private void ValidateParam(List <IFactType> inputFactTypes, IFactType outputFactType)
{
if (outputFactType == null)
{
throw new ArgumentNullException(nameof(outputFactType));
}
outputFactType.CannotIsType <ISpecialFact>(nameof(outputFactType));
if (InputFactTypes.Any(factType => factType.EqualsFactType(outputFactType)))
{
throw new ArgumentException("Cannot request a fact calculated according to the rule.", nameof(inputFactTypes));
}
}
