/**
* Transitively visit a nested set.
*
* @param nestedSet the nested set to visit transitively.
*/
@SuppressWarnings("unchecked")
public void visit(NestedSet<E> nestedSet) {
// This method suppresses the unchecked warning so that it can access the internal NestedSet
// raw structure.
Preconditions.checkArgument(nestedSet.getOrder() == Order.STABLE_ORDER);
if (!visited.add(nestedSet)) {
return;
}
for (NestedSet<E> subset : nestedSet.transitiveSets()) {
visit(subset);
}
for (Object member : nestedSet.directMembers()) {
if (visited.add((E) member)) {
callback.accept((E) member);
}
}
}
private boolean add(NestedSet<E> set) {
return !set.isEmpty() && seenSets.add(set);
}