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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.helpers;
26  
27  import java.util.ArrayList;
28  import java.util.List;
29  
30  import org.slf4j.ILoggerFactory;
31  import org.slf4j.Logger;
32  
33  /**
34   * SubstituteLoggerFactory is an trivial implementation of
35   * {@link ILoggerFactory} which always returns the unique instance of NOPLogger.
36   * 
37   * <p>
38   * It used as a temporary substitute for the real ILoggerFactory during its
39   * auto-configuration which may re-enter LoggerFactory to obtain logger
40   * instances. See also http://bugzilla.slf4j.org/show_bug.cgi?id=106
41   * 
42   * @author Ceki G&uuml;lc&uuml;
43   */
44  public class SubstituteLoggerFactory implements ILoggerFactory {
45  
46    // keep a record of requested logger names
47    final List loggerNameList = new ArrayList();
48  
49    public Logger getLogger(String name) {
50      synchronized (loggerNameList) {
51        loggerNameList.add(name);
52      }
53      return NOPLogger.NOP_LOGGER;
54    }
55  
56    public List getLoggerNameList() {
57      List copy = new ArrayList();
58      synchronized (loggerNameList) {
59        copy.addAll(loggerNameList);
60      }
61      return copy;
62    }
63  
64  }