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/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.slf4j.helpers;

import java.util.Deque;
import java.util.Map;

import org.slf4j.spi.MDCAdapter;

/**
 * This adapter is an empty implementation of the {@link MDCAdapter} interface.
 * It is used for all logging systems which do not support mapped
 * diagnostic contexts such as JDK14, simple and NOP. 
 * 
 * @author Ceki Gülcü
 * 
 * @since 1.4.1
 */
public class NOPMDCAdapter implements MDCAdapter {

    public void clear() {
    }

    public String get(String key) {
        return null;
    }

    public void put(String key, String val) {
    }

    public void remove(String key) {
    }

    public Map getCopyOfContextMap() {
        return null;
    }

    public void setContextMap(Map contextMap) {
        // NOP
    }

    @Override
    public void pushByKey(String key, String value) {
    }

    @Override
    public String popByKey(String key) {
        return null;
    }

    @Override
    public Deque getCopyOfDequeByKey(String key) {
        return null;
    }
    
    public void clearDequeByKey(String key) {
    }

}