    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}