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Java > Open Source Codes > nextapp > echo2 > app > LayoutDirection


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.app;
31
32 import java.io.Serializable JavaDoc;
33 import java.util.Collection JavaDoc;
34 import java.util.Collections JavaDoc;
35 import java.util.HashSet JavaDoc;
36 import java.util.Locale JavaDoc;
37
38 /**
39  * Describes the layout direction of text and content to provide support
40  * for bidirectional localization.
41  */
42 public class LayoutDirection
43 implements Serializable JavaDoc {
44     
45     private static final Collection JavaDoc RTL_LANGUAGES;
46     static {
47         Collection JavaDoc rtlLanguages = new HashSet JavaDoc();
48         rtlLanguages.add("ar"); // Arabic
49 rtlLanguages.add("fa"); // Persian
50 rtlLanguages.add("iw"); // Hebrew
51 rtlLanguages.add("ur"); // Urdu
52 RTL_LANGUAGES = Collections.unmodifiableCollection(rtlLanguages);
53     }
54     
55     public static final LayoutDirection LTR = new LayoutDirection(true);
56     public static final LayoutDirection RTL = new LayoutDirection(false);
57     
58     /**
59      * Returns the default <code>LayoutDirection</code> for the specified
60      * <code>Locale</code>.
61      *
62      * @param locale the locale
63      * @return the default layout direction
64      */
65     public static LayoutDirection forLocale(Locale JavaDoc locale) {
66         return RTL_LANGUAGES.contains(locale.getLanguage()) ? RTL : LTR;
67     }
68     
69     private boolean leftToRight;
70     
71     /**
72      * Creates a new <code>LayoutDirection</code>
73      *
74      * @param leftToRight a flag indicating whether the layout direction
75      * is left-to-right.
76      */
77     private LayoutDirection(boolean leftToRight) {
78         super();
79         this.leftToRight = leftToRight;
80     }
81     
82     /**
83      * Determines if the <code>LayoutDirection</code> is left-to-right.
84      *
85      * @return true if the <code>LayoutDirection</code> is left-to-right.
86      */
87     public boolean isLeftToRight() {
88         return leftToRight;
89     }
90     
91     /**
92      * @see java.lang.Object#toString()
93      */
94     public String JavaDoc toString() {
95         return leftToRight ? "LTR" : "RTL";
96     }
97 }
98
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