/// <summary>
/// Collects instance declarations nodes from with a type.
/// </summary>
public static void CollectInstanceDeclarations(
Session session,
ComNamespaceMapper mapper,
NodeState node,
AeEventAttribute parent,
List <AeEventAttribute> instances,
IDictionary <string, AeEventAttribute> map)
{
List <BaseInstanceState> children = new List <BaseInstanceState>();
node.GetChildren(session.SystemContext, children);
if (children.Count == 0)
{
return;
}
// process the children.
for (int ii = 0; ii < children.Count; ii++)
{
BaseInstanceState instance = children[ii];
// only interested in objects and variables.
if (instance.NodeClass != NodeClass.Object && instance.NodeClass != NodeClass.Variable)
{
return;
}
// ignore instances without a modelling rule.
if (NodeId.IsNull(instance.ModellingRuleId))
{
return;
}
// create a new declaration.
AeEventAttribute declaration = new AeEventAttribute();
declaration.RootTypeId = (parent != null)?parent.RootTypeId:node.NodeId;
declaration.NodeId = (NodeId)instance.NodeId;
declaration.BrowseName = instance.BrowseName;
declaration.NodeClass = instance.NodeClass;
declaration.Description = (instance.Description != null)?instance.Description.ToString():null;
// get data type information.
BaseVariableState variable = instance as BaseVariableState;
if (variable != null)
{
declaration.DataType = variable.DataType;
declaration.ValueRank = variable.ValueRank;
if (!NodeId.IsNull(variable.DataType))
{
declaration.BuiltInType = DataTypes.GetBuiltInType(declaration.DataType, session.TypeTree);
}
}
if (!LocalizedText.IsNullOrEmpty(instance.DisplayName))
{
declaration.DisplayName = instance.DisplayName.Text;
}
else
{
declaration.DisplayName = instance.BrowseName.Name;
}
if (parent != null)
{
declaration.BrowsePath = new QualifiedNameCollection(parent.BrowsePath);
declaration.BrowsePathDisplayText = Utils.Format("{0}/{1}", parent.BrowsePathDisplayText, mapper.GetLocalBrowseName(instance.BrowseName));
declaration.DisplayPath = Utils.Format("{0}/{1}", parent.DisplayPath, instance.DisplayName);
}
else
{
declaration.BrowsePath = new QualifiedNameCollection();
declaration.BrowsePathDisplayText = Utils.Format("{0}", instance.BrowseName);
declaration.DisplayPath = Utils.Format("{0}", instance.DisplayName);
}
declaration.BrowsePath.Add(instance.BrowseName);
// check if reading an overridden declaration.
AeEventAttribute overriden = null;
if (map.TryGetValue(declaration.BrowsePathDisplayText, out overriden))
{
declaration.OverriddenDeclaration = overriden;
}
map[declaration.BrowsePathDisplayText] = declaration;
// only interested in variables.
if (instance.NodeClass == NodeClass.Variable)
{
instances.Add(declaration);
}
// recusively build tree.
CollectInstanceDeclarations(session, mapper, instance, declaration, instances, map);
}
}
/// <summary>
/// Finds the targets for the specified reference.
/// </summary>
private static void UpdateInstanceDescriptions(Session session, List <InstanceDeclaration> instances, bool throwOnError)
{
try
{
ReadValueIdCollection nodesToRead = new ReadValueIdCollection();
for (int ii = 0; ii < instances.Count; ii++)
{
ReadValueId nodeToRead = new ReadValueId();
nodeToRead.NodeId = instances[ii].NodeId;
nodeToRead.AttributeId = Attributes.Description;
nodesToRead.Add(nodeToRead);
nodeToRead = new ReadValueId();
nodeToRead.NodeId = instances[ii].NodeId;
nodeToRead.AttributeId = Attributes.DataType;
nodesToRead.Add(nodeToRead);
nodeToRead = new ReadValueId();
nodeToRead.NodeId = instances[ii].NodeId;
nodeToRead.AttributeId = Attributes.ValueRank;
nodesToRead.Add(nodeToRead);
}
// start the browse operation.
DataValueCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
session.Read(
null,
0,
TimestampsToReturn.Neither,
nodesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
// update the instances.
for (int ii = 0; ii < nodesToRead.Count; ii += 3)
{
InstanceDeclaration instance = instances[ii / 3];
instance.Description = results[ii].GetValue <LocalizedText>(LocalizedText.Null).Text;
instance.DataType = results[ii + 1].GetValue <NodeId>(NodeId.Null);
instance.ValueRank = results[ii + 2].GetValue <int>(ValueRanks.Any);
if (!NodeId.IsNull(instance.DataType))
{
instance.BuiltInType = DataTypes.GetBuiltInType(instance.DataType);
instance.DataTypeDisplayText = session.NodeCache.GetDisplayText(instance.DataType);
if (instance.ValueRank >= 0)
{
instance.DataTypeDisplayText += "[]";
}
}
}
}
catch (Exception exception)
{
if (throwOnError)
{
throw new ServiceResultException(exception, StatusCodes.BadUnexpectedError);
}
}
}
/// <summary>
/// Validates the items by reading the attributes required to add them to the group.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="group">The group.</param>
/// <param name="requests">The requests.</param>
/// <param name="items">The items.</param>
/// <param name="start">The start index.</param>
/// <param name="count">The number of items to process.</param>
private void ValidateItems(
Session session,
ComDaGroup group,
ComDaCreateItemRequest[] requests,
ComDaGroupItem[] items,
int start,
int count)
{
// build list of the UA attributes that need to be read.
ReadValueIdCollection attributesToRead = new ReadValueIdCollection();
for (int ii = start; ii < start + count && ii < requests.Length; ii++)
{
// create the group item.
ComDaCreateItemRequest request = requests[ii];
ComDaGroupItem item = items[ii] = new ComDaGroupItem(group, request.ItemId);
item.NodeId = m_mapper.GetRemoteNodeId(request.ItemId);
item.Active = request.Active;
item.ClientHandle = request.ClientHandle;
item.RequestedDataType = request.RequestedDataType;
item.SamplingRate = -1;
item.Deadband = -1;
// add attributes.
ReadValueId attributeToRead;
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.NodeClass;
attributesToRead.Add(attributeToRead);
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.DataType;
attributesToRead.Add(attributeToRead);
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.ValueRank;
attributesToRead.Add(attributeToRead);
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.UserAccessLevel;
attributesToRead.Add(attributeToRead);
}
// read attribute values from the server.
DataValueCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
try
{
session.Read(
null,
0,
TimestampsToReturn.Neither,
attributesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, attributesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, attributesToRead);
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error reading attributes for items.");
// set default values on error.
for (int ii = start; ii < start + count && ii < requests.Length; ii++)
{
requests[ii].Error = ResultIds.E_INVALIDITEMID;
}
return;
}
// process results.
int first = 0;
for (int ii = start; ii < start + count && ii < requests.Length; ii++, first += 4)
{
ComDaGroupItem item = items[ii];
// verify node class.
NodeClass nodeClass = (NodeClass)results[first].GetValue <int>((int)NodeClass.Unspecified);
if (nodeClass != NodeClass.Variable)
{
requests[ii].Error = ResultIds.E_INVALIDITEMID;
continue;
}
// verify data type.
NodeId dataTypeId = results[first + 1].GetValue <NodeId>(null);
if (dataTypeId == null)
{
requests[ii].Error = ResultIds.E_INVALIDITEMID;
continue;
}
// get value rank.
int valueRank = results[first + 2].GetValue <int>(ValueRanks.Scalar);
// update datatypes.
BuiltInType builtInType = DataTypes.GetBuiltInType(dataTypeId, session.TypeTree);
item.RemoteDataType = new TypeInfo(builtInType, valueRank);
item.CanonicalDataType = (short)ComUtils.GetVarType(item.RemoteDataType);
// update access rights.
byte userAccessLevel = results[first + 3].GetValue <byte>(0);
if ((userAccessLevel & AccessLevels.CurrentRead) != 0)
{
item.AccessRights |= OpcRcw.Da.Constants.OPC_READABLE;
}
if ((userAccessLevel & AccessLevels.CurrentWrite) != 0)
{
item.AccessRights |= OpcRcw.Da.Constants.OPC_WRITEABLE;
}
}
}
