1 /*
2 * Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26
27 package javax.print.attribute;
28
29 import java.io.Serializable;
30 import java.util.Locale;
31
32 /**
33 * Class TextSyntax is an abstract base class providing the common
34 * implementation of all attributes whose value is a string. The text attribute
35 * includes a locale to indicate the natural language. Thus, a text attribute
36 * always represents a localized string. Once constructed, a text attribute's
37 * value is immutable.
38 * <P>
39 *
40 * @author David Mendenhall
41 * @author Alan Kaminsky
42 */
43 public abstract class TextSyntax implements Serializable, Cloneable {
44
45 private static final long serialVersionUID = -8130648736378144102L;
46
47 /**
48 * String value of this text attribute.
49 * @serial
50 */
51 private String value;
52
53 /**
54 * Locale of this text attribute.
55 * @serial
56 */
57 private Locale locale;
58
59 /**
60 * Constructs a TextAttribute with the specified string and locale.
61 *
62 * @param value Text string.
63 * @param locale Natural language of the text string. null
64 * is interpreted to mean the default locale for as returned
65 * by <code>Locale.getDefault()</code>
66 *
67 * @exception NullPointerException
68 * (unchecked exception) Thrown if <CODE>value</CODE> is null.
69 */
70 protected TextSyntax(String value, Locale locale) {
71 this.value = verify (value);
72 this.locale = verify (locale);
73 }
74
75 private static String verify(String value) {
76 if (value == null) {
77 throw new NullPointerException(" value is null");
78 }
79 return value;
80 }
81
82 private static Locale verify(Locale locale) {
83 if (locale == null) {
84 return Locale.getDefault();
85 }
86 return locale;
87 }
88
89 /**
90 * Returns this text attribute's text string.
91 * @return the text string.
92 */
93 public String getValue() {
94 return value;
95 }
96
97 /**
98 * Returns this text attribute's text string's natural language (locale).
99 * @return the locale
100 */
101 public Locale getLocale() {
102 return locale;
103 }
104
105 /**
106 * Returns a hashcode for this text attribute.
107 *
108 * @return A hashcode value for this object.
109 */
110 public int hashCode() {
111 return value.hashCode() ^ locale.hashCode();
112 }
113
114 /**
115 * Returns whether this text attribute is equivalent to the passed in
116 * object. To be equivalent, all of the following conditions must be true:
117 * <OL TYPE=1>
118 * <LI>
119 * <CODE>object</CODE> is not null.
120 * <LI>
121 * <CODE>object</CODE> is an instance of class TextSyntax.
122 * <LI>
123 * This text attribute's underlying string and <CODE>object</CODE>'s
124 * underlying string are equal.
125 * <LI>
126 * This text attribute's locale and <CODE>object</CODE>'s locale are
127 * equal.
128 * </OL>
129 *
130 * @param object Object to compare to.
131 *
132 * @return True if <CODE>object</CODE> is equivalent to this text
133 * attribute, false otherwise.
134 */
135 public boolean equals(Object object) {
136 return(object != null &&
137 object instanceof TextSyntax &&
138 this.value.equals (((TextSyntax) object).value) &&
139 this.locale.equals (((TextSyntax) object).locale));
140 }
141
142 /**
143 * Returns a String identifying this text attribute. The String is
144 * the attribute's underlying text string.
145 *
146 * @return A String identifying this object.
147 */
148 public String toString(){
149 return value;
150 }
151
152 }
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