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 */
25package org.slf4j.impl;
26
27import java.util.HashMap;
28import java.util.Iterator;
29import java.util.Map;
30
31import org.slf4j.spi.MDCAdapter;
32
33public class Log4jMDCAdapter implements MDCAdapter {
34
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
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     */
59    public void put(String key, String val) {
60        org.apache.log4j.MDC.put(key, val);
61    }
62
63    public void remove(String key) {
64        org.apache.log4j.MDC.remove(key);
65    }
66
67    @SuppressWarnings({ "rawtypes", "unchecked" })
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" })
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