/* 
 * 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.font</code>.
 * 
 * @author Alexander Will
 * @version $Revision: 1.1 $
 * 
 */
public final class FontPropertyPersistenceHandler extends AbstractPropertyPersistenceHandler {

	private static int ITALIC = 1 << 1;
	private static int BOLD = 1 << 0;

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

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

	/**
	 * XML attribute name <code>fontName</code>.
	 */
	@Deprecated
	public static final String XML_ATTRIBUTE_FONT_NAME = "fontName"; //$NON-NLS-1$

	/**
	 * XML attribute name <code>fontName</code>.
	 */
	@Deprecated
	public static final String XML_ATTRIBUTE_FONT_HEIGHT = "height"; //$NON-NLS-1$

	/**
	 * XML attribute name <code>fontName</code>.
	 */
	@Deprecated
	public static final String XML_ATTRIBUTE_FONT_STYLE = "style"; //$NON-NLS-1$

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

		String font = (String) propertyValue;
		fontElement.setAttribute(XML_ATTRIBUTE_FONT, font);
		domElement.addContent(fontElement);
	}

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

		// .. try to get the composite font string
		String font = fontElement.getAttributeValue(XML_ATTRIBUTE_FONT);

		// .. if its not available, try it the old way (before SDS 2.0)
		if (font == null || font.length() <= 0) {
			String nameAttribute = fontElement.getAttributeValue(XML_ATTRIBUTE_FONT_NAME);
			String heightAttribute = fontElement.getAttributeValue(XML_ATTRIBUTE_FONT_HEIGHT);
			String styleAttribute = fontElement.getAttributeValue(XML_ATTRIBUTE_FONT_STYLE);

			try {
				// .. name
				String name = (nameAttribute != null && nameAttribute.length() > 0) ? nameAttribute : "Arial";

				// .. size
				int height = -1;
				try {
					height = Integer.parseInt(heightAttribute);
				} catch (NumberFormatException nfe) {
				}

				// .. styles (bold, italic)
				int style = 0;
				try {
					style = Integer.parseInt(styleAttribute);
				} catch (NumberFormatException nfe) {
				}

				boolean italic = ((style & ITALIC) == ITALIC);
				boolean bold = ((style & BOLD) == BOLD);

				font = ColorAndFontUtil.toFontString(name, height, bold, italic);
			} catch (Exception e) {
				font = ColorAndFontUtil.toFontString("Arial", 8);
			}

		}
		return font;
	}

}