001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2008, 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 2005-2008, 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    }