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Java > Open Source Codes > org > jfree > xml > factory > objects > Line2DObjectDescription


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  * Line2DObjectDescription.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: Line2DObjectDescription.java,v 1.3 2005/11/14 11:02:46 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.Line2D JavaDoc;
47
48 /**
49  * An object-description for a <code>Line2D</code> object.
50  *
51  * @author Thomas Morgner
52  */
53 public class Line2DObjectDescription extends AbstractObjectDescription {
54
55     /**
56      * Creates a new object description.
57      */
58     public Line2DObjectDescription() {
59         super(Line2D JavaDoc.class);
60         setParameterDefinition("x1", Float JavaDoc.class);
61         setParameterDefinition("x2", Float JavaDoc.class);
62         setParameterDefinition("y1", Float JavaDoc.class);
63         setParameterDefinition("y2", Float JavaDoc.class);
64     }
65
66     /**
67      * Creates an object based on this description.
68      *
69      * @return The object.
70      */
71     public Object JavaDoc createObject() {
72         final Line2D JavaDoc line = new Line2D.Float JavaDoc();
73
74         final float x1 = getFloatParameter("x1");
75         final float x2 = getFloatParameter("x2");
76         final float y1 = getFloatParameter("y1");
77         final float y2 = getFloatParameter("y2");
78         line.setLine(x1, y1, x2, y2);
79         return line;
80     }
81
82     /**
83      * Returns a parameter value as a float.
84      *
85      * @param param the parameter name.
86      *
87      * @return The float value.
88      */
89     private float getFloatParameter(final String JavaDoc param) {
90         final Float JavaDoc p = (Float JavaDoc) getParameter(param);
91         if (p == null) {
92             return 0;
93         }
94         return p.floatValue();
95     }
96
97     /**
98      * Sets the parameters of this description object to match the supplied object.
99      *
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 JavaDoc o) throws ObjectFactoryException {
105         if (!(o instanceof Line2D JavaDoc)) {
106             throw new ObjectFactoryException("The given object is no java.awt.geom.Line2D.");
107         }
108         final Line2D JavaDoc line = (Line2D JavaDoc) 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 JavaDoc(x1));
115         setParameter("x2", new Float JavaDoc(x2));
116         setParameter("y1", new Float JavaDoc(y1));
117         setParameter("y2", new Float JavaDoc(y2));
118     }
119 }
120
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