Travesing/Querying through the namsepace

[fatihalgan]

Hi,

I was wondering what is the correct way of using the namespace API to locate a node in the namespace. Currently, I am forced to hold a reference to the root level UAFolderNode (or nodes) inside the namespace and use a treeilike recursion based technique similar to the following;

public Tuple2<String, UaFolderNode> getChildFolderFromRoot(String path, UaFolderNode root) {
String[] paths = path.split("/");
Optional maybeChild = getChildFolder(path, root, true);
String[] newPaths = new String[paths.length - 1];
//if path is same as root itself
if(newPaths.length == 0 && path.equals(root.getBrowseName().getName())) {
return new Tuple2<String, UaFolderNode>(path, root);
}
for (int i = 1; i < paths.length; i++) {
newPaths[i - 1] = paths[i];
}
if (newPaths.length > 1) {
String newPath = String.join("/", newPaths);
return getChildFolderFromRoot(newPath, maybeChild.get());
} else {
return new Tuple2<String, UaFolderNode>(newPaths[0], maybeChild.get());
}
}

public Optional<UaFolderNode> getChildFolder(String path, UaFolderNode root, boolean createIfNone) {
	String[] paths = path.split("/");
	if(paths.length < 2) {
		if(paths[0].equals(root.getBrowseName().getName())) return Optional.of(root);
	}
	if(!paths[0].equals(root.getBrowseName().getName())) throw new RuntimeException("Path " + path + " start does not match with root browse name " + root.getBrowseName().getName());
	Optional<UaFolderNode> child = root.findNode(newQualifiedName(paths[1])).map(node -> (UaFolderNode)node);
	if(!child.isPresent() && createIfNone) {
		NodeId childNodeId = newNodeId(root.getNodeId().toParseableString() + "/" + paths[1]);
    	UaFolderNode childNode = new UaFolderNode(getNodeContext(), childNodeId, newQualifiedName(paths[1]), LocalizedText.english(paths[1]));
    	getNodeManager().addNode(childNode);
        root.addOrganizes(childNode);
        child = Optional.of(childNode);
    }
    return child;
}

I wonder if there is a more proper way to search and retrieve a reference to a UaFolderNode (or any other node) instance just via specifying a path, like a query API against the namespace without holding a reference to the root node.

Thanks in advance.

[kevinherron]

No, nothing like that. Perhaps you should be storing NodeIds instead of cobbling together paths; these can be retrieved in constant time from the NodeManager, which is basically just a map. Or store them in some other manner that allows a more efficient lookup.