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    1   /**
    2    * Copyright (c) 2004-2011 QOS.ch
    3    * All rights reserved.
    4    *
    5    * Permission is hereby granted, free  of charge, to any person obtaining
    6    * a  copy  of this  software  and  associated  documentation files  (the
    7    * "Software"), to  deal in  the Software without  restriction, including
    8    * without limitation  the rights to  use, copy, modify,  merge, publish,
    9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
    10   * permit persons to whom the Software  is furnished to do so, subject to
    11   * the following conditions:
    12   *
    13   * The  above  copyright  notice  and  this permission  notice  shall  be
    14   * included in all copies or substantial portions of the Software.
    15   *
    16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
    17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
    18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
    19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
    22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    23   *
    24   */
    25  package org.slf4j.impl;
    26
    27  import java.util.HashMap;
    28  import java.util.Iterator;
    29  import java.util.Map;
    30
    31  import org.apache.log4j.MDCFriend;
    32  import org.slf4j.spi.MDCAdapter;
    33
    34  public class Log4jMDCAdapter implements MDCAdapter {
    35
    36  	static {
    37  		if (VersionUtil.getJavaMajorVersion() >= 9) {
    38  			MDCFriend.fixForJava9();
    39  		}
    40  	}
    41
    42  	public void clear() {
    43  		@SuppressWarnings("rawtypes")
    44  		Map map = org.apache.log4j.MDC.getContext();
    45  		if (map != null) {
    46  			map.clear();
    47  		}
    48  	}
    49
    50  	public String get(String key) {
    51  		return (String) org.apache.log4j.MDC.get(key);
    52  	}
    53
    54  	/**
    55  	 * Put a context value (the <code>val</code> parameter) as identified with
    56  	 * the <code>key</code> parameter into the current thread's context map. The
    57  	 * <code>key</code> parameter cannot be null. Log4j does <em>not</em>
    58  	 * support null for the <code>val</code> parameter.
    59  	 *
    60  	 * <p>
    61  	 * This method delegates all work to log4j's MDC.
    62  	 *
    63  	 * @throws IllegalArgumentException
    64  	 *             in case the "key" or <b>"val"</b> parameter is null
    65  	 */
    66  	public void put(String key, String val) {
    67  		org.apache.log4j.MDC.put(key, val);
    68  	}
    69
    70  	public void remove(String key) {
    71  		org.apache.log4j.MDC.remove(key);
    72  	}
    73
    74  	@SuppressWarnings({ "rawtypes", "unchecked" })
    75  	public Map getCopyOfContextMap() {
    76  		Map old = org.apache.log4j.MDC.getContext();
    77  		if (old != null) {
    78  			return new HashMap(old);
    79  		} else {
    80  			return null;
    81  		}
    82  	}
    83
    84  	@SuppressWarnings({ "rawtypes", "unchecked" })
    85  	public void setContextMap(Map contextMap) {
    86  		Map old = org.apache.log4j.MDC.getContext();
    87  		if (old == null) {
    88  			Iterator entrySetIterator = contextMap.entrySet().iterator();
    89  			while (entrySetIterator.hasNext()) {
    90  				Map.Entry mapEntry = (Map.Entry) entrySetIterator.next();
    91  				org.apache.log4j.MDC.put((String) mapEntry.getKey(), mapEntry.getValue());
    92  			}
    93  		} else {
    94  			old.clear();
    95  			old.putAll(contextMap);
    96  		}
    97  	}
    98  }