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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.helpers;
26  
27  import java.util.Map;
28  
29  import org.slf4j.spi.MDCAdapter;
30  
31  /**
32   * This adapter is an empty implementation of the {@link MDCAdapter} interface.
33   * It is used for all logging systems which do not support mapped
34   * diagnostic contexts such as JDK14, simple and NOP. 
35   * 
36   * @author Ceki Gülcü
37   * 
38   * @since 1.4.1
39   */
40  public class NOPMDCAdapter implements MDCAdapter {
41  
42      public void clear() {
43      }
44  
45      public String get(String key) {
46          return null;
47      }
48  
49      public void put(String key, String val) {
50      }
51  
52      public void remove(String key) {
53      }
54  
55      public Map<String, String> getCopyOfContextMap() {
56          return null;
57      }
58  
59      public void setContextMap(Map<String, String> contextMap) {
60          // NOP
61      }
62  
63  }