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Java > Open Source Codes > org > jfree > util > UnitType


1 /* ========================================================================
2  * JCommon : a free general purpose class 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/jcommon/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  * UnitType.java
29  * -------------
30  * (C) Copyright 2004, 2005, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: UnitType.java,v 1.7 2005/10/18 13:24:19 mungady Exp $
36  *
37  * Changes:
38  * --------
39  * 11-Feb-2004 : Version 1 (DG);
40  *
41  */
42
43 package org.jfree.util;
44
45 import java.io.ObjectStreamException JavaDoc;
46 import java.io.Serializable JavaDoc;
47
48 /**
49  * Used to indicate absolute or relative units.
50  *
51  * @author David Gilbert
52  */
53 public final class UnitType implements Serializable JavaDoc {
54
55     /** For serialization. */
56     private static final long serialVersionUID = 6531925392288519884L;
57     
58     /** Absolute. */
59     public static final UnitType ABSOLUTE = new UnitType("UnitType.ABSOLUTE");
60
61     /** Relative. */
62     public static final UnitType RELATIVE = new UnitType("UnitType.RELATIVE");
63
64     /** The name. */
65     private String JavaDoc name;
66
67     /**
68      * Private constructor.
69      *
70      * @param name the name.
71      */
72     private UnitType(final String JavaDoc name) {
73         this.name = name;
74     }
75
76     /**
77      * Returns a string representing the object.
78      *
79      * @return The string.
80      */
81     public String JavaDoc toString() {
82         return this.name;
83     }
84
85     /**
86      * Returns <code>true</code> if this object is equal to the specified
87      * object, and <code>false</code> otherwise.
88      *
89      * @param obj the other object.
90      *
91      * @return A boolean.
92      */
93     public boolean equals(final Object JavaDoc obj) {
94         if (obj == this) {
95             return true;
96         }
97         if (!(obj instanceof UnitType)) {
98             return false;
99         }
100         final UnitType that = (UnitType) obj;
101         if (!this.name.equals(that.name)) {
102             return false;
103         }
104         return true;
105     }
106
107     /**
108      * Returns a hash code value for the object.
109      *
110      * @return The hashcode
111      */
112     public int hashCode() {
113         return this.name.hashCode();
114     }
115
116     /**
117      * Ensures that serialization returns the unique instances.
118      *
119      * @return The object.
120      *
121      * @throws ObjectStreamException if there is a problem.
122      */
123     private Object JavaDoc readResolve() throws ObjectStreamException JavaDoc {
124         if (this.equals(UnitType.ABSOLUTE)) {
125             return UnitType.ABSOLUTE;
126         }
127         else if (this.equals(UnitType.RELATIVE)) {
128             return UnitType.RELATIVE;
129         }
130         return null;
131     }
132     
133 }
134
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