static private final Cache LOCALECACHE = new Cache();

/** Useful constant for language.

static public final Locale ENGLISH = createConstant("en", "");

/** Useful constant for language.

static public final Locale FRENCH = createConstant("fr", "");

/** Useful constant for language.

static public final Locale GERMAN = createConstant("de", "");

/** Useful constant for language.

static public final Locale ITALIAN = createConstant("it", "");

/** Useful constant for language.

static public final Locale JAPANESE = createConstant("ja", "");

/** Useful constant for language.

static public final Locale KOREAN = createConstant("ko", "");

/** Useful constant for language.

static public final Locale CHINESE = createConstant("zh", "");

/** Useful constant for language.

static public final Locale SIMPLIFIED_CHINESE = createConstant("zh", "CN");

/** Useful constant for language.

static public final Locale TRADITIONAL_CHINESE = createConstant("zh", "TW");

/** Useful constant for country.

static public final Locale FRANCE = createConstant("fr", "FR");

/** Useful constant for country.

static public final Locale GERMANY = createConstant("de", "DE");

/** Useful constant for country.

static public final Locale ITALY = createConstant("it", "IT");

/** Useful constant for country.

static public final Locale JAPAN = createConstant("ja", "JP");

/** Useful constant for country.

static public final Locale KOREA = createConstant("ko", "KR");

/** Useful constant for country.

static public final Locale CHINA = SIMPLIFIED_CHINESE;

/** Useful constant for country.

static public final Locale PRC = SIMPLIFIED_CHINESE;

/** Useful constant for country.

static public final Locale TAIWAN = TRADITIONAL_CHINESE;

/** Useful constant for country.

static public final Locale UK = createConstant("en", "GB");

/** Useful constant for country.

static public final Locale US = createConstant("en", "US");

/** Useful constant for country.

static public final Locale CANADA = createConstant("en", "CA");

/** Useful constant for country.

static public final Locale CANADA_FRENCH = createConstant("fr", "CA");

/**

static public final Locale ROOT = createConstant("", "");

/**

static public final char PRIVATE_USE_EXTENSION = 'x';

/**

static public final char UNICODE_LOCALE_EXTENSION = 'u';

/** serialization ID

static final long serialVersionUID = 9149081749638150636L;

/**

private static final int DISPLAY_LANGUAGE = 0;

private static final int DISPLAY_COUNTRY = 1;

private static final int DISPLAY_VARIANT = 2;

private static final int DISPLAY_SCRIPT = 3;

/**

private Locale(BaseLocale baseLocale, LocaleExtensions extensions) {

this.baseLocale = baseLocale;

this.localeExtensions = extensions;

}

/**

public Locale(String language, String country, String variant) {

if (language== null || country == null || variant == null) {

throw new NullPointerException();

}

baseLocale = BaseLocale.getInstance(convertOldISOCodes(language), "", country, variant);

localeExtensions = getCompatibilityExtensions(language, "", country, variant);

}

/**

public Locale(String language, String country) {

this(language, country, "");

}

/**

public Locale(String language) {

this(language, "", "");

}

/**

private static Locale createConstant(String lang, String country) {

BaseLocale base = BaseLocale.createInstance(lang, country);

return getInstance(base, null);

}

/**

static Locale getInstance(String language, String country, String variant) {

return getInstance(language, "", country, variant, null);

}

static Locale getInstance(String language, String script, String country,

String variant, LocaleExtensions extensions) {

if (language== null || script == null || country == null || variant == null) {

throw new NullPointerException();

}

if (extensions == null) {

extensions = getCompatibilityExtensions(language, script, country, variant);

}

BaseLocale baseloc = BaseLocale.getInstance(language, script, country, variant);

return getInstance(baseloc, extensions);

}

static Locale getInstance(BaseLocale baseloc, LocaleExtensions extensions) {

LocaleKey key = new LocaleKey(baseloc, extensions);

return LOCALECACHE.get(key);

}

private static class Cache extends LocaleObjectCache<LocaleKey, Locale> {

private Cache() {

}

@Override

protected Locale createObject(LocaleKey key) {

return new Locale(key.base, key.exts);

}

}

private static final class LocaleKey {

private final BaseLocale base;

private final LocaleExtensions exts;

private final int hash;

private LocaleKey(BaseLocale baseLocale, LocaleExtensions extensions) {

base = baseLocale;

exts = extensions;

// Calculate the hash value here because it's always used.

int h = base.hashCode();

if (exts != null) {

h ^= exts.hashCode();

}

hash = h;

}

@Override

public boolean equals(Object obj) {

if (this == obj) {

return true;

}

if (!(obj instanceof LocaleKey)) {

return false;

}

LocaleKey other = (LocaleKey)obj;

if (hash != other.hash || !base.equals(other.base)) {

return false;

}

if (exts == null) {

return other.exts == null;

}

return exts.equals(other.exts);

}

@Override

public int hashCode() {

return hash;

}

}

/**

public static Locale getDefault() {

// do not synchronize this method - see 4071298

return defaultLocale;

}

/**

public static Locale getDefault(Locale.Category category) {

// do not synchronize this method - see 4071298

switch (category) {

case DISPLAY:

if (defaultDisplayLocale == null) {

synchronized(Locale.class) {

if (defaultDisplayLocale == null) {

defaultDisplayLocale = initDefault(category);

}

}

}

return defaultDisplayLocale;

case FORMAT:

if (defaultFormatLocale == null) {

synchronized(Locale.class) {

if (defaultFormatLocale == null) {

defaultFormatLocale = initDefault(category);

}

}

}

return defaultFormatLocale;

default:

assert false: "Unknown Category";

}

return getDefault();

}

private static Locale initDefault() {

String language, region, script, country, variant;

language = AccessController.doPrivileged(

new GetPropertyAction("user.language", "en"));

// for compatibility, check for old user.region property

region = AccessController.doPrivileged(

new GetPropertyAction("user.region"));

if (region != null) {

// region can be of form country, country_variant, or _variant

int i = region.indexOf('_');

if (i >= 0) {

country = region.substring(0, i);

variant = region.substring(i + 1);

} else {

country = region;

variant = "";

}

script = "";

} else {

script = AccessController.doPrivileged(

new GetPropertyAction("user.script", ""));

country = AccessController.doPrivileged(

new GetPropertyAction("user.country", ""));

variant = AccessController.doPrivileged(

new GetPropertyAction("user.variant", ""));

}

return getInstance(language, script, country, variant, null);

}

private static Locale initDefault(Locale.Category category) {

return getInstance(

AccessController.doPrivileged(

new GetPropertyAction(category.languageKey, defaultLocale.getLanguage())),

AccessController.doPrivileged(

new GetPropertyAction(category.scriptKey, defaultLocale.getScript())),

AccessController.doPrivileged(

new GetPropertyAction(category.countryKey, defaultLocale.getCountry())),

AccessController.doPrivileged(

new GetPropertyAction(category.variantKey, defaultLocale.getVariant())),

null);

}

/**

public static synchronized void setDefault(Locale newLocale) {

setDefault(Category.DISPLAY, newLocale);

setDefault(Category.FORMAT, newLocale);

defaultLocale = newLocale;

}

/**

public static synchronized void setDefault(Locale.Category category,

Locale newLocale) {

if (category == null)

throw new NullPointerException("Category cannot be NULL");

if (newLocale == null)

throw new NullPointerException("Can't set default locale to NULL");

SecurityManager sm = System.getSecurityManager();

if (sm != null) sm.checkPermission(new PropertyPermission

("user.language", "write"));

switch (category) {

case DISPLAY:

defaultDisplayLocale = newLocale;

break;

case FORMAT:

defaultFormatLocale = newLocale;

break;

default:

assert false: "Unknown Category";

}

}

/**

public static Locale[] getAvailableLocales() {

return LocaleServiceProviderPool.getAllAvailableLocales();

}