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Java > Open Source Codes > org > jfree > data > RangeType


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, 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  * RangeType.java
29  * --------------
30  * (C) Copyright 2005, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: RangeType.java,v 1.2.2.1 2005/10/25 21:29:13 mungady Exp $
36  *
37  * Changes:
38  * --------
39  * 24-Feb-2005 : Version 1 (DG);
40  *
41  */
42
43 package org.jfree.data;
44
45 import java.io.ObjectStreamException JavaDoc;
46 import java.io.Serializable JavaDoc;
47
48 /**
49  * Used to indicate the type of range to display on an axis (full, positive or
50  * negative).
51  */
52 public final class RangeType implements Serializable JavaDoc {
53
54     /** For serialization. */
55     private static final long serialVersionUID = -9073319010650549239L;
56      
57     /** Full range (positive and negative). */
58     public static final RangeType FULL = new RangeType("RangeType.FULL");
59
60     /** Positive range. */
61     public static final RangeType POSITIVE
62         = new RangeType("RangeType.POSITIVE");
63
64     /** Negative range. */
65     public static final RangeType NEGATIVE
66         = new RangeType("RangeType.NEGATIVE");
67
68     /** The name. */
69     private String JavaDoc name;
70
71     /**
72      * Private constructor.
73      *
74      * @param name the name.
75      */
76     private RangeType(String JavaDoc name) {
77         this.name = name;
78     }
79
80     /**
81      * Returns a string representing the object.
82      *
83      * @return The string.
84      */
85     public String JavaDoc toString() {
86         return this.name;
87     }
88
89     /**
90      * Returns <code>true</code> if this object is equal to the specified
91      * object, and <code>false</code> otherwise.
92      *
93      * @param obj the other object.
94      *
95      * @return A boolean.
96      */
97     public boolean equals(Object JavaDoc obj) {
98
99         if (this == obj) {
100             return true;
101         }
102         if (!(obj instanceof RangeType)) {
103             return false;
104         }
105         RangeType that = (RangeType) obj;
106         if (!this.name.equals(that.toString())) {
107             return false;
108         }
109         return true;
110     }
111     
112     /**
113      * Returns a hash code value for the object.
114      *
115      * @return The hashcode
116      */
117     public int hashCode() {
118         return this.name.hashCode();
119     }
120
121     /**
122      * Ensures that serialization returns the unique instances.
123      *
124      * @return The object.
125      *
126      * @throws ObjectStreamException if there is a problem.
127      */
128     private Object JavaDoc readResolve() throws ObjectStreamException JavaDoc {
129         if (this.equals(RangeType.FULL)) {
130             return RangeType.FULL;
131         }
132         else if (this.equals(RangeType.POSITIVE)) {
133             return RangeType.POSITIVE;
134         }
135         else if (this.equals(RangeType.NEGATIVE)) {
136             return RangeType.NEGATIVE;
137         }
138         return null;
139     }
140     
141 }
142
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