/// <summary>
/// Returns the next AE area or source.
/// </summary>
/// <returns>A DA element. Null if nothing left to browse.</returns>
public BaseInstanceState Next(ISystemContext context, ushort namespaceIndex)
{
// check if already completed.
if (m_completed)
{
return(null);
}
// create the browser.
if (base.Unknown == null)
{
base.Unknown = m_client.CreateBrowser();
if (base.Unknown == null)
{
return(null);
}
if (!String.IsNullOrEmpty(m_itemId))
{
if (!ChangeBrowsePosition(OPCHDA_BROWSEDIRECTION.OPCHDA_BROWSE_DIRECT, m_itemId))
{
return(null);
}
}
}
// create the enumerator if not already created.
if (m_enumerator == null)
{
m_enumerator = CreateEnumerator(true);
m_branches = true;
// a null indicates an error.
if (m_enumerator == null)
{
m_completed = true;
return(null);
}
}
// need a loop in case errors occur fetching element metadata.
BaseInstanceState node = null;
do
{
// fetch the next name.
string name = m_enumerator.Next();
// a null indicates the end of list.
if (name == null)
{
if (m_branches)
{
m_enumerator.Dispose();
m_enumerator = CreateEnumerator(false);
m_branches = false;
// a null indicates an error.
if (m_enumerator != null)
{
continue;
}
}
m_completed = true;
return(null);
}
// create the node.
if (m_branches)
{
string itemId = GetBranchPosition(m_itemId, name);
node = new HdaBranchState(itemId, name, namespaceIndex);
}
else
{
string itemId = GetItemId(name);
node = new HdaItemState(itemId, name, namespaceIndex);
}
break;
}while (node == null);
// return node.
return(node);
}
/// <summary>
/// Does any initialization required before the address space can be used.
/// </summary>
/// <remarks>
/// The externalReferences is an out parameter that allows the node manager to link to nodes
/// in other node managers. For example, the 'Objects' node is managed by the CoreNodeManager and
/// should have a reference to the root folder node(s) exposed by this node manager.
/// </remarks>
public override void CreateAddressSpace(IDictionary<NodeId, IList<IReference>> externalReferences)
{
lock (Lock)
{
// check if the type model needs to be loaded.
if (NamespaceIndexes.Length > 1)
{
LoadPredefinedNodes(SystemContext, externalReferences);
}
// create the root node.
string serverName = m_configuration.ServerName;
if (String.IsNullOrEmpty(serverName))
{
serverName = "ComHdaServer";
}
HdaBranchState root = new HdaBranchState(String.Empty, serverName, NamespaceIndex);
root.AddReference(ReferenceTypeIds.Organizes, true, ObjectIds.ObjectsFolder);
// link root to objects folder.
IList<IReference> references = null;
if (!externalReferences.TryGetValue(ObjectIds.ObjectsFolder, out references))
{
externalReferences[ObjectIds.ObjectsFolder] = references = new List<IReference>();
}
references.Add(new NodeStateReference(ReferenceTypeIds.Organizes, false, root.NodeId));
// create the status node.
ComServerStatusState status = new ComServerStatusState(root);
status.ReferenceTypeId = ReferenceTypeIds.Organizes;
// get the type namepace for the browse name.
int typeNamepaceIndex = Server.NamespaceUris.GetIndex(Namespaces.ComInterop);
if (typeNamepaceIndex < 0)
{
typeNamepaceIndex = NamespaceIndex;
}
status.Create(
SystemContext,
HdaModelUtils.ConstructIdForInternalNode("ServerStatus", NamespaceIndex),
new QualifiedName("ServerStatus", (ushort)typeNamepaceIndex),
null,
true);
root.AddChild(status);
// store root folder in the pre-defined nodes.
AddPredefinedNode(SystemContext, root);
// create the server capabilities object.
HistoryServerCapabilitiesState capabilities = m_capabilities = new HistoryServerCapabilitiesState(null);
CreateNode(
SystemContext,
root.NodeId,
ReferenceTypeIds.Organizes,
new QualifiedName(Opc.Ua.BrowseNames.HistoryServerCapabilities),
capabilities);
capabilities.AccessHistoryDataCapability.Value = true;
capabilities.AccessHistoryEventsCapability.Value = false;
capabilities.MaxReturnDataValues.Value = 0;
capabilities.MaxReturnEventValues.Value = 0;
capabilities.ReplaceDataCapability.Value = false;
capabilities.UpdateDataCapability.Value = false;
capabilities.InsertEventCapability.Value = false;
capabilities.ReplaceEventCapability.Value = false;
capabilities.UpdateEventCapability.Value = false;
capabilities.InsertAnnotationCapability.Value = false;
capabilities.InsertDataCapability.Value = false;
capabilities.DeleteRawCapability.Value = false;
capabilities.DeleteAtTimeCapability.Value = false;
AddPredefinedNode(SystemContext, capabilities);
// create the default aggregate configuration object.
AggregateConfigurationState aggregateConfiguration = new AggregateConfigurationState(null);
aggregateConfiguration.ReferenceTypeId = ReferenceTypeIds.Organizes;
aggregateConfiguration.Create(
SystemContext,
HdaModelUtils.ConstructIdForInternalNode(Opc.Ua.BrowseNames.AggregateConfiguration, NamespaceIndex),
Opc.Ua.BrowseNames.AggregateConfiguration,
null,
true);
aggregateConfiguration.TreatUncertainAsBad.Value = m_configuration.TreatUncertainAsBad;
aggregateConfiguration.PercentDataBad.Value = m_configuration.PercentDataBad;
aggregateConfiguration.PercentDataGood.Value = m_configuration.PercentDataGood;
aggregateConfiguration.UseSlopedExtrapolation.Value = m_configuration.SteppedSlopedExtrapolation;
AddPredefinedNode(SystemContext, aggregateConfiguration);
// create the COM server.
m_system.Initialize(SystemContext, m_configuration, status, Lock, OnServerReconnected);
StartMetadataUpdates(DoMetadataUpdate, null, 5000, m_configuration.MaxReconnectWait);
}
}
/// <summary>
/// Returns the next AE area or source.
/// </summary>
/// <returns>A DA element. Null if nothing left to browse.</returns>
public BaseInstanceState Next(ISystemContext context, ushort namespaceIndex)
{
// check if already completed.
if (m_completed)
{
return null;
}
// create the browser.
if (base.Unknown == null)
{
base.Unknown = m_client.CreateBrowser();
if (base.Unknown == null)
{
return null;
}
if (!String.IsNullOrEmpty(m_itemId))
{
if (!ChangeBrowsePosition(OPCHDA_BROWSEDIRECTION.OPCHDA_BROWSE_DIRECT, m_itemId))
{
return null;
}
}
}
// create the enumerator if not already created.
if (m_enumerator == null)
{
m_enumerator = CreateEnumerator(true);
m_branches = true;
// a null indicates an error.
if (m_enumerator == null)
{
m_completed = true;
return null;
}
}
// need a loop in case errors occur fetching element metadata.
BaseInstanceState node = null;
do
{
// fetch the next name.
string name = m_enumerator.Next();
// a null indicates the end of list.
if (name == null)
{
if (m_branches)
{
m_enumerator.Dispose();
m_enumerator = CreateEnumerator(false);
m_branches = false;
// a null indicates an error.
if (m_enumerator != null)
{
continue;
}
}
m_completed = true;
return null;
}
// create the node.
if (m_branches)
{
string itemId = GetBranchPosition(m_itemId, name);
node = new HdaBranchState(itemId, name, namespaceIndex);
}
else
{
string itemId = GetItemId(name);
node = new HdaItemState(itemId, name, namespaceIndex);
}
break;
}
while (node == null);
// return node.
return node;
}
