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.impl;
026
027import java.util.HashMap;
028import java.util.Iterator;
029import java.util.Map;
030
031import org.apache.log4j.MDCFriend;
032import org.slf4j.spi.MDCAdapter;
033
034public class Log4jMDCAdapter implements MDCAdapter {
035
036        static {
037                if (VersionUtil.getJavaMajorVersion() >= 9) {
038                        MDCFriend.fixForJava9();
039                }
040        }
041
042        public void clear() {
043                @SuppressWarnings("rawtypes")
044                Map map = org.apache.log4j.MDC.getContext();
045                if (map != null) {
046                        map.clear();
047                }
048        }
049
050        public String get(String key) {
051                return (String) org.apache.log4j.MDC.get(key);
052        }
053
054        /**
055         * Put a context value (the <code>val</code> parameter) as identified with
056         * the <code>key</code> parameter into the current thread's context map. The
057         * <code>key</code> parameter cannot be null. Log4j does <em>not</em>
058         * support null for the <code>val</code> parameter.
059         * 
060         * <p>
061         * This method delegates all work to log4j's MDC.
062         * 
063         * @throws IllegalArgumentException
064         *             in case the "key" or <b>"val"</b> parameter is null
065         */
066        public void put(String key, String val) {
067                org.apache.log4j.MDC.put(key, val);
068        }
069
070        public void remove(String key) {
071                org.apache.log4j.MDC.remove(key);
072        }
073
074        @SuppressWarnings({ "rawtypes", "unchecked" })
075        public Map getCopyOfContextMap() {
076                Map old = org.apache.log4j.MDC.getContext();
077                if (old != null) {
078                        return new HashMap(old);
079                } else {
080                        return null;
081                }
082        }
083
084        @SuppressWarnings({ "rawtypes", "unchecked" })
085        public void setContextMap(Map contextMap) {
086                Map old = org.apache.log4j.MDC.getContext();
087                if (old == null) {
088                        Iterator entrySetIterator = contextMap.entrySet().iterator();
089                        while (entrySetIterator.hasNext()) {
090                                Map.Entry mapEntry = (Map.Entry) entrySetIterator.next();
091                                org.apache.log4j.MDC.put((String) mapEntry.getKey(), mapEntry.getValue());
092                        }
093                } else {
094                        old.clear();
095                        old.putAll(contextMap);
096                }
097        }
098}