/// <summary>
/// Updates the list of area filters.
/// </summary>
private void UpdateAreaFilter(List <NodeId> areas)
{
// check if monitoring all events.
if (areas == null || areas.Count == 0)
{
MonitoredItem monitoredItem = null;
if (!m_notifiers.TryGetValue(Opc.Ua.ObjectIds.Server, out monitoredItem))
{
monitoredItem = CreateMonitoredItem(Opc.Ua.ObjectIds.Server);
}
m_notifiers.Clear();
m_notifiers[Opc.Ua.ObjectIds.Server] = monitoredItem;
return;
}
// build table of areas to monitor.
NodeIdDictionary <MonitoredItem> notifiers = new NodeIdDictionary <MonitoredItem>();
// map all of the area search strings onto NodeIds for notifiers.
for (int ii = 0; ii < areas.Count; ii++)
{
NodeId areaId = areas[ii];
// check for existing item.
MonitoredItem monitoredItem = null;
if (m_notifiers.TryGetValue(areaId, out monitoredItem))
{
notifiers[areaId] = monitoredItem;
continue;
}
// check for new item.
if (!notifiers.ContainsKey(areaId))
{
notifiers[areaId] = CreateMonitoredItem(areaId);
}
}
// mark unused items for deletion.
foreach (MonitoredItem monitoredItem in m_notifiers.Values)
{
if (!notifiers.ContainsKey(monitoredItem.StartNodeId))
{
m_subscription.RemoveItem(monitoredItem);
}
}
m_notifiers = notifiers;
}
/// <summary>
/// Checks the isInverse flag are returns true if a specified target exists.
/// </summary>
/// <param name="entry">The entry.</param>
/// <param name="reference">The reference.</param>
/// <returns>
/// <c>true</c> if the specified entry contains key; otherwise, <c>false</c>.
/// </returns>
private static bool ContainsKey(ReferenceTypeEntry entry, IReference reference)
{
// handle reference to external targets.
if (reference.TargetId.IsAbsolute)
{
Dictionary <ExpandedNodeId, LinkedListNode <KeyValuePair <IReference, T> > > targets = null;
if (reference.IsInverse)
{
targets = entry.InverseExternalTargets;
}
else
{
targets = entry.ForwardExternalTargets;
}
if (targets == null)
{
return(false);
}
return(targets.ContainsKey(reference.TargetId));
}
// handle reference to internal target.
else
{
NodeIdDictionary <LinkedListNode <KeyValuePair <IReference, T> > > targets = null;
if (reference.IsInverse)
{
targets = entry.InverseTargets;
}
else
{
targets = entry.ForwardTargets;
}
if (targets == null)
{
return(false);
}
return(targets.ContainsKey((NodeId)reference.TargetId));
}
}
/// <summary>
/// Updates the list of area filters.
/// </summary>
private void UpdateAreaFilter(List<NodeId> areas)
{
// check if monitoring all events.
if (areas == null || areas.Count == 0)
{
MonitoredItem monitoredItem = null;
if (!m_notifiers.TryGetValue(Opc.Ua.ObjectIds.Server, out monitoredItem))
{
monitoredItem = CreateMonitoredItem(Opc.Ua.ObjectIds.Server);
}
m_notifiers.Clear();
m_notifiers[Opc.Ua.ObjectIds.Server] = monitoredItem;
return;
}
// build table of areas to monitor.
NodeIdDictionary<MonitoredItem> notifiers = new NodeIdDictionary<MonitoredItem>();
// map all of the area search strings onto NodeIds for notifiers.
for (int ii = 0; ii < areas.Count; ii++)
{
NodeId areaId = areas[ii];
// check for existing item.
MonitoredItem monitoredItem = null;
if (m_notifiers.TryGetValue(areaId, out monitoredItem))
{
notifiers[areaId] = monitoredItem;
continue;
}
// check for new item.
if (!notifiers.ContainsKey(areaId))
{
notifiers[areaId] = CreateMonitoredItem(areaId);
}
}
// mark unused items for deletion.
foreach (MonitoredItem monitoredItem in m_notifiers.Values)
{
if (!notifiers.ContainsKey(monitoredItem.StartNodeId))
{
m_subscription.RemoveItem(monitoredItem);
}
}
m_notifiers = notifiers;
}