Sort members.
This commit is contained in:
Gary Gregory
parent
1f2003041b
commit
b5de0ef280
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@ -37,6 +37,21 @@
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*/
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public class LocaleUtils {
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//-----------------------------------------------------------------------
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// class to avoid synchronization (Init on demand)
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static class SyncAvoid {
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/** Unmodifiable list of available locales. */
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private static final List<Locale> AVAILABLE_LOCALE_LIST;
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/** Unmodifiable set of available locales. */
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private static final Set<Locale> AVAILABLE_LOCALE_SET;
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static {
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final List<Locale> list = new ArrayList<>(Arrays.asList(Locale.getAvailableLocales())); // extra safe
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AVAILABLE_LOCALE_LIST = Collections.unmodifiableList(list);
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AVAILABLE_LOCALE_SET = Collections.unmodifiableSet(new HashSet<>(list));
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}
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}
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/** Concurrent map of language locales by country. */
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private static final ConcurrentMap<String, List<Locale>> cLanguagesByCountry =
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new ConcurrentHashMap<>();
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@ -45,14 +60,220 @@ public class LocaleUtils {
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private static final ConcurrentMap<String, List<Locale>> cCountriesByLanguage =
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new ConcurrentHashMap<>();
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//-----------------------------------------------------------------------
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/**
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* <p>{@code LocaleUtils} instances should NOT be constructed in standard programming.
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* Instead, the class should be used as {@code LocaleUtils.toLocale("en_GB");}.</p>
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* <p>Obtains an unmodifiable list of installed locales.</p>
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*
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* <p>This constructor is public to permit tools that require a JavaBean instance
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* to operate.</p>
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* <p>This method is a wrapper around {@link Locale#getAvailableLocales()}.
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* It is more efficient, as the JDK method must create a new array each
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* time it is called.</p>
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*
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* @return the unmodifiable list of available locales
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*/
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public LocaleUtils() {
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public static List<Locale> availableLocaleList() {
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return SyncAvoid.AVAILABLE_LOCALE_LIST;
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains an unmodifiable set of installed locales.</p>
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*
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* <p>This method is a wrapper around {@link Locale#getAvailableLocales()}.
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* It is more efficient, as the JDK method must create a new array each
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* time it is called.</p>
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*
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* @return the unmodifiable set of available locales
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*/
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public static Set<Locale> availableLocaleSet() {
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return SyncAvoid.AVAILABLE_LOCALE_SET;
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains the list of countries supported for a given language.</p>
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*
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* <p>This method takes a language code and searches to find the
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* countries available for that language. Variant locales are removed.</p>
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*
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* @param languageCode the 2 letter language code, null returns empty
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* @return an unmodifiable List of Locale objects, not null
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*/
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public static List<Locale> countriesByLanguage(final String languageCode) {
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if (languageCode == null) {
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return Collections.emptyList();
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}
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List<Locale> countries = cCountriesByLanguage.get(languageCode);
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if (countries == null) {
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countries = new ArrayList<>();
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final List<Locale> locales = availableLocaleList();
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for (final Locale locale : locales) {
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if (languageCode.equals(locale.getLanguage()) &&
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!locale.getCountry().isEmpty() &&
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locale.getVariant().isEmpty()) {
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countries.add(locale);
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}
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}
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countries = Collections.unmodifiableList(countries);
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cCountriesByLanguage.putIfAbsent(languageCode, countries);
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countries = cCountriesByLanguage.get(languageCode);
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}
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return countries;
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Checks if the locale specified is in the list of available locales.</p>
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*
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* @param locale the Locale object to check if it is available
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* @return true if the locale is a known locale
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*/
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public static boolean isAvailableLocale(final Locale locale) {
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return availableLocaleList().contains(locale);
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}
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/**
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* Checks whether the given String is a ISO 3166 alpha-2 country code.
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*
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* @param str the String to check
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* @return true, is the given String is a ISO 3166 compliant country code.
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*/
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private static boolean isISO3166CountryCode(final String str) {
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return StringUtils.isAllUpperCase(str) && str.length() == 2;
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}
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/**
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* Checks whether the given String is a ISO 639 compliant language code.
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*
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* @param str the String to check.
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* @return true, if the given String is a ISO 639 compliant language code.
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*/
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private static boolean isISO639LanguageCode(final String str) {
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return StringUtils.isAllLowerCase(str) && (str.length() == 2 || str.length() == 3);
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}
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/**
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* Checks whether the given String is a UN M.49 numeric area code.
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*
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* @param str the String to check
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* @return true, is the given String is a UN M.49 numeric area code.
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*/
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private static boolean isNumericAreaCode(final String str) {
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return StringUtils.isNumeric(str) && str.length() == 3;
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains the list of languages supported for a given country.</p>
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*
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* <p>This method takes a country code and searches to find the
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* languages available for that country. Variant locales are removed.</p>
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*
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* @param countryCode the 2 letter country code, null returns empty
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* @return an unmodifiable List of Locale objects, not null
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*/
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public static List<Locale> languagesByCountry(final String countryCode) {
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if (countryCode == null) {
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return Collections.emptyList();
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}
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List<Locale> langs = cLanguagesByCountry.get(countryCode);
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if (langs == null) {
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langs = new ArrayList<>();
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final List<Locale> locales = availableLocaleList();
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for (final Locale locale : locales) {
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if (countryCode.equals(locale.getCountry()) &&
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locale.getVariant().isEmpty()) {
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langs.add(locale);
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}
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}
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langs = Collections.unmodifiableList(langs);
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cLanguagesByCountry.putIfAbsent(countryCode, langs);
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langs = cLanguagesByCountry.get(countryCode);
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}
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return langs;
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains the list of locales to search through when performing
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* a locale search.</p>
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*
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* <pre>
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* localeLookupList(Locale("fr", "CA", "xxx"))
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* = [Locale("fr", "CA", "xxx"), Locale("fr", "CA"), Locale("fr")]
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* </pre>
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*
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* @param locale the locale to start from
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* @return the unmodifiable list of Locale objects, 0 being locale, not null
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*/
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public static List<Locale> localeLookupList(final Locale locale) {
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return localeLookupList(locale, locale);
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains the list of locales to search through when performing
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* a locale search.</p>
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*
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* <pre>
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* localeLookupList(Locale("fr", "CA", "xxx"), Locale("en"))
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* = [Locale("fr", "CA", "xxx"), Locale("fr", "CA"), Locale("fr"), Locale("en"]
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* </pre>
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*
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* <p>The result list begins with the most specific locale, then the
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* next more general and so on, finishing with the default locale.
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* The list will never contain the same locale twice.</p>
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*
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* @param locale the locale to start from, null returns empty list
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* @param defaultLocale the default locale to use if no other is found
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* @return the unmodifiable list of Locale objects, 0 being locale, not null
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*/
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public static List<Locale> localeLookupList(final Locale locale, final Locale defaultLocale) {
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final List<Locale> list = new ArrayList<>(4);
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if (locale != null) {
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list.add(locale);
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if (!locale.getVariant().isEmpty()) {
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list.add(new Locale(locale.getLanguage(), locale.getCountry()));
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}
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if (!locale.getCountry().isEmpty()) {
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list.add(new Locale(locale.getLanguage(), StringUtils.EMPTY));
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}
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if (!list.contains(defaultLocale)) {
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list.add(defaultLocale);
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}
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}
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return Collections.unmodifiableList(list);
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}
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/**
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* Tries to parse a locale from the given String.
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*
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* @param str the String to parse a locale from.
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* @return a Locale instance parsed from the given String.
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* @throws IllegalArgumentException if the given String can not be parsed.
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*/
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private static Locale parseLocale(final String str) {
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if (isISO639LanguageCode(str)) {
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return new Locale(str);
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}
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final String[] segments = str.split("_", -1);
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final String language = segments[0];
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if (segments.length == 2) {
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final String country = segments[1];
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if (isISO639LanguageCode(language) && isISO3166CountryCode(country) ||
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isNumericAreaCode(country)) {
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return new Locale(language, country);
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}
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} else if (segments.length == 3) {
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final String country = segments[1];
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final String variant = segments[2];
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if (isISO639LanguageCode(language) &&
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(country.isEmpty() || isISO3166CountryCode(country) || isNumericAreaCode(country)) &&
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!variant.isEmpty()) {
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return new Locale(language, country, variant);
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}
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}
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throw new IllegalArgumentException("Invalid locale format: " + str);
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}
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//-----------------------------------------------------------------------
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@ -126,234 +347,13 @@ public static Locale toLocale(final String str) {
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}
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/**
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* Tries to parse a locale from the given String.
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* <p>{@code LocaleUtils} instances should NOT be constructed in standard programming.
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* Instead, the class should be used as {@code LocaleUtils.toLocale("en_GB");}.</p>
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*
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* @param str the String to parse a locale from.
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* @return a Locale instance parsed from the given String.
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* @throws IllegalArgumentException if the given String can not be parsed.
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* <p>This constructor is public to permit tools that require a JavaBean instance
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* to operate.</p>
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*/
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private static Locale parseLocale(final String str) {
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if (isISO639LanguageCode(str)) {
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return new Locale(str);
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}
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final String[] segments = str.split("_", -1);
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final String language = segments[0];
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if (segments.length == 2) {
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final String country = segments[1];
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if (isISO639LanguageCode(language) && isISO3166CountryCode(country) ||
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isNumericAreaCode(country)) {
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return new Locale(language, country);
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}
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} else if (segments.length == 3) {
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final String country = segments[1];
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final String variant = segments[2];
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if (isISO639LanguageCode(language) &&
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(country.isEmpty() || isISO3166CountryCode(country) || isNumericAreaCode(country)) &&
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!variant.isEmpty()) {
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return new Locale(language, country, variant);
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}
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}
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throw new IllegalArgumentException("Invalid locale format: " + str);
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}
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/**
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* Checks whether the given String is a ISO 639 compliant language code.
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*
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* @param str the String to check.
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* @return true, if the given String is a ISO 639 compliant language code.
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*/
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private static boolean isISO639LanguageCode(final String str) {
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return StringUtils.isAllLowerCase(str) && (str.length() == 2 || str.length() == 3);
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}
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/**
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* Checks whether the given String is a ISO 3166 alpha-2 country code.
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*
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* @param str the String to check
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* @return true, is the given String is a ISO 3166 compliant country code.
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*/
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private static boolean isISO3166CountryCode(final String str) {
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return StringUtils.isAllUpperCase(str) && str.length() == 2;
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}
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/**
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* Checks whether the given String is a UN M.49 numeric area code.
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*
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* @param str the String to check
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* @return true, is the given String is a UN M.49 numeric area code.
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*/
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private static boolean isNumericAreaCode(final String str) {
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return StringUtils.isNumeric(str) && str.length() == 3;
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains the list of locales to search through when performing
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* a locale search.</p>
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*
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* <pre>
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* localeLookupList(Locale("fr", "CA", "xxx"))
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* = [Locale("fr", "CA", "xxx"), Locale("fr", "CA"), Locale("fr")]
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* </pre>
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*
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* @param locale the locale to start from
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* @return the unmodifiable list of Locale objects, 0 being locale, not null
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*/
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public static List<Locale> localeLookupList(final Locale locale) {
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return localeLookupList(locale, locale);
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains the list of locales to search through when performing
|
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* a locale search.</p>
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*
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* <pre>
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* localeLookupList(Locale("fr", "CA", "xxx"), Locale("en"))
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* = [Locale("fr", "CA", "xxx"), Locale("fr", "CA"), Locale("fr"), Locale("en"]
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* </pre>
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*
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* <p>The result list begins with the most specific locale, then the
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* next more general and so on, finishing with the default locale.
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* The list will never contain the same locale twice.</p>
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*
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* @param locale the locale to start from, null returns empty list
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* @param defaultLocale the default locale to use if no other is found
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* @return the unmodifiable list of Locale objects, 0 being locale, not null
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*/
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public static List<Locale> localeLookupList(final Locale locale, final Locale defaultLocale) {
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final List<Locale> list = new ArrayList<>(4);
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if (locale != null) {
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list.add(locale);
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if (!locale.getVariant().isEmpty()) {
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list.add(new Locale(locale.getLanguage(), locale.getCountry()));
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}
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if (!locale.getCountry().isEmpty()) {
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list.add(new Locale(locale.getLanguage(), StringUtils.EMPTY));
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}
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if (!list.contains(defaultLocale)) {
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list.add(defaultLocale);
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}
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}
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return Collections.unmodifiableList(list);
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains an unmodifiable list of installed locales.</p>
|
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*
|
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* <p>This method is a wrapper around {@link Locale#getAvailableLocales()}.
|
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* It is more efficient, as the JDK method must create a new array each
|
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* time it is called.</p>
|
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*
|
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* @return the unmodifiable list of available locales
|
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*/
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public static List<Locale> availableLocaleList() {
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return SyncAvoid.AVAILABLE_LOCALE_LIST;
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}
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//-----------------------------------------------------------------------
|
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/**
|
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* <p>Obtains an unmodifiable set of installed locales.</p>
|
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*
|
||||
* <p>This method is a wrapper around {@link Locale#getAvailableLocales()}.
|
||||
* It is more efficient, as the JDK method must create a new array each
|
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* time it is called.</p>
|
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*
|
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* @return the unmodifiable set of available locales
|
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*/
|
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public static Set<Locale> availableLocaleSet() {
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return SyncAvoid.AVAILABLE_LOCALE_SET;
|
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}
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//-----------------------------------------------------------------------
|
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/**
|
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* <p>Checks if the locale specified is in the list of available locales.</p>
|
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*
|
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* @param locale the Locale object to check if it is available
|
||||
* @return true if the locale is a known locale
|
||||
*/
|
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public static boolean isAvailableLocale(final Locale locale) {
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return availableLocaleList().contains(locale);
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}
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//-----------------------------------------------------------------------
|
||||
/**
|
||||
* <p>Obtains the list of languages supported for a given country.</p>
|
||||
*
|
||||
* <p>This method takes a country code and searches to find the
|
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* languages available for that country. Variant locales are removed.</p>
|
||||
*
|
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* @param countryCode the 2 letter country code, null returns empty
|
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* @return an unmodifiable List of Locale objects, not null
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*/
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public static List<Locale> languagesByCountry(final String countryCode) {
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if (countryCode == null) {
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return Collections.emptyList();
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}
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List<Locale> langs = cLanguagesByCountry.get(countryCode);
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if (langs == null) {
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langs = new ArrayList<>();
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final List<Locale> locales = availableLocaleList();
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for (final Locale locale : locales) {
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if (countryCode.equals(locale.getCountry()) &&
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locale.getVariant().isEmpty()) {
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langs.add(locale);
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}
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}
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langs = Collections.unmodifiableList(langs);
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cLanguagesByCountry.putIfAbsent(countryCode, langs);
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langs = cLanguagesByCountry.get(countryCode);
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}
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return langs;
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}
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//-----------------------------------------------------------------------
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/**
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* <p>Obtains the list of countries supported for a given language.</p>
|
||||
*
|
||||
* <p>This method takes a language code and searches to find the
|
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* countries available for that language. Variant locales are removed.</p>
|
||||
*
|
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* @param languageCode the 2 letter language code, null returns empty
|
||||
* @return an unmodifiable List of Locale objects, not null
|
||||
*/
|
||||
public static List<Locale> countriesByLanguage(final String languageCode) {
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if (languageCode == null) {
|
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return Collections.emptyList();
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||||
}
|
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List<Locale> countries = cCountriesByLanguage.get(languageCode);
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||||
if (countries == null) {
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countries = new ArrayList<>();
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final List<Locale> locales = availableLocaleList();
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for (final Locale locale : locales) {
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if (languageCode.equals(locale.getLanguage()) &&
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!locale.getCountry().isEmpty() &&
|
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locale.getVariant().isEmpty()) {
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countries.add(locale);
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}
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}
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countries = Collections.unmodifiableList(countries);
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cCountriesByLanguage.putIfAbsent(languageCode, countries);
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countries = cCountriesByLanguage.get(languageCode);
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}
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return countries;
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}
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//-----------------------------------------------------------------------
|
||||
// class to avoid synchronization (Init on demand)
|
||||
static class SyncAvoid {
|
||||
/** Unmodifiable list of available locales. */
|
||||
private static final List<Locale> AVAILABLE_LOCALE_LIST;
|
||||
/** Unmodifiable set of available locales. */
|
||||
private static final Set<Locale> AVAILABLE_LOCALE_SET;
|
||||
|
||||
static {
|
||||
final List<Locale> list = new ArrayList<>(Arrays.asList(Locale.getAvailableLocales())); // extra safe
|
||||
AVAILABLE_LOCALE_LIST = Collections.unmodifiableList(list);
|
||||
AVAILABLE_LOCALE_SET = Collections.unmodifiableSet(new HashSet<>(list));
|
||||
}
|
||||
public LocaleUtils() {
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue