void Namespace::connect(const scene::INodePtr& root)
{
// Now traverse the subgraph and connect the nodes
ConnectNamespacedWalker firstWalker(this);
root->traverse(firstWalker);
ConnectNameObserverWalker secondWalker;
root->traverse(secondWalker);
}
void Namespace::disconnect(const scene::INodePtr& root)
{
// First, disconnect all NameObservers
DisconnectNameObserverWalker firstWalker;
root->traverse(firstWalker);
// Second, remove all "names" from the namespace and clear the reference
DisconnectNamespacedWalker secondWalker;
root->traverse(secondWalker);
}
void Namespace::ensureNoConflicts(const scene::INodePtr& root)
{
// Instantiate a new, temporary namespace for the nodes below root
Namespace foreignNamespace;
// Move all nodes below (and including) root into this temporary namespace
foreignNamespace.connect(root);
// Collect all namespaced items from the foreign root
GatherNamespacedWalker walker;
root->traverse(walker);
rDebug() << "Namespace::ensureNoConflicts(): imported set of "
<< walker.result.size() << " namespaced nodes" << std::endl;
// Build a union set containing all imported names and all existing names.
// We need to know all existing names to ensure that newly created names are
// unique in *both* namespaces
UniqueNameSet allNames = _uniqueNames;
allNames.merge(foreignNamespace._uniqueNames);
// Process each object in the to-be-imported tree of nodes, ensuring that it
// has a unique name
for (const NamespacedPtr& n : walker.result)
{
// If the imported node conflicts with a name in THIS namespace, then it
// needs to be given a new name which is unique in BOTH namespaces.
if (_uniqueNames.nameExists(n->getName()))
{
// Name exists in the target namespace, get a new name
std::string uniqueName = allNames.insertUnique(n->getName());
rMessage() << "Namespace::ensureNoConflicts(): '" << n->getName()
<< "' already exists in this namespace. Rename it to '"
<< uniqueName << "'\n";
// Change the name of the imported node, this should trigger all
// observers in the foreign namespace
n->changeName(uniqueName);
}
else
{
// Name does not exist yet, insert it into the local combined
// namespace (but not our destination namespace, this will be
// populated in the subsequent call to connect()).
allNames.insert(n->getName());
}
}
// at this point, all names in the foreign namespace have been converted to
// something unique in this namespace. The calling code can now move the
// nodes into this namespace without name conflicts
// Disconnect the root from the foreign namespace again, it will be destroyed now
foreignNamespace.disconnect(root);
}