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1   /**
2    * Copyright (c) 2004-2011 QOS.ch
3    * All rights reserved.
4    *
5    * Permission is hereby granted, free  of charge, to any person obtaining
6    * a  copy  of this  software  and  associated  documentation files  (the
7    * "Software"), to  deal in  the Software without  restriction, including
8    * without limitation  the rights to  use, copy, modify,  merge, publish,
9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
10   * permit persons to whom the Software  is furnished to do so, subject to
11   * the following conditions:
12   *
13   * The  above  copyright  notice  and  this permission  notice  shall  be
14   * included in all copies or substantial portions of the Software.
15   *
16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23   *
24   */
25  package org.slf4j.impl;
26  
27  import org.slf4j.ILoggerFactory;
28  import org.slf4j.LoggerFactory;
29  import org.slf4j.spi.LoggerFactoryBinder;
30  
31  /**
32   * The binding of {@link LoggerFactory} class with an actual instance of
33   * {@link ILoggerFactory} is performed using information returned by this class.
34   * 
35   * @author Ceki Gülcü
36   */
37  public class StaticLoggerBinder implements LoggerFactoryBinder {
38  
39    /**
40     * The unique instance of this class.
41     */
42    private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
43  
44    /**
45     * Return the singleton of this class.
46     * 
47     * @return the StaticLoggerBinder singleton
48     */
49    public static final StaticLoggerBinder getSingleton() {
50      return SINGLETON;
51    }
52    
53    /**
54     * Version tag used to check compatibility. The value of this field is
55     * modified with each release. 
56     */ 
57    
58    //to avoid constant folding by the compiler, this field must *not* be final
59    public static String REQUESTED_API_VERSION = "1.6.99";
60    
61    // Binding specific code:
62    private static final String loggerFactoryClassStr = JCLLoggerFactory.class
63        .getName();
64  
65    /**
66     * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
67     * method should always be the same object
68     */
69    private final ILoggerFactory loggerFactory;
70  
71    private StaticLoggerBinder() {
72      // Binding specific code:
73      loggerFactory = new JCLLoggerFactory();
74    }
75  
76    public ILoggerFactory getLoggerFactory() {
77      return loggerFactory;
78    }
79  
80    public String getLoggerFactoryClassStr() {
81      return loggerFactoryClassStr;
82    }
83  }