internal T RegisterOrReuseChild <T>(T child) where T : EntityNode
{
// Reuse exact matches without re-registering
if (ChildEntityNodes.Contains(child))
{
return(child);
}
EntityNode existing = null;
// Reuse relationships
var asRelationship = child as AccessRelationshipNode;
if (asRelationship != null)
{
// Check to see if there's already a matching relationship node registered
// If so, reuse it
existing = ChildEntityNodes
.OfType <AccessRelationshipNode>()
.FirstOrDefault(rr => rr.AreEquivalent(asRelationship));
}
// Reuse parameters
var asParameter = child as EntityParameterNode;
if (asParameter != null)
{
// Check to see if there's already a matching parameter node registered here
// If so, reuse it
existing = ChildEntityNodes
.OfType <EntityParameterNode>()
.FirstOrDefault(rr => rr.ParameterName == asParameter.ParameterName);
}
if (existing != null)
{
// Only allow an existing node to be reused if neither are coming from a variable, or if both are coming from the same variable
// (Otherwise reuse means sub-clauses in the variable won't be able to find their parent container)
if (child.RootForVariableContainer == existing.RootForVariableContainer)
{
return(existing as T);
}
}
ChildEntityNodes.Add(child);
return(child);
}
internal void RegisterChild(EntityNode child)
{
ChildEntityNodes.Add(child);
}
