/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------------------
* GradientPaintReadHandler
* ------------------------
* (C) Copyright 2003, by Thomas Morgner and Contributors.
*
* Original Author: Thomas Morgner;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* $Id: GradientPaintReadHandler.java,v 1.2 2005/10/18 13:33:32 mungady Exp $
*
* Changes (from 25-Nov-2003)
* --------------------------
* 25-Nov-2003 : Added standard header and Javadocs (DG);
*
*/
package org.jfree.xml.parser.coretypes;
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.geom.Point2D;
import org.jfree.xml.parser.AbstractXmlReadHandler;
import org.jfree.xml.parser.XmlReadHandler;
import org.jfree.xml.parser.XmlReaderException;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* A SAX handler for reading a {@link GradientPaint} from an XML element.
*/
public class GradientPaintReadHandler extends AbstractXmlReadHandler {
/** The gradient paint under construction. */
private GradientPaint gradient;
/** The handler for color 1. */
private XmlReadHandler color1Handler;
/** The handler for color 2. */
private XmlReadHandler color2Handler;
/** The handler for point 1. */
private XmlReadHandler point1Handler;
/** The handler for point 2. */
private XmlReadHandler point2Handler;
/**
* Creates a new handler.
*/
public GradientPaintReadHandler() {
super();
}
/**
* Returns the gradient paint under construction.
*
* @return the gradient paint.
*/
public Object getObject() {
return this.gradient;
}
/**
* Returns the handler for a child element.
*
* @param tagName the tag name.
* @param atts the attributes.
*
* @return the handler.
* @throws SAXException to indicate a parsing error.
* @throws XmlReaderException if there is a reader error.
*/
protected XmlReadHandler getHandlerForChild(final String tagName, final Attributes atts)
throws SAXException, XmlReaderException {
if ("color1".equals(tagName)) {
this.color1Handler = getRootHandler().createHandler(Color.class, tagName, atts);
return this.color1Handler;
}
else if ("color2".equals(tagName)) {
this.color2Handler = getRootHandler().createHandler(Color.class, tagName, atts);
return this.color2Handler;
}
else if ("point1".equals(tagName)) {
this.point1Handler = getRootHandler().createHandler(Point2D.class, tagName, atts);
return this.point1Handler;
}
else if ("point2".equals(tagName)) {
this.point2Handler = getRootHandler().createHandler(Point2D.class, tagName, atts);
return this.point2Handler;
}
return null;
}
/**
* At the end of parsing the element, the gradient paint is constructed.
*
* @throws XmlReaderException if there is a parsing error.
*/
protected void doneParsing() throws XmlReaderException {
if (this.point1Handler == null || this.point2Handler == null
|| this.color1Handler == null || this.color2Handler == null) {
throw new XmlReaderException("Not all required subelements are defined.");
}
this.gradient = new GradientPaint
((Point2D) this.point1Handler.getObject(),
(Color) this.color1Handler.getObject(),
(Point2D) this.point2Handler.getObject(),
(Color) this.color2Handler.getObject());
}
}