/*******************************************************************************
 * Copyright (c) 2005 Oracle Corporation.
 * 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:
 *    Ian Trimble - initial API and implementation
 *******************************************************************************/ 
package org.eclipse.jst.pagedesigner.jsf.ui.converter.operations.jsf;

import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import org.eclipse.jst.pagedesigner.converter.ConvertPosition;
import org.eclipse.jst.pagedesigner.dom.EditModelQuery;
import org.eclipse.jst.pagedesigner.dtmanager.converter.ITransformOperation;
import org.eclipse.jst.pagedesigner.dtmanager.converter.operations.AbstractTransformOperation;
import org.eclipse.jst.pagedesigner.dtmanager.converter.operations.TransformOperationFactory;
import org.eclipse.jst.pagedesigner.jsf.core.dom.JSFDOMUtil;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * ITransformOperation implementation specifically for the "column" JSF (HTML)
 * Element. 
 * 
 * <br><b>Note:</b> requires ITransformOperation.setTagConverterContext(...) to
 * have been called to provide a valid ITagConverterContext instance prior to
 * a call to the transform(...) method.
 * 
 * @author Ian Trimble - Oracle
 */
public class ColumnOperation extends AbstractTransformOperation {

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jst.pagedesigner.dtmanager.converter.operations.internal.provisional.AbstractTransformOperation#transform(org.w3c.dom.Element, org.w3c.dom.Element)
	 */
	public Element transform(Element srcElement, Element curElement) {

		//create "td" Element
		Element tdElement = createElement("td");

		//get parent Node
		Node parentNode = srcElement.getParentNode();

		//process if parentNode is a "dataTable" Element
		if (parentNode != null && parentNode.getNodeType() == Node.ELEMENT_NODE && parentNode.getLocalName().equals("dataTable")) {
			//tokenize "columnClasses" attribute into a List
			List columnClassesList = new ArrayList();
			String columnClassesAttribute = ((Element)parentNode).getAttribute("columnClasses");
			if (columnClassesAttribute != null && columnClassesAttribute.length() > 0) {
				StringTokenizer tokenizer = new StringTokenizer(columnClassesAttribute, ", ");
				while (tokenizer.hasMoreTokens()) {
					columnClassesList.add(tokenizer.nextToken());
				}
			}
			//set "class" attribute
			int offset = EditModelQuery.getInstance().getSameTypeNodeIndex(srcElement);
			if (offset < columnClassesList.size()) {
				ITransformOperation operation =
					TransformOperationFactory.getInstance().getTransformOperation(
							TransformOperationFactory.OP_CreateAttributeOperation,
							new String[]{"class", (String)columnClassesList.get(offset)});
				operation.transform(srcElement, tdElement);
			}
		}

		//add non-transparent (?), non-facet children (for further processing)
        if (EditModelQuery.getInstance().hasNonTransparentChild(srcElement, new String[] {"facet"})) {
        	Node childNode = srcElement.getFirstChild();
        	int index = 0;
        	while (childNode != null) {
        		if (!(childNode instanceof Element) || !JSFDOMUtil.isFacet((Element)childNode)) {
        			tagConverterContext.addChild(childNode, new ConvertPosition(tdElement, index++));
        		}
        		childNode = childNode.getNextSibling();
        	}
        } else {
        	//append single space for esthetics of the "td" Element
        	appendChildText(" ", tdElement);
        }

		return tdElement;
	}

}