/// <summary>
/// Collects the fields for the type.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="eventTypeId">The type id.</param>
/// <param name="fields">The fields.</param>
/// <param name="fieldNodeIds">The node id for the declaration of the field.</param>
public static void CollectFieldsForType(Session session, NodeId typeId, SimpleAttributeOperandCollection fields, List <NodeId> fieldNodeIds)
{
// get the supertypes.
ReferenceDescriptionCollection supertypes = FormUtils.BrowseSuperTypes(session, typeId, false);
if (supertypes == null)
{
return;
}
// process the types starting from the top of the tree.
Dictionary <NodeId, QualifiedNameCollection> foundNodes = new Dictionary <NodeId, QualifiedNameCollection>();
QualifiedNameCollection parentPath = new QualifiedNameCollection();
for (int ii = supertypes.Count - 1; ii >= 0; ii--)
{
CollectFields(session, (NodeId)supertypes[ii].NodeId, parentPath, fields, fieldNodeIds, foundNodes);
}
// collect the fields for the selected type.
CollectFields(session, typeId, parentPath, fields, fieldNodeIds, foundNodes);
}
/// <summary>
/// Constructs an event object from a notification.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="monitoredItem">The monitored item that produced the notification.</param>
/// <param name="notification">The notification.</param>
/// <param name="knownEventTypes">The known event types.</param>
/// <param name="eventTypeMappings">Mapping between event types and known event types.</param>
/// <returns>
/// The event object. Null if the notification is not a valid event type.
/// </returns>
public static BaseEventState ConstructEvent(
Session session,
MonitoredItem monitoredItem,
EventFieldList notification,
Dictionary <NodeId, Type> knownEventTypes,
Dictionary <NodeId, NodeId> eventTypeMappings)
{
// find the event type.
NodeId eventTypeId = FindEventType(monitoredItem, notification);
if (eventTypeId == null)
{
return(null);
}
// look up the known event type.
Type knownType = null;
NodeId knownTypeId = null;
if (eventTypeMappings.TryGetValue(eventTypeId, out knownTypeId))
{
knownType = knownEventTypes[knownTypeId];
}
// try again.
if (knownType == null)
{
if (knownEventTypes.TryGetValue(eventTypeId, out knownType))
{
knownTypeId = eventTypeId;
eventTypeMappings.Add(eventTypeId, eventTypeId);
}
}
// try mapping it to a known type.
if (knownType == null)
{
// browse for the supertypes of the event type.
ReferenceDescriptionCollection supertypes = FormUtils.BrowseSuperTypes(session, eventTypeId, false);
// can't do anything with unknown types.
if (supertypes == null)
{
return(null);
}
// find the first supertype that matches a known event type.
for (int ii = 0; ii < supertypes.Count; ii++)
{
NodeId superTypeId = (NodeId)supertypes[ii].NodeId;
if (knownEventTypes.TryGetValue(superTypeId, out knownType))
{
knownTypeId = superTypeId;
eventTypeMappings.Add(eventTypeId, superTypeId);
}
if (knownTypeId != null)
{
break;
}
}
// can't do anything with unknown types.
if (knownTypeId == null)
{
return(null);
}
}
// construct the event based on the known event type.
BaseEventState e = (BaseEventState)Activator.CreateInstance(knownType, new object[] { (NodeState)null });
// get the filter which defines the contents of the notification.
EventFilter filter = monitoredItem.Status.Filter as EventFilter;
// initialize the event with the values in the notification.
e.Update(session.SystemContext, filter.SelectClauses, notification);
// save the orginal notification.
e.Handle = notification;
return(e);
}