Opc.Ua.Com.Server.ComAe2Browser.Find C# (CSharp) Method

        private AeBrowseElement Find(Session session, string itemId, AeBrowseElement root, Stack<string> names, bool isArea)
        {
            string browseText = null;

            BrowsePath browsePath = new BrowsePath();
            browsePath.StartingNode = root.NodeId;

            while (names.Count > 0)
            {
                RelativePathElement path = new RelativePathElement();

                path.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasNotifier;
                path.IsInverse = false;
                path.IncludeSubtypes = true;

                // final hop can be HasEventSource for sources.
                if (!isArea && names.Count == 1)
                {
                    path.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasEventSource;
                }

                browseText = names.Pop();
                path.TargetName = m_mapper.GetRemoteBrowseName(browseText);
                browsePath.RelativePath.Elements.Add(path);
            }

            BrowsePathCollection browsePaths = new BrowsePathCollection();
            browsePaths.Add(browsePath);

            // make the call to the server.
            BrowsePathResultCollection results;
            DiagnosticInfoCollection diagnosticInfos;

            ResponseHeader responseHeader = session.TranslateBrowsePathsToNodeIds(
                null,
                browsePaths,
                out results,
                out diagnosticInfos);

            // ensure that the server returned valid results.
            Session.ValidateResponse(results, browsePaths);
            Session.ValidateDiagnosticInfos(diagnosticInfos, browsePaths);

            // check if the start node actually exists.
            if (StatusCode.IsBad(results[0].StatusCode))
            {
                return null;
            }

            // must be exact one target.
            if (results[0].Targets.Count != 1)
            {
                return null;
            }

            // can't be an external reference.
            BrowsePathTarget target = results[0].Targets[0];

            if (target.RemainingPathIndex != UInt32.MaxValue)
            {
                return null;
            }

            // need to check if at the end of the tree.
            BrowseDescription nodeToBrowse = new BrowseDescription();
            nodeToBrowse.NodeId = (NodeId)target.TargetId;
            nodeToBrowse.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasEventSource;
            nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
            nodeToBrowse.IncludeSubtypes = true;

            ReferenceDescriptionCollection children = ComAeUtils.Browse(session, nodeToBrowse, false);

            if (!isArea)
            {
                if (children != null && children.Count > 0)
                {
                    return null;
                }
            }
            else
            {
                if (children == null || children.Count == 0)
                {
                    return null;
                }
            }

            // construct the element.
            AeBrowseElement element = new AeBrowseElement();
            element.NodeId = (NodeId)target.TargetId;
            element.ItemId = itemId;
            element.BrowseText = browseText;
            element.IsArea = isArea;

            return element;
        }
        #endregion