org.jspringbot.keyword.date.util.I18nUtil Maven / Gradle / Ivy

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package org.jspringbot.keyword.date.util;

import java.util.Locale;

public final class I18nUtil {

    private I18nUtil()
    {
        // protects from instantiation
    }

    /**
     * Convert a string based locale into a Locale Object.
     * Assumes the string has form "{language}_{country}_{variant}".
     * Examples: "en", "de_DE", "_GB", "en_US_WIN", "de__POSIX", "fr_MAC"
     *
     * @param localeString The String
     * @return the Locale
     */
    public static Locale getLocaleFromString(String localeString) {
        if (localeString == null) {
            return null;
        }

        localeString = localeString.trim();
        if (localeString.toLowerCase().equals("default")) {
            return Locale.getDefault();
        }

        // Extract language
        int languageIndex = localeString.indexOf('_');
        String language = null;
        if (languageIndex == -1) {
            // No further "_" so is "{language}" only
            return new Locale(localeString, "");
        } else {
            language = localeString.substring(0, languageIndex);
        }

        // Extract country
        int countryIndex = localeString.indexOf('_', languageIndex + 1);
        String country = null;
        if (countryIndex == -1) {
            // No further "_" so is "{language}_{country}"
            country = localeString.substring(languageIndex+1);
            return new Locale(language, country);
        } else {
            // Assume all remaining is the variant so is "{language}_{country}_{variant}"
            country = localeString.substring(languageIndex+1, countryIndex);
            String variant = localeString.substring(countryIndex+1);
            return new Locale(language, country, variant);
        }
    }
}