Log4jMDCAdapter xref

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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.slf4j.spi.MDCAdapter;
    32
    33  public class Log4jMDCAdapter implements MDCAdapter {
    34
    35    public void clear() {
    36      Map map = org.apache.log4j.MDC.getContext();
    37      if (map != null) {
    38        map.clear();
    39      }
    40    }
    41
    42    public String get(String key) {
    43      return (String) org.apache.log4j.MDC.get(key);
    44    }
    45
    46    /**
    47     * Put a context value (the <code>val</code> parameter) as identified with
    48     * the <code>key</code> parameter into the current thread's context map. The
    49     * <code>key</code> parameter cannot be null. Log4j does <em>not</em>
    50     * support null for the <code>val</code> parameter.
    51     *
    52     * <p>
    53     * This method delegates all work to log4j's MDC.
    54     *
    55     * @throws IllegalArgumentException
    56     *           in case the "key" or <b>"val"</b> parameter is null
    57     */
    58    public void put(String key, String val) {
    59      org.apache.log4j.MDC.put(key, val);
    60    }
    61
    62    public void remove(String key) {
    63      org.apache.log4j.MDC.remove(key);
    64    }
    65
    66    public Map getCopyOfContextMap() {
    67      Map old = org.apache.log4j.MDC.getContext();
    68      if(old != null) {
    69        return new HashMap(old);
    70      } else {
    71        return null;
    72      }
    73    }
    74
    75    public void setContextMap(Map contextMap) {
    76      Map old = org.apache.log4j.MDC.getContext();
    77      if(old == null) {
    78        Iterator entrySetIterator = contextMap.entrySet().iterator();
    79        while(entrySetIterator.hasNext()) {
    80          Map.Entry mapEntry = (Map.Entry) entrySetIterator.next();
    81          org.apache.log4j.MDC.put((String) mapEntry.getKey(), mapEntry.getValue());
    82        }
    83      } else {
    84        old.clear();
    85        old.putAll(contextMap);
    86      }
    87    }
    88  }