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 
clear()35     public void clear() {
36         @SuppressWarnings("rawtypes")
37         Map map = org.apache.log4j.MDC.getContext();
38         if (map != null) {
39             map.clear();
40         }
41     }
42 
get(String key)43     public String get(String key) {
44         return (String) org.apache.log4j.MDC.get(key);
45     }
46 
47     /**
48      * Put a context value (the <code>val</code> parameter) as identified with
49      * the <code>key</code> parameter into the current thread's context map. The
50      * <code>key</code> parameter cannot be null. Log4j does <em>not</em>
51      * support null for the <code>val</code> parameter.
52      *
53      * <p>
54      * This method delegates all work to log4j's MDC.
55      *
56      * @throws IllegalArgumentException
57      *           in case the "key" or <b>"val"</b> parameter is null
58      */
put(String key, String val)59     public void put(String key, String val) {
60         org.apache.log4j.MDC.put(key, val);
61     }
62 
remove(String key)63     public void remove(String key) {
64         org.apache.log4j.MDC.remove(key);
65     }
66 
67     @SuppressWarnings({ "rawtypes", "unchecked" })
getCopyOfContextMap()68     public Map getCopyOfContextMap() {
69         Map old = org.apache.log4j.MDC.getContext();
70         if (old != null) {
71             return new HashMap(old);
72         } else {
73             return null;
74         }
75     }
76 
77     @SuppressWarnings({ "rawtypes", "unchecked" })
setContextMap(Map contextMap)78     public void setContextMap(Map contextMap) {
79         Map old = org.apache.log4j.MDC.getContext();
80         if (old == null) {
81             Iterator entrySetIterator = contextMap.entrySet().iterator();
82             while (entrySetIterator.hasNext()) {
83                 Map.Entry mapEntry = (Map.Entry) entrySetIterator.next();
84                 org.apache.log4j.MDC.put((String) mapEntry.getKey(), mapEntry.getValue());
85             }
86         } else {
87             old.clear();
88             old.putAll(contextMap);
89         }
90     }
91 }
92