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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * 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.]
 * 
 * ---------------------------------
 * rectangle2DObjectDescription.java
 * ---------------------------------
 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: Rectangle2DObjectDescription.java,v 1.3 2005/11/14 11:03:47 mungady Exp $
 *
 * Changes (from 19-Feb-2003)
 * -------------------------
 * 19-Feb-2003 : Added standard header and Javadocs (DG);
 * 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
 *
 */

package org.jfree.xml.factory.objects;

import java.awt.geom.Rectangle2D;

/**
 * An object-description for a Rectangle2D object.
 *
 * @author Thomas Morgner
 */
public class Rectangle2DObjectDescription extends AbstractObjectDescription {

    /**
     * Creates a new object description.
     */
    public Rectangle2DObjectDescription() {
        super(Rectangle2D.class);
        setParameterDefinition("width", Float.class);
        setParameterDefinition("height", Float.class);
        setParameterDefinition("x", Float.class);
        setParameterDefinition("y", Float.class);
    }

    /**
     * Creates an object based on this description.
     *
     * @return The object.
     */
    public Object createObject() {
        final Rectangle2D rect = new Rectangle2D.Float();

        final float w = getFloatParameter("width");
        final float h = getFloatParameter("height");
        final float x = getFloatParameter("x");
        final float y = getFloatParameter("y");
        rect.setRect(x, y, w, h);
        return rect;
    }

    /**
     * Returns a parameter value as a float.
     *
     * @param param  the parameter name.
     *
     * @return The float value.
     */
    private float getFloatParameter(final String param) {
        final Float p = (Float) getParameter(param);
        if (p == null) {
            return 0;
        }
        return p.floatValue();
    }

    /**
     * Sets the parameters of this description object to match the supplied object.
     *
     * @param o  the object (should be an instance of Rectangle2D).
     *
     * @throws ObjectFactoryException if the object is not an instance of Rectangle2D.
     */
    public void setParameterFromObject(final Object o) throws ObjectFactoryException {
        if (!(o instanceof Rectangle2D)) {
            throw new ObjectFactoryException("The given object is no java.awt.geom.Rectangle2D.");
        }

        final Rectangle2D rect = (Rectangle2D) o;
        final float x = (float) rect.getX();
        final float y = (float) rect.getY();
        final float w = (float) rect.getWidth();
        final float h = (float) rect.getHeight();

        setParameter("x", new Float(x));
        setParameter("y", new Float(y));
        setParameter("width", new Float(w));
        setParameter("height", new Float(h));
    }

}