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 }