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 * Line2DObjectDescription.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: Line2DObjectDescription.java,v 1.3 2005/11/14 11:02:46 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.Line2D;
047
048 /**
049 * An object-description for a <code>Line2D</code> object.
050 *
051 * @author Thomas Morgner
052 */
053 public class Line2DObjectDescription extends AbstractObjectDescription {
054
055 /**
056 * Creates a new object description.
057 */
058 public Line2DObjectDescription() {
059 super(Line2D.class);
060 setParameterDefinition("x1", Float.class);
061 setParameterDefinition("x2", Float.class);
062 setParameterDefinition("y1", Float.class);
063 setParameterDefinition("y2", Float.class);
064 }
065
066 /**
067 * Creates an object based on this description.
068 *
069 * @return The object.
070 */
071 public Object createObject() {
072 final Line2D line = new Line2D.Float();
073
074 final float x1 = getFloatParameter("x1");
075 final float x2 = getFloatParameter("x2");
076 final float y1 = getFloatParameter("y1");
077 final float y2 = getFloatParameter("y2");
078 line.setLine(x1, y1, x2, y2);
079 return line;
080 }
081
082 /**
083 * Returns a parameter value as a float.
084 *
085 * @param param the parameter name.
086 *
087 * @return The float value.
088 */
089 private float getFloatParameter(final String param) {
090 final Float p = (Float) getParameter(param);
091 if (p == null) {
092 return 0;
093 }
094 return p.floatValue();
095 }
096
097 /**
098 * Sets the parameters of this description object to match the supplied object.
099 *
100 * @param o the object (should be an instance of <code>Line2D</code>).
101 *
102 * @throws ObjectFactoryException if the object is not an instance of <code>Line2D</code>.
103 */
104 public void setParameterFromObject(final Object o) throws ObjectFactoryException {
105 if (!(o instanceof Line2D)) {
106 throw new ObjectFactoryException("The given object is no java.awt.geom.Line2D.");
107 }
108 final Line2D line = (Line2D) o;
109 final float x1 = (float) line.getX1();
110 final float x2 = (float) line.getX2();
111 final float y1 = (float) line.getY1();
112 final float y2 = (float) line.getY2();
113
114 setParameter("x1", new Float(x1));
115 setParameter("x2", new Float(x2));
116 setParameter("y1", new Float(y1));
117 setParameter("y2", new Float(y2));
118 }
119 }