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.Deque;
028import java.util.Map;
029
030import org.slf4j.spi.MDCAdapter;
031
032/**
033 * This adapter is an empty implementation of the {@link MDCAdapter} interface.
034 * It is used for all logging systems which do not support mapped
035 * diagnostic contexts such as JDK14, simple and NOP. 
036 * 
037 * @author Ceki Gülcü
038 * 
039 * @since 1.4.1
040 */
041public class NOPMDCAdapter implements MDCAdapter {
042
043    public void clear() {
044    }
045
046    public String get(String key) {
047        return null;
048    }
049
050    public void put(String key, String val) {
051    }
052
053    public void remove(String key) {
054    }
055
056    public Map<String, String> getCopyOfContextMap() {
057        return null;
058    }
059
060    public void setContextMap(Map<String, String> contextMap) {
061        // NOP
062    }
063
064    @Override
065    public void pushByKey(String key, String value) {
066    }
067
068    @Override
069    public String popByKey(String key) {
070        return null;
071    }
072
073    @Override
074    public Deque<String> getCopyOfDequeByKey(String key) {
075        return null;
076    }
077    
078    public void clearDequeByKey(String key) {
079    }
080
081}