/// <summary>
/// Initializes an shared child based on what is in the address space.
/// </summary>
protected BaseInstanceSource InitializeSharedChild(
BaseInstanceSource sharedChild,
ConstructInstanceDelegate constructInstanceDelegate,
NodeId referenceTypeId,
QualifiedName browseName,
uint numericId,
object configuration)
{
CheckNodeManagerState();
// check if node exists.
ILocalNode existingChild = NodeManager.GetTargetNode(
this.NodeId,
referenceTypeId,
false,
true,
browseName) as ILocalNode;
if (existingChild == null)
{
if (sharedChild != null && sharedChild.Parent != this)
{
ReferenceSharedChild(sharedChild);
}
return null;
}
// check if existing child is owned by the object.
ExpandedNodeId parentId = existingChild.References.FindTarget(ReferenceTypeIds.HasModelParent, false, false, null, 0);
if (parentId != this.NodeId)
{
return sharedChild;
}
// construct the child.
BaseInstanceSource child = constructInstanceDelegate(
Server,
this,
referenceTypeId,
null,
browseName,
numericId);
// create it.
child.Create(this.NodeId, child.ReferenceTypeId, null, null, numericId, configuration);
return child;
}
/// <summary>
/// Replaces a shared child in the address space.
/// </summary>
protected virtual BaseInstanceSource DeleteReplacedChild(BaseInstanceSource child)
{
CheckNodeManagerState();
// save reference and browse name info.
NodeId referenceTypeId = child.ReferenceTypeId;
QualifiedName browseName = child.BrowseName;
// delete from the address space.
child.Delete();
// dispose it.
child.Dispose();
// add reference to shared child.
NodeManager.ReferenceSharedNode(this, referenceTypeId, false, browseName);
// remove reference.
return null;
}
/// <summary>
/// Removes references to a shared child.
/// </summary>
protected virtual BaseInstanceSource UnreferenceSharedChild(BaseInstanceSource child)
{
CheckNodeManagerState();
if (child != null)
{
NodeManager.UnreferenceSharedNode(this, child.ReferenceTypeId, false, child.BrowseName);
}
return null;
}
/// <summary>
/// Replaces a shared child in the address space.
/// </summary>
protected virtual BaseInstanceSource ReplaceSharedChild(
BaseInstanceSource child,
NodeId nodeId,
NodeId referenceTypeId,
QualifiedName browseName,
uint numericId,
NodeId typeDefinitionId,
object configuration)
{
CheckNodeManagerState();
// remove links to shared node.
NodeManager.UnreferenceSharedNode(this, referenceTypeId, false, browseName);
// initialize replacement.
child.Initialize(nodeId, referenceTypeId, browseName, numericId, typeDefinitionId);
// add replacement to the address space.
child.Create(this.NodeId, child.ReferenceTypeId, null, null, child.NumericId, configuration);
// return replacement.
return child;
}
/// <summary>
/// Creates the children for the node.
/// </summary>
protected virtual BaseInstanceSource DeleteChild(BaseInstanceSource child)
{
// delete from the address space.
child.Delete();
// dispose it.
child.Dispose();
// remove reference.
return null;
}