/** An edge to be added to the tree must not belong to any tree (including this one). */
void
Tree::add (Tree::Edge* e)
throw (Tree::DuplicateEdge, Tree::EdgeInUse, Tree::EmptyEdge, Tree::SecondParent, Tree::EmptyEndPoint)
{
if (e == 0)
throw EmptyEdge();
if (edge_set.find(e) != edge_set.end())
throw DuplicateEdge(e);
if (e->in_use)
throw EdgeInUse(e);
if ((e->child_node == 0) || (e->parent_node == 0))
throw EmptyEndPoint(e);
if (e->child_node->incoming != 0)
throw SecondParent(e);
// insert the nodes if they don't already exist in the graph
if (node_set.find(e->parent_node) == node_set.end())
add(e->parent_node);
if (node_set.find(e->child_node) == node_set.end())
add(e->child_node);
// insert the edge in the corresponding lists of the two nodes
e->parent_node->outgoing.push_back(e);
e->child_node->incoming = e;
// finally, insert the edge itself in the tree
e->in_use = true;
edge_set.insert(e);
preorder_needed = postorder_needed = rpostorder_needed = true;
}
/*! An edge to be added to the tree must not belong to any tree
(including this one). */
void
Tree::addEdge(OA_ptr<Tree::Edge> e)
throw (Tree::DuplicateEdge, Tree::EdgeInUse, Tree::EmptyEdge, Tree::SecondParent, Tree::EmptyEndPoint)
{
if (e.ptrEqual(0)) {
throw EmptyEdge();
}
if (edge_set->find(e) != edge_set->end()) {
throw DuplicateEdge(e);
}
if (e->in_use) {
throw EdgeInUse(e);
}
if ((e->child_node.ptrEqual(0)) || (e->parent_node.ptrEqual(0))) {
throw EmptyEndPoint(e);
}
if (!e->child_node->incoming.ptrEqual(0)) {
throw SecondParent(e);
}
// insert the nodes if they don't already exist in the graph
if (node_set->find(e->parent_node) == node_set->end()) {
addNode(e->parent_node);
}
if (node_set->find(e->child_node) == node_set->end()) {
addNode(e->child_node);
}
// insert the edge in the corresponding lists of the two nodes
e->parent_node->outgoing->push_back(e);
e->child_node->incoming = e;
// finally, insert the edge itself in the tree
e->in_use = true;
edge_set->insert(e);
preorder_needed = postorder_needed = rpostorder_needed = true;
}