/**
 * License Agreement.
 *
 * Rich Faces - Natural Ajax for Java Server Faces (JSF)
 *
 * 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.ajax4jsf.templatecompiler.elements.vcp;

import org.ajax4jsf.templatecompiler.builder.CompilationContext;
import org.ajax4jsf.templatecompiler.builder.CompilationException;
import org.ajax4jsf.templatecompiler.elements.A4JRendererElementsFactory;
import org.ajax4jsf.templatecompiler.elements.TemplateElementBase;
import org.apache.velocity.VelocityContext;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * Processing f:insertChildren-tag.
 * 
 * @author ayukhovich@exadel.com (latest modification by $Author: alexsmirnov $)
 * @version $Revision: 1.1.2.3 $ $Date: 2007/02/26 20:48:48 $
 */
public class FInsertChildren extends TemplateElementBase {

	private static final String TEMPLATE = A4JRendererElementsFactory.TEMPLATES_TEMPLATECOMPILER_PATH+"/insertChildren.vm";

	private static int numberOfIndex = 0;

	private String indexExpression;

	private String varExpression;


	public FInsertChildren(Node element, final CompilationContext componentBean) {
		super(element, componentBean);
		NamedNodeMap nnm = element.getAttributes();
		Node value = nnm.getNamedItem("index");

		this.indexExpression = null;
		this.varExpression = null;

		if (value != null) {
			this.indexExpression = value.getNodeValue();
		} else {
			value = nnm.getNamedItem("var");
			if (value != null) {
				this.varExpression = value.getNodeValue();
			} // if
		} // if

	}

	public String getBeginElement() throws CompilationException {
		numberOfIndex++;

		VelocityContext context = new VelocityContext();

		context.put("indexChildren", new Integer(numberOfIndex));
		context.put("ELIndex", this.indexExpression);
		context.put("ELVar", this.varExpression);
		return this.getComponentBean().processTemplate(getTemplateName(), context);
	}

	/**
	 * @return
	 */
	protected String getTemplateName() {
		return TEMPLATE;
	}

	public String getEndElement() {
		return null;
	}

}
