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The private implementation classes of the Apache MyFaces Core JSF-2.0 Implementation
There is a newer version: 4.1.0-RC2
/*
 * 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.application;

import javax.el.ELException;
import javax.el.MethodExpression;
import javax.faces.FacesException;
import javax.faces.application.Application;
import javax.faces.application.NavigationHandler;
import javax.faces.component.ActionSource;
import javax.faces.component.ActionSource2;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.MethodBinding;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;


/**
 * @author Manfred Geiler (latest modification by $Author: cjhoward $)
 * @author Anton Koinov
 * @version $Revision: 795817 $ $Date: 2009-07-20 08:14:55 -0500 (Mon, 20 Jul 2009) $
 */
public class ActionListenerImpl implements ActionListener
{
    public void processAction(ActionEvent actionEvent) throws AbortProcessingException
    {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        Application application = facesContext.getApplication();
        UIComponent component = actionEvent.getComponent();
        
        MethodExpression methodExpression = null;
        MethodBinding methodBinding = null;
        
        String fromAction = null;
        String outcome = null;
        
        // Backwards compatibility for pre-1.2.
        
        if (component instanceof ActionSource) {
            methodBinding = ((ActionSource) component).getAction();
        }
        
        else {
            // Must be an instance of ActionSource2.
            
            methodExpression = ((ActionSource2) component).getActionExpression();
        }
        
        if (methodExpression != null)
        {
            fromAction = methodExpression.getExpressionString();
            try
            {
                Object objOutcome = methodExpression.invoke(facesContext.getELContext(), null);
                if (objOutcome != null)
                {
                    outcome = objOutcome.toString();
                }
            }
            catch (ELException e)
            {
                Throwable cause = e.getCause();
                if (cause != null && cause instanceof AbortProcessingException)
                {
                    throw (AbortProcessingException)cause;
                }
   
                throw new FacesException("Error calling action method of component with id " + actionEvent.getComponent().getClientId(facesContext), e);
                
            }
            catch (RuntimeException e)
            {
                throw new FacesException("Error calling action method of component with id " + actionEvent.getComponent().getClientId(facesContext), e);
            }
        }
        
        else if (methodBinding != null) {
            fromAction = methodBinding.getExpressionString();
            try
            {
                Object objOutcome = methodBinding.invoke(facesContext, null);

                if (objOutcome != null)
                {
                    outcome = objOutcome.toString();
                }
            }
            catch (EvaluationException e)
            {
                Throwable cause = e.getCause();
                if (cause != null && cause instanceof AbortProcessingException)
                {
                    throw (AbortProcessingException)cause;
                }
   
                throw new FacesException("Error calling action method of component with id " + actionEvent.getComponent().getClientId(facesContext), e);
                
            }
            catch (RuntimeException e)
            {
                throw new FacesException("Error calling action method of component with id " + actionEvent.getComponent().getClientId(facesContext), e);
            }
        }
        
        NavigationHandler navigationHandler = application.getNavigationHandler();
        navigationHandler.handleNavigation(facesContext, fromAction, outcome);
        //Render Response if needed
        facesContext.renderResponse();

    }
}