * An implementation of {@link ILoggerFactory} which always returns
44  * {@link SimpleLogger} instances.
45  *
46  * @author Ceki Gülcü
47  */
48 public class SimpleLoggerFactory implements ILoggerFactory {
49
50   final static SimpleLoggerFactory INSTANCE = new SimpleLoggerFactory();
51
52   Map JavaDoc loggerMap;
53
54   public SimpleLoggerFactory() {
55     loggerMap = new HashMap JavaDoc();
56   }
57
58   /**
59    * Return an appropriate {@link SimpleLogger} instance by name.
60    */
61   public Logger getLogger(String JavaDoc name) {
62     Logger slogger = null;
63     // protect against concurrent access of the loggerMap
64 synchronized (this) {
65       slogger = (Logger) loggerMap.get(name);
66       if (slogger == null) {
67         slogger = new SimpleLogger(name);
68         loggerMap.put(name, slogger);
69       }
70     }
71     return slogger;
72   }
73 }
74
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