Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
_LocaleUtils |
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| 5.777777777777778;5.778 | ||||
_LocaleUtils$SyncAvoid |
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| 5.777777777777778;5.778 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one | |
3 | * or more contributor license agreements. See the NOTICE file | |
4 | * distributed with this work for additional information | |
5 | * regarding copyright ownership. The ASF licenses this file | |
6 | * to you under the Apache License, Version 2.0 (the | |
7 | * "License"); you may not use this file except in compliance | |
8 | * with the License. You may obtain a copy of the License at | |
9 | * | |
10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
11 | * | |
12 | * Unless required by applicable law or agreed to in writing, | |
13 | * software distributed under the License is distributed on an | |
14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
15 | * KIND, either express or implied. See the License for the | |
16 | * specific language governing permissions and limitations | |
17 | * under the License. | |
18 | */ | |
19 | package javax.faces.component; | |
20 | ||
21 | import java.util.ArrayList; | |
22 | import java.util.Arrays; | |
23 | import java.util.Collections; | |
24 | import java.util.HashSet; | |
25 | import java.util.List; | |
26 | import java.util.Locale; | |
27 | import java.util.Set; | |
28 | import java.util.concurrent.ConcurrentHashMap; | |
29 | import java.util.concurrent.ConcurrentMap; | |
30 | ||
31 | /** | |
32 | * <p>Operations to assist when working with a {@link Locale}.</p> | |
33 | * | |
34 | * <p>This class tries to handle {@code null} input gracefully. | |
35 | * An exception will not be thrown for a {@code null} input. | |
36 | * Each method documents its behaviour in more detail.</p> | |
37 | * | |
38 | * NOTE: This a copy of commons lang LocaleUtils, to use it inside MyFaces | |
39 | * | |
40 | * @since 2.2 | |
41 | * @version $Id$ | |
42 | */ | |
43 | class _LocaleUtils | |
44 | { | |
45 | ||
46 | /** Concurrent map of language locales by country. */ | |
47 | 0 | private static final ConcurrentMap<String, List<Locale>> LANGUAGES_BY_COUNTRY = |
48 | new ConcurrentHashMap<String, List<Locale>>(); | |
49 | ||
50 | /** Concurrent map of country locales by language. */ | |
51 | 0 | private static final ConcurrentMap<String, List<Locale>> COUNTRIES_BY_LANGUAGE = |
52 | new ConcurrentHashMap<String, List<Locale>>(); | |
53 | ||
54 | /** | |
55 | * <p>{@code _LocaleUtils} instances should NOT be constructed in standard programming. | |
56 | * Instead, the class should be used as {@code _LocaleUtils.toLocale("en_GB");}.</p> | |
57 | * | |
58 | * <p>This constructor is public to permit tools that require a JavaBean instance | |
59 | * to operate.</p> | |
60 | */ | |
61 | public _LocaleUtils() | |
62 | { | |
63 | 0 | super(); |
64 | 0 | } |
65 | ||
66 | //----------------------------------------------------------------------- | |
67 | ||
68 | /** | |
69 | * <p>Converts a String to a Locale.</p> | |
70 | * | |
71 | * <p>This method takes the string format of a locale and creates the | |
72 | * locale object from it.</p> | |
73 | * | |
74 | * <pre> | |
75 | * _LocaleUtils.toLocale("en") = new Locale("en", "") | |
76 | * _LocaleUtils.toLocale("en_GB") = new Locale("en", "GB") | |
77 | * _LocaleUtils.toLocale("en_GB_xxx") = new Locale("en", "GB", "xxx") (#) | |
78 | * </pre> | |
79 | * | |
80 | * <p>(#) The behaviour of the JDK variant constructor changed between JDK1.3 and JDK1.4. | |
81 | * In JDK1.3, the constructor upper cases the variant, in JDK1.4, it doesn't. | |
82 | * Thus, the result from getVariant() may vary depending on your JDK.</p> | |
83 | * | |
84 | * <p>This method validates the input strictly. | |
85 | * The language code must be lowercase. | |
86 | * The country code must be uppercase. | |
87 | * The separator must be an underscore. | |
88 | * The length must be correct. | |
89 | * </p> | |
90 | * | |
91 | * @param str the locale String to convert, null returns null | |
92 | * @return a Locale, null if null input | |
93 | * @throws IllegalArgumentException if the string is an invalid format | |
94 | */ | |
95 | public static Locale toLocale(String str) | |
96 | { | |
97 | 0 | if (str == null) |
98 | { | |
99 | 0 | return null; |
100 | } | |
101 | 0 | int len = str.length(); |
102 | 0 | if (len != 2 && len != 5 && len < 7) |
103 | { | |
104 | 0 | throw new IllegalArgumentException("Invalid locale format: " + str); |
105 | } | |
106 | 0 | char ch0 = str.charAt(0); |
107 | 0 | char ch1 = str.charAt(1); |
108 | 0 | if (ch0 < 'a' || ch0 > 'z' || ch1 < 'a' || ch1 > 'z') |
109 | { | |
110 | 0 | throw new IllegalArgumentException("Invalid locale format: " + str); |
111 | } | |
112 | 0 | if (len == 2) |
113 | { | |
114 | 0 | return new Locale(str, ""); |
115 | } | |
116 | else | |
117 | { | |
118 | 0 | if (str.charAt(2) != '_') |
119 | { | |
120 | 0 | throw new IllegalArgumentException("Invalid locale format: " + str); |
121 | } | |
122 | 0 | char ch3 = str.charAt(3); |
123 | 0 | if (ch3 == '_') |
124 | { | |
125 | 0 | return new Locale(str.substring(0, 2), "", str.substring(4)); |
126 | } | |
127 | 0 | char ch4 = str.charAt(4); |
128 | 0 | if (ch3 < 'A' || ch3 > 'Z' || ch4 < 'A' || ch4 > 'Z') |
129 | { | |
130 | 0 | throw new IllegalArgumentException("Invalid locale format: " + str); |
131 | } | |
132 | 0 | if (len == 5) |
133 | { | |
134 | 0 | return new Locale(str.substring(0, 2), str.substring(3, 5)); |
135 | } | |
136 | else | |
137 | { | |
138 | 0 | if (str.charAt(5) != '_') |
139 | { | |
140 | 0 | throw new IllegalArgumentException("Invalid locale format: " + str); |
141 | } | |
142 | 0 | return new Locale(str.substring(0, 2), str.substring(3, 5), str.substring(6)); |
143 | } | |
144 | } | |
145 | } | |
146 | ||
147 | //----------------------------------------------------------------------- | |
148 | ||
149 | /** | |
150 | * <p>Obtains the list of locales to search through when performing | |
151 | * a locale search.</p> | |
152 | * | |
153 | * <pre> | |
154 | * localeLookupList(Locale("fr","CA","xxx")) | |
155 | * = [Locale("fr","CA","xxx"), Locale("fr","CA"), Locale("fr")] | |
156 | * </pre> | |
157 | * | |
158 | * @param locale the locale to start from | |
159 | * @return the unmodifiable list of Locale objects, 0 being locale, not null | |
160 | */ | |
161 | public static List<Locale> localeLookupList(Locale locale) | |
162 | { | |
163 | 0 | return localeLookupList(locale, locale); |
164 | } | |
165 | ||
166 | //----------------------------------------------------------------------- | |
167 | ||
168 | /** | |
169 | * <p>Obtains the list of locales to search through when performing | |
170 | * a locale search.</p> | |
171 | * | |
172 | * <pre> | |
173 | * localeLookupList(Locale("fr", "CA", "xxx"), Locale("en")) | |
174 | * = [Locale("fr","CA","xxx"), Locale("fr","CA"), Locale("fr"), Locale("en"] | |
175 | * </pre> | |
176 | * | |
177 | * <p>The result list begins with the most specific locale, then the | |
178 | * next more general and so on, finishing with the default locale. | |
179 | * The list will never contain the same locale twice.</p> | |
180 | * | |
181 | * @param locale the locale to start from, null returns empty list | |
182 | * @param defaultLocale the default locale to use if no other is found | |
183 | * @return the unmodifiable list of Locale objects, 0 being locale, not null | |
184 | */ | |
185 | public static List<Locale> localeLookupList(Locale locale, Locale defaultLocale) | |
186 | { | |
187 | 0 | List<Locale> list = new ArrayList<Locale>(4); |
188 | 0 | if (locale != null) |
189 | { | |
190 | 0 | list.add(locale); |
191 | 0 | if (locale.getVariant().length() > 0) |
192 | { | |
193 | 0 | list.add(new Locale(locale.getLanguage(), locale.getCountry())); |
194 | } | |
195 | 0 | if (locale.getCountry().length() > 0) |
196 | { | |
197 | 0 | list.add(new Locale(locale.getLanguage(), "")); |
198 | } | |
199 | 0 | if (!list.contains(defaultLocale)) |
200 | { | |
201 | 0 | list.add(defaultLocale); |
202 | } | |
203 | } | |
204 | 0 | return Collections.unmodifiableList(list); |
205 | } | |
206 | ||
207 | //----------------------------------------------------------------------- | |
208 | ||
209 | /** | |
210 | * <p>Obtains an unmodifiable list of installed locales.</p> | |
211 | * | |
212 | * <p>This method is a wrapper around {@link Locale#getAvailableLocales()}. | |
213 | * It is more efficient, as the JDK method must create a new array each | |
214 | * time it is called.</p> | |
215 | * | |
216 | * @return the unmodifiable list of available locales | |
217 | */ | |
218 | public static List<Locale> availableLocaleList() | |
219 | { | |
220 | 0 | return SyncAvoid.AVAILABLE_LOCALE_LIST; |
221 | } | |
222 | ||
223 | //----------------------------------------------------------------------- | |
224 | ||
225 | /** | |
226 | * <p>Obtains an unmodifiable set of installed locales.</p> | |
227 | * | |
228 | * <p>This method is a wrapper around {@link Locale#getAvailableLocales()}. | |
229 | * It is more efficient, as the JDK method must create a new array each | |
230 | * time it is called.</p> | |
231 | * | |
232 | * @return the unmodifiable set of available locales | |
233 | */ | |
234 | public static Set<Locale> availableLocaleSet() | |
235 | { | |
236 | 0 | return SyncAvoid.AVAILABLE_LOCALE_SET; |
237 | } | |
238 | ||
239 | //----------------------------------------------------------------------- | |
240 | ||
241 | /** | |
242 | * <p>Checks if the locale specified is in the list of available locales.</p> | |
243 | * | |
244 | * @param locale the Locale object to check if it is available | |
245 | * @return true if the locale is a known locale | |
246 | */ | |
247 | public static boolean isAvailableLocale(Locale locale) | |
248 | { | |
249 | 0 | return availableLocaleList().contains(locale); |
250 | } | |
251 | ||
252 | //----------------------------------------------------------------------- | |
253 | ||
254 | /** | |
255 | * <p>Obtains the list of languages supported for a given country.</p> | |
256 | * | |
257 | * <p>This method takes a country code and searches to find the | |
258 | * languages available for that country. Variant locales are removed.</p> | |
259 | * | |
260 | * @param countryCode the 2 letter country code, null returns empty | |
261 | * @return an unmodifiable List of Locale objects, not null | |
262 | */ | |
263 | public static List<Locale> languagesByCountry(String countryCode) | |
264 | { | |
265 | 0 | if (countryCode == null) |
266 | { | |
267 | 0 | return Collections.emptyList(); |
268 | } | |
269 | 0 | List<Locale> langs = LANGUAGES_BY_COUNTRY.get(countryCode); |
270 | 0 | if (langs == null) |
271 | { | |
272 | 0 | langs = new ArrayList<Locale>(); |
273 | 0 | List<Locale> locales = availableLocaleList(); |
274 | 0 | for (int i = 0; i < locales.size(); i++) |
275 | { | |
276 | 0 | Locale locale = locales.get(i); |
277 | 0 | if (countryCode.equals(locale.getCountry()) && |
278 | locale.getVariant().length() == 0) | |
279 | { | |
280 | 0 | langs.add(locale); |
281 | } | |
282 | } | |
283 | 0 | langs = Collections.unmodifiableList(langs); |
284 | 0 | LANGUAGES_BY_COUNTRY.putIfAbsent(countryCode, langs); |
285 | 0 | langs = LANGUAGES_BY_COUNTRY.get(countryCode); |
286 | } | |
287 | 0 | return langs; |
288 | } | |
289 | ||
290 | //----------------------------------------------------------------------- | |
291 | ||
292 | /** | |
293 | * <p>Obtains the list of countries supported for a given language.</p> | |
294 | * | |
295 | * <p>This method takes a language code and searches to find the | |
296 | * countries available for that language. Variant locales are removed.</p> | |
297 | * | |
298 | * @param languageCode the 2 letter language code, null returns empty | |
299 | * @return an unmodifiable List of Locale objects, not null | |
300 | */ | |
301 | public static List<Locale> countriesByLanguage(String languageCode) | |
302 | { | |
303 | 0 | if (languageCode == null) |
304 | { | |
305 | 0 | return Collections.emptyList(); |
306 | } | |
307 | 0 | List<Locale> countries = COUNTRIES_BY_LANGUAGE.get(languageCode); |
308 | 0 | if (countries == null) |
309 | { | |
310 | 0 | countries = new ArrayList<Locale>(); |
311 | 0 | List<Locale> locales = availableLocaleList(); |
312 | 0 | for (int i = 0; i < locales.size(); i++) |
313 | { | |
314 | 0 | Locale locale = locales.get(i); |
315 | 0 | if (languageCode.equals(locale.getLanguage()) && |
316 | locale.getCountry().length() != 0 && | |
317 | locale.getVariant().length() == 0) | |
318 | { | |
319 | 0 | countries.add(locale); |
320 | } | |
321 | } | |
322 | 0 | countries = Collections.unmodifiableList(countries); |
323 | 0 | COUNTRIES_BY_LANGUAGE.putIfAbsent(languageCode, countries); |
324 | 0 | countries = COUNTRIES_BY_LANGUAGE.get(languageCode); |
325 | } | |
326 | 0 | return countries; |
327 | } | |
328 | ||
329 | //----------------------------------------------------------------------- | |
330 | // class to avoid synchronization | |
331 | 0 | static class SyncAvoid |
332 | { | |
333 | /** Unmodifiable list of available locales. */ | |
334 | private static final List<Locale> AVAILABLE_LOCALE_LIST; | |
335 | /** Unmodifiable set of available locales. */ | |
336 | private static final Set<Locale> AVAILABLE_LOCALE_SET; | |
337 | ||
338 | static | |
339 | { | |
340 | 0 | List<Locale> list = new ArrayList<Locale>(Arrays.asList(Locale.getAvailableLocales())); // extra safe |
341 | 0 | AVAILABLE_LOCALE_LIST = Collections.unmodifiableList(list); |
342 | 0 | AVAILABLE_LOCALE_SET = Collections.unmodifiableSet(new HashSet<Locale>(availableLocaleList())); |
343 | 0 | } |
344 | } | |
345 | ||
346 | } |