create an immutable set from the supplied items . concode_field_sep PlaceHolder placeHolder concode_field_sep Set<T> emptySet
Set < T > function ( Collection < T > arg0 ) { if ( arg0 == null || arg0 . isEmpty ( ) ) return emptySet ( ) ; return java . util . Collections . unmodifiableSet ( new LinkedHashSet < > ( arg0 ) ) ; }