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 * DialShape.java
029 * --------------
030 * (C) Copyright 2003-2008, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes:
036 * --------
037 * 20-Aug-2003 : Version 1 (DG);
038 * 12-Nov-2007 : Implemented hashCode() (DG);
039 *
040 */
041
042 package org.jfree.chart.plot;
043
044 import java.io.ObjectStreamException;
045 import java.io.Serializable;
046
047 /**
048 * Used to indicate the background shape for a
049 * {@link org.jfree.chart.plot.MeterPlot}.
050 */
051 public final class DialShape implements Serializable {
052
053 /** For serialization. */
054 private static final long serialVersionUID = -3471933055190251131L;
055
056 /** Circle. */
057 public static final DialShape CIRCLE = new DialShape("DialShape.CIRCLE");
058
059 /** Chord. */
060 public static final DialShape CHORD = new DialShape("DialShape.CHORD");
061
062 /** Pie. */
063 public static final DialShape PIE = new DialShape("DialShape.PIE");
064
065 /** The name. */
066 private String name;
067
068 /**
069 * Private constructor.
070 *
071 * @param name the name.
072 */
073 private DialShape(String name) {
074 this.name = name;
075 }
076
077 /**
078 * Returns a string representing the object.
079 *
080 * @return The string.
081 */
082 public String toString() {
083 return this.name;
084 }
085
086 /**
087 * Returns <code>true</code> if this object is equal to the specified
088 * object, and <code>false</code> otherwise.
089 *
090 * @param obj the other object.
091 *
092 * @return A boolean.
093 */
094 public boolean equals(Object obj) {
095 if (this == obj) {
096 return true;
097 }
098 if (!(obj instanceof DialShape)) {
099 return false;
100 }
101 DialShape shape = (DialShape) obj;
102 if (!this.name.equals(shape.toString())) {
103 return false;
104 }
105 return true;
106 }
107
108 /**
109 * Returns a hash code for this instance.
110 *
111 * @return A hash code.
112 */
113 public int hashCode() {
114 return this.name.hashCode();
115 }
116
117 /**
118 * Ensures that serialization returns the unique instances.
119 *
120 * @return The object.
121 *
122 * @throws ObjectStreamException if there is a problem.
123 */
124 private Object readResolve() throws ObjectStreamException {
125 if (this.equals(DialShape.CIRCLE)) {
126 return DialShape.CIRCLE;
127 }
128 else if (this.equals(DialShape.CHORD)) {
129 return DialShape.CHORD;
130 }
131 else if (this.equals(DialShape.PIE)) {
132 return DialShape.PIE;
133 }
134 return null;
135 }
136
137 }