/*
 * $Id: TableElementCellModifier.java,v 1.2 2005-05-06 00:57:33 stefanbjarni Exp $
 * Copyright Narushima Hironori. All rights reserved.
 */
package net.sourceforge.phpeclipse.wizards.html;

import javax.xml.parsers.DocumentBuilderFactory;

import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.ICellModifier;
import org.eclipse.swt.widgets.Item;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

/**
 * 
 */
public class TableElementCellModifier implements ICellModifier {

	DocumentBuilderFactory builderFactory;
	IPropertyChangeListener listener;

	public TableElementCellModifier(IPropertyChangeListener listener) {
		builderFactory = DocumentBuilderFactory.newInstance();
		this.listener = listener;
	}

	public boolean canModify(Object element, String property) {
		return getValue(element, property) != null;
	}
	
	public Object getValue(Object trElem, String property) {
		if(trElem instanceof Element){
			Element e = (Element)trElem;
			if( e.getNodeName().equals("tr") ){
				int v = TableElementModel.toNumeric(property);
				Element[] cells = TableElementModel.chooseCellElements(e);
				if(v >= 0 && v < cells.length){
					NodeList nodes = cells[v].getChildNodes();
					if(nodes.getLength() == 1){
						Node n = nodes.item(0);
						if(n instanceof Text){
							return n.getNodeValue();
						}
					}
				}
			}
		}
		return null;
	}

	public void modify(Object element, String property, Object value) {
		if (element instanceof Item) {
			element = ((Item) element).getData();
		}
		Element trElem =  (Element)element;
		int index = TableElementModel.toNumeric(property);
		Element cellElem = TableElementModel.chooseCellElements(trElem)[index];
		
		NodeList nodes = cellElem.getChildNodes();
		for(int i=0; i<nodes.getLength(); i++){
			cellElem.removeChild( nodes.item(i) );
		}
		Document doc = cellElem.getOwnerDocument();
		
		if( value instanceof String){
			cellElem.appendChild(doc.createTextNode((String)value));
		}
		// notify listener
		if(listener != null){
			String oldValue = nodes.item(0).getNodeValue();
			listener.propertyChange(new PropertyChangeEvent(this, property, (String)value, oldValue));
		}
	}

}