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Java > Open Source Codes > org > jfree > xml > factory > objects > Point2DObjectDescription


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * -----------------------------
28  * Point2DObjectDescription.java
29  * -----------------------------
30  * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: Point2DObjectDescription.java,v 1.3 2005/11/14 11:03:35 mungady Exp $
36  *
37  * Changes (from 19-Feb-2003)
38  * -------------------------
39  * 19-Feb-2003 : Added standard header and Javadocs (DG);
40  * 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
41  *
42  */
43
44 package org.jfree.xml.factory.objects;
45
46 import java.awt.geom.Point2D JavaDoc;
47
48 /**
49  * An object-description for a <code>Point2D</code> object.
50  *
51  * @author Thomas Morgner
52  */
53 public class Point2DObjectDescription extends AbstractObjectDescription {
54
55     /**
56      * Creates a new object description.
57      */
58     public Point2DObjectDescription() {
59         super(Point2D JavaDoc.class);
60         setParameterDefinition("x", Float JavaDoc.class);
61         setParameterDefinition("y", Float JavaDoc.class);
62     }
63
64     /**
65      * Creates an object based on this description.
66      *
67      * @return The object.
68      */
69     public Object JavaDoc createObject() {
70         final Point2D JavaDoc point = new Point2D.Float JavaDoc();
71
72         final float x = getFloatParameter("x");
73         final float y = getFloatParameter("y");
74         point.setLocation(x, y);
75         return point;
76     }
77
78     /**
79      * Returns a parameter value as a float.
80      *
81      * @param param the parameter name.
82      *
83      * @return The float value.
84      */
85     private float getFloatParameter(final String JavaDoc param) {
86         final Float JavaDoc p = (Float JavaDoc) getParameter(param);
87         if (p == null) {
88             return 0;
89         }
90         return p.floatValue();
91     }
92
93     /**
94      * Sets the parameters of this description object to match the supplied object.
95      *
96      * @param o the object (should be an instance of <code>Point2D</code>).
97      *
98      * @throws ObjectFactoryException if the object is not an instance of <code>Point2D</code>.
99      */
100     public void setParameterFromObject(final Object JavaDoc o) throws ObjectFactoryException {
101         if (!(o instanceof Point2D JavaDoc)) {
102             throw new ObjectFactoryException("The given object is no java.awt.geom.Point2D.");
103         }
104
105         final Point2D JavaDoc point = (Point2D JavaDoc) o;
106         final float x = (float) point.getX();
107         final float y = (float) point.getY();
108
109         setParameter("x", new Float JavaDoc(x));
110         setParameter("y", new Float JavaDoc(y));
111     }
112 }
113
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