/// <summary>
/// Creates and indexes an area defined for the server.
/// </summary>
private AreaState CreateAndIndexAreas(AreaState parent, AreaConfiguration configuration)
{
// create a unique path to the area.
var areaPath = Utils.Format("{0}/{1}", (parent != null) ? parent.SymbolicName : string.Empty, configuration.Name);
var areaId = ModelUtils.ConstructIdForArea(areaPath, NamespaceIndex);
// create the object that will be used to access the area and any variables contained within it.
var area = new AreaState(SystemContext, parent, areaId, configuration);
_areas[areaPath] = area;
if (parent != null)
{
parent.AddChild(area);
}
// create an index any sub-areas defined for the area.
if (configuration.SubAreas != null)
{
for (var ii = 0; ii < configuration.SubAreas.Count; ii++)
{
CreateAndIndexAreas(area, configuration.SubAreas[ii]);
}
}
// add references to sources.
if (configuration.SourcePaths != null)
{
for (var ii = 0; ii < configuration.SourcePaths.Count; ii++)
{
var sourcePath = configuration.SourcePaths[ii];
// check if the source already exists because it is referenced by another area.
if (!_sources.TryGetValue(sourcePath, out var source))
{
var sourceId = ModelUtils.ConstructIdForSource(sourcePath, NamespaceIndex);
_sources[sourcePath] = source = new SourceState(this, sourceId, sourcePath);
}
// HasEventSource and HasNotifier control the propagation of event notifications so
// they are not like other references. These calls set up a link between the source
// and area that will cause events produced by the source to be automatically
// propagated to the area.
source.AddNotifier(SystemContext, ReferenceTypeIds.HasEventSource, true, area);
area.AddNotifier(SystemContext, ReferenceTypeIds.HasEventSource, false, source);
}
}
return(area);
}
/// <summary>
/// Initializes the area.
/// </summary>
public AreaState(
ISystemContext context,
AreaState parent,
NodeId nodeId,
AreaConfiguration configuration)
:
base(parent)
{
Initialize(context);
// initialize the area with the fixed metadata.
SymbolicName = configuration.Name;
NodeId = nodeId;
BrowseName = new QualifiedName(Utils.Format("{0}", configuration.Name), nodeId.NamespaceIndex);
DisplayName = BrowseName.Name;
Description = null;
ReferenceTypeId = ReferenceTypeIds.HasNotifier;
TypeDefinitionId = ObjectTypeIds.FolderType;
EventNotifier = EventNotifiers.SubscribeToEvents;
}