Class LocaleUtils
- java.lang.Object
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- org.apache.myfaces.core.api.shared.lang.LocaleUtils
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public class LocaleUtils extends Object
Operations to assist when working with a
Locale
.This class tries to handle
NOTE: This a copy of commons lang LocaleUtils, to use it inside MyFacesnull
input gracefully. An exception will not be thrown for anull
input. Each method documents its behaviour in more detail.- Since:
- 2.2
- Version:
- $Id$
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Constructor Summary
Constructors Constructor Description LocaleUtils()
_LocaleUtils
instances should NOT be constructed in standard programming.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static List<Locale>
availableLocaleList()
Obtains an unmodifiable list of installed locales.static Set<Locale>
availableLocaleSet()
Obtains an unmodifiable set of installed locales.static List<Locale>
countriesByLanguage(String languageCode)
Obtains the list of countries supported for a given language.static Locale
deriveLocale(String str)
Same as toLocale(), but return null when it cannot derive a valid Locale object.static boolean
isAvailableLocale(Locale locale)
Checks if the locale specified is in the list of available locales.static List<Locale>
languagesByCountry(String countryCode)
Obtains the list of languages supported for a given country.static List<Locale>
localeLookupList(Locale locale)
Obtains the list of locales to search through when performing a locale search.static List<Locale>
localeLookupList(Locale locale, Locale defaultLocale)
Obtains the list of locales to search through when performing a locale search.static Locale
toLocale(String str)
Converts a String to a Locale.
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Method Detail
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toLocale
public static Locale toLocale(String str)
Converts a String to a Locale.
This method takes the string format of a locale and creates the locale object from it.
_LocaleUtils.toLocale("en") = new Locale("en", "") _LocaleUtils.toLocale("en_GB") = new Locale("en", "GB") _LocaleUtils.toLocale("en_GB_xxx") = new Locale("en", "GB", "xxx") (#)
(#) The behaviour of the JDK variant constructor changed between JDK1.3 and JDK1.4. In JDK1.3, the constructor upper cases the variant, in JDK1.4, it doesn't. Thus, the result from getVariant() may vary depending on your JDK.
This method validates the input strictly. The language code must be lowercase. The country code must be uppercase. The separator must be an underscore. The length must be correct.
- Parameters:
str
- the locale String to convert, null returns null- Returns:
- a Locale, null if null input
- Throws:
IllegalArgumentException
- if the string is an invalid format
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deriveLocale
public static Locale deriveLocale(String str)
Same as toLocale(), but return null when it cannot derive a valid Locale object.- Parameters:
str
-- Returns:
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localeLookupList
public static List<Locale> localeLookupList(Locale locale)
Obtains the list of locales to search through when performing a locale search.
localeLookupList(Locale("fr","CA","xxx")) = [Locale("fr","CA","xxx"), Locale("fr","CA"), Locale("fr")]
- Parameters:
locale
- the locale to start from- Returns:
- the unmodifiable list of Locale objects, 0 being locale, not null
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localeLookupList
public static List<Locale> localeLookupList(Locale locale, Locale defaultLocale)
Obtains the list of locales to search through when performing a locale search.
localeLookupList(Locale("fr", "CA", "xxx"), Locale("en")) = [Locale("fr","CA","xxx"), Locale("fr","CA"), Locale("fr"), Locale("en"]
The result list begins with the most specific locale, then the next more general and so on, finishing with the default locale. The list will never contain the same locale twice.
- Parameters:
locale
- the locale to start from, null returns empty listdefaultLocale
- the default locale to use if no other is found- Returns:
- the unmodifiable list of Locale objects, 0 being locale, not null
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availableLocaleList
public static List<Locale> availableLocaleList()
Obtains an unmodifiable list of installed locales.
This method is a wrapper around
Locale.getAvailableLocales()
. It is more efficient, as the JDK method must create a new array each time it is called.- Returns:
- the unmodifiable list of available locales
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availableLocaleSet
public static Set<Locale> availableLocaleSet()
Obtains an unmodifiable set of installed locales.
This method is a wrapper around
Locale.getAvailableLocales()
. It is more efficient, as the JDK method must create a new array each time it is called.- Returns:
- the unmodifiable set of available locales
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isAvailableLocale
public static boolean isAvailableLocale(Locale locale)
Checks if the locale specified is in the list of available locales.
- Parameters:
locale
- the Locale object to check if it is available- Returns:
- true if the locale is a known locale
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languagesByCountry
public static List<Locale> languagesByCountry(String countryCode)
Obtains the list of languages supported for a given country.
This method takes a country code and searches to find the languages available for that country. Variant locales are removed.
- Parameters:
countryCode
- the 2 letter country code, null returns empty- Returns:
- an unmodifiable List of Locale objects, not null
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countriesByLanguage
public static List<Locale> countriesByLanguage(String languageCode)
Obtains the list of countries supported for a given language.
This method takes a language code and searches to find the countries available for that language. Variant locales are removed.
- Parameters:
languageCode
- the 2 letter language code, null returns empty- Returns:
- an unmodifiable List of Locale objects, not null
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