001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * -------------------------
028 * ChartChangeEventType.java
029 * -------------------------
030 * (C) Copyright 2005, 2007, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes:
036 * --------
037 * 18-Feb-2005 : Version 1 (DG);
038 *
039 */
040
041 package org.jfree.chart.event;
042
043 import java.io.ObjectStreamException;
044 import java.io.Serializable;
045
046 /**
047 * Defines tokens used to indicate an event type.
048 */
049 public final class ChartChangeEventType implements Serializable {
050
051 /** For serialization. */
052 private static final long serialVersionUID = 5481917022435735602L;
053
054 /** GENERAL. */
055 public static final ChartChangeEventType GENERAL
056 = new ChartChangeEventType("ChartChangeEventType.GENERAL");
057
058 /** NEW_DATASET. */
059 public static final ChartChangeEventType NEW_DATASET
060 = new ChartChangeEventType("ChartChangeEventType.NEW_DATASET");
061
062 /** DATASET_UPDATED. */
063 public static final ChartChangeEventType DATASET_UPDATED
064 = new ChartChangeEventType("ChartChangeEventType.DATASET_UPDATED");
065
066 /** The name. */
067 private String name;
068
069 /**
070 * Private constructor.
071 *
072 * @param name the name.
073 */
074 private ChartChangeEventType(String name) {
075 this.name = name;
076 }
077
078 /**
079 * Returns a string representing the object.
080 *
081 * @return The string.
082 */
083 public String toString() {
084 return this.name;
085 }
086
087 /**
088 * Returns <code>true</code> if this object is equal to the specified
089 * object, and <code>false</code> otherwise.
090 *
091 * @param obj the object (<code>null</code> permitted).
092 *
093 * @return A boolean.
094 */
095 public boolean equals(Object obj) {
096 if (this == obj) {
097 return true;
098 }
099 if (!(obj instanceof ChartChangeEventType)) {
100 return false;
101 }
102 ChartChangeEventType that = (ChartChangeEventType) obj;
103 if (!this.name.equals(that.toString())) {
104 return false;
105 }
106 return true;
107 }
108
109 /**
110 * Returns a hash code value for the object.
111 *
112 * @return The hashcode
113 */
114 public int hashCode() {
115 return this.name.hashCode();
116 }
117
118 /**
119 * Ensures that serialization returns the unique instances.
120 *
121 * @return The object.
122 *
123 * @throws ObjectStreamException if there is a problem.
124 */
125 private Object readResolve() throws ObjectStreamException {
126 if (this.equals(ChartChangeEventType.GENERAL)) {
127 return ChartChangeEventType.GENERAL;
128 }
129 else if (this.equals(ChartChangeEventType.NEW_DATASET)) {
130 return ChartChangeEventType.NEW_DATASET;
131 }
132 else if (this.equals(ChartChangeEventType.DATASET_UPDATED)) {
133 return ChartChangeEventType.DATASET_UPDATED;
134 }
135 return null;
136 }
137
138 }