// Copyright (c) 2003-2012, Jodd Team (jodd.org). All Rights Reserved.
package jodd.util;
import java.util.Locale;
import java.util.HashMap;
import java.util.Map;
import java.text.NumberFormat;
/**
* Locale utilities.
*/
public class LocaleUtil {
/**
* Holds all per-Locale data.
*/
static class LocaleData {
LocaleData(Locale locale) {
this.locale = locale;
}
final Locale locale;
DateFormatSymbolsEx dateFormatSymbols;
NumberFormat numberFormat;
}
// ---------------------------------------------------------------- locale cache
protected static Map<String, LocaleData> locales = new HashMap<String, LocaleData>();
/**
* Lookups for locale data and creates new if it doesn't exist.
*/
protected static LocaleData lookupLocaleData(String code) {
LocaleData localeData = locales.get(code);
if (localeData == null) {
String[] data = decodeLocaleCode(code);
localeData = new LocaleData(new Locale(data[0], data[1], data[2]));
locales.put(code, localeData);
}
return localeData;
}
protected static LocaleData lookupLocaleData(Locale locale) {
return lookupLocaleData(resolveLocaleCode(locale));
}
// ---------------------------------------------------------------- get cached locales
/**
* Returns Locale from cache.
*/
public static Locale getLocale(String language, String country, String variant) {
LocaleData localeData = lookupLocaleData(resolveLocaleCode(language, country, variant));
return localeData.locale;
}
/**
* Returns Locale from cache.
*/
public static Locale getLocale(String language, String country) {
return getLocale(language, country, null);
}
/**
* Returns Locale from cache where Locale may be specified also using language code.
* Converts a locale string like "en", "en_US" or "en_US_win" to <b>new</b> Java locale object.
*/
public static Locale getLocale(String languageCode) {
LocaleData localeData = lookupLocaleData(languageCode);
return localeData.locale;
}
// ---------------------------------------------------------------- convert
/**
* Transforms locale data to locale code. <code>null</code> values are allowed.
*/
public static String resolveLocaleCode(String lang, String country, String variant) {
StringBuilder code = new StringBuilder(lang);
if (StringUtil.isEmpty(country) == false) {
code.append('_').append(country);
if (StringUtil.isEmpty(variant) == false) {
code.append('_').append(variant);
}
}
return code.toString();
}
/**
* Resolves locale code from locale.
*/
public static String resolveLocaleCode(Locale locale) {
return resolveLocaleCode(locale.getLanguage(), locale.getCountry(), locale.getVariant());
}
/**
* Decodes locale code in string array that can be used for <code>Locale</code> constructor.
*/
public static String[] decodeLocaleCode(String localeCode) {
String result[] = new String[3];
String[] data = StringUtil.splitc(localeCode, '_');
result[0] = data[0];
result[1] = result[2] = StringPool.EMPTY;
if (data.length >= 2) {
result[1] = data[1];
if (data.length >= 3) {
result[2] = data[2];
}
}
return result;
}
// ---------------------------------------------------------------- locale elements
/**
* Returns <code>DateFormatSymbols</code> instance for specified locale.
*/
public static DateFormatSymbolsEx getDateFormatSymbols(Locale locale) {
LocaleData localeData = lookupLocaleData(locale);
DateFormatSymbolsEx dfs = localeData.dateFormatSymbols;
if (dfs == null) {
dfs = new DateFormatSymbolsEx(locale);
localeData.dateFormatSymbols = dfs;
}
return dfs;
}
/**
* Returns <code>NumberFormat</code> instance for specified locale.
*/
public static NumberFormat getNumberFormat(Locale locale) {
LocaleData localeData = lookupLocaleData(locale);
NumberFormat nf = localeData.numberFormat;
if (nf == null) {
nf = NumberFormat.getInstance(locale);
localeData.numberFormat = nf;
}
return nf;
}
}
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