/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces.view.facelets.html;
import java.io.Serializable;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;
import org.richfaces.cdk.annotations.Event;
import org.richfaces.cdk.annotations.Tag;
import org.richfaces.cdk.annotations.TagType;
import org.richfaces.view.facelets.TagHandlerUtils;
/**
* @author Nick Belaevski
*
*/
@Event(listener = ActionListener.class, source = "org.richfaces.event.DummyActionListenerSource", tag = { @Tag(name = "actionListener", handlerClass = ActionListenerHandler.class, generate = false, type = TagType.Facelets) })
class LazyActionListener implements ActionListener, Serializable {
/**
*
*/
private static final long serialVersionUID = 6303879250524609909L;
private final String type;
private final ValueExpression binding;
public LazyActionListener(String type, ValueExpression binding) {
this.type = type;
this.binding = binding;
}
public void processAction(ActionEvent event) throws AbortProcessingException {
ActionListener instance = null;
FacesContext faces = FacesContext.getCurrentInstance();
if (faces == null) {
return;
}
if (this.binding != null) {
instance = (ActionListener) binding.getValue(faces.getELContext());
}
if (instance == null && this.type != null) {
try {
instance = TagHandlerUtils.loadClass(this.type, ActionListener.class).newInstance();
} catch (Exception e) {
throw new AbortProcessingException("Couldn't lazily instantiate ActionListener", e);
}
if (this.binding != null) {
binding.setValue(faces.getELContext(), instance);
}
}
if (instance != null) {
instance.processAction(event);
}
}
}