public <A, T extends VoidVisitor<A>> void addVoidListener(
Filter2<Object, T, A> filter, In3<T, Node, A> listener) {
final VoidFactory was = voidFactory;
voidFactory =
(vis, arg) -> {
if (filter.filter(vis, arg)) {
return (In3) listener;
}
return was.io(vis, arg);
};
}
public <A, Vis extends VoidVisitor<A>> In3<Vis, Node, A> voidVisit(Vis vis, A arg) {
final In3 factory = voidFactory.io(vis, arg);
return (v, n, a) -> {
try (Do undo = universalListener.io(n, a)) {
factory.in(v, n, a);
}
};
}