private HqlTreeNode TranslateEqualityComparison(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.True());
}
if (lhs == null)
{
return(_hqlTreeBuilder.IsNull(rhs));
}
if (rhs == null)
{
return(_hqlTreeBuilder.IsNull((lhs)));
}
var lhsNullable = IsNullable(lhs);
var rhsNullable = IsNullable(rhs);
var equality = _hqlTreeBuilder.Equality(lhs, rhs);
if (!lhsNullable || !rhsNullable)
{
return(equality);
}
var lhs2 = VisitExpression(expression.Left).ToArithmeticExpression();
var rhs2 = VisitExpression(expression.Right).ToArithmeticExpression();
return(_hqlTreeBuilder.BooleanOr(
equality,
_hqlTreeBuilder.BooleanAnd(
_hqlTreeBuilder.IsNull(lhs2),
_hqlTreeBuilder.IsNull(rhs2))));
}
protected override Expression VisitMethodCall(MethodCallExpression expression)
{
if (expression.Method.Name == nameof(LinqExtensionMethods.MappedAs) && expression.Method.DeclaringType == typeof(LinqExtensionMethods))
{
var rawParameter = Visit(expression.Arguments[0]);
var parameter = rawParameter as ConstantExpression;
var type = expression.Arguments[1] as ConstantExpression;
if (parameter == null)
{
throw new HibernateException(
$"{nameof(LinqExtensionMethods.MappedAs)} must be called on an expression which can be evaluated as " +
$"{nameof(ConstantExpression)}. It was call on {rawParameter?.GetType().Name ?? "null"} instead.");
}
if (type == null)
{
throw new HibernateException(
$"{nameof(LinqExtensionMethods.MappedAs)} type must be supplied as {nameof(ConstantExpression)}. " +
$"It was {expression.Arguments[1]?.GetType().Name ?? "null"} instead.");
}
_parameters[parameter].Type = (IType)type.Value;
return(parameter);
}
var method = expression.Method.IsGenericMethod
? expression.Method.GetGenericMethodDefinition()
: expression.Method;
if (_pagingMethods.Contains(method) && !_sessionFactory.Dialect.SupportsVariableLimit)
{
//TODO: find a way to make this code cleaner
var query = Visit(expression.Arguments[0]);
var arg = expression.Arguments[1];
if (query == expression.Arguments[0])
{
return(expression);
}
return(Expression.Call(null, expression.Method, query, arg));
}
if (VisitorUtil.IsDynamicComponentDictionaryGetter(expression, _sessionFactory))
{
return(expression);
}
return(base.VisitMethodCall(expression));
}
private static bool IsConstructionToNullComparison(Expression expression)
{
var testExpression = expression as BinaryExpression;
if (testExpression != null)
{
if ((IsConstruction(testExpression.Left) && VisitorUtil.IsNullConstant(testExpression.Right)) ||
(IsConstruction(testExpression.Right) && VisitorUtil.IsNullConstant(testExpression.Left)))
{
return(true);
}
}
return(false);
}
protected override Expression VisitConditional(ConditionalExpression expression)
{
var testExpression = Visit(expression.Test);
bool testExprResult;
if (VisitorUtil.IsBooleanConstant(testExpression, out testExprResult))
{
if (testExprResult)
{
return(Visit(expression.IfTrue));
}
return(Visit(expression.IfFalse));
}
return(base.VisitConditional(expression));
}
protected override Expression VisitBinary(BinaryExpression expression)
{
var result = base.VisitBinary(expression);
if (expression.NodeType == ExpressionType.AndAlso)
{
HandleBinaryOperation((a, b) => a.AndAlso(b));
}
else if (expression.NodeType == ExpressionType.OrElse)
{
HandleBinaryOperation((a, b) => a.OrElse(b));
}
else if (expression.NodeType == ExpressionType.NotEqual && VisitorUtil.IsNullConstant(expression.Right))
{
// Discard result from right null. Left is visited first, so it's below right on the stack.
_values.Pop();
HandleUnaryOperation(pvs => pvs.IsNotNull());
}
else if (expression.NodeType == ExpressionType.NotEqual && VisitorUtil.IsNullConstant(expression.Left))
{
// Discard result from left null.
var right = _values.Pop();
_values.Pop(); // Discard left.
_values.Push(right);
HandleUnaryOperation(pvs => pvs.IsNotNull());
}
else if (expression.NodeType == ExpressionType.Equal && VisitorUtil.IsNullConstant(expression.Right))
{
// Discard result from right null. Left is visited first, so it's below right on the stack.
_values.Pop();
HandleUnaryOperation(pvs => pvs.IsNull());
}
else if (expression.NodeType == ExpressionType.Equal && VisitorUtil.IsNullConstant(expression.Left))
{
// Discard result from left null.
var right = _values.Pop();
_values.Pop(); // Discard left.
_values.Push(right);
HandleUnaryOperation(pvs => pvs.IsNull());
}
else if (expression.NodeType == ExpressionType.Coalesce)
{
HandleBinaryOperation((a, b) => a.Coalesce(b));
}
else if (expression.NodeType == ExpressionType.Add || expression.NodeType == ExpressionType.AddChecked)
{
HandleBinaryOperation((a, b) => a.Add(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.Divide)
{
HandleBinaryOperation((a, b) => a.Divide(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.Modulo)
{
HandleBinaryOperation((a, b) => a.Modulo(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.Multiply || expression.NodeType == ExpressionType.MultiplyChecked)
{
HandleBinaryOperation((a, b) => a.Multiply(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.Power)
{
HandleBinaryOperation((a, b) => a.Power(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.Subtract || expression.NodeType == ExpressionType.SubtractChecked)
{
HandleBinaryOperation((a, b) => a.Subtract(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.And)
{
HandleBinaryOperation((a, b) => a.And(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.Or)
{
HandleBinaryOperation((a, b) => a.Or(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.ExclusiveOr)
{
HandleBinaryOperation((a, b) => a.ExclusiveOr(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.LeftShift)
{
HandleBinaryOperation((a, b) => a.LeftShift(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.RightShift)
{
HandleBinaryOperation((a, b) => a.RightShift(b, expression.Type));
}
else if (expression.NodeType == ExpressionType.Equal)
{
HandleBinaryOperation((a, b) => a.Equal(b));
}
else if (expression.NodeType == ExpressionType.NotEqual)
{
HandleBinaryOperation((a, b) => a.NotEqual(b));
}
else if (expression.NodeType == ExpressionType.GreaterThanOrEqual)
{
HandleBinaryOperation((a, b) => a.GreaterThanOrEqual(b));
}
else if (expression.NodeType == ExpressionType.GreaterThan)
{
HandleBinaryOperation((a, b) => a.GreaterThan(b));
}
else if (expression.NodeType == ExpressionType.LessThan)
{
HandleBinaryOperation((a, b) => a.LessThan(b));
}
else if (expression.NodeType == ExpressionType.LessThanOrEqual)
{
HandleBinaryOperation((a, b) => a.LessThanOrEqual(b));
}
return(result);
}
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 = IsNullable(lhs);
var rhsNullable = IsNullable(rhs);
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));
}