private void Process(
FetchRequestBase resultOperator,
QueryModelVisitor queryModelVisitor,
IntermediateHqlTree tree,
HqlDot memberPath,
HqlTreeNode currentNode,
IType propType)
{
string alias = null;
if (resultOperator is FetchOneRequest)
{
if (propType == null)
{
var metadata = queryModelVisitor.VisitorParameters.SessionFactory
.GetClassMetadata(resultOperator.RelationMember.ReflectedType);
propType = metadata?.GetPropertyType(resultOperator.RelationMember.Name);
}
if (propType != null && !propType.IsAssociationType)
{
if (currentNode == null)
{
currentNode = tree.GetFromRangeClause()
?? throw new InvalidOperationException($"Property {resultOperator.RelationMember.Name} cannot be fetched for this type of query.");
}
currentNode.AddChild(tree.TreeBuilder.Fetch());
currentNode.AddChild(memberPath);
ComponentType componentType = null;
foreach (var innerFetch in resultOperator.InnerFetchRequests)
{
if (componentType == null)
{
componentType = propType as ComponentType;
if (componentType == null)
{
throw new InvalidOperationException(
$"Property {innerFetch.RelationMember.Name} cannot be fetched from a non component type property {resultOperator.RelationMember.Name}.");
}
}
var subTypeIndex = componentType.GetPropertyIndex(innerFetch.RelationMember.Name);
memberPath = tree.TreeBuilder.Dot(
memberPath,
tree.TreeBuilder.Ident(innerFetch.RelationMember.Name));
Process(innerFetch, queryModelVisitor, tree, memberPath, currentNode, componentType.Subtypes[subTypeIndex]);
}
return;
}
var relatedJoin = queryModelVisitor.RelatedJoinFetchRequests.FirstOrDefault(o => o.Value == resultOperator).Key;
if (relatedJoin != null)
{
alias = queryModelVisitor.VisitorParameters.QuerySourceNamer.GetName(relatedJoin);
}
}
if (alias == null)
{
alias = queryModelVisitor.Model.GetNewName("_");
currentNode = tree.TreeBuilder.LeftFetchJoin(memberPath, tree.TreeBuilder.Alias(alias));
tree.AddFromClause(currentNode);
}
tree.AddDistinctRootOperator();
foreach (var innerFetch in resultOperator.InnerFetchRequests)
{
Process(innerFetch, queryModelVisitor, tree, currentNode, alias);
}
}