/* 
 * Copyright (c) 2006 Stiftung Deutsches Elektronen-Synchroton, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.internal.persistence;

import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.PointList;
import org.jdom.Element;

/**
 * Persistence handler for the property type <code>sds.pointlist</code>.
 * 
 * @author Alexander Will
 * @version $Revision: 1.1 $
 * 
 */
public final class PointListPropertyPersistenceHandler extends
		AbstractPropertyPersistenceHandler {

	/**
	 * XML tag name <code>pointList</code>.
	 */
	public static final String XML_ELEMENT_POINT_LIST = "pointList"; //$NON-NLS-1$

	/**
	 * XML tag name <code>point</code>.
	 */
	public static final String XML_ELEMENT_POINT = "point"; //$NON-NLS-1$

	/**
	 * XML attribute name <code>y</code>.
	 */
	public static final String XML_ATTRIBUTE_Y = "y"; //$NON-NLS-1$

	/**
	 * XML attribute name <code>x</code>.
	 */
	public static final String XML_ATTRIBUTE_X = "x"; //$NON-NLS-1$	

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void writeProperty(final Element domElement,
			final Object propertyValue) {
		PointList pointList = (PointList) propertyValue;

		Element pointListElement = new Element(XML_ELEMENT_POINT_LIST);

		for (int i = 0; i < pointList.size(); i++) {
			Point point = pointList.getPoint(i);

			Element pointElement = new Element(XML_ELEMENT_POINT);
			pointElement.setAttribute(XML_ATTRIBUTE_X, "" + point.x); //$NON-NLS-1$
			pointElement.setAttribute(XML_ATTRIBUTE_Y, "" + point.y); //$NON-NLS-1$
			pointListElement.addContent(pointElement);
		}

		domElement.addContent(pointListElement);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Object readProperty(final Element domElement) {
		Element pointListElement = domElement.getChild(XML_ELEMENT_POINT_LIST);

		PointList result = new PointList();

		for (Object o : pointListElement.getChildren(XML_ELEMENT_POINT)) {
			Element pointElement = (Element) o;

			String x = pointElement.getAttributeValue(XML_ATTRIBUTE_X);
			String y = pointElement.getAttributeValue(XML_ATTRIBUTE_Y);

			result
					.addPoint(new Point(Integer.parseInt(x), Integer
							.parseInt(y)));
		}

		return result;
	}
}