protected override Expression VisitExpression(Expression expression)
{
if (expression == null)
{
return null;
}
if (_hqlNodes.Contains(expression))
{
// Pure HQL evaluation
var hqlVisitor = new HqlGeneratorExpressionTreeVisitor(_parameterAggregator);
hqlVisitor.Visit(expression);
hqlVisitor.GetHqlTreeNodes().ForEach(n =>_stack.PushLeaf(n) );
return Expression.Convert(Expression.ArrayIndex(_inputParameter, Expression.Constant(_iColumn++)),
expression.Type);
}
// Can't handle this node with HQL. Just recurse down, and emit the expression
return base.VisitExpression(expression);
}
public void Process(AllResultOperator resultOperator, QueryModelVisitor queryModelVisitor, IntermediateHqlTree tree)
{
tree.AddWhereClause(tree.TreeBuilder.BooleanNot(
HqlGeneratorExpressionTreeVisitor.Visit(resultOperator.Predicate, queryModelVisitor.VisitorParameters).
ToBooleanExpression()));
if (tree.IsRoot)
{
tree.AddTakeClause(tree.TreeBuilder.Constant(1));
Expression <Func <IEnumerable <object>, bool> > x = l => !l.Any();
tree.AddListTransformer(x);
// NH-3850: Queries with polymorphism yields many results which must be combined.
Expression <Func <IEnumerable <bool>, bool> > px = l => l.All(r => r);
tree.AddPostExecuteTransformer(px);
}
else
{
tree.SetRoot(tree.TreeBuilder.BooleanNot(tree.TreeBuilder.Exists((HqlQuery)tree.Root)));
}
}
public void Process(ContainsResultOperator resultOperator, QueryModelVisitor queryModelVisitor, IntermediateHqlTree tree)
{
var itemExpression =
HqlGeneratorExpressionTreeVisitor.Visit(resultOperator.Item, queryModelVisitor.VisitorParameters)
.AsExpression();
var from = GetFromRangeClause(tree.Root);
var source = from.Children.First();
if (source is HqlParameter)
{
// This is an "in" style statement
if (IsEmptyList((HqlParameter)source, queryModelVisitor.VisitorParameters))
{
// if the list is empty the expression will always be false, so generate "1 = 0"
tree.SetRoot(tree.TreeBuilder.Equality(tree.TreeBuilder.Constant(1), tree.TreeBuilder.Constant(0)));
}
else
{
tree.SetRoot(tree.TreeBuilder.In(itemExpression, source));
}
}
else
{
// This is an "exists" style statement
if (itemExpression is HqlParameter)
{
tree.AddWhereClause(tree.TreeBuilder.Equality(
tree.TreeBuilder.Ident(GetFromAlias(tree.Root).AstNode.Text),
itemExpression));
tree.SetRoot(tree.TreeBuilder.Exists((HqlQuery)tree.Root));
}
else
{
tree.SetRoot(tree.TreeBuilder.In(itemExpression, tree.Root));
}
}
}
public void Process(ContainsResultOperator resultOperator, QueryModelVisitor queryModelVisitor, IntermediateHqlTree tree)
{
var itemExpression =
HqlGeneratorExpressionTreeVisitor.Visit(resultOperator.Item, queryModelVisitor.VisitorParameters)
.AsExpression();
var from = GetFromRangeClause(tree.Root);
var source = from.Children.First();
if (source is HqlParameter)
{
// This is an "in" style statement
tree.SetRoot(tree.TreeBuilder.In(itemExpression, source));
}
else
{
// This is an "exists" style statement
tree.AddWhereClause(tree.TreeBuilder.Equality(
tree.TreeBuilder.Ident(GetFromAlias(tree.Root).AstNode.Text),
itemExpression));
tree.SetRoot(tree.TreeBuilder.Exists((HqlQuery)tree.Root));
}
}
public void Process(GroupResultOperator resultOperator, QueryModelVisitor queryModelVisitor, IntermediateHqlTree tree)
{
tree.AddGroupByClause(tree.TreeBuilder.GroupBy(
HqlGeneratorExpressionTreeVisitor.Visit(resultOperator.KeySelector, queryModelVisitor.VisitorParameters)
.AsExpression()));
}
public override void VisitAdditionalFromClause(AdditionalFromClause fromClause, QueryModel queryModel, int index)
{
if (fromClause.FromExpression is MemberExpression)
{
var member = (MemberExpression) fromClause.FromExpression;
if (member.Expression is QuerySourceReferenceExpression)
{
// It's a join
var visitor = new HqlGeneratorExpressionTreeVisitor(_parameterAggregator);
visitor.Visit(fromClause.FromExpression);
HqlJoin joinNode = _hqlTreeBuilder.Join(
visitor.GetHqlTreeNodes().Single(),
_hqlTreeBuilder.Alias(fromClause.ItemName));
_fromClause.AddChild(joinNode);
}
}
base.VisitAdditionalFromClause(fromClause, queryModel, index);
}
public override void VisitOrderByClause(OrderByClause orderByClause, QueryModel queryModel, int index)
{
_orderByClause = _hqlTreeBuilder.OrderBy();
foreach (Ordering clause in orderByClause.Orderings)
{
var visitor = new HqlGeneratorExpressionTreeVisitor(_parameterAggregator);
visitor.Visit(clause.Expression);
_orderByClause.AddChild(visitor.GetHqlTreeNodes().Single());
_orderByClause.AddChild(clause.OrderingDirection == OrderingDirection.Asc
? _hqlTreeBuilder.Ascending()
: (HqlTreeNode) _hqlTreeBuilder.Descending());
}
base.VisitOrderByClause(orderByClause, queryModel, index);
}
public override void VisitWhereClause(WhereClause whereClause, QueryModel queryModel, int index)
{
// Visit the predicate to build the query
var visitor = new HqlGeneratorExpressionTreeVisitor(_parameterAggregator);
visitor.Visit(whereClause.Predicate);
// There maybe a where clause in existence already, in which case we AND with it.
if (_whereClause == null)
{
_whereClause = _hqlTreeBuilder.Where(visitor.GetHqlTreeNodes().Single());
}
else
{
HqlAnd mergedPredicates = _hqlTreeBuilder.And(_whereClause.Children.Single(),
visitor.GetHqlTreeNodes().Single());
_whereClause = _hqlTreeBuilder.Where(mergedPredicates);
}
}
private void ProcessGroupByOperator(GroupResultOperator resultOperator)
{
var visitor = new HqlGeneratorExpressionTreeVisitor(_parameterAggregator);
visitor.Visit(resultOperator.KeySelector);
_groupByClause = _hqlTreeBuilder.GroupBy();
_groupByClause.AddChild(visitor.GetHqlTreeNodes().Single());
}
public override void VisitMainFromClause(MainFromClause fromClause, QueryModel queryModel)
{
var visitor = new HqlGeneratorExpressionTreeVisitor(_parameterAggregator);
visitor.Visit(fromClause.FromExpression);
_fromClause = _hqlTreeBuilder.From(
_hqlTreeBuilder.Range(
visitor.GetHqlTreeNodes().Single(),
_hqlTreeBuilder.Alias(fromClause.ItemName)));
base.VisitMainFromClause(fromClause, queryModel);
}
