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;
37  import java.util.Map;
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 loggerMap;
53  
54    public SimpleLoggerFactory() {
55      loggerMap = new HashMap();
56    }
57  
58    /**
59     * Return an appropriate {@link SimpleLogger} instance by name.
60     */
61    public Logger getLogger(String 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  }