/**
 * License Agreement.
 *
 *  JBoss RichFaces - Ajax4jsf Component Library
 *
 * Copyright (C) 2007  Exadel, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */

package org.richfaces.taglib;

import javax.faces.component.UIComponent;
import javax.faces.el.MethodBinding;

import org.richfaces.event.NodeExpandedEvent;
import org.richfaces.event.NodeSelectedEvent;

import com.sun.facelets.FaceletContext;
import com.sun.facelets.tag.MetaRule;
import com.sun.facelets.tag.MetaRuleset;
import com.sun.facelets.tag.Metadata;
import com.sun.facelets.tag.MetadataTarget;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.jsf.ComponentConfig;
import com.sun.facelets.tag.jsf.ComponentHandler;

/**
 * @author Nick Belaevski - nbelaevski@exadel.com
 * created 28.11.2006
 * 
 */
public class TreeListenersTagHandler extends ComponentHandler {
	private final static String CHANGE_EXPAND_LISTENER = "changeExpandListener";
	private final static String NODE_SELECT_LISTENER = "nodeSelectListener";
	
	public TreeListenersTagHandler(ComponentConfig config) {
		super(config);
	}

	protected MetaRuleset createMetaRuleset(Class clazz) {
		MetaRuleset ruleset = super.createMetaRuleset(clazz);
		
		ruleset.addRule(new MetaRule() {

			public Metadata applyRule(String name, final TagAttribute attribute, MetadataTarget metadataTarget) {
				if (CHANGE_EXPAND_LISTENER.equals(name)) {
					return new Metadata() {
						public void applyMetadata(FaceletContext context, Object object) {
							MethodBinding binding = context.getFacesContext().getApplication().createMethodBinding(attribute.getValue(), new Class[] {NodeExpandedEvent.class});
							((UIComponent) object).getAttributes().put(CHANGE_EXPAND_LISTENER, binding);
						}
					};
				} else if (NODE_SELECT_LISTENER.equals(name)) {
					return new Metadata() {
						public void applyMetadata(FaceletContext context, Object object) {
							MethodBinding binding = context.getFacesContext().getApplication().createMethodBinding(attribute.getValue(), new Class[] {NodeSelectedEvent.class});
							((UIComponent) object).getAttributes().put(NODE_SELECT_LISTENER, binding);
						}
					};
				}
				
				return null;
			}
		});
		
		return ruleset;
	}
}
