001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2005, 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, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * $Id: ChartChangeEventType.java,v 1.2.2.1 2005/10/25 20:42:25 mungady Exp $
036 *
037 * Changes:
038 * --------
039 * 18-Feb-2005 : Version 1 (DG);
040 *
041 */
042
043 package org.jfree.chart.event;
044
045 import java.io.ObjectStreamException;
046 import java.io.Serializable;
047
048 /**
049 * Defines tokens used to indicate an event type.
050 */
051 public final class ChartChangeEventType implements Serializable {
052
053 /** For serialization. */
054 private static final long serialVersionUID = 5481917022435735602L;
055
056 /** GENERAL. */
057 public static final ChartChangeEventType GENERAL
058 = new ChartChangeEventType("ChartChangeEventType.GENERAL");
059
060 /** NEW_DATASET. */
061 public static final ChartChangeEventType NEW_DATASET
062 = new ChartChangeEventType("ChartChangeEventType.NEW_DATASET");
063
064 /** DATASET_UPDATED. */
065 public static final ChartChangeEventType DATASET_UPDATED
066 = new ChartChangeEventType("ChartChangeEventType.DATASET_UPDATED");
067
068 /** The name. */
069 private String name;
070
071 /**
072 * Private constructor.
073 *
074 * @param name the name.
075 */
076 private ChartChangeEventType(String name) {
077 this.name = name;
078 }
079
080 /**
081 * Returns a string representing the object.
082 *
083 * @return The string.
084 */
085 public String toString() {
086 return this.name;
087 }
088
089 /**
090 * Returns <code>true</code> if this object is equal to the specified
091 * object, and <code>false</code> otherwise.
092 *
093 * @param obj the object (<code>null</code> permitted).
094 *
095 * @return A boolean.
096 */
097 public boolean equals(Object obj) {
098 if (this == obj) {
099 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 readResolve() throws ObjectStreamException {
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 }