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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.Iterator;
29  import java.util.Map;
30  
31  import org.slf4j.spi.MDCAdapter;
32  
33  public class Log4jMDCAdapter implements MDCAdapter {
34  
35    public void clear() {
36      Map map = org.apache.log4j.MDC.getContext();
37      if (map != null) {
38        map.clear();
39      }
40    }
41  
42    public String get(String key) {
43      return (String) org.apache.log4j.MDC.get(key);
44    }
45  
46    /**
47     * Put a context value (the <code>val</code> parameter) as identified with
48     * the <code>key</code> parameter into the current thread's context map. The
49     * <code>key</code> parameter cannot be null. Log4j does <em>not</em> 
50     * support null for the <code>val</code> parameter.
51     * 
52     * <p>
53     * This method delegates all work to log4j's MDC.
54     * 
55     * @throws IllegalArgumentException
56     *           in case the "key" or <b>"val"</b> parameter is null
57     */
58    public void put(String key, String val) {
59      org.apache.log4j.MDC.put(key, val);
60    }
61  
62    public void remove(String key) {
63      org.apache.log4j.MDC.remove(key);
64    }
65  
66    public Map getCopyOfContextMap() {
67      Map old = org.apache.log4j.MDC.getContext();
68      if(old != null) {
69        return new HashMap(old);
70      } else {
71        return null;
72      }
73    }
74  
75    public void setContextMap(Map contextMap) {
76      Map old = org.apache.log4j.MDC.getContext();
77      if(old == null) {
78        Iterator entrySetIterator = contextMap.entrySet().iterator();
79        while(entrySetIterator.hasNext()) {
80          Map.Entry mapEntry = (Map.Entry) entrySetIterator.next();
81          org.apache.log4j.MDC.put((String) mapEntry.getKey(), mapEntry.getValue());
82        }
83      } else {
84        old.clear();
85        old.putAll(contextMap);
86      }
87    }
88  }