/*

  * 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 javax.faces.event;

 import javax.el.ELContext;

 import javax.el.ELException;

 import javax.el.MethodExpression;

 import javax.faces.component.StateHolder;

 import javax.faces.context.FacesContext;

 /**

  * See Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>

  *

  * @author Stan Silvert

  */

 public class MethodExpressionActionListener implements ActionListener, StateHolder {

     private MethodExpression methodExpression;

     private boolean isTransient = false;

     /** Creates a new instance of MethodExpressionActionListener */

     public MethodExpressionActionListener() {

     }

     public MethodExpressionActionListener(MethodExpression methodExpression) {

         this.methodExpression = methodExpression;

     }

     public void processAction(ActionEvent actionEvent) throws AbortProcessingException {

         try

         {

             Object[] params = new Object[]{actionEvent};

             methodExpression.invoke(elContext(), params);

         }

         catch (ELException e)

         {

             Throwable cause = e.getCause();

             if (cause != null && cause instanceof AbortProcessingException)

             {

                 throw (AbortProcessingException)cause;

             }

             else

             {

                 throw e;

             }

         }

     }

     private ELContext elContext() {

         return FacesContext.getCurrentInstance().getELContext();

     }

     public void restoreState(FacesContext context, Object state) {

         methodExpression = (MethodExpression)state;

     }

     public Object saveState(FacesContext context) {

         return methodExpression;

     }

     public void setTransient(boolean newTransientValue) {

         isTransient = newTransientValue;

     }

     public boolean isTransient() {

         return isTransient;

     }

 }