question: if the given action is null , returns #noop , otherwise returns the given action . concode_field_sep PlaceHolder placeHolder concode_field_sep Action<Object> noop concode_elem_sep T with concode_elem_sep O with concode_elem_sep Action<T> ignoreArg concode_elem_sep T uncheckedWith concode_elem_sep O uncheckedWith concode_elem_sep Consumer<T> toConsumer concode_elem_sep Action<O> prepend concode_elem_sep Action<T> from concode_elem_sep Action<T> join concode_elem_sep void execute concode_elem_sep Action<Throwable> throwException concode_elem_sep Action<T> throwException concode_elem_sep Block curry concode_elem_sep Action<O> append
target: Action < ? super T > function ( @ Nullable Action < T > arg0 ) { if ( arg0 == null ) { return noop ( ) ; } else { return arg0 ; } }