private SqlSelectStatement VisitFilterExpression(PredicateBinding input, Predicate predicate, bool negatePredicate)
{
Symbol fromSymbol;
var result = VisitInputExpression(input.Predicate, input.VariableName, input.VariableType, out fromSymbol);
if (!IsCompatible(result, PredicateType.Filter))
{
result = CreateNewSelectStatement(result, input.VariableName, input.VariableType, out fromSymbol);
}
selectStatementStack.Push(result);
symbolTable.EnterScope();
AddFromSymbol(result, input.VariableName, fromSymbol);
if (negatePredicate)
{
result.Where.Append("NOT (");
}
result.Where.Append(predicate.Accept(this));
if (negatePredicate)
{
result.Where.Append(")");
}
symbolTable.ExitScope();
selectStatementStack.Pop();
return(result);
}
internal Predicate Filter(PredicateBinding input, Predicate predicate)
{
return(input.Filter(predicate));
}
internal Predicate Project(PredicateBinding input, Predicate projection)
{
return(input.Project(projection));
}
internal Predicate TranslateLambda(LambdaExpression lambda, Predicate input, out PredicateBinding binding)
{
input = NormalizeSetSource(input);
binding = input.BindAs(_aliasGenerator.Next());
return(TranslateLambda(lambda, binding.Variable));
}
protected override Predicate TranslateOneLambda(PredicateConverter parent, PredicateBinding sourceBinding, Predicate lambda)
{
return(parent.Project(sourceBinding, lambda));
}
protected abstract Predicate TranslateOneLambda(PredicateConverter parent, PredicateBinding sourceBinding, Predicate lambda);
protected Predicate Translate(PredicateConverter parent, MethodCallExpression call, out Predicate source, out PredicateBinding sourceBinding, out Predicate lambda)
{
source = parent.TranslateExpression(call.Arguments[0]);
var lambdaExpression = parent.GetLambdaExpression(call, 1);
lambda = parent.TranslateLambda(lambdaExpression, source, out sourceBinding);
return(TranslateOneLambda(parent, sourceBinding, lambda));
}
