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1   /*
2    * Copyright 2001-2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.log4j;
18  
19  import java.util.Hashtable;
20  import java.util.Map;
21  
22  public class MDC {
23  
24    public static void put(String key, String value) {
25      org.slf4j.MDC.put(key, value);
26    }
27    
28    public static void put(String key, Object value) {
29      if (value != null) {
30        put(key, value.toString());
31      } else {
32        put(key, null);
33      }
34    }
35    
36    public static Object get(String key) {
37      return org.slf4j.MDC.get(key);
38    }
39    
40    public static void remove(String key) {
41      org.slf4j.MDC.remove(key);
42    }
43    
44    public static void clear() {
45      org.slf4j.MDC.clear();
46    }
47    
48    /** 
49     * This method is not part of the Log4J public API. However it 
50     * has been called by other projects. This method is here temporarily  
51     * until projects who are depending on this method release fixes. 
52     */
53    @SuppressWarnings({ "rawtypes", "unchecked" })
54    @Deprecated
55    public static Hashtable getContext() {
56      Map map = org.slf4j.MDC.getCopyOfContextMap();
57  
58      if (map != null) {
59        return new Hashtable(map);
60      }
61      else {
62        return new Hashtable();
63      }
64    }
65  }