private HqlTreeNode TranslateInequalityComparison(BinaryExpression expression)
{
var lhs = VisitExpression(expression.Left).ToArithmeticExpression();
var rhs = VisitExpression(expression.Right).ToArithmeticExpression();
// Check for nulls on left or right.
if (VisitorUtil.IsNullConstant(expression.Right))
{
rhs = null;
}
if (VisitorUtil.IsNullConstant(expression.Left))
{
lhs = null;
}
if (lhs == null && rhs == null)
{
return(_hqlTreeBuilder.False());
}
if (lhs == null)
{
return(_hqlTreeBuilder.IsNotNull(rhs));
}
if (rhs == null)
{
return(_hqlTreeBuilder.IsNotNull(lhs));
}
var lhsNullable = _nullableExpressionDetector.IsNullable(expression.Left, expression);
var rhsNullable = _nullableExpressionDetector.IsNullable(expression.Right, expression);
var inequality = _hqlTreeBuilder.Inequality(lhs, rhs);
if (!lhsNullable && !rhsNullable)
{
return(inequality);
}
var lhs2 = VisitExpression(expression.Left).ToArithmeticExpression();
var rhs2 = VisitExpression(expression.Right).ToArithmeticExpression();
HqlBooleanExpression booleanExpression;
if (lhsNullable && rhsNullable)
{
booleanExpression = _hqlTreeBuilder.Inequality(
_hqlTreeBuilder.IsNull(lhs2).ToArithmeticExpression(),
_hqlTreeBuilder.IsNull(rhs2).ToArithmeticExpression());
}
else if (lhsNullable)
{
booleanExpression = _hqlTreeBuilder.IsNull(lhs2);
}
else
{
booleanExpression = _hqlTreeBuilder.IsNull(rhs2);
}
return(_hqlTreeBuilder.BooleanOr(inequality, booleanExpression));
}
protected HqlTreeNode VisitBinaryExpression(BinaryExpression expression)
{
var lhs = VisitExpression(expression.Left).AsExpression();
var rhs = VisitExpression(expression.Right).AsExpression();
switch (expression.NodeType)
{
case ExpressionType.Equal:
return(TranslateEqualityComparison(expression, lhs, rhs,
expr => _hqlTreeBuilder.IsNull(expr),
(l, r) => _hqlTreeBuilder.Equality(l, r)));
case ExpressionType.NotEqual:
return(TranslateEqualityComparison(expression, lhs, rhs,
expr => _hqlTreeBuilder.IsNotNull(expr),
(l, r) => _hqlTreeBuilder.Inequality(l, r)));
case ExpressionType.And:
return(_hqlTreeBuilder.BitwiseAnd(lhs, rhs));
case ExpressionType.AndAlso:
return(_hqlTreeBuilder.BooleanAnd(lhs.AsBooleanExpression(), rhs.AsBooleanExpression()));
case ExpressionType.Or:
return(_hqlTreeBuilder.BitwiseOr(lhs, rhs));
case ExpressionType.OrElse:
return(_hqlTreeBuilder.BooleanOr(lhs.AsBooleanExpression(), rhs.AsBooleanExpression()));
case ExpressionType.Add:
if (expression.Left.Type == typeof(string) && expression.Right.Type == typeof(string))
{
return(_hqlTreeBuilder.MethodCall("concat", lhs, rhs));
}
return(_hqlTreeBuilder.Add(lhs, rhs));
case ExpressionType.Subtract:
return(_hqlTreeBuilder.Subtract(lhs, rhs));
case ExpressionType.Multiply:
return(_hqlTreeBuilder.Multiply(lhs, rhs));
case ExpressionType.Divide:
return(_hqlTreeBuilder.Divide(lhs, rhs));
case ExpressionType.Modulo:
return(_hqlTreeBuilder.MethodCall("mod", lhs, rhs));
case ExpressionType.LessThan:
return(_hqlTreeBuilder.LessThan(lhs, rhs));
case ExpressionType.LessThanOrEqual:
return(_hqlTreeBuilder.LessThanOrEqual(lhs, rhs));
case ExpressionType.GreaterThan:
return(_hqlTreeBuilder.GreaterThan(lhs, rhs));
case ExpressionType.GreaterThanOrEqual:
return(_hqlTreeBuilder.GreaterThanOrEqual(lhs, rhs));
case ExpressionType.Coalesce:
return(_hqlTreeBuilder.Coalesce(lhs, rhs));
}
throw new InvalidOperationException();
}
protected HqlTreeNode VisitBinaryExpression(BinaryExpression expression)
{
var lhs = VisitExpression(expression.Left).AsExpression();
var rhs = VisitExpression(expression.Right).AsExpression();
switch (expression.NodeType)
{
case ExpressionType.Equal:
// Need to check for boolean equality
if (lhs is HqlBooleanExpression || rhs is HqlBooleanExpression)
{
lhs =
_hqlTreeBuilder.Case(
new [] { _hqlTreeBuilder.When(lhs, _hqlTreeBuilder.Constant(true)) },
_hqlTreeBuilder.Constant(false));
rhs =
_hqlTreeBuilder.Case(
new [] { _hqlTreeBuilder.When(rhs, _hqlTreeBuilder.Constant(true)) },
_hqlTreeBuilder.Constant(false));
return(_hqlTreeBuilder.Equality(lhs, rhs));
}
// Check for nulls on left or right.
if (expression.Right is ConstantExpression &&
expression.Right.Type.IsNullableOrReference() &&
((ConstantExpression)expression.Right).Value == null)
{
return(_hqlTreeBuilder.IsNull(lhs));
}
if (expression.Left is ConstantExpression &&
expression.Left.Type.IsNullableOrReference() &&
((ConstantExpression)expression.Left).Value == null)
{
return(_hqlTreeBuilder.IsNull(rhs));
}
// Nothing was null, use standard equality.
return(_hqlTreeBuilder.Equality(lhs, rhs));
case ExpressionType.NotEqual:
// Need to check for boolean in-equality
if (lhs is HqlBooleanExpression || rhs is HqlBooleanExpression)
{
lhs =
_hqlTreeBuilder.Case(
new [] { _hqlTreeBuilder.When(lhs, _hqlTreeBuilder.Constant(true)) },
_hqlTreeBuilder.Constant(false));
rhs =
_hqlTreeBuilder.Case(
new [] { _hqlTreeBuilder.When(rhs, _hqlTreeBuilder.Constant(true)) },
_hqlTreeBuilder.Constant(false));
return(_hqlTreeBuilder.Inequality(lhs, rhs));
}
// Check for nulls on left or right.
if (expression.Right is ConstantExpression &&
expression.Right.Type.IsNullableOrReference() &&
((ConstantExpression)expression.Right).Value == null)
{
return(_hqlTreeBuilder.IsNotNull(lhs));
}
if (expression.Left is ConstantExpression &&
expression.Left.Type.IsNullableOrReference() &&
((ConstantExpression)expression.Left).Value == null)
{
return(_hqlTreeBuilder.IsNotNull(rhs));
}
// Nothing was null, use standard inequality.
return(_hqlTreeBuilder.Inequality(lhs, rhs));
case ExpressionType.And:
return(_hqlTreeBuilder.BitwiseAnd(lhs, rhs));
case ExpressionType.AndAlso:
return(_hqlTreeBuilder.BooleanAnd(lhs.AsBooleanExpression(), rhs.AsBooleanExpression()));
case ExpressionType.Or:
return(_hqlTreeBuilder.BitwiseOr(lhs, rhs));
case ExpressionType.OrElse:
return(_hqlTreeBuilder.BooleanOr(lhs.AsBooleanExpression(), rhs.AsBooleanExpression()));
case ExpressionType.Add:
return(_hqlTreeBuilder.Add(lhs, rhs));
case ExpressionType.Subtract:
return(_hqlTreeBuilder.Subtract(lhs, rhs));
case ExpressionType.Multiply:
return(_hqlTreeBuilder.Multiply(lhs, rhs));
case ExpressionType.Divide:
return(_hqlTreeBuilder.Divide(lhs, rhs));
case ExpressionType.LessThan:
return(_hqlTreeBuilder.LessThan(lhs, rhs));
case ExpressionType.LessThanOrEqual:
return(_hqlTreeBuilder.LessThanOrEqual(lhs, rhs));
case ExpressionType.GreaterThan:
return(_hqlTreeBuilder.GreaterThan(lhs, rhs));
case ExpressionType.GreaterThanOrEqual:
return(_hqlTreeBuilder.GreaterThanOrEqual(lhs, rhs));
case ExpressionType.Coalesce:
return(_hqlTreeBuilder.Coalesce(lhs, rhs));
}
throw new InvalidOperationException();
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
var isNull = treeBuilder.IsNull(visitor.Visit(arguments[0]).AsExpression());
return(isNull);
}