/// <summary>
/// Evaluates the tokens bound to this AggregatorNode and generates the list of InferredFacts.
/// </summary>
internal void Evaluate()
{
int cntOfEarlierConditions = lhs.Count - 1;
VariableSubstituter vs = null;
for (int i = cntOfEarlierConditions; i >= 0; i--)
{
Condition earlier_cond = lhs[i];
if (earlier_cond.ConditionType == ConditionType.Positive)
{
for (int f2 = 0; f2 < 3; f2++)
{
Variable o = earlier_cond.Fields[f2] as Variable;
if (o != null && o.Equals(_groupBy))
{
vs = new VariableSubstituter();
vs.FieldNumber = f2;
vs.NumberOfLevelsUp = (cntOfEarlierConditions - i);
vs.BindingPair.Variable = o;
f2 = 3;
i = -1; //escape loop of cntOfEarlierConditions
}
}
}
}
if (vs == null)
{
throw new ApplicationException("Bad rule");
}
Dictionary <Term, List <WME> > sorter = new Dictionary <Term, List <WME> >();
foreach (Token token in _aggregatorNode.Items)
{
Token ptoken = token.GetTokenUp(vs.NumberOfLevelsUp);
Term key = ptoken.WME.Fields[vs.FieldNumber];
if (sorter.ContainsKey(key))
{
List <WME> list = sorter[key];
if (list.Contains(token.WME) == false)
{
list.Add(token.WME);
}
}
else
{
List <WME> list = new List <WME>();
list.Add(token.WME);
sorter.Add(key, list);
}
}
foreach (KeyValuePair <Term, List <WME> > pair in sorter)
{
Term val = _aggregator.Evaluate(pair.Value);
_inferredFacts.Add(new Activation(new WME(pair.Key, _aggregator.Alias, val), _conditionType));
}
}