Source for org.jfree.chart.event.ChartChangeEventType

   1: /* ===========================================================
   2:  * JFreeChart : a free chart library for the Java(tm) platform
   3:  * ===========================================================
   4:  *
   5:  * (C) Copyright 2000-2007, 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, 2007, by Object Refinery Limited.
  31:  *
  32:  * Original Author:  David Gilbert (for Object Refinery Limited);
  33:  * Contributor(s):   -;
  34:  *
  35:  * Changes:
  36:  * --------
  37:  * 18-Feb-2005 : Version 1 (DG);
  38:  * 
  39:  */
  40: 
  41: package org.jfree.chart.event;
  42: 
  43: import java.io.ObjectStreamException;
  44: import java.io.Serializable;
  45: 
  46: /**
  47:  * Defines tokens used to indicate an event type.
  48:  */
  49: public final class ChartChangeEventType implements Serializable {
  50: 
  51:     /** For serialization. */
  52:     private static final long serialVersionUID = 5481917022435735602L;
  53:     
  54:     /** GENERAL. */
  55:     public static final ChartChangeEventType GENERAL 
  56:             = new ChartChangeEventType("ChartChangeEventType.GENERAL");
  57: 
  58:     /** NEW_DATASET. */
  59:     public static final ChartChangeEventType NEW_DATASET 
  60:             = new ChartChangeEventType("ChartChangeEventType.NEW_DATASET");
  61: 
  62:     /** DATASET_UPDATED. */
  63:     public static final ChartChangeEventType DATASET_UPDATED
  64:             = new ChartChangeEventType("ChartChangeEventType.DATASET_UPDATED");
  65: 
  66:     /** The name. */
  67:     private String name;
  68: 
  69:     /**
  70:      * Private constructor.
  71:      *
  72:      * @param name  the name.
  73:      */
  74:     private ChartChangeEventType(String name) {
  75:         this.name = name;
  76:     }
  77: 
  78:     /**
  79:      * Returns a string representing the object.
  80:      *
  81:      * @return The string.
  82:      */
  83:     public String toString() {
  84:         return this.name;
  85:     }
  86: 
  87:     /**
  88:      * Returns <code>true</code> if this object is equal to the specified 
  89:      * object, and <code>false</code> otherwise.
  90:      *
  91:      * @param obj  the object (<code>null</code> permitted).
  92:      *
  93:      * @return A boolean.
  94:      */
  95:     public boolean equals(Object obj) {
  96:         if (this == obj) {
  97:             return true;
  98:         }
  99:         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: }