001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.util;
018
019import org.slf4j.MDC;
020
021import java.util.Hashtable;
022import java.util.Map;
023
024/**
025 *  Helper class as MDC Log4J adapter doesn't behave well with null values
026 */
027public class MDCHelper {
028
029    public static Map getCopyOfContextMap() {
030        Map map = MDC.getCopyOfContextMap();
031        if (map == null) {
032            map = new Hashtable();
033        }
034        return map;
035    }
036
037    public static void setContextMap(Map map) {
038        if (map == null) {
039            map = new Hashtable();
040        }
041        MDC.setContextMap(map);
042    }
043
044}