internal HqlBooleanExpression BuildOfType(Expression expression, System.Type type)
{
var sessionFactory = _parameters.SessionFactory;
var meta = sessionFactory.GetClassMetadata(type) as Persister.Entity.AbstractEntityPersister;
if (meta != null && !meta.IsExplicitPolymorphism)
{
//Adapted the logic found in SingleTableEntityPersister.DiscriminatorFilterFragment
var nodes = meta
.SubclassClosure
.Select(typeName => (NHibernate.Persister.Entity.IQueryable)sessionFactory.GetEntityPersister(typeName))
.Where(persister => !persister.IsAbstract)
.Select(persister => _hqlTreeBuilder.Ident(persister.EntityName))
.ToList();
if (nodes.Count == 1)
{
return(_hqlTreeBuilder.Equality(
_hqlTreeBuilder.Dot(Visit(expression).AsExpression(), _hqlTreeBuilder.Class()),
nodes[0]));
}
if (nodes.Count > 1)
{
return(_hqlTreeBuilder.In(
_hqlTreeBuilder.Dot(
Visit(expression).AsExpression(),
_hqlTreeBuilder.Class()),
_hqlTreeBuilder.ExpressionSubTreeHolder(nodes)));
}
if (nodes.Count == 0)
{
const string abstractClassWithNoSubclassExceptionMessageTemplate =
@"The class {0} can't be instatiated and does not have mapped subclasses;
possible solutions:
- don't map the abstract class
- map its subclasses.";
throw new NotSupportedException(string.Format(abstractClassWithNoSubclassExceptionMessageTemplate, meta.EntityName));
}
}
return(_hqlTreeBuilder.Equality(
_hqlTreeBuilder.Dot(Visit(expression).AsExpression(), _hqlTreeBuilder.Class()),
_hqlTreeBuilder.Ident(type.FullName)));
}
private HqlTreeNode VisitTypeBinaryExpression(TypeBinaryExpression expression)
{
return(_hqlTreeBuilder.Equality(
_hqlTreeBuilder.Dot(
Visit(expression.Expression).AsExpression(),
_hqlTreeBuilder.Class()),
_hqlTreeBuilder.Ident(expression.TypeOperand.FullName)));
}
