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Java > Open Source Codes > org > jfree > chart > event > ChartChangeEventType


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
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  * ChartChangeEventType.java
29  * -------------------------
30  * (C) Copyright 2005, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: ChartChangeEventType.java,v 1.2.2.1 2005/10/25 20:42:25 mungady Exp $
36  *
37  * Changes:
38  * --------
39  * 18-Feb-2005 : Version 1 (DG);
40  *
41  */
42
43 package org.jfree.chart.event;
44
45 import java.io.ObjectStreamException JavaDoc;
46 import java.io.Serializable JavaDoc;
47
48 /**
49  * Defines tokens used to indicate an event type.
50  */
51 public final class ChartChangeEventType implements Serializable JavaDoc {
52
53     /** For serialization. */
54     private static final long serialVersionUID = 5481917022435735602L;
55     
56     /** GENERAL. */
57     public static final ChartChangeEventType GENERAL
58         = new ChartChangeEventType("ChartChangeEventType.GENERAL");
59
60     /** NEW_DATASET. */
61     public static final ChartChangeEventType NEW_DATASET
62         = new ChartChangeEventType("ChartChangeEventType.NEW_DATASET");
63
64     /** DATASET_UPDATED. */
65     public static final ChartChangeEventType DATASET_UPDATED
66         = new ChartChangeEventType("ChartChangeEventType.DATASET_UPDATED");
67
68     /** The name. */
69     private String JavaDoc name;
70
71     /**
72      * Private constructor.
73      *
74      * @param name the name.
75      */
76     private ChartChangeEventType(String JavaDoc name) {
77         this.name = name;
78     }
79
80     /**
81      * Returns a string representing the object.
82      *
83      * @return The string.
84      */
85     public String JavaDoc toString() {
86         return this.name;
87     }
88
89     /**
90      * Returns <code>true</code> if this object is equal to the specified
91      * object, and <code>false</code> otherwise.
92      *
93      * @param obj the object (<code>null</code> permitted).
94      *
95      * @return A boolean.
96      */
97     public boolean equals(Object JavaDoc obj) {
98         if (this == obj) {
99             return true;
100         }
101         if (!(obj instanceof ChartChangeEventType)) {
102             return false;
103         }
104         ChartChangeEventType that = (ChartChangeEventType) obj;
105         if (!this.name.equals(that.toString())) {
106             return false;
107         }
108         return true;
109     }
110     
111     /**
112      * Returns a hash code value for the object.
113      *
114      * @return The hashcode
115      */
116     public int hashCode() {
117         return this.name.hashCode();
118     }
119
120     /**
121      * Ensures that serialization returns the unique instances.
122      *
123      * @return The object.
124      *
125      * @throws ObjectStreamException if there is a problem.
126      */
127     private Object JavaDoc readResolve() throws ObjectStreamException JavaDoc {
128         if (this.equals(ChartChangeEventType.GENERAL)) {
129             return ChartChangeEventType.GENERAL;
130         }
131         else if (this.equals(ChartChangeEventType.NEW_DATASET)) {
132             return ChartChangeEventType.NEW_DATASET;
133         }
134         else if (this.equals(ChartChangeEventType.DATASET_UPDATED)) {
135             return ChartChangeEventType.DATASET_UPDATED;
136         }
137         return null;
138     }
139     
140 }
141
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