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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 java.util.HashMap;
28  import java.util.Map;
29  
30  import org.apache.log4j.LogManager;
31  import org.slf4j.ILoggerFactory;
32  import org.slf4j.Logger;
33  
34  /**
35   * Log4jLoggerFactory is an implementation of {@link ILoggerFactory} returning
36   * the appropriate named {@link Log4jLoggerAdapter} instance.
37   * 
38   * @author Ceki Gülcü
39   */
40  public class Log4jLoggerFactory implements ILoggerFactory {
41  
42    // key: name (String), value: a Log4jLoggerAdapter;
43    Map loggerMap;
44  
45    public Log4jLoggerFactory() {
46      loggerMap = new HashMap();
47    }
48  
49    /*
50     * (non-Javadoc)
51     * 
52     * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
53     */
54    public Logger getLogger(String name) {
55      Logger slf4jLogger = null;
56      // protect against concurrent access of loggerMap
57      synchronized (this) {
58          slf4jLogger = (Logger) loggerMap.get(name);
59        if (slf4jLogger == null) {
60          org.apache.log4j.Logger log4jLogger;
61          if(name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME)) {
62             log4jLogger = LogManager.getRootLogger();
63          } else {
64            log4jLogger = LogManager.getLogger(name);
65          }
66          slf4jLogger = new Log4jLoggerAdapter(log4jLogger);
67          loggerMap.put(name, slf4jLogger);
68        }
69      }
70      return slf4jLogger;
71    }
72  }