}

    @Override
    public DependentNodesSet addFinalizer(Node finalizer) {
        finalizers.add(finalizer);
        return this;
    }

    @Override
    public Set<Node> getMustPredecessors() {
        return mustPredecessors;
    }

    @Override
    public DependentNodesSet addMustPredecessor(Node fromNode) {
        mustPredecessors.add(fromNode);
        return this;
    }

    default SortedSet<Node> getFinalizers() {
        return ImmutableSortedSet.of();
    }

    DependentNodesSet addFinalizer(Node finalizer);

    default Set<Node> getMustPredecessors() {
        return Collections.emptySet();
    }

    DependentNodesSet addMustPredecessor(Node fromNode);

    /**
     * Visits all nodes in this set.