/*

  * 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.myfaces.lifecycle;

 import java.util.Iterator;

 import java.util.Map;

 import java.util.concurrent.ConcurrentHashMap;

 import javax.faces.FacesException;

 import javax.faces.lifecycle.Lifecycle;

 import javax.faces.lifecycle.LifecycleFactory;

 /**

  * @author Manfred Geiler (latest modification by $Author$)

  * @author Anton Koinov

  * @version $Revision$ $Date$

  */

 public class LifecycleFactoryImpl extends LifecycleFactory

 {

     /**

      * At start we used synchronized blocks for addLifecycle and getLifecycle. But thinking about it,

      * use a ConcurrentHashMap is better, because retrieval operations (including get) generally 

      * do not block, and it is more often retrieval (at begin of all requests) than addition (when 

      * startup listener is called and configuration occur). 

      */

     private final Map<String, Lifecycle> _lifecycles = new ConcurrentHashMap<String, Lifecycle>();

     public LifecycleFactoryImpl()

     {

         addLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE, new LifecycleImpl());

     }

     public void purgeLifecycle()

     {

         // Note this is not safe, because if by some coincidence one thread call getLifecycle between

         // the two lines below it will throw IllegalArgumentException, but this method is not supposed 

         // to be called in production, so it is ok.

         _lifecycles.clear();

         addLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE, new LifecycleImpl());

     }

     @Override

     public void addLifecycle(String id, Lifecycle lifecycle)

     {

         //synchronized (_lifecycles)

         //{

             if (_lifecycles.get(id) != null)

             {

                 throw new IllegalArgumentException("Lifecycle with id '" + id + "' already exists.");

             }

             _lifecycles.put(id, lifecycle);

         //}

     }

     @Override

     public Lifecycle getLifecycle(String id) throws FacesException

     {

         //synchronized (_lifecycles)

         //{

             Lifecycle lifecycle = _lifecycles.get(id);

             if (lifecycle == null)

             {

                 throw new IllegalArgumentException("Unknown lifecycle '" + id + "'.");

             }

             return lifecycle;

         //}

     }

     @Override

     public Iterator<String> getLifecycleIds()

     {

         return _lifecycles.keySet().iterator();

     }

 }