001/**
002 * Copyright (c) 2004-2011 QOS.ch
003 * All rights reserved.
004 *
005 * Permission is hereby granted, free  of charge, to any person obtaining
006 * a  copy  of this  software  and  associated  documentation files  (the
007 * "Software"), to  deal in  the Software without  restriction, including
008 * without limitation  the rights to  use, copy, modify,  merge, publish,
009 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
010 * permit persons to whom the Software  is furnished to do so, subject to
011 * the following conditions:
012 *
013 * The  above  copyright  notice  and  this permission  notice  shall  be
014 * included in all copies or substantial portions of the Software.
015 *
016 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
017 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
018 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
019 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
020 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
021 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
022 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
023 *
024 */
025package org.slf4j.helpers;
026
027import java.util.Map;
028
029import org.slf4j.spi.MDCAdapter;
030
031/**
032 * This adapter is an empty implementation of the {@link MDCAdapter} interface.
033 * It is used for all logging systems which do not support mapped
034 * diagnostic contexts such as JDK14, simple and NOP. 
035 * 
036 * @author Ceki Gülcü
037 * 
038 * @since 1.4.1
039 */
040public class NOPMDCAdapter implements MDCAdapter {
041
042    public void clear() {
043    }
044
045    public String get(String key) {
046        return null;
047    }
048
049    public void put(String key, String val) {
050    }
051
052    public void remove(String key) {
053    }
054
055    public Map<String, String> getCopyOfContextMap() {
056        return null;
057    }
058
059    public void setContextMap(Map<String, String> contextMap) {
060        // NOP
061    }
062
063}