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Java > Open Source Codes > org > jfree > chart > plot > DialShape


1 /* ===========================================================
2  * JFreeChart : a free chart 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/jfreechart/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 License
20  * along with this library; if not, write to the Free Software Foundation,
21  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
24  * in the United States and other countries.]
25  *
26  * --------------
27  * DialShape.java
28  * --------------
29  * (C) Copyright 2003-2005, by Object Refinery Limited.
30  *
31  * Original Author: David Gilbert (for Object Refinery Limited);
32  * Contributor(s): -;
33  *
34  * $Id: DialShape.java,v 1.4 2005/05/19 14:03:41 mungady Exp $
35  *
36  * Changes:
37  * --------
38  * 20-Aug-2003 : Version 1 (DG);
39  *
40  */
41
42 package org.jfree.chart.plot;
43
44 import java.io.ObjectStreamException JavaDoc;
45 import java.io.Serializable JavaDoc;
46
47 /**
48  * Used to indicate the background shape for a
49  * {@link org.jfree.chart.plot.MeterPlot}.
50  */
51 public final class DialShape implements Serializable JavaDoc {
52
53     /** For serialization. */
54     private static final long serialVersionUID = -3471933055190251131L;
55     
56     /** Circle. */
57     public static final DialShape CIRCLE = new DialShape("DialShape.CIRCLE");
58
59     /** Chord. */
60     public static final DialShape CHORD = new DialShape("DialShape.CHORD");
61
62     /** Pie. */
63     public static final DialShape PIE = new DialShape("DialShape.PIE");
64
65     /** The name. */
66     private String JavaDoc name;
67
68     /**
69      * Private constructor.
70      *
71      * @param name the name.
72      */
73     private DialShape(String JavaDoc name) {
74         this.name = name;
75     }
76
77     /**
78      * Returns a string representing the object.
79      *
80      * @return The string.
81      */
82     public String JavaDoc toString() {
83         return this.name;
84     }
85
86     /**
87      * Returns <code>true</code> if this object is equal to the specified
88      * object, and <code>false</code> otherwise.
89      *
90      * @param obj the other object.
91      *
92      * @return A boolean.
93      */
94     public boolean equals(Object JavaDoc obj) {
95         if (this == obj) {
96             return true;
97         }
98         if (!(obj instanceof DialShape)) {
99             return false;
100         }
101         DialShape shape = (DialShape) obj;
102         if (!this.name.equals(shape.toString())) {
103             return false;
104         }
105         return true;
106     }
107     
108     /**
109      * Ensures that serialization returns the unique instances.
110      *
111      * @return The object.
112      *
113      * @throws ObjectStreamException if there is a problem.
114      */
115     private Object JavaDoc readResolve() throws ObjectStreamException JavaDoc {
116         if (this.equals(DialShape.CIRCLE)) {
117             return DialShape.CIRCLE;
118         }
119         else if (this.equals(DialShape.CHORD)) {
120             return DialShape.CHORD;
121         }
122         else if (this.equals(DialShape.PIE)) {
123             return DialShape.PIE;
124         }
125         return null;
126     }
127
128 }
129
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