log4j-over-slf4j/src/main/java/org/apache/log4j/MDC.java

/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.log4j;

import java.util.Hashtable;
import java.util.Map;

public class MDC {

    public static void put(String key, String value) {
        org.slf4j.MDC.put(key, value);
    }

    public static void put(String key, Object value) {
        if (value != null) {
            put(key, value.toString());
        } else {
            put(key, null);
        }
    }

    public static Object get(String key) {
        return org.slf4j.MDC.get(key);
    }

    public static void remove(String key) {
        org.slf4j.MDC.remove(key);
    }

    public static void clear() {
        org.slf4j.MDC.clear();
    }

    /** 
     * This method is not part of the Log4J public API. However it 
     * has been called by other projects. This method is here temporarily  
     * until projects who are depending on this method release fixes. 
     * 
     * @return a copy of the underlying map returned as a Hashtable
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Deprecated
    public static Hashtable getContext() {
        Map map = org.slf4j.MDC.getCopyOfContextMap();

        if (map != null) {
            return new Hashtable(map);
        } else {
            return new Hashtable();
        }
    }
}