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 }