ULocale

public final class ULocale extends Object
implements Serializable Comparable<ULocale>

[icu enhancement] ICU's replacement for Locale. Methods, fields, and other functionality specific to ICU are labeled '[icu]'. A class analogous to Locale that provides additional support for ICU protocol. In ICU 3.0 this class is enhanced to support RFC 3066 language identifiers.

Many classes and services in ICU follow a factory idiom, in which a factory method or object responds to a client request with an object. The request includes a locale (the requested locale), and the returned object is constructed using data for that locale. The system may lack data for the requested locale, in which case the locale fallback mechanism will be invoked until a populated locale is found (the valid locale). Furthermore, even when a populated locale is found (the valid locale), further fallback may be required to reach a locale containing the specific data required by the service (the actual locale).

ULocale performs 'normalization' and 'canonicalization' of locale ids. Normalization 'cleans up' ICU locale ids as follows:

  • language, script, country, variant, and keywords are properly cased
    (lower, title, upper, upper, and lower case respectively)
  • hyphens used as separators are converted to underscores
  • three-letter language and country ids are converted to two-letter equivalents where available
  • surrounding spaces are removed from keywords and values
  • if there are multiple keywords, they are put in sorted order
Canonicalization additionally performs the following:
  • POSIX ids are converted to ICU format IDs
  • 'grandfathered' 3066 ids are converted to ICU standard form
  • 'PREEURO' and 'EURO' variants are converted to currency keyword form, with the currency id appropriate to the country of the locale (for PREEURO) or EUR (for EURO).
All ULocale constructors automatically normalize the locale id. To handle POSIX ids, canonicalize can be called to convert the id to canonical form, or the canonicalInstance factory method can be called.

Note: The actual locale is returned correctly, but the valid locale is not, in most cases.

See Also

Nested Class Summary

class ULocale.Builder Builder is used to build instances of ULocale from values configured by the setters. 
enum ULocale.Category Enum for locale categories. 

Constant Summary

char PRIVATE_USE_EXTENSION The key for the private use locale extension ('x').
char UNICODE_LOCALE_EXTENSION The key for Unicode locale extension ('u').

Field Summary

public static final ULocale CANADA Useful constant for country/region.
public static final ULocale CANADA_FRENCH Useful constant for country/region.
public static final ULocale CHINA Useful constant for country/region.
public static final ULocale CHINESE Useful constant for language.
public static final ULocale ENGLISH Useful constant for language.
public static final ULocale FRANCE Useful constant for country/region.
public static final ULocale FRENCH Useful constant for language.
public static final ULocale GERMAN Useful constant for language.
public static final ULocale GERMANY Useful constant for country/region.
public static final ULocale ITALIAN Useful constant for language.
public static final ULocale ITALY Useful constant for country/region.
public static final ULocale JAPAN Useful constant for country/region.
public static final ULocale JAPANESE Useful constant for language.
public static final ULocale KOREA Useful constant for country/region.
public static final ULocale KOREAN Useful constant for language.
public static final ULocale PRC Useful constant for country/region.
public static final ULocale ROOT The root ULocale.
public static final ULocale SIMPLIFIED_CHINESE Useful constant for language.
public static final ULocale TAIWAN Useful constant for country/region.
public static final ULocale TRADITIONAL_CHINESE Useful constant for language.
public static final ULocale UK Useful constant for country/region.
public static final ULocale US Useful constant for country/region.

Public Constructor Summary

ULocale(String localeID)
[icu] Constructs a ULocale from a RFC 3066 locale ID.
ULocale(String a, String b)
Convenience overload of ULocale(String, String, String) for compatibility with java.util.Locale.
ULocale(String a, String b, String c)
Constructs a ULocale from a localeID constructed from the three 'fields' a, b, and c.

Public Method Summary

static ULocale
acceptLanguage(ULocale[] acceptLanguageList, boolean[] fallback)
[icu] Based on an ordered array of acceptable locales, determine an available locale for the user.
static ULocale
acceptLanguage(String acceptLanguageList, ULocale[] availableLocales, boolean[] fallback)
[icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user.
static ULocale
acceptLanguage(ULocale[] acceptLanguageList, ULocale[] availableLocales, boolean[] fallback)
[icu] Based on a list of acceptable locales, determine an available locale for the user.
static ULocale
acceptLanguage(String acceptLanguageList, boolean[] fallback)
[icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user.
static ULocale
addLikelySubtags(ULocale loc)
[icu] Adds the likely subtags for a provided locale ID, per the algorithm described in the following CLDR technical report: http://www.unicode.org/reports/tr35/#Likely_Subtags If the provided ULocale instance is already in the maximal form, or there is no data available available for maximization, it will be returned.
static String
canonicalize(String localeID)
[icu] Returns the canonical name for the specified locale ID.
Object
clone()
This is for compatibility with Locale-- in actuality, since ULocale is immutable, there is no reason to clone it, so this API returns 'this'.
int
compareTo(ULocale other)
Compares two ULocale for ordering.
static ULocale
createCanonical(String nonCanonicalID)
[icu] Creates a ULocale from the id by first canonicalizing the id.
boolean
equals(Object obj)
Returns true if the other object is another ULocale with the same full name.
static ULocale
forLanguageTag(String languageTag)
Returns a locale for the specified IETF BCP 47 language tag string.
static ULocale
forLocale(Locale loc)
[icu] Returns a ULocale object for a Locale.
static ULocale[]
getAvailableLocales()
[icu] Note: Unlike the Locale API, this returns an array of ULocale, not Locale.
String
getBaseName()
[icu] Returns the (normalized) base name for this locale, like getName(), but without keywords.
static String
getBaseName(String localeID)
[icu] Returns the (normalized) base name for the specified locale, like getName(String), but without keywords.
String
getCharacterOrientation()
[icu] Returns this locale's layout orientation for characters.
static String
getCountry(String localeID)
[icu] Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.
String
getCountry()
Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.
static ULocale
getDefault()
Returns the current default ULocale.
static ULocale
getDefault(ULocale.Category category)
Returns the current default ULocale for the specified category.
String
getDisplayCountry()
Returns this locale's country localized for display in the default DISPLAY locale.
static String
getDisplayCountry(String localeID, String displayLocaleID)
[icu] Returns a locale's country localized for display in the provided locale.
String
getDisplayCountry(ULocale displayLocale)
Returns this locale's country localized for display in the provided locale.
static String
getDisplayCountry(String localeID, ULocale displayLocale)
[icu] Returns a locale's country localized for display in the provided locale.
static String
getDisplayKeyword(String keyword, ULocale displayLocale)
[icu] Returns a keyword localized for display in the specified locale.
static String
getDisplayKeyword(String keyword, String displayLocaleID)
[icu] Returns a keyword localized for display in the specified locale.
static String
getDisplayKeyword(String keyword)
[icu] Returns a keyword localized for display in the default DISPLAY locale.
static String
getDisplayKeywordValue(String localeID, String keyword, String displayLocaleID)
[icu] Returns a keyword value localized for display in the specified locale.
static String
getDisplayKeywordValue(String localeID, String keyword, ULocale displayLocale)
[icu] Returns a keyword value localized for display in the specified locale.
String
getDisplayKeywordValue(String keyword)
[icu] Returns a keyword value localized for display in the default DISPLAY locale.
String
getDisplayKeywordValue(String keyword, ULocale displayLocale)
[icu] Returns a keyword value localized for display in the specified locale.
String
getDisplayLanguage(ULocale displayLocale)
Returns this locale's language localized for display in the provided locale.
static String
getDisplayLanguage(String localeID, ULocale displayLocale)
[icu] Returns a locale's language localized for display in the provided locale.
static String
getDisplayLanguage(String localeID, String displayLocaleID)
[icu] Returns a locale's language localized for display in the provided locale.
String
getDisplayLanguage()
Returns this locale's language localized for display in the default DISPLAY locale.
String
getDisplayLanguageWithDialect(ULocale displayLocale)
[icu] Returns this locale's language localized for display in the provided locale.
static String
getDisplayLanguageWithDialect(String localeID, String displayLocaleID)
[icu] Returns a locale's language localized for display in the provided locale.
static String
getDisplayLanguageWithDialect(String localeID, ULocale displayLocale)
[icu] Returns a locale's language localized for display in the provided locale.
String
getDisplayLanguageWithDialect()
[icu] Returns this locale's language localized for display in the default DISPLAY locale.
String
getDisplayName()
Returns this locale name localized for display in the default DISPLAY locale.
String
getDisplayName(ULocale displayLocale)
Returns this locale name localized for display in the provided locale.
static String
getDisplayName(String localeID, String displayLocaleID)
[icu] Returns the locale ID localized for display in the provided locale.
static String
getDisplayName(String localeID, ULocale displayLocale)
[icu] Returns the locale ID localized for display in the provided locale.
static String
getDisplayNameWithDialect(String localeID, String displayLocaleID)
[icu] Returns the locale ID localized for display in the provided locale.
static String
getDisplayNameWithDialect(String localeID, ULocale displayLocale)
[icu] Returns the locale ID localized for display in the provided locale.
String
getDisplayNameWithDialect(ULocale displayLocale)
[icu] Returns this locale name localized for display in the provided locale.
String
getDisplayNameWithDialect()
[icu] Returns this locale name localized for display in the default DISPLAY locale.
static String
getDisplayScript(String localeID, String displayLocaleID)
[icu] Returns a locale's script localized for display in the provided locale.
static String
getDisplayScript(String localeID, ULocale displayLocale)
[icu] Returns a locale's script localized for display in the provided locale.
String
getDisplayScript()
Returns this locale's script localized for display in the default DISPLAY locale.
String
getDisplayScript(ULocale displayLocale)
Returns this locale's script localized for display in the provided locale.
static String
getDisplayVariant(String localeID, String displayLocaleID)
[icu] Returns a locale's variant localized for display in the provided locale.
String
getDisplayVariant()
Returns this locale's variant localized for display in the default DISPLAY locale.
String
getDisplayVariant(ULocale displayLocale)
Returns this locale's variant localized for display in the provided locale.
static String
getDisplayVariant(String localeID, ULocale displayLocale)
[icu] Returns a locale's variant localized for display in the provided locale.
String
getExtension(char key)
Returns the extension (or private use) value associated with the specified key, or null if there is no extension associated with the key.
Set<Character>
getExtensionKeys()
Returns the set of extension keys associated with this locale, or the empty set if it has no extensions.
ULocale
getFallback()
[icu] Returns the fallback locale for this locale.
static String
getFallback(String localeID)
[icu] Returns the fallback locale for the specified locale, which might be the empty string.
String
getISO3Country()
Returns a three-letter abbreviation for this locale's country/region.
static String
getISO3Country(String localeID)
[icu] Returns a three-letter abbreviation for this locale's country/region.
String
getISO3Language()
Returns a three-letter abbreviation for this locale's language.
static String
getISO3Language(String localeID)
[icu] Returns a three-letter abbreviation for this locale's language.
static String[]
getISOCountries()
Returns a list of all 2-letter country codes defined in ISO 3166.
static String[]
getISOLanguages()
Returns a list of all 2-letter language codes defined in ISO 639.
static String
getKeywordValue(String localeID, String keywordName)
[icu] Returns the value for a keyword in the specified locale.
String
getKeywordValue(String keywordName)
[icu] Returns the value for a keyword in this locale.
static Iterator<String>
getKeywords(String localeID)
[icu] Returns an iterator over keywords for the specified locale.
Iterator<String>
getKeywords()
[icu] Returns an iterator over keywords for this locale.
static String
getLanguage(String localeID)
Returns the language code for the locale ID, which will either be the empty string or a lowercase ISO 639 code.
String
getLanguage()
Returns the language code for this locale, which will either be the empty string or a lowercase ISO 639 code.
String
getLineOrientation()
[icu] Returns this locale's layout orientation for lines.
String
getName()
[icu] Returns the (normalized) full name for this locale.
static String
getName(String localeID)
[icu] Returns the (normalized) full name for the specified locale.
String
getScript()
Returns the script code for this locale, which might be the empty string.
static String
getScript(String localeID)
[icu] Returns the script code for the specified locale, which might be the empty string.
Set<String>
getUnicodeLocaleAttributes()
Returns the set of unicode locale attributes associated with this locale, or the empty set if it has no attributes.
Set<String>
getUnicodeLocaleKeys()
Returns the set of Unicode locale keys defined by this locale, or the empty set if this locale has none.
String
getUnicodeLocaleType(String key)
Returns the Unicode locale type associated with the specified Unicode locale key for this locale.
String
getVariant()
Returns the variant code for this locale, which might be the empty string.
static String
getVariant(String localeID)
[icu] Returns the variant code for the specified locale, which might be the empty string.
int
hashCode()
Returns the hashCode.
boolean
isRightToLeft()
[icu] Returns whether this locale's script is written right-to-left.
static ULocale
minimizeSubtags(ULocale loc)
[icu] Minimizes the subtags for a provided locale ID, per the algorithm described in the following CLDR technical report:
http://www.unicode.org/reports/tr35/#Likely_Subtags
If the provided ULocale instance is already in the minimal form, or there is no data available for minimization, it will be returned.
ULocale
setKeywordValue(String keyword, String value)
[icu] Given a keyword and a value, return a new locale with an updated keyword and value.
static String
setKeywordValue(String localeID, String keyword, String value)
Given a locale id, a keyword, and a value, return a new locale id with an updated keyword and value.
String
toLanguageTag()
Returns a well-formed IETF BCP 47 language tag representing this locale.
static String
toLegacyKey(String keyword)
[icu] Converts the specified keyword (BCP 47 Unicode locale extension key, or legacy key) to the legacy key.
static String
toLegacyType(String keyword, String value)
[icu] Converts the specified keyword value (BCP 47 Unicode locale extension type, or legacy type or type alias) to the canonical legacy type.
Locale
toLocale()
[icu] Converts this ULocale object to a Locale.
String
toString()
Returns a string representation of this object.
static String
toUnicodeLocaleKey(String keyword)
[icu] Converts the specified keyword (legacy key, or BCP 47 Unicode locale extension key) to the equivalent BCP 47 Unicode locale extension key.
static String
toUnicodeLocaleType(String keyword, String value)
[icu] Converts the specified keyword value (legacy type, or BCP 47 Unicode locale extension type) to the well-formed BCP 47 Unicode locale extension type for the specified keyword (category).

Inherited Method Summary

Constants

public static final char PRIVATE_USE_EXTENSION

The key for the private use locale extension ('x').

Constant Value: 120

public static final char UNICODE_LOCALE_EXTENSION

The key for Unicode locale extension ('u').

Constant Value: 117

Fields

public static final ULocale CANADA

Useful constant for country/region.

public static final ULocale CANADA_FRENCH

Useful constant for country/region.

public static final ULocale CHINA

Useful constant for country/region.

public static final ULocale CHINESE

Useful constant for language.

public static final ULocale ENGLISH

Useful constant for language.

public static final ULocale FRANCE

Useful constant for country/region.

public static final ULocale FRENCH

Useful constant for language.

public static final ULocale GERMAN

Useful constant for language.

public static final ULocale GERMANY

Useful constant for country/region.

public static final ULocale ITALIAN

Useful constant for language.

public static final ULocale ITALY

Useful constant for country/region.

public static final ULocale JAPAN

Useful constant for country/region.

public static final ULocale JAPANESE

Useful constant for language.

public static final ULocale KOREA

Useful constant for country/region.

public static final ULocale KOREAN

Useful constant for language.

public static final ULocale PRC

Useful constant for country/region.

public static final ULocale ROOT

The root ULocale.

public static final ULocale SIMPLIFIED_CHINESE

Useful constant for language.

public static final ULocale TAIWAN

Useful constant for country/region.

public static final ULocale TRADITIONAL_CHINESE

Useful constant for language.

public static final ULocale UK

Useful constant for country/region.

public static final ULocale US

Useful constant for country/region.

Public Constructors

public ULocale (String localeID)

[icu] Constructs a ULocale from a RFC 3066 locale ID. The locale ID consists of optional language, script, country, and variant fields in that order, separated by underscores, followed by an optional keyword list. The script, if present, is four characters long-- this distinguishes it from a country code, which is two characters long. Other fields are distinguished by position as indicated by the underscores. The start of the keyword list is indicated by '@', and consists of two or more keyword/value pairs separated by semicolons(';').

This constructor does not canonicalize the localeID. So, for example, "zh__pinyin" remains unchanged instead of converting to "zh@collation=pinyin". By default ICU only recognizes the latter as specifying pinyin collation. Use createCanonical(String) or canonicalize(String) if you need to canonicalize the localeID.

Parameters
localeID string representation of the locale, e.g: "en_US", "sy_Cyrl_YU", "zh__pinyin", "es_ES@currency=EUR;collation=traditional"

public ULocale (String a, String b)

Convenience overload of ULocale(String, String, String) for compatibility with java.util.Locale.

Parameters
a
b

public ULocale (String a, String b, String c)

Constructs a ULocale from a localeID constructed from the three 'fields' a, b, and c. These fields are concatenated using underscores to form a localeID of the form a_b_c, which is then handled like the localeID passed to ULocale(String localeID).

Java locale strings consisting of language, country, and variant will be handled by this form, since the country code (being shorter than four letters long) will not be interpreted as a script code. If a script code is present, the final argument ('c') will be interpreted as the country code. It is recommended that this constructor only be used to ease porting, and that clients instead use the single-argument constructor when constructing a ULocale from a localeID.

Parameters
a first component of the locale id
b second component of the locale id
c third component of the locale id
See Also

Public Methods

public static ULocale acceptLanguage (ULocale[] acceptLanguageList, boolean[] fallback)

[icu] Based on an ordered array of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case. This function will choose a locale from the ULocale.getAvailableLocales() list as available.

Parameters
acceptLanguageList ordered array of acceptable locales (preferred are listed first)
fallback if non-null, a 1-element array containing a boolean to be set with the fallback status
Returns
  • one of the locales from the ULocale.getAvailableLocales() list, or null if none match

public static ULocale acceptLanguage (String acceptLanguageList, ULocale[] availableLocales, boolean[] fallback)

[icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case.

Parameters
acceptLanguageList list in HTTP "Accept-Language:" format of acceptable locales
availableLocales list of available locales. One of these will be returned.
fallback if non-null, a 1-element array containing a boolean to be set with the fallback status
Returns
  • one of the locales from the availableLocales list, or null if none match

public static ULocale acceptLanguage (ULocale[] acceptLanguageList, ULocale[] availableLocales, boolean[] fallback)

[icu] Based on a list of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case.

Parameters
acceptLanguageList list of acceptable locales
availableLocales list of available locales. One of these will be returned.
fallback if non-null, a 1-element array containing a boolean to be set with the fallback status
Returns
  • one of the locales from the availableLocales list, or null if none match

public static ULocale acceptLanguage (String acceptLanguageList, boolean[] fallback)

[icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case. This function will choose a locale from the ULocale.getAvailableLocales() list as available.

Parameters
acceptLanguageList list in HTTP "Accept-Language:" format of acceptable locales
fallback if non-null, a 1-element array containing a boolean to be set with the fallback status
Returns
  • one of the locales from the ULocale.getAvailableLocales() list, or null if none match

public static ULocale addLikelySubtags (ULocale loc)

[icu] Adds the likely subtags for a provided locale ID, per the algorithm described in the following CLDR technical report: http://www.unicode.org/reports/tr35/#Likely_Subtags If the provided ULocale instance is already in the maximal form, or there is no data available available for maximization, it will be returned. For example, "und-Zzzz" cannot be maximized, since there is no reasonable maximization. Otherwise, a new ULocale instance with the maximal form is returned. Examples: "en" maximizes to "en_Latn_US" "de" maximizes to "de_Latn_US" "sr" maximizes to "sr_Cyrl_RS" "sh" maximizes to "sr_Latn_RS" (Note this will not reverse.) "zh_Hani" maximizes to "zh_Hans_CN" (Note this will not reverse.)

Parameters
loc The ULocale to maximize
Returns
  • The maximized ULocale instance.

public static String canonicalize (String localeID)

[icu] Returns the canonical name for the specified locale ID. This is used to convert POSIX and other grandfathered IDs to standard ICU form.

Parameters
localeID the locale id
Returns
  • the canonicalized id

public Object clone ()

This is for compatibility with Locale-- in actuality, since ULocale is immutable, there is no reason to clone it, so this API returns 'this'.

Returns
  • a copy of this object.

public int compareTo (ULocale other)

Compares two ULocale for ordering.

Note: The order might change in future.

Parameters
other the ULocale to be compared.
Returns
  • a negative integer, zero, or a positive integer as this ULocale is less than, equal to, or greater than the specified ULocale.
Throws
NullPointerException if other is null.

public static ULocale createCanonical (String nonCanonicalID)

[icu] Creates a ULocale from the id by first canonicalizing the id.

Parameters
nonCanonicalID the locale id to canonicalize
Returns
  • the locale created from the canonical version of the ID.

public boolean equals (Object obj)

Returns true if the other object is another ULocale with the same full name. Note that since names are not canonicalized, two ULocales that function identically might not compare equal.

Parameters
obj the object to compare this instance with.
Returns
  • true if this Locale is equal to the specified object.

public static ULocale forLanguageTag (String languageTag)

Returns a locale for the specified IETF BCP 47 language tag string.

If the specified language tag contains any ill-formed subtags, the first such subtag and all following subtags are ignored. Compare to setLanguageTag(String) which throws an exception in this case.

The following conversions are performed:

  • The language code "und" is mapped to language "".
  • The portion of a private use subtag prefixed by "lvariant", if any, is removed and appended to the variant field in the result locale (without case normalization). If it is then empty, the private use subtag is discarded:
         ULocale loc;
         loc = ULocale.forLanguageTag("en-US-x-lvariant-icu4j);
         loc.getVariant(); // returns "ICU4J"
         loc.getExtension('x'); // returns null
    
         loc = Locale.forLanguageTag("de-icu4j-x-URP-lvariant-Abc-Def");
         loc.getVariant(); // returns "ICU4J_ABC_DEF"
         loc.getExtension('x'); // returns "urp"
     
  • When the languageTag argument contains an extlang subtag, the first such subtag is used as the language, and the primary language subtag and other extlang subtags are ignored:
         ULocale.forLanguageTag("ar-aao").getLanguage(); // returns "aao"
         ULocale.forLanguageTag("en-abc-def-us").toString(); // returns "abc_US"
     
  • Case is normalized. Language is normalized to lower case, script to title case, country to upper case, variant to upper case, and extensions to lower case.

This implements the 'Language-Tag' production of BCP47, and so supports grandfathered (regular and irregular) as well as private use language tags. Stand alone private use tags are represented as empty language and extension 'x-whatever', and grandfathered tags are converted to their canonical replacements where they exist.

Grandfathered tags with canonical replacements are as follows:

grandfathered tag modern replacement
art-lojban jbo
i-ami ami
i-bnn bnn
i-hak hak
i-klingon tlh
i-lux lb
i-navajo nv
i-pwn pwn
i-tao tao
i-tay tay
i-tsu tsu
no-bok nb
no-nyn nn
sgn-BE-FR sfb
sgn-BE-NL vgt
sgn-CH-DE sgg
zh-guoyu cmn
zh-hakka hak
zh-min-nan nan
zh-xiang hsn

Grandfathered tags with no modern replacement will be converted as follows:

grandfathered tag converts to
cel-gaulish xtg-x-cel-gaulish
en-GB-oed en-GB-x-oed
i-default en-x-i-default
i-enochian und-x-i-enochian
i-mingo see-x-i-mingo
zh-min nan-x-zh-min

For a list of all grandfathered tags, see the IANA Language Subtag Registry (search for "Type: grandfathered").

Note: there is no guarantee that toLanguageTag and forLanguageTag will round-trip.

Parameters
languageTag the language tag
Returns
  • The locale that best represents the language tag.
Throws
NullPointerException if languageTag is null

public static ULocale forLocale (Locale loc)

[icu] Returns a ULocale object for a Locale. The ULocale is canonicalized.

Parameters
loc a Locale

public static ULocale[] getAvailableLocales ()

[icu] Note: Unlike the Locale API, this returns an array of ULocale, not Locale. Returns a list of all installed locales.

public String getBaseName ()

[icu] Returns the (normalized) base name for this locale, like getName(), but without keywords.

Returns
  • the base name as a String.

public static String getBaseName (String localeID)

[icu] Returns the (normalized) base name for the specified locale, like getName(String), but without keywords.

Parameters
localeID the locale ID as a string
Returns
  • the base name as a String.

public String getCharacterOrientation ()

[icu] Returns this locale's layout orientation for characters. The possible values are "left-to-right", "right-to-left", "top-to-bottom" or "bottom-to-top".

Returns
  • The locale's layout orientation for characters.

public static String getCountry (String localeID)

[icu] Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.

Parameters
localeID The locale identification string.

public String getCountry ()

Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.

public static ULocale getDefault ()

Returns the current default ULocale.

The default ULocale is synchronized to the default Java Locale. This method checks the current default Java Locale and returns an equivalent ULocale.

Returns
  • the default ULocale.

public static ULocale getDefault (ULocale.Category category)

Returns the current default ULocale for the specified category.

Parameters
category the category
Returns
  • the default ULocale for the specified category.

public String getDisplayCountry ()

Returns this locale's country localized for display in the default DISPLAY locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use LocaleDisplayNames instead.

Returns
  • the localized country name.
See Also

public static String getDisplayCountry (String localeID, String displayLocaleID)

[icu] Returns a locale's country localized for display in the provided locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use LocaleDisplayNames instead. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose country will be displayed
displayLocaleID the id of the locale in which to display the name.
Returns
  • the localized country name.

public String getDisplayCountry (ULocale displayLocale)

Returns this locale's country localized for display in the provided locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use LocaleDisplayNames instead.

Parameters
displayLocale the locale in which to display the name.
Returns
  • the localized country name.

public static String getDisplayCountry (String localeID, ULocale displayLocale)

[icu] Returns a locale's country localized for display in the provided locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use LocaleDisplayNames instead. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose country will be displayed.
displayLocale the locale in which to display the name.
Returns
  • the localized country name.

public static String getDisplayKeyword (String keyword, ULocale displayLocale)

[icu] Returns a keyword localized for display in the specified locale.

Parameters
keyword the keyword to be displayed.
displayLocale the locale in which to display the keyword.
Returns
  • the localized keyword name.

public static String getDisplayKeyword (String keyword, String displayLocaleID)

[icu] Returns a keyword localized for display in the specified locale.

Parameters
keyword the keyword to be displayed.
displayLocaleID the id of the locale in which to display the keyword.
Returns
  • the localized keyword name.

public static String getDisplayKeyword (String keyword)

[icu] Returns a keyword localized for display in the default DISPLAY locale.

Parameters
keyword the keyword to be displayed.
Returns
  • the localized keyword name.

public static String getDisplayKeywordValue (String localeID, String keyword, String displayLocaleID)

[icu] Returns a keyword value localized for display in the specified locale. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose keyword value is to be displayed.
keyword the keyword whose value is to be displayed.
displayLocaleID the id of the locale in which to display the value.
Returns
  • the localized value name.

public static String getDisplayKeywordValue (String localeID, String keyword, ULocale displayLocale)

[icu] Returns a keyword value localized for display in the specified locale. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose keyword value is to be displayed.
keyword the keyword whose value is to be displayed.
displayLocale the id of the locale in which to display the value.
Returns
  • the localized value name.

public String getDisplayKeywordValue (String keyword)

[icu] Returns a keyword value localized for display in the default DISPLAY locale.

Parameters
keyword the keyword whose value is to be displayed.
Returns
  • the localized value name.
See Also

public String getDisplayKeywordValue (String keyword, ULocale displayLocale)

[icu] Returns a keyword value localized for display in the specified locale.

Parameters
keyword the keyword whose value is to be displayed.
displayLocale the locale in which to display the value.
Returns
  • the localized value name.

public String getDisplayLanguage (ULocale displayLocale)

Returns this locale's language localized for display in the provided locale.

Parameters
displayLocale the locale in which to display the name.
Returns
  • the localized language name.

public static String getDisplayLanguage (String localeID, ULocale displayLocale)

[icu] Returns a locale's language localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose language will be displayed.
displayLocale the locale in which to display the name.
Returns
  • the localized language name.

public static String getDisplayLanguage (String localeID, String displayLocaleID)

[icu] Returns a locale's language localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose language will be displayed
displayLocaleID the id of the locale in which to display the name.
Returns
  • the localized language name.

public String getDisplayLanguage ()

Returns this locale's language localized for display in the default DISPLAY locale.

Returns
  • the localized language name.
See Also

public String getDisplayLanguageWithDialect (ULocale displayLocale)

[icu] Returns this locale's language localized for display in the provided locale. If a dialect name is present in the data, then it is returned.

Parameters
displayLocale the locale in which to display the name.
Returns
  • the localized language name.

public static String getDisplayLanguageWithDialect (String localeID, String displayLocaleID)

[icu] Returns a locale's language localized for display in the provided locale. If a dialect name is present in the data, then it is returned. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose language will be displayed
displayLocaleID the id of the locale in which to display the name.
Returns
  • the localized language name.

public static String getDisplayLanguageWithDialect (String localeID, ULocale displayLocale)

[icu] Returns a locale's language localized for display in the provided locale. If a dialect name is present in the data, then it is returned. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose language will be displayed.
displayLocale the locale in which to display the name.
Returns
  • the localized language name.

public String getDisplayLanguageWithDialect ()

[icu] Returns this locale's language localized for display in the default DISPLAY locale. If a dialect name is present in the data, then it is returned.

Returns
  • the localized language name.
See Also

public String getDisplayName ()

Returns this locale name localized for display in the default DISPLAY locale.

Returns
  • the localized locale name.
See Also

public String getDisplayName (ULocale displayLocale)

Returns this locale name localized for display in the provided locale.

Parameters
displayLocale the locale in which to display the locale name.
Returns
  • the localized locale name.

public static String getDisplayName (String localeID, String displayLocaleID)

[icu] Returns the locale ID localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters
localeID the locale whose name is to be displayed.
displayLocaleID the id of the locale in which to display the locale name.
Returns
  • the localized locale name.

public static String getDisplayName (String localeID, ULocale displayLocale)

[icu] Returns the locale ID localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters
localeID the locale whose name is to be displayed.
displayLocale the locale in which to display the locale name.
Returns
  • the localized locale name.

public static String getDisplayNameWithDialect (String localeID, String displayLocaleID)

[icu] Returns the locale ID localized for display in the provided locale. If a dialect name is present in the locale data, then it is returned. This is a cover for the ICU4C API.

Parameters
localeID the locale whose name is to be displayed.
displayLocaleID the id of the locale in which to display the locale name.
Returns
  • the localized locale name.

public static String getDisplayNameWithDialect (String localeID, ULocale displayLocale)

[icu] Returns the locale ID localized for display in the provided locale. If a dialect name is present in the locale data, then it is returned. This is a cover for the ICU4C API.

Parameters
localeID the locale whose name is to be displayed.
displayLocale the locale in which to display the locale name.
Returns
  • the localized locale name.

public String getDisplayNameWithDialect (ULocale displayLocale)

[icu] Returns this locale name localized for display in the provided locale. If a dialect name is present in the locale data, then it is returned.

Parameters
displayLocale the locale in which to display the locale name.
Returns
  • the localized locale name.

public String getDisplayNameWithDialect ()

[icu] Returns this locale name localized for display in the default DISPLAY locale. If a dialect name is present in the locale data, then it is returned.

Returns
  • the localized locale name.
See Also

public static String getDisplayScript (String localeID, String displayLocaleID)

[icu] Returns a locale's script localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose script will be displayed
displayLocaleID the id of the locale in which to display the name.
Returns
  • the localized script name.

public static String getDisplayScript (String localeID, ULocale displayLocale)

[icu] Returns a locale's script localized for display in the provided locale.

Parameters
localeID the id of the locale whose script will be displayed.
displayLocale the locale in which to display the name.
Returns
  • the localized script name.

public String getDisplayScript ()

Returns this locale's script localized for display in the default DISPLAY locale.

Returns
  • the localized script name.
See Also

public String getDisplayScript (ULocale displayLocale)

Returns this locale's script localized for display in the provided locale.

Parameters
displayLocale the locale in which to display the name.
Returns
  • the localized script name.

public static String getDisplayVariant (String localeID, String displayLocaleID)

[icu] Returns a locale's variant localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose variant will be displayed
displayLocaleID the id of the locale in which to display the name.
Returns
  • the localized variant name.

public String getDisplayVariant ()

Returns this locale's variant localized for display in the default DISPLAY locale.

Returns
  • the localized variant name.
See Also

public String getDisplayVariant (ULocale displayLocale)

Returns this locale's variant localized for display in the provided locale.

Parameters
displayLocale the locale in which to display the name.
Returns
  • the localized variant name.

public static String getDisplayVariant (String localeID, ULocale displayLocale)

[icu] Returns a locale's variant localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters
localeID the id of the locale whose variant will be displayed.
displayLocale the locale in which to display the name.
Returns
  • the localized variant name.

public String getExtension (char key)

Returns the extension (or private use) value associated with the specified key, or null if there is no extension associated with the key. To be well-formed, the key must be one of [0-9A-Za-z]. Keys are case-insensitive, so for example 'z' and 'Z' represent the same extension.

Parameters
key the extension key
Returns
  • The extension, or null if this locale defines no extension for the specified key.
Throws
IllegalArgumentException if key is not well-formed

public Set<Character> getExtensionKeys ()

Returns the set of extension keys associated with this locale, or the empty set if it has no extensions. The returned set is unmodifiable. The keys will all be lower-case.

Returns
  • the set of extension keys, or the empty set if this locale has no extensions

public ULocale getFallback ()

[icu] Returns the fallback locale for this locale. If this locale is root, returns null.

public static String getFallback (String localeID)

[icu] Returns the fallback locale for the specified locale, which might be the empty string.

Parameters
localeID

public String getISO3Country ()

Returns a three-letter abbreviation for this locale's country/region. If the locale doesn't specify a country, returns the empty string. Otherwise, returns an uppercase ISO 3166 3-letter country code.

Throws
MissingResourceException Throws MissingResourceException if the three-letter country abbreviation is not available for this locale.

public static String getISO3Country (String localeID)

[icu] Returns a three-letter abbreviation for this locale's country/region. If the locale doesn't specify a country, returns the empty string. Otherwise, returns an uppercase ISO 3166 3-letter country code.

Parameters
localeID
Throws
MissingResourceException Throws MissingResourceException if the three-letter country abbreviation is not available for this locale.

public String getISO3Language ()

Returns a three-letter abbreviation for this locale's language. If the locale doesn't specify a language, returns the empty string. Otherwise, returns a lowercase ISO 639-2/T language code. The ISO 639-2 language codes can be found on-line at ftp://dkuug.dk/i18n/iso-639-2.txt

Throws
MissingResourceException Throws MissingResourceException if the three-letter language abbreviation is not available for this locale.

public static String getISO3Language (String localeID)

[icu] Returns a three-letter abbreviation for this locale's language. If the locale doesn't specify a language, returns the empty string. Otherwise, returns a lowercase ISO 639-2/T language code. The ISO 639-2 language codes can be found on-line at ftp://dkuug.dk/i18n/iso-639-2.txt

Parameters
localeID
Throws
MissingResourceException Throws MissingResourceException if the three-letter language abbreviation is not available for this locale.

public static String[] getISOCountries ()

Returns a list of all 2-letter country codes defined in ISO 3166. Can be used to create Locales.

public static String[] getISOLanguages ()

Returns a list of all 2-letter language codes defined in ISO 639. Can be used to create Locales. [NOTE: ISO 639 is not a stable standard-- some languages' codes have changed. The list this function returns includes both the new and the old codes for the languages whose codes have changed.]

public static String getKeywordValue (String localeID, String keywordName)

[icu] Returns the value for a keyword in the specified locale. If the keyword is not defined, returns null. The locale name does not need to be normalized.

Parameters
localeID
keywordName name of the keyword whose value is desired. Case insensitive.
Returns
  • String the value of the keyword as a string

public String getKeywordValue (String keywordName)

[icu] Returns the value for a keyword in this locale. If the keyword is not defined, returns null.

Parameters
keywordName name of the keyword whose value is desired. Case insensitive.
Returns
  • the value of the keyword, or null.

public static Iterator<String> getKeywords (String localeID)

[icu] Returns an iterator over keywords for the specified locale. If there are no keywords, returns null.

Parameters
localeID
Returns
  • an iterator over the keywords in the specified locale, or null if there are no keywords.

public Iterator<String> getKeywords ()

[icu] Returns an iterator over keywords for this locale. If there are no keywords, returns null.

Returns
  • iterator over keywords, or null if there are no keywords.

public static String getLanguage (String localeID)

Returns the language code for the locale ID, which will either be the empty string or a lowercase ISO 639 code.

Parameters
localeID

public String getLanguage ()

Returns the language code for this locale, which will either be the empty string or a lowercase ISO 639 code.

public String getLineOrientation ()

[icu] Returns this locale's layout orientation for lines. The possible values are "left-to-right", "right-to-left", "top-to-bottom" or "bottom-to-top".

Returns
  • The locale's layout orientation for lines.

public String getName ()

[icu] Returns the (normalized) full name for this locale.

Returns
  • String the full name of the localeID

public static String getName (String localeID)

[icu] Returns the (normalized) full name for the specified locale.

Parameters
localeID the localeID as a string
Returns
  • String the full name of the localeID

public String getScript ()

Returns the script code for this locale, which might be the empty string.

public static String getScript (String localeID)

[icu] Returns the script code for the specified locale, which might be the empty string.

Parameters
localeID

public Set<String> getUnicodeLocaleAttributes ()

Returns the set of unicode locale attributes associated with this locale, or the empty set if it has no attributes. The returned set is unmodifiable.

Returns
  • The set of attributes.

public Set<String> getUnicodeLocaleKeys ()

Returns the set of Unicode locale keys defined by this locale, or the empty set if this locale has none. The returned set is immutable. Keys are all lower case.

Returns
  • The set of Unicode locale keys, or the empty set if this locale has no Unicode locale keywords.

public String getUnicodeLocaleType (String key)

Returns the Unicode locale type associated with the specified Unicode locale key for this locale. Returns the empty string for keys that are defined with no type. Returns null if the key is not defined. Keys are case-insensitive. The key must be two alphanumeric characters ([0-9a-zA-Z]), or an IllegalArgumentException is thrown.

Parameters
key the Unicode locale key
Returns
  • The Unicode locale type associated with the key, or null if the locale does not define the key.
Throws
IllegalArgumentException if the key is not well-formed
NullPointerException if key is null

public String getVariant ()

Returns the variant code for this locale, which might be the empty string.

public static String getVariant (String localeID)

[icu] Returns the variant code for the specified locale, which might be the empty string.

Parameters
localeID

public int hashCode ()

Returns the hashCode.

Returns
  • this object's hash code.

public boolean isRightToLeft ()

[icu] Returns whether this locale's script is written right-to-left. If there is no script subtag, then the likely script is used, see addLikelySubtags(ULocale). If no likely script is known, then false is returned.

A script is right-to-left according to the CLDR script metadata which corresponds to whether the script's letters have Bidi_Class=R or AL.

Returns true for "ar" and "en-Hebr", false for "zh" and "fa-Cyrl".

Returns
  • true if the locale's script is written right-to-left

public static ULocale minimizeSubtags (ULocale loc)

[icu] Minimizes the subtags for a provided locale ID, per the algorithm described in the following CLDR technical report:

http://www.unicode.org/reports/tr35/#Likely_Subtags
If the provided ULocale instance is already in the minimal form, or there is no data available for minimization, it will be returned. Since the minimization algorithm relies on proper maximization, see the comments for addLikelySubtags for reasons why there might not be any data. Examples:

 "en_Latn_US" minimizes to "en"

 "de_Latn_US" minimizes to "de"

 "sr_Cyrl_RS" minimizes to "sr"

 "zh_Hant_TW" minimizes to "zh_TW" (The region is preferred to the
 script, and minimizing to "zh" would imply "zh_Hans_CN".) 

Parameters
loc The ULocale to minimize
Returns
  • The minimized ULocale instance.

public ULocale setKeywordValue (String keyword, String value)

[icu] Given a keyword and a value, return a new locale with an updated keyword and value. If the keyword is null, this removes all keywords from the locale id. Otherwise, if the value is null, this removes the value for this keyword from the locale id. Otherwise, this adds/replaces the value for this keyword in the locale id. The keyword and value must not be empty.

Related: getBaseName() returns the locale ID string with all keywords removed.

Parameters
keyword the keyword to add/remove, or null to remove all keywords.
value the value to add/set, or null to remove this particular keyword.
Returns
  • the updated locale

public static String setKeywordValue (String localeID, String keyword, String value)

Given a locale id, a keyword, and a value, return a new locale id with an updated keyword and value. If the keyword is null, this removes all keywords from the locale id. Otherwise, if the value is null, this removes the value for this keyword from the locale id. Otherwise, this adds/replaces the value for this keyword in the locale id. The keyword and value must not be empty.

Related: getBaseName(String) returns the locale ID string with all keywords removed.

Parameters
localeID the locale id to modify
keyword the keyword to add/remove, or null to remove all keywords.
value the value to add/set, or null to remove this particular keyword.
Returns
  • the updated locale id

public String toLanguageTag ()

Returns a well-formed IETF BCP 47 language tag representing this locale.

If this ULocale has a language, script, country, or variant that does not satisfy the IETF BCP 47 language tag syntax requirements, this method handles these fields as described below:

Language: If language is empty, or not well-formed (for example "a" or "e2"), it will be emitted as "und" (Undetermined).

Script: If script is not well-formed (for example "12" or "Latin"), it will be omitted.

Country: If country is not well-formed (for example "12" or "USA"), it will be omitted.

Variant: If variant is well-formed, each sub-segment (delimited by '-' or '_') is emitted as a subtag. Otherwise:

  • if all sub-segments match [0-9a-zA-Z]{1,8} (for example "WIN" or "Oracle_JDK_Standard_Edition"), the first ill-formed sub-segment and all following will be appended to the private use subtag. The first appended subtag will be "lvariant", followed by the sub-segments in order, separated by hyphen. For example, "x-lvariant-WIN", "Oracle-x-lvariant-JDK-Standard-Edition".
  • if any sub-segment does not match [0-9a-zA-Z]{1,8}, the variant will be truncated and the problematic sub-segment and all following sub-segments will be omitted. If the remainder is non-empty, it will be emitted as a private use subtag as above (even if the remainder turns out to be well-formed). For example, "Solaris_isjustthecoolestthing" is emitted as "x-lvariant-Solaris", not as "solaris".

Note: Although the language tag created by this method is well-formed (satisfies the syntax requirements defined by the IETF BCP 47 specification), it is not necessarily a valid BCP 47 language tag. For example,

   new Locale("xx", "YY").toLanguageTag();
will return "xx-YY", but the language subtag "xx" and the region subtag "YY" are invalid because they are not registered in the IANA Language Subtag Registry.

Returns
  • a BCP47 language tag representing the locale

public static String toLegacyKey (String keyword)

[icu] Converts the specified keyword (BCP 47 Unicode locale extension key, or legacy key) to the legacy key. For example, legacy key "collation" is returned for the input BCP 47 Unicode locale extension key "co".

Parameters
keyword the input locale keyword (either BCP 47 Unicode locale extension key or legacy key).
Returns
  • the well-formed legacy key, or null if the specified keyword cannot be mapped to a well-formed legacy key.

public static String toLegacyType (String keyword, String value)

[icu] Converts the specified keyword value (BCP 47 Unicode locale extension type, or legacy type or type alias) to the canonical legacy type. For example, the legacy type "phonebook" is returned for the input BCP 47 Unicode locale extension type "phonebk" with the keyword "collation" (or "co").

When the specified keyword is not recognized, but the specified value satisfies the syntax of legacy key, or when the specified keyword allows 'variable' type and the specified value satisfies the syntax, the lower-case version of the input value will be returned. For example, toLegacyType("Foo", "Bar") returns "bar", toLegacyType("vt", "00A4") returns "00a4".

Parameters
keyword the locale keyword (either legacy keyword such as "collation" or BCP 47 Unicode locale extension key such as "co").
value the locale keyword value (either BCP 47 Unicode locale extension type such as "phonebk" or legacy keyword value such as "phonebook").
Returns
  • the well-formed legacy type, or null if the specified keyword value cannot be mapped to a well-formed legacy type.

public Locale toLocale ()

[icu] Converts this ULocale object to a Locale.

Returns
  • a Locale that either exactly represents this object or is the closest approximation.

public String toString ()

Returns a string representation of this object.

Returns
  • a printable representation of this object.

public static String toUnicodeLocaleKey (String keyword)

[icu] Converts the specified keyword (legacy key, or BCP 47 Unicode locale extension key) to the equivalent BCP 47 Unicode locale extension key. For example, BCP 47 Unicode locale extension key "co" is returned for the input keyword "collation".

When the specified keyword is unknown, but satisfies the BCP syntax, then the lower-case version of the input keyword will be returned. For example, toUnicodeLocaleKey("ZZ") returns "zz".

Parameters
keyword the input locale keyword (either legacy key such as "collation" or BCP 47 Unicode locale extension key such as "co").
Returns
  • the well-formed BCP 47 Unicode locale extension key, or null if the specified locale keyword cannot be mapped to a well-formed BCP 47 Unicode locale extension key.

public static String toUnicodeLocaleType (String keyword, String value)

[icu] Converts the specified keyword value (legacy type, or BCP 47 Unicode locale extension type) to the well-formed BCP 47 Unicode locale extension type for the specified keyword (category). For example, BCP 47 Unicode locale extension type "phonebk" is returned for the input keyword value "phonebook", with the keyword "collation" (or "co").

When the specified keyword is not recognized, but the specified value satisfies the syntax of the BCP 47 Unicode locale extension type, or when the specified keyword allows 'variable' type and the specified value satisfies the syntax, the lower-case version of the input value will be returned. For example, toUnicodeLocaleType("Foo", "Bar") returns "bar", toUnicodeLocaleType("variableTop", "00A4") returns "00a4".

Parameters
keyword the locale keyword (either legacy key such as "collation" or BCP 47 Unicode locale extension key such as "co").
value the locale keyword value (either legacy type such as "phonebook" or BCP 47 Unicode locale extension type such as "phonebk").
Returns
  • the well-formed BCP47 Unicode locale extension type, or null if the locale keyword value cannot be mapped to a well-formed BCP 47 Unicode locale extension type.