/*

  * 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.view.facelets.tag.jsf;

 import java.io.Serializable;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.el.ELException;

 import javax.faces.context.FacesContext;

 import javax.faces.event.ComponentSystemEvent;

 import javax.faces.event.ComponentSystemEventListener;

 /**

  * MyFaces specific listener used to clear all component binding if

  * normal navigation occur during a POST request.

  * 

  * @author Leonardo Uribe

  * @since 2.0.6

  *

  */

 public class ClearBindingValueExpressionListener implements ComponentSystemEventListener, Serializable

 {

     /**

      * 

      */

     private static final long serialVersionUID = -6066524284031941519L;

     public ClearBindingValueExpressionListener()

     {

         super();

     }

     public void processEvent(ComponentSystemEvent event)

     {

         try

         {

             event.getComponent().getValueExpression("binding").setValue(

                     FacesContext.getCurrentInstance().getELContext(), null);

         }

         catch(ELException e)

         {

             Logger log = Logger.getLogger(ClearBindingValueExpressionListener.class.getName());

             if (log.isLoggable(Level.FINE))

             {

                 log.log(Level.FINE, "Cannot reset binding for: " + event.getComponent().getClientId(), e);

             }

         }

         catch(NullPointerException e)

         {

             Logger log = Logger.getLogger(ClearBindingValueExpressionListener.class.getName());

             if (log.isLoggable(Level.FINE))

             {

                 log.log(Level.FINE, "Cannot reset binding for: " + event.getComponent().getClientId(), e);

             }

         }

     }

 }