ColorAndFontSaxHandler.java

/* 
 * 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.ui.internal.editor.newproperties.colorservice;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

/**
 * 
 * SAX handler for colors and fonts. <br>
 * 
 * @author Kai Meyer (C1 WPS)
 * @version $Revision: 1.2 $
 * 
 */
public final class ColorAndFontSaxHandler extends AbstractColorAndFontHandler {
	
	private Map<String, NamedStyle> _styles;
	
	private NamedStyle _currentStyle;

	/**
	 * Standard constructor.
	 */
	public ColorAndFontSaxHandler() {
		_styles = new HashMap<String, NamedStyle>();
	}
	
	@Override
	public void startDocument() throws SAXException {
		super.startDocument();
		reset();
	}
	
	@Override
	public void reset() {
		_styles.clear();
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void startElement(final String uri, final String localName,
			final String qName, final Attributes attributes)
			throws SAXException {
		if (ColorAndFontConstants.STYLE_TAG.getIdentifier().equals(qName)) {
			NamedStyle style = createStyle(attributes);
			_styles.put(style.getName(), style);
			_currentStyle = style;
		} else if (ColorAndFontConstants.COLOR_TAG.getIdentifier().equals(qName)) {
			if (_currentStyle != null) {
				_currentStyle.addColor(createColor(attributes));
			}
		} else if (ColorAndFontConstants.FONT_TAG.getIdentifier().equals(qName)) {
			if (_currentStyle != null) {
				_currentStyle.addFont(createFont(attributes));
			}
		}
	}
	
	private NamedStyle createStyle(Attributes attributes) throws SAXException {
		try {
			String name = attributes.getValue(ColorAndFontConstants.NAME_TAG.getIdentifier());
			String description = attributes.getValue(ColorAndFontConstants.DESCRIPTION_TAG.getIdentifier());
			NamedStyle result = new NamedStyle(name, description);
			return result;
		} catch (Exception e) {
			throw new SAXException("Couldn't create Style", e);
		}
	}
	
	private NamedColor createColor(Attributes attributes) throws SAXException {
		try {
			String name = attributes.getValue(ColorAndFontConstants.NAME_TAG.getIdentifier());
			String description = attributes.getValue(ColorAndFontConstants.DESCRIPTION_TAG.getIdentifier());
			String hex = attributes.getValue(ColorAndFontConstants.COLOR_HEX_TAG.getIdentifier());
			NamedColor result = new NamedColor(name, description, hex);
			return result;
		} catch (Exception e) {
			throw new SAXException("Couldn't create Color", e);
		}
	}
	
	private NamedFont createFont(Attributes attributes) throws SAXException {
		try {
			String name = attributes.getValue(ColorAndFontConstants.NAME_TAG.getIdentifier());
			String description = attributes.getValue(ColorAndFontConstants.DESCRIPTION_TAG.getIdentifier());
			String fontName = attributes.getValue(ColorAndFontConstants.FONT_NAME_TAG.getIdentifier());
			String fontSizeString = attributes.getValue(ColorAndFontConstants.FONT_SIZE_TAG.getIdentifier());
			int fontSize = Integer.valueOf(fontSizeString);
			String boldString = attributes.getValue(ColorAndFontConstants.FONT_BOLD_TAG.getIdentifier());
			boolean bold = Boolean.valueOf(boldString);
			String italicString = attributes.getValue(ColorAndFontConstants.FONT_ITALIC_TAG.getIdentifier());
			boolean italic = Boolean.valueOf(italicString);
			NamedFont result = new NamedFont(name, description, fontName, fontSize, bold, italic);
			return result;
		} catch (Exception e) {
			throw new SAXException("Couldn't create font", e);
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void endElement(final String uri, final String localName,
			final String qName) throws SAXException {
		if (ColorAndFontConstants.STYLE_TAG.getIdentifier().equals(qName)) {
			_currentStyle = null;
		}
	}
	
	@Override
	public NamedStyle getStyle(String styleName) {
		return _styles.get(styleName);
	}

	@Override
	public List<NamedStyle> getStyles() {
		return new ArrayList<NamedStyle>(_styles.values());
	}

}