de.thksystems.util.text.LocaleUtils Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of cumin Show documentation
Commons for lang, crypto, xml, dom, text, csv, reflection, annotations, parsing, ...
There is a newer version: 4.3.3
/*
 * tksCommons
 *
 * Author : Thomas Kuhlmann (ThK-Systems, http://www.thk-systems.de) License : LGPL (https://www.gnu.org/licenses/lgpl.html)
 */
package de.thksystems.util.text;

import java.util.Arrays;
import java.util.Collection;
import java.util.Currency;
import java.util.Locale;
import java.util.logging.Logger;
import java.util.stream.Collectors;

import org.apache.commons.lang3.ClassUtils;

import com.ibm.icu.util.ULocale;

import de.thksystems.util.lang.Deferred;

/**
 * Accesses locales from JDK or ICU (preferred).
 */
public final class LocaleUtils {

    private static final Logger LOG = Logger.getLogger(LocaleUtils.class.getName());

    private static final Deferred localeDelegate = new Deferred<>(LocaleDelegate::getImplementation);

    private static final Deferred> countryCodes = new Deferred<>(() -> localeDelegate.get().getCountryCodes());

    private static final Deferred> currencyCodes = new Deferred<>(() -> localeDelegate.get().getCurrencyCodes());

    private static final Deferred> localeCodes = new Deferred<>(() -> localeDelegate.get().getLocaleCodes());

    private LocaleUtils() {
    }

    public static boolean isValidCountryCode(String countryCode) {
        return countryCodes.get().contains(countryCode);
    }

    public static boolean isValidCurrencyCode(String currencyCode) {
        return currencyCodes.get().contains(currencyCode);
    }

    public static boolean isValidLocaleCode(String localeCode) {
        return localeCodes.get().contains(localeCode);
    }

    interface LocaleDelegate {

        static LocaleDelegate getImplementation() {
            try {
                ClassUtils.getClass("com.ibm.icu.util.ULocale");
                ClassUtils.getClass("com.ibm.icu.util.Currency");
                LOG.info("Using ICU implementation");
                return new ICUDelegate();
            } catch (ClassNotFoundException e) {
                LOG.info("Using JDK implementation");
                return new JDKDelegate();
            }
        }

        Collection getCountryCodes();

        Collection getCurrencyCodes();

        Collection getLocaleCodes();

    }

    static class JDKDelegate implements LocaleDelegate {

        @Override
        public Collection getCountryCodes() {
            return Arrays.asList(Locale.getISOCountries());
        }

        @Override
        public Collection getCurrencyCodes() {
            return java.util.Currency.getAvailableCurrencies().stream().map(Currency::getCurrencyCode).collect(Collectors.toSet());
        }

        @Override
        public Collection getLocaleCodes() {
            return Arrays.stream(Locale.getAvailableLocales()).map(Locale::toString).collect(Collectors.toSet());
        }

    }

    static class ICUDelegate implements LocaleDelegate {

        @Override
        public Collection getCountryCodes() {
            return Arrays.asList(ULocale.getISOCountries());
        }

        @Override
        public Collection getCurrencyCodes() {
            return com.ibm.icu.util.Currency.getAvailableCurrencies().stream().map(com.ibm.icu.util.Currency::getCurrencyCode).collect(Collectors.toSet());
        }

        @Override
        public Collection getLocaleCodes() {
            return Arrays.stream(ULocale.getAvailableLocales()).map(ULocale::getName).collect(Collectors.toSet());
        }

    }

}