/*
* 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.custom.updateactionlistener;
import java.io.IOException;
import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.application.Application;
import javax.faces.component.ActionSource;
import javax.faces.component.UIComponent;
import javax.faces.convert.Converter;
import javax.faces.event.ActionListener;
import javax.faces.webapp.UIComponentTag;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.sun.facelets.FaceletContext;
import com.sun.facelets.FaceletException;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.TagConfig;
import com.sun.facelets.tag.TagHandler;
import com.sun.facelets.tag.jsf.ComponentConfig;
/**
* Tag handler for the Tomahawk UpdateActionListener tag
*
* @since 1.1.7
* @author arobinson74
*/
public class UpdateActionListenerTagHandler extends TagHandler
{
private static Log logger = LogFactory
.getLog(UpdateActionListenerTagHandler.class);
private TagAttribute converterAttr;
private TagAttribute propertyAttr;
private TagAttribute valueAttr;
/**
* @param config
*/
public UpdateActionListenerTagHandler(ComponentConfig config)
{
this((TagConfig) config);
}
/**
* @param config
*/
public UpdateActionListenerTagHandler(TagConfig config)
{
super(config);
valueAttr = getRequiredAttribute("value");
propertyAttr = getRequiredAttribute("property");
converterAttr = getAttribute("converter");
}
/**
* @see com.sun.facelets.FaceletHandler#apply(com.sun.facelets.FaceletContext, javax.faces.component.UIComponent)
*/
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException, FacesException, FaceletException, ELException
{
logger.debug("Apply called. Component: " + parent);
ActionSource actionSource = (ActionSource) parent;
if (sourceHasProperty(actionSource))
return;
UpdateActionListener al = new UpdateActionListener();
Application app = ctx.getFacesContext().getApplication();
if (converterAttr != null)
{
Converter converter = app.createConverter(converterAttr
.getValue(ctx));
al.setConverter(converter);
}
String value = valueAttr.getValue();
if (UIComponentTag.isValueReference(value))
al.setValueBinding(app.createValueBinding(valueAttr.getValue()));
else
al.setValue(value);
al.setPropertyBinding(app.createValueBinding(propertyAttr.getValue()));
actionSource.addActionListener(al);
}
private boolean sourceHasProperty(ActionSource source)
{
ActionListener[] listeners = source.getActionListeners();
for (int i = 0; i < listeners.length; i++)
{
ActionListener listener = listeners[i];
if (listener instanceof UpdateActionListener == false)
continue;
UpdateActionListener al = (UpdateActionListener) listener;
if (al.getPropertyBinding().getExpressionString().equals(
this.propertyAttr.getValue()))
{
logger.debug("Action listener already has a listener for "
+ this.propertyAttr.getValue());
return true;
}
}
logger.debug("Action listener for property is not present. Property: "
+ this.propertyAttr.getValue());
return false;
}
}