/* 
 * 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.csstudio.sds.util.ColorAndFontUtil;
import org.jdom.Element;

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

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

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

	/**
	 * XML attribute name <code>red</code>.
	 * @deprecated keep only for compatibility reasons
	 */
	@Deprecated
	public static final String XML_ATTRIBUTE_RED = "red"; //$NON-NLS-1$

	/**
	 * XML attribute name <code>green</code>.
	 * @deprecated keep only for compatibility reasons
	 */
	@Deprecated
	public static final String XML_ATTRIBUTE_GREEN = "green"; //$NON-NLS-1$

	/**
	 * XML attribute name <code>blue</code>.
	 * @deprecated keep only for compatibility reasons
	 */
	@Deprecated
	public static final String XML_ATTRIBUTE_BLUE = "blue"; //$NON-NLS-1$	

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void writeProperty(final Element domElement, final Object propertyValue) {
		assert propertyValue instanceof String;

		Element colorElement = new Element(XML_ELEMENT_COLOR);
		colorElement.setAttribute(XML_ATTRIBUTE_HEX, "" + propertyValue); //$NON-NLS-1$
		domElement.addContent(colorElement);
	}

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

		// .. try to get the hex value
		String hex = colorElement.getAttributeValue(XML_ATTRIBUTE_HEX);

		// .. if its not available, try it the old way (before SDS 2.0)
		if (hex == null || hex.length() <= 0) {
			String red = colorElement.getAttributeValue(XML_ATTRIBUTE_RED);
			String green = colorElement.getAttributeValue(XML_ATTRIBUTE_GREEN);
			String blue = colorElement.getAttributeValue(XML_ATTRIBUTE_BLUE);
			hex = ColorAndFontUtil.toHex(Integer.parseInt(red), Integer.parseInt(green), Integer.parseInt(blue));
		}

		return hex;
	}

}