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Java > Open Source Codes > org > slf4j > impl > Log4jLoggerFactory


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.apache.log4j.LogManager;
40 import org.slf4j.ILoggerFactory;
41 import org.slf4j.Logger;
42
43 /**
44  * Log4jLoggerFactory is an implementation of {@link ILoggerFactory} returning
45  * the appropriate named {@link Log4jLoggerAdapter} instance.
46  *
47  * @author Ceki Gülcü
48  */
49 public class Log4jLoggerFactory implements ILoggerFactory {
50
51   // key: name (String), value: a Log4jLoggerAdapter;
52 Map JavaDoc loggerMap;
53
54   public Log4jLoggerFactory() {
55     loggerMap = new HashMap JavaDoc();
56   }
57
58   /*
59    * (non-Javadoc)
60    *
61    * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
62    */
63   public Logger getLogger(String JavaDoc name) {
64     Logger slf4jLogger = null;
65     // protect against concurrent access of loggerMap
66 synchronized (this) {
67         slf4jLogger = (Logger) loggerMap.get(name);
68       if (slf4jLogger == null) {
69         org.apache.log4j.Logger log4jLogger;
70         if(name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME)) {
71            log4jLogger = LogManager.getRootLogger();
72         } else {
73           log4jLogger = LogManager.getLogger(name);
74         }
75         slf4jLogger = new Log4jLoggerAdapter(log4jLogger);
76         loggerMap.put(name, slf4jLogger);
77       }
78     }
79     return slf4jLogger;
80   }
81 }
82
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