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jetbrick.util.LocaleUtils Maven / Gradle / Ivy
/**
* Copyright 2013-2016 Guoqiang Chen, Shanghai, China. All rights reserved.
*
* Author: Guoqiang Chen
* Email: [email protected]
* WebURL: https://github.com/subchen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrick.util;
import java.text.DateFormatSymbols;
import java.text.NumberFormat;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
public final class LocaleUtils {
private static Map locales = new HashMap();
/**
* Returns Locale from cache.
*/
public static Locale getLocale(final String language, final String country, final String variant) {
LocaleInfo info = lookupLocaleInfo(resolveLocaleCode(language, country, variant));
return info.locale;
}
/**
* Returns Locale from cache.
*/
public static Locale getLocale(final String language, final 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 new Java locale object.
*/
public static Locale getLocale(final String languageCode) {
LocaleInfo info = lookupLocaleInfo(languageCode);
return info.locale;
}
/**
* Transforms locale data to locale code. null
values are allowed.
*/
public static String resolveLocaleCode(final String lang, final String country, final String variant) {
StringBuilder code = new StringBuilder(lang);
if (country != null && country.length() > 0) {
code.append('_').append(country);
if (variant != null && variant.length() > 0) {
code.append('_').append(variant);
}
}
return code.toString();
}
/**
* Resolves locale code from locale.
*/
public static String resolveLocaleCode(final Locale locale) {
return resolveLocaleCode(locale.getLanguage(), locale.getCountry(), locale.getVariant());
}
/**
* Decodes locale code in string array that can be used for Locale
constructor.
*/
public static String[] decodeLocaleCode(final String localeCode) {
String[] data = StringUtils.split(localeCode, '_');
String[] result = new String[] { data[0], "", "" };
if (data.length >= 2) {
result[1] = data[1];
if (data.length >= 3) {
result[2] = data[2];
}
}
return result;
}
/**
* Returns cached DateFormatSymbols
instance for specified locale.
*/
public static DateFormatSymbols getDateFormatSymbols(Locale locale) {
LocaleInfo info = lookupLocaleInfo(locale);
DateFormatSymbols dfs = info.dateFormatSymbols;
if (dfs == null) {
dfs = new DateFormatSymbols(locale);
info.dateFormatSymbols = dfs;
}
return dfs;
}
/**
* Returns cached NumberFormat
instance for specified locale.
*/
public static NumberFormat getNumberFormat(Locale locale) {
LocaleInfo info = lookupLocaleInfo(locale);
NumberFormat nf = info.numberFormat;
if (nf == null) {
nf = NumberFormat.getInstance(locale);
info.numberFormat = nf;
}
return nf;
}
/**
* Lookups for locale info and creates new if it doesn't exist.
*/
protected static LocaleInfo lookupLocaleInfo(final String code) {
LocaleInfo info = locales.get(code);
if (info == null) {
String[] data = decodeLocaleCode(code);
info = new LocaleInfo(new Locale(data[0], data[1], data[2]));
locales.put(code, info);
}
return info;
}
protected static LocaleInfo lookupLocaleInfo(final Locale locale) {
return lookupLocaleInfo(resolveLocaleCode(locale));
}
/**
* Holds all per-Locale data.
*/
private static class LocaleInfo {
final Locale locale;
DateFormatSymbols dateFormatSymbols;
NumberFormat numberFormat;
LocaleInfo(Locale locale) {
this.locale = locale;
}
}
}
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