ThreadLocalMap


1   /*
2    * Copyright 1999-2005 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.helpers;
18  
19  import java.util.Hashtable  ;
20  
21  /**
22     <code>ThreadLocalMap</code> extends {@link InheritableThreadLocal}
23     to bequeath a copy of the hashtable of the MDC of the parent
24     thread.
25  
26     @author Ceki G&uuml;lc&uuml;
27     @since 1.2
28  */
29  final public class ThreadLocalMap extends InheritableThreadLocal   {
30  
31    public
32    final
33    Object   childValue(Object   parentValue) {
34      Hashtable   ht = (Hashtable  ) parentValue;
35      if(ht != null) {
36        return ht.clone();
37      } else {
38        return null;
39      }
40    }
41  }
42

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