public NhLinqExpression(Expression expression, ISessionFactoryImplementor sessionFactory)
{
_expression = NhPartialEvaluatingExpressionTreeVisitor.EvaluateIndependentSubtrees(expression);
// We want logging to be as close as possible to the original expression sent from the
// application. But if we log before partial evaluation, the log won't include e.g.
// subquery expressions if those are defined by the application in a variable referenced
// from the main query.
LinqLogging.LogExpression("Expression (partially evaluated)", _expression);
_constantToParameterMap = ExpressionParameterVisitor.Visit(_expression, sessionFactory);
ParameterValuesByName = _constantToParameterMap.Values.ToDictionary(p => p.Name,
p => System.Tuple.Create(p.Value, p.Type));
Key = ExpressionKeyVisitor.Visit(_expression, _constantToParameterMap);
Type = _expression.Type;
// Note - re-linq handles return types via the GetOutputDataInfo method, and allows for SingleOrDefault here for the ChoiceResultOperator...
ReturnType = NhLinqExpressionReturnType.Scalar;
if (typeof(IQueryable).IsAssignableFrom(Type))
{
Type = Type.GetGenericArguments()[0];
ReturnType = NhLinqExpressionReturnType.Sequence;
}
}
public NhLinqExpression(Expression expression, ISessionFactoryImplementor sessionFactory)
{
_expression = NhPartialEvaluatingExpressionTreeVisitor.EvaluateIndependentSubtrees(expression);
_constantToParameterMap = ExpressionParameterVisitor.Visit(_expression, sessionFactory);
ParameterValuesByName = _constantToParameterMap.Values.ToDictionary(p => p.Name,
p =>
new Tuple <object, IType> {
First = p.Value, Second = p.Type
});
Key = ExpressionKeyVisitor.Visit(_expression, _constantToParameterMap);
Type = _expression.Type;
// Note - re-linq handles return types via the GetOutputDataInfo method, and allows for SingleOrDefault here for the ChoiceResultOperator...
ReturnType = NhLinqExpressionReturnType.Scalar;
if (typeof(IQueryable).IsAssignableFrom(Type))
{
Type = Type.GetGenericArguments()[0];
ReturnType = NhLinqExpressionReturnType.Sequence;
}
}
/// <summary>
/// Applies the minimal transformations required before parameterization,
/// expression key computing and parsing.
/// </summary>
/// <param name="expression">The expression to transform.</param>
/// <returns>The transformed expression.</returns>
public static Expression PreTransform(Expression expression)
{
var partiallyEvaluatedExpression = NhPartialEvaluatingExpressionTreeVisitor.EvaluateIndependentSubtrees(expression);
return(PreProcessor.Process(partiallyEvaluatedExpression));
}
