/**
 * Copyright (c) 2009 Oracle Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Oracle Corporation - initial API and implementation
 */
package org.eclipse.jst.jsf.apache.trinidad.tagsupport.converter.operations;

import org.w3c.dom.Element;

/**
 * ITransformOperation implementation to handle merging of an Element's optional
 * default style class with a specified "styleClass" as the current Element's
 * "class" attribute.
 * 
 * @author Ian Trimble - Oracle
 */
public class CreateClassAttributeOperation extends AbstractTrinidadTransformOperation {

	/* (non-Javadoc)
	 * @see org.eclipse.jst.pagedesigner.dtmanager.converter.operations.AbstractTransformOperation#transform(org.w3c.dom.Element, org.w3c.dom.Element)
	 */
	@Override
	public Element transform(Element srcElement, Element curElement) {
		String classValue = null;
		if (getParameters().length > 0) {
			classValue = getParameters()[0];
		}
		String styleClass = srcElement.getAttribute("styleClass"); //$NON-NLS-1$
		if (styleClass != null && styleClass.length() > 0) {
			if (classValue == null) {
				classValue = styleClass;
			} else {
				classValue = styleClass + " " + classValue; //$NON-NLS-1$
			}
		}
		if (classValue != null && curElement != null) {
			curElement.setAttribute("class", classValue); //$NON-NLS-1$
		}
		return curElement;
	}

}