return region.getPreferred().newSubtag();
case PRIMARY:
Language language = getEnum();
return language.getPreferred().newSubtag();
case SCRIPT:
Script script = getEnum();
return script.getPreferred().newSubtag();
case VARIANT:
Variant variant = getEnum();
return variant.getPreferred().newSubtag();
case EXTLANG:
Extlang extlang = getEnum();