01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * 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;
33: import java.util.Collection;
34: import java.util.Collections;
35: import java.util.HashSet;
36: import java.util.Locale;
37:
38: /**
39: * Describes the layout direction of text and content to provide support
40: * for bidirectional localization.
41: */
42: public class LayoutDirection implements Serializable {
43:
44: private static final Collection RTL_LANGUAGES;
45: static {
46: Collection rtlLanguages = new HashSet();
47: rtlLanguages.add("ar"); // Arabic
48: rtlLanguages.add("fa"); // Persian
49: rtlLanguages.add("iw"); // Hebrew
50: rtlLanguages.add("ur"); // Urdu
51: RTL_LANGUAGES = Collections
52: .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 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 toString() {
95: return leftToRight ? "LTR" : "RTL";
96: }
97: }
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