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


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  * DimensionObjectDescription.java
29  * -------------------------------
30  * (C)opyright 2004, by Thomas Morgner and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: DimensionObjectDescription.java,v 1.2 2005/10/18 13:31:58 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 13-Jan-2004 : Initial version
40  *
41  */
42
43 package org.jfree.xml.factory.objects;
44
45 import java.awt.Dimension JavaDoc;
46 import java.awt.geom.Dimension2D JavaDoc;
47
48 /**
49  * An object-description for a <code>java.awt.Dimension</code> object.
50  *
51  * @author Thomas Morgner
52  */
53 public class DimensionObjectDescription extends AbstractObjectDescription {
54
55     /**
56      * Creates a new object description.
57      */
58     public DimensionObjectDescription() {
59         super(Dimension JavaDoc.class);
60         setParameterDefinition("width", Float JavaDoc.class);
61         setParameterDefinition("height", Float JavaDoc.class);
62     }
63
64     /**
65      * Creates an object based on the description.
66      *
67      * @return The object.
68      */
69     public Object JavaDoc createObject() {
70         final Dimension2D JavaDoc dim = new Dimension JavaDoc();
71
72         final float width = getFloatParameter("width");
73         final float height = getFloatParameter("height");
74         dim.setSize(width, height);
75         return dim;
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     /**
95      * Sets the parameters of this description object to match the supplied object.
96      *
97      * @param o the object (should be an instance of <code>Dimension2D</code>).
98      *
99      * @throws ObjectFactoryException if the object is not an instance of <code>Point2D</code>.
100      */
101     public void setParameterFromObject(final Object JavaDoc o) throws ObjectFactoryException {
102         if (!(o instanceof Dimension JavaDoc)) {
103             throw new ObjectFactoryException("The given object is no java.awt.geom.Dimension2D.");
104         }
105
106         final Dimension JavaDoc dim = (Dimension JavaDoc) o;
107         final float width = (float) dim.getWidth();
108         final float height = (float) dim.getHeight();
109
110         setParameter("width", new Float JavaDoc(width));
111         setParameter("height", new Float JavaDoc(height));
112     }
113 }
114
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