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 org.slf4j.ILoggerFactory;
37  import org.slf4j.LoggerFactory;
38  import org.slf4j.spi.LoggerFactoryBinder;
39  
40  /**
41   * The binding of {@link LoggerFactory} class with an actual instance of
42   * {@link ILoggerFactory} is performed using information returned by this class.
43   * 
44   * @author Ceki Gülcü
45   */
46  public class StaticLoggerBinder implements LoggerFactoryBinder {
47  
48    /**
49     * The unique instance of this class.
50     */
51    private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
52  
53    /**
54     * Return the singleton of this class.
55     * 
56     * @return the StaticLoggerBinder singleton
57     */
58    public static final StaticLoggerBinder getSingleton() {
59      return SINGLETON;
60    }
61    
62    /**
63     * Version tag used to check compatibility. The value of this field is
64     * modified with each release. 
65     */ 
66    
67    //to avoid constant folding by the compiler, this field must *not* be final
68    public static String REQUESTED_API_VERSION = "1.5.6";  
69    
70    // Binding specific code:
71    private static final String loggerFactoryClassStr = JCLLoggerFactory.class
72        .getName();
73  
74    /**
75     * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
76     * method should always be the same object
77     */
78    private final ILoggerFactory loggerFactory;
79  
80    private StaticLoggerBinder() {
81      // Binding specific code:
82      loggerFactory = new JCLLoggerFactory();
83    }
84  
85    public ILoggerFactory getLoggerFactory() {
86      return loggerFactory;
87    }
88  
89    public String getLoggerFactoryClassStr() {
90      return loggerFactoryClassStr;
91    }
92  }