code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2013 Daniel Naber (http://www.danielnaber.de)
   * 
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool;
  
  import java.util.*;
  
  import static org.languagetool.JLanguageTool.MESSAGE_BUNDLE;
  
  /**
   * Message bundle helper class used for translation of the user interface.
   * @since 2.3
   */
  public final class ResourceBundleTools {
  
    private ResourceBundleTools() {
    }
  
    /**
     * Gets the ResourceBundle (i18n strings) for the default language of the user's system.
     */
    public static ResourceBundle getMessageBundle() {
      try {
        ResourceBundle bundle = JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, Locale.getDefault());
        ResourceBundle fallbackBundle = JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, Locale.ENGLISH);
        return new ResourceBundleWithFallback(bundle, fallbackBundle);
      } catch (MissingResourceException e) {
        return JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, Locale.ENGLISH);
      }
    }
  
    /**
     * Gets the ResourceBundle (i18n strings) for the given user interface language.
     */
    public static ResourceBundle getMessageBundle(Language lang) {
      try {
        ResourceBundle bundle = JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, lang.getLocaleWithCountryAndVariant());
        if (!isValidBundleFor(lang, bundle)) {
          bundle = JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, lang.getLocale());
          if (!isValidBundleFor(lang, bundle)) {
            // happens if 'xx' is requested but only a MessagesBundle_xx_YY.properties exists:
            Language defaultVariant = lang.getDefaultLanguageVariant();
            if (defaultVariant != null && defaultVariant.getCountries().length > 0) {
              Locale locale = new Locale(defaultVariant.getShortCode(), defaultVariant.getCountries()[0]);
              bundle = JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, locale);
            }
          }
        }
        ResourceBundle fallbackBundle = JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, Locale.ENGLISH);
        return new ResourceBundleWithFallback(bundle, fallbackBundle);
      } catch (MissingResourceException e) {
        return JLanguageTool.getDataBroker().getResourceBundle(MESSAGE_BUNDLE, Locale.ENGLISH);
      }
    }
  
    private static boolean isValidBundleFor(Language lang, ResourceBundle bundle) {
      return lang.getLocale().getLanguage().equals(bundle.getLocale().getLanguage());
    }
  }
  