/*

  * 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.el;

 import java.util.Iterator;

 import javax.faces.FactoryFinder;

 import javax.faces.event.PhaseEvent;

 import javax.faces.event.PhaseId;

 import javax.faces.event.PhaseListener;

 import javax.faces.lifecycle.LifecycleFactory;

 import org.apache.myfaces.el.unified.ELResolverBuilder;

 /**

  * The class will initialize the resolver for JSP

  * 

  * @author Mathias Broekelmann (latest modification by $Author$)

  * @version $Revision$ $Date$

  */

 public final class ResolverForJSPInitializer implements PhaseListener

 {

     private final ELResolverBuilder _resolverBuilder;

     private volatile boolean initialized;

     private final javax.el.CompositeELResolver _resolverForJSP;

     public ResolverForJSPInitializer(final ELResolverBuilder resolverBuilder,

                                      final javax.el.CompositeELResolver resolverForJSP)

     {

         _resolverBuilder = resolverBuilder;

         _resolverForJSP = resolverForJSP;

     }

     public void beforePhase(final PhaseEvent event)

     {

         if (!initialized)

         {

             synchronized(this)

             {

                 if (!initialized)

                 {

                     _resolverBuilder.build(_resolverForJSP);

                     LifecycleFactory factory = (LifecycleFactory) 

                             FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);

                     for (Iterator<String> iter = factory.getLifecycleIds(); iter.hasNext();)

                     {

                         factory.getLifecycle(iter.next()).removePhaseListener(this);

                     }

                     initialized = true;

                 }

             }

         }

     }

     public void afterPhase(final PhaseEvent event)

     {

     }

     public PhaseId getPhaseId()

     {

         return PhaseId.ANY_PHASE;

     }

 }