public static ValueResolver Create(SimpleReference reference)
{
var objectReference = reference as ObjectReference;
if (!ReferenceEquals(null, objectReference))
{
return(new ObjectValueResolver(objectReference));
}
var functionReference = reference as FunctionReference;
if (!ReferenceEquals(null, functionReference))
{
if (FunctionHandlers.Exists(functionReference.Name))
{
return(new AggregateValueResolver(functionReference));
}
return(new FunctionValueResolver(functionReference));
}
throw new InvalidOperationException("Unresolvable Reference type.");
}
public AggregateValueResolver(FunctionReference reference)
{
_reference = reference;
_argumentResolver = Create(reference.Argument);
_handler = FunctionHandlers.Get(reference.Name);
}
private static bool ReferenceIsNotAggregateFunction(SimpleReference reference)
{
var functionReference = reference as FunctionReference;
return(ReferenceEquals(functionReference, null) || !FunctionHandlers.Exists(functionReference.Name));
}