/*

  * 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.event;

 import javax.el.ELContext;

 import javax.el.ValueExpression;

 import javax.faces.component.StateHolder;

 import javax.faces.context.FacesContext;

 import javax.faces.event.AbortProcessingException;

 import javax.faces.event.ActionEvent;

 import javax.faces.event.ActionListener;

 /**

  * The MyFaces implementation of the <code>SetPropertyActionListener</code>.

  * 

  * @author Dennis Byrne

  * @since 1.2

  */

 public class SetPropertyActionListener implements ActionListener, StateHolder

 {

     private ValueExpression target;

     private ValueExpression value;

     private boolean _transient ;

     public SetPropertyActionListener(){}

     public SetPropertyActionListener(ValueExpression target, ValueExpression value)

     {

         this.target = target;

         this.value = value;

     }

     public void processAction(ActionEvent actionEvent) throws AbortProcessingException

     {

         if( target == null )

         {

             throw new AbortProcessingException("@target has not been set");

         }

         if( value == null )

         {

             throw new AbortProcessingException("@value has not been set");

         }

         FacesContext ctx = FacesContext.getCurrentInstance();

         if( ctx == null )

         {

             throw new AbortProcessingException("FacesContext ctx is null");

         }

         ELContext ectx = ctx.getELContext();

         if( ectx == null )

         {

             throw new AbortProcessingException("ELContext ectx is null");

         }

         // TODO use a Converter before calling setValue 

         target.setValue(ectx, value.getValue(ectx));

     }

     public Object saveState(FacesContext context)

     {

         Object[] state = new Object[2];

         state[0] = target;

         state[1] = value;

         return state;

     }

     public void restoreState(FacesContext context, Object state)

     {

         Object[] values = (Object[]) state;

         target = (ValueExpression) values[0];

         value = (ValueExpression) values[1];

     }

     public boolean isTransient()

     {

         return _transient;

     }

     public void setTransient(boolean trans)

     {

         this._transient = trans;

     }

     public ValueExpression getTarget()

     {

         return target;

     }

     public void setTarget(ValueExpression target)

     {

         this.target = target;

     }

     public ValueExpression getValue()

     {

         return value;

     }

     public void setValue(ValueExpression value)

     {

         this.value = value;

     }

 }