/// <summary>
/// Gets answer containing the question confirmation.
/// </summary>
/// <param name="reader">The reader containing question wildcard.</param>
/// <param name="question">The question.</param>
/// <returns>The answer if available, <c>null</c> otherwise.</returns>
private TripletTree getAnswerWithQuestionConfirmation(WildcardReader reader, TripletTree question)
{
var isYesNoQuestion = Predicate.About.Equals(question.Predicate); //TODO better yes no resolving
if (!isYesNoQuestion)
throw new NotImplementedException();
var questionObject = question.Object as TripletTree;
if (reader.HasEvidence)
{
//there is evidence for the positive answer
return questionObject;
}
else if (reader.HasNegativeEvidence)
{
return questionObject.Negation;
}
return null;
}
/// <summary>
/// Finds best precondition which can be presented to the user according to question
/// in the reader.
/// </summary>
/// <param name="reader">Reader which request is searched.</param>
/// <returns>The request if any, <c>null</c> otherwise.</returns>
private TripletTree findBestPrecondition(WildcardReader reader)
{
var preconditions = reader.GetPreconditions().Take(100).ToList();
preconditions.Sort((a, b) => a.Score.CompareTo(b.Score));
var bestCondition = preconditions.Where(p => !_askedPreconditions.Contains(toTriplet(p.Wildcard))).LastOrDefault();
if (bestCondition == null)
return null;
return toTriplet(bestCondition.Wildcard);
}