    001    /* ========================================================================
    002     * JCommon : a free general purpose class library for the Java(tm) platform
    003     * ========================================================================
    004     *
    005     * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jcommon/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
    025     * in the United States and other countries.]
    026     *
    027     * -----------------------------
    028     * Point2DObjectDescription.java
    029     * -----------------------------
    030     * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
    031     *
    032     * Original Author:  Thomas Morgner;
    033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
    034     *
    035     * $Id: Point2DObjectDescription.java,v 1.3 2005/11/14 11:03:35 mungady Exp $
    036     *
    037     * Changes (from 19-Feb-2003)
    038     * -------------------------
    039     * 19-Feb-2003 : Added standard header and Javadocs (DG);
    040     * 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
    041     *
    042     */
    043
    044    package org.jfree.xml.factory.objects;
    045
    046    import java.awt.geom.Point2D;
    047
    048    /**
    049     * An object-description for a <code>Point2D</code> object.
    050     *
    051     * @author Thomas Morgner
    052     */
    053    public class Point2DObjectDescription extends AbstractObjectDescription {
    054
    055        /**
    056         * Creates a new object description.
    057         */
    058        public Point2DObjectDescription() {
    059            super(Point2D.class);
    060            setParameterDefinition("x", Float.class);
    061            setParameterDefinition("y", Float.class);
    062        }
    063
    064        /**
    065         * Creates an object based on this description.
    066         *
    067         * @return The object.
    068         */
    069        public Object createObject() {
    070            final Point2D point = new Point2D.Float();
    071
    072            final float x = getFloatParameter("x");
    073            final float y = getFloatParameter("y");
    074            point.setLocation(x, y);
    075            return point;
    076        }
    077
    078        /**
    079         * Returns a parameter value as a float.
    080         *
    081         * @param param  the parameter name.
    082         *
    083         * @return The float value.
    084         */
    085        private float getFloatParameter(final String param) {
    086            final Float p = (Float) getParameter(param);
    087            if (p == null) {
    088                return 0;
    089            }
    090            return p.floatValue();
    091        }
    092
    093        /**
    094         * Sets the parameters of this description object to match the supplied object.
    095         *
    096         * @param o  the object (should be an instance of <code>Point2D</code>).
    097         *
    098         * @throws ObjectFactoryException if the object is not an instance of <code>Point2D</code>.
    099         */
    100        public void setParameterFromObject(final Object o) throws ObjectFactoryException {
    101            if (!(o instanceof Point2D)) {
    102                throw new ObjectFactoryException("The given object is no java.awt.geom.Point2D.");
    103            }
    104
    105            final Point2D point = (Point2D) o;
    106            final float x = (float) point.getX();
    107            final float y = (float) point.getY();
    108
    109            setParameter("x", new Float(x));
    110            setParameter("y", new Float(y));
    111        }
    112    }