1 /* LocaleHelper.java -- helper routines for localization
2 Copyright (C) 2004, 2005 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
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18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
39 package gnu.java.locale;
41 import java.text.Collator;
42 import java.util.Locale;
43 import java.util.MissingResourceException;
44 import java.util.ResourceBundle;
47 * This class provides common helper methods
48 * for handling localized data.
50 * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
52 * @see java.util.Locale
53 * @see java.util.ResourceBundle
55 public class LocaleHelper
59 * This method is used by the localized name lookup methods to
60 * retrieve the next locale to try. The next locale is derived
61 * from the supplied locale by applying the first applicable
62 * rule from the following:
65 * <li>If the variant contains a <code>'_'</code>, then
66 * this and everything following it is trimmed.</li>
67 * <li>If the variant is non-empty, it is converted to
68 * an empty string.</li>
69 * <li>If the country is non-empty, it is converted to
70 * an empty string.</li>
71 * <li>If the language is non-empty, it is converted to
72 * an empty string (forming {@link java.util.Locale#ROOT})</li>
75 * The base fallback locale is {@link java.util.Locale#ROOT}.
78 * @param locale the locale for which a localized piece of
79 * data could not be obtained.
80 * @return the next fallback locale to try.
82 public static Locale getFallbackLocale(Locale locale)
84 String language = locale.getLanguage();
85 String country = locale.getCountry();
86 String variant = locale.getVariant();
87 int uscore = variant.indexOf('_');
89 return new Locale(language, country,
90 variant.substring(0, uscore));
91 if (!variant.isEmpty())
92 return new Locale(language, country, "");
93 if (!country.isEmpty())
94 return new Locale(language, "", "");
99 * Return an array of all the locales for which there is a
100 * {@link Collator} instance. A new array is returned each time.
102 public static Locale[] getCollatorLocales()
104 // For now we don't bother caching. This is probably
105 // not called very frequently. And, we would have to
106 // clone the array anyway.
107 if (LocaleData.collatorLocaleNames.length == 0)
108 return new Locale[] { Locale.US };
109 Locale[] result = new Locale[LocaleData.collatorLocaleNames.length];
110 for (int i = 0; i < result.length; ++i)
115 String name = LocaleData.collatorLocaleNames[i];
117 language = name.substring(0, 2);
119 if (name.length() > 2)
120 region = name.substring(3);
122 int index = region.indexOf("_");
125 variant = region.substring(index + 1);
126 region = region.substring(0, index - 1);
129 result[i] = new Locale(language, region, variant);
135 * Return the number of locales we know of.
137 public static int getLocaleCount()
139 return LocaleData.localeNames.length;
143 * Return the Nth locale name.
145 public static String getLocaleName(int n)
147 return LocaleData.localeNames[n];