/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You 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.commons.configuration;

 import org.apache.commons.configuration.reloading.Reloadable;

 /**

  * <p>A base class for hierarchical configurations with specific reloading

  * requirements.</p>

  * <p>This class manages a lock object which can be used for synchronization.</p>

  *

  * @author <a

  *         href="http://commons.apache.org/configuration/team-list.html">Commons

  *         Configuration team</a>

  * @since 1.7

  * @version $Id: HierarchicalReloadableConfiguration.java 1210000 2011-12-03 20:43:38Z oheger $

  */

 public class HierarchicalReloadableConfiguration extends HierarchicalConfiguration

     implements Reloadable

 {

     /** Constant for the name used for the lock object. */

     private static final String LOCK_NAME = "HierarchicalReloadableConfigurationLock";

     /** The lock object used by this instance. */

     private final Object reloadLock;

     /**

      * Creates a new instance of {@code HierarchicalReloadableConfiguration}.

      */

     public HierarchicalReloadableConfiguration()

     {

         super();

         reloadLock = new Lock(LOCK_NAME);

     }

     /**

      * Creates a new instance of {@code HierarchicalReloadableConfiguration} and

      * initializes it with the given lock object.

      *

      * @param lock the lock object

      */

     public HierarchicalReloadableConfiguration(Object lock)

     {

         super();

         reloadLock = lock == null ? new Lock(LOCK_NAME) : lock;

     }

     /**

      * Creates a new instance of {@code HierarchicalReloadableConfiguration} and

      * copies all data contained in the specified configuration into the new

      * one.

      *

      * @param c the configuration that is to be copied (if <b>null</b>, this

      * constructor will behave like the standard constructor)

      */

     public HierarchicalReloadableConfiguration(HierarchicalConfiguration c)

     {

         super(c);

         reloadLock = new Lock(LOCK_NAME);

     }

     @Override

     public Object getReloadLock()

     {

         return reloadLock;

     }

 }