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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.log4j.helpers;
    19
    20  import java.util.Hashtable;
    21
    22  /**
    23     <code>ThreadLocalMap</code> extends {@link InheritableThreadLocal}
    24     to bequeath a copy of the hashtable of the MDC of the parent
    25     thread.
    26
    27     @author Ceki G&uuml;lc&uuml;
    28     @since 1.2
    29  */
    30  final public class ThreadLocalMap extends InheritableThreadLocal {
    31
    32    public
    33    final
    34    Object childValue(Object parentValue) {
    35      Hashtable ht = (Hashtable) parentValue;
    36      if(ht != null) {
    37        return ht.clone();
    38      } else {
    39        return null;
    40      }
    41    }
    42  }