code: public static boolean isSpecialLocale (@Nullable final Locale aLocale)
    {
      return LOCALE_ALL.equals (aLocale) || LOCALE_INDEPENDENT.equals (aLocale);
    }
docs: Check if the passed locale is one of the special locales "all" or
  "independent"
  
  @param aLocale
  The locale to check. May be <code>null</code>.
  @return if the passed locale is not <code>null</code> and a special locale.
  @see #LOCALE_ALL
  @see #LOCALE_INDEPENDENT