|
public static Browse ( |
||
| session | The session. | |
| nodeToBrowse | BrowseDescription | The NodeId for the starting node. |
| throwOnError | bool | if set to |
| return | ReferenceDescriptionCollection | |
/// <summary>
/// Fetches the children from the server.
/// </summary>
private List <AeBrowseElement> Browse(Session session, AeBrowseElement start, bool isArea)
{
// browse for notifiers and sources.
BrowseDescription nodeToBrowse = new BrowseDescription();
nodeToBrowse.NodeId = start.NodeId;
nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
nodeToBrowse.ResultMask = (uint)(BrowseResultMask.BrowseName);
nodeToBrowse.NodeClassMask = (uint)0;
if (isArea)
{
nodeToBrowse.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasNotifier;
nodeToBrowse.IncludeSubtypes = true;
}
else
{
nodeToBrowse.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasEventSource;
nodeToBrowse.IncludeSubtypes = true;
}
ReferenceDescriptionCollection references = ComAeUtils.Browse(
session,
nodeToBrowse,
false);
if (references == null)
{
throw ComUtils.CreateComException(ResultIds.E_FAIL);
}
List <AeBrowseElement> hits = new List <AeBrowseElement>();
for (int ii = 0; ii < references.Count; ii++)
{
// ignore remote references.
if (references[ii].NodeId.IsAbsolute)
{
continue;
}
// need to check if at the end of the tree.
if (references[ii].ReferenceTypeId != ReferenceTypeIds.HasEventSource)
{
nodeToBrowse.NodeId = (NodeId)references[ii].NodeId;
ReferenceDescriptionCollection children = ComAeUtils.Browse(session, nodeToBrowse, false);
if (!isArea)
{
if (children != null && children.Count > 0)
{
continue;
}
}
else
{
if (children == null || children.Count == 0)
{
continue;
}
}
}
string browseText = m_mapper.GetLocalBrowseName(references[ii].BrowseName);
// check for duplicate browse names.
for (int jj = 0; jj < hits.Count; jj++)
{
if (hits[jj].BrowseText == browseText)
{
hits[jj].Duplicated = true;
browseText = null;
break;
}
}
// add new element.
if (browseText != null)
{
AeBrowseElement element = new AeBrowseElement();
element.Parent = start;
element.NodeId = (NodeId)references[ii].NodeId;
element.BrowseText = m_mapper.GetLocalBrowseName(references[ii].BrowseName);
element.IsArea = isArea;
hits.Add(element);
StringBuilder itemId = new StringBuilder();
itemId.Append(start.ItemId);
itemId.Append('/');
itemId.Append(element.BrowseText);
element.ItemId = itemId.ToString();
}
}
// remove any duplicates.
for (int ii = 0; ii < hits.Count;)
{
if (hits[ii].Duplicated)
{
hits.RemoveAt(ii);
continue;
}
ii++;
}
return(hits);
}
/// <summary>
/// Finds an element identified by the path from the root.
/// </summary>
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);
}
/// <summary>
/// Recursively populates the event types table.
/// </summary>
private void IndexTypesFromServer(NodeId baseTypeId, int eventType)
{
// check if event type needs to be revised.
if (baseTypeId == Opc.Ua.ObjectTypeIds.ConditionType)
{
eventType = OpcRcw.Ae.Constants.CONDITION_EVENT;
}
else if (baseTypeId == Opc.Ua.ObjectTypeIds.AuditEventType)
{
eventType = OpcRcw.Ae.Constants.TRACKING_EVENT;
}
else if (baseTypeId == Opc.Ua.ObjectTypeIds.BaseEventType)
{
eventType = OpcRcw.Ae.Constants.SIMPLE_EVENT;
}
// browse for subtypes.
BrowseDescription nodeToBrowse = new BrowseDescription();
nodeToBrowse.NodeId = baseTypeId;
nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
nodeToBrowse.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasSubtype;
nodeToBrowse.IncludeSubtypes = false;
nodeToBrowse.NodeClassMask = (uint)NodeClass.ObjectType;
nodeToBrowse.ResultMask = (uint)(BrowseResultMask.BrowseName | BrowseResultMask.DisplayName | BrowseResultMask.NodeClass);
ReferenceDescriptionCollection references = ComAeUtils.Browse(
m_session,
nodeToBrowse,
false);
for (int ii = 0; ii < references.Count; ii++)
{
// these types have t
if (references[ii].NodeId.IsAbsolute)
{
continue;
}
NodeId typeId = (NodeId)references[ii].NodeId;
if (!m_eventTypes.ContainsKey(typeId))
{
// collection the instances declared by the type.
List <AeEventAttribute> declarations = new List <AeEventAttribute>();
Dictionary <string, AeEventAttribute> map = new Dictionary <string, AeEventAttribute>();
ComAeUtils.CollectInstanceDeclarations(
m_session,
this,
(NodeId)references[ii].NodeId,
null,
declarations,
map);
AeEventCategory declaration = new AeEventCategory();
declaration.TypeId = (NodeId)references[ii].NodeId;
declaration.SuperTypeId = baseTypeId;
declaration.EventType = eventType;
declaration.Description = (LocalizedText.IsNullOrEmpty(references[ii].DisplayName)) ? references[ii].BrowseName.Name : references[ii].DisplayName.Text;
declaration.Attributes = declarations;
m_eventTypes[declaration.TypeId] = declaration;
}
// recursively look for subtypes.
IndexTypesFromServer(typeId, eventType);
}
}