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Utility classes.
There is a newer version: 8.4.5
package org.molgenis.util.i18n;

import static org.molgenis.util.i18n.MessageSourceHolder.getMessageSource;
import static org.springframework.context.i18n.LocaleContextHolder.getLocale;

import java.util.Locale;
import java.util.Optional;
import java.util.stream.Stream;
import org.springframework.context.NoSuchMessageException;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.context.support.MessageSourceResourceBundle;

public class LanguageService {
  private LanguageService() {}

  public static final String LANGUAGE_CODE_EN = "en";
  private static final String LANGUAGE_CODE_DE = "de";
  public static final String LANGUAGE_CODE_NL = "nl";
  private static final String LANGUAGE_CODE_ES = "es";
  private static final String LANGUAGE_CODE_IT = "it";
  private static final String LANGUAGE_CODE_PT = "pt";
  private static final String LANGUAGE_CODE_FR = "fr";
  private static final String LANGUAGE_CODE_XX = "xx";
  public static final Locale DEFAULT_LOCALE = Locale.ENGLISH;
  public static final String DEFAULT_LANGUAGE_CODE = LANGUAGE_CODE_EN;
  public static final String DEFAULT_LANGUAGE_NAME = "English";

  /**
   * "en": is default "xx": is a placeholder for having your own language "nl", "de", "es", "it",
   * "pt", "fr": are extra languages
   */
  public static Stream getLanguageCodes() {
    return Stream.of(
        LANGUAGE_CODE_EN,
        LANGUAGE_CODE_NL,
        LANGUAGE_CODE_DE,
        LANGUAGE_CODE_ES,
        LANGUAGE_CODE_IT,
        LANGUAGE_CODE_PT,
        LANGUAGE_CODE_FR,
        LANGUAGE_CODE_XX);
  }

  public static boolean hasLanguageCode(String code) {
    return getLanguageCodes().anyMatch(languageCode -> languageCode.equals(code));
  }

  /**
   * Creates a localization ResourceBundle for current locale.
   *
   * @return MessageSourceResourceBundle
   */
  @Deprecated
  public static MessageSourceResourceBundle getBundle() {
    return new MessageSourceResourceBundle(getMessageSource(), getLocale());
  }

  /**
   * @return the current user's language code
   * @deprecated Use the {@link LocaleContextHolder} instead.
   */
  @Deprecated
  public static String getCurrentUserLanguageCode() {
    return getLocale().getLanguage();
  }

  /** @deprecated Use {@link MessageSourceHolder} and {@link LocaleContextHolder} instead */
  @Deprecated
  public static Optional formatMessage(String code, Object[] arguments) {
    try {
      return Optional.of(getMessageSource().getMessage(code, arguments, getLocale()));
    } catch (NoSuchMessageException ex) {
      return Optional.empty();
    }
  }
}