/// <summary>
/// Browse all variables in the objects folder.
/// </summary>
private IList <INode> BrowseAllVariables()
{
var result = new List <INode>();
var nodesToBrowse = new ExpandedNodeIdCollection();
nodesToBrowse.Add(ObjectIds.ObjectsFolder);
while (nodesToBrowse.Count > 0)
{
var nextNodesToBrowse = new ExpandedNodeIdCollection();
foreach (var node in nodesToBrowse)
{
try
{
var organizers = _session.NodeCache.FindReferences(
node,
ReferenceTypeIds.Organizes,
false,
false);
var components = _session.NodeCache.FindReferences(
node,
ReferenceTypeIds.HasComponent,
false,
false);
var properties = _session.NodeCache.FindReferences(
node,
ReferenceTypeIds.HasProperty,
false,
false);
nextNodesToBrowse.AddRange(organizers
.Where(n => n is ObjectNode)
.Select(n => n.NodeId).ToList());
nextNodesToBrowse.AddRange(components
.Where(n => n is ObjectNode)
.Select(n => n.NodeId).ToList());
result.AddRange(organizers.Where(n => n is VariableNode));
result.AddRange(components.Where(n => n is VariableNode));
result.AddRange(properties.Where(n => n is VariableNode));
}
catch (ServiceResultException sre)
{
if (sre.StatusCode == StatusCodes.BadUserAccessDenied)
{
Console.WriteLine($"Access denied: Skip node {node}.");
}
}
}
nodesToBrowse = nextNodesToBrowse;
}
return(result);
}
/// <summary>
/// Load all subTypes and optionally nested subtypes of a type definition.
/// Filter for all subtypes or only subtypesoutside the default namespace.
/// </summary>
private IList <INode> LoadDataTypes(
ExpandedNodeId dataType,
bool nestedSubTypes = false,
bool addRootNode = false,
bool filterUATypes = true)
{
var result = new List <INode>();
var nodesToBrowse = new ExpandedNodeIdCollection();
nodesToBrowse.Add(dataType);
if (addRootNode)
{
var rootNode = m_session.NodeCache.Find(dataType);
if (!(rootNode is DataTypeNode))
{
throw new ServiceResultException("Root Node is not a DataType node.");
}
result.Add(rootNode);
}
while (nodesToBrowse.Count > 0)
{
var nextNodesToBrowse = new ExpandedNodeIdCollection();
foreach (var node in nodesToBrowse)
{
var response = m_session.NodeCache.FindReferences(
node,
ReferenceTypeIds.HasSubtype,
false,
false);
if (nestedSubTypes)
{
nextNodesToBrowse.AddRange(response.Select(r => r.NodeId).ToList());
}
if (filterUATypes)
{
// filter out default namespace
result.AddRange(response.Where(rd => rd.NodeId.NamespaceIndex != 0));
}
else
{
result.AddRange(response);
}
}
nodesToBrowse = nextNodesToBrowse;
}
return(result);
}
/// <summary>
/// Reads an ExpandedNodeId array from the stream.
/// </summary>
public ExpandedNodeIdCollection ReadExpandedNodeIdArray(string fieldName)
{
bool isNil = false;
ExpandedNodeIdCollection values = new ExpandedNodeIdCollection();
if (BeginField(fieldName, true, out isNil))
{
PushNamespace(Namespaces.OpcUaXsd);
while (MoveToElement("ExpandedNodeId"))
{
values.Add(ReadExpandedNodeId("ExpandedNodeId"));
}
// check the length.
if (m_context.MaxArrayLength > 0 && m_context.MaxArrayLength < values.Count)
{
throw new ServiceResultException(StatusCodes.BadEncodingLimitsExceeded);
}
PopNamespace();
EndField(fieldName);
return values;
}
if (isNil)
{
return null;
}
return values;
}
/// <summary>
/// Reads an ExpandedNodeId array from the stream.
/// </summary>
public ExpandedNodeIdCollection ReadExpandedNodeIdArray(string fieldName)
{
int length = ReadArrayLength();
if (length == -1)
{
return null;
}
ExpandedNodeIdCollection values = new ExpandedNodeIdCollection(length);
for (int ii = 0; ii < length; ii++)
{
values.Add(ReadExpandedNodeId(null));
}
return values;
}
/// <summary>
/// Reads an ExpandedNodeId array from the stream.
/// </summary>
public ExpandedNodeIdCollection ReadExpandedNodeIdArray(string fieldName)
{
var values = new ExpandedNodeIdCollection();
List<object> token = null;
if (!ReadArrayField(fieldName, out token))
{
return values;
}
for (int ii = 0; ii < token.Count; ii++)
{
try
{
m_stack.Push(token[ii]);
var element = ReadExpandedNodeId(null);
values.Add(element);
}
finally
{
m_stack.Pop();
}
}
return values;
}
/// <summary>
/// Finds a set of nodes in the nodeset,
/// fetches missing nodes from server.
/// </summary>
/// <param name="nodeIds">The node identifier collection.</param>
public IList <INode> Find(IList <ExpandedNodeId> nodeIds)
{
// check for null.
if (nodeIds == null || nodeIds.Count == 0)
{
return(new List <INode>());
}
int count = nodeIds.Count;
IList <INode> nodes = new List <INode>(count);
var fetchNodeIds = new ExpandedNodeIdCollection();
int ii;
for (ii = 0; ii < count; ii++)
{
// check if node already exists.
INode node = m_nodes.Find(nodeIds[ii]);
// do not return temporary nodes created after a Browse().
if (node != null &&
node?.GetType() != typeof(Node))
{
nodes.Add(node);
}
else
{
nodes.Add(null);
fetchNodeIds.Add(nodeIds[ii]);
}
}
if (fetchNodeIds.Count == 0)
{
return(nodes);
}
// fetch missing nodes from server.
IList <Node> fetchedNodes;
try
{
fetchedNodes = FetchNodes(fetchNodeIds);
}
catch (Exception e)
{
Utils.LogError("Could not fetch nodes from server: Reason='{1}'.", e.Message);
// m_nodes[nodeId] = null;
return(nodes);
}
ii = 0;
foreach (Node fetchedNode in fetchedNodes)
{
while (ii < count && nodes[ii] != null)
{
ii++;
}
if (ii < count && nodes[ii] == null)
{
nodes[ii++] = fetchedNode;
}
else
{
Utils.LogError("Inconsistency fetching nodes from server. Not all nodes could be assigned.");
break;
}
}
return(nodes);
}
