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/**
 * Copyright (C) 2011 Ovea 
 *
 * 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 com.ovea.tadjin.util;

import java.util.Locale;

public final class LocaleUtil {

    private LocaleUtil() {
    }

    public static Locale valueOf(String localeString) {
        return valueOf(localeString, null);
    }

    /**
     * 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 valueOf(String localeString, Locale defaultLocale) {
        if (localeString == null) {
            return defaultLocale;
        }
        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);
        }
    }
}