/// <summary>
/// Split the set according to a test.
/// </summary>
/// <param name="test"></param>
/// <returns></returns>
public override IEnumerable <ItemSet> Split(Test test)
{
WeightedItemSet[] sets = new WeightedItemSet[test.NumOfIssues];
double[] setSizes = new double[test.NumOfIssues];
double setSizeSum = 0.0d;
List <Item> unkonwnItems = new List <Item>();
List <double> unknownItemsWeights = new List <double>();
for (int i = 0; i < sets.Length; i++)
{
sets[i] = new WeightedItemSet(this._attributeSet);
}
for (int i = 0; i < this._items.Count; i++)
{
Item it = this._items[i];
double weight = this._weights[i];
AttributeValue val = it.ValueOf(this._attributeSet, test.Attribute);
if (val.IsUnknown())
{
unkonwnItems.Add(it);
unknownItemsWeights.Add(weight);
}
else
{
int id = test.Perform(val);
sets[id].Add(it, weight);
}
}
for (int i = 0; i < sets.Length; i++)
{
setSizes[i] = sets[i].Size();
setSizeSum += setSizes[i];
}
for (int i = 0; i < unkonwnItems.Count; i++)
{
Item it = unkonwnItems[i];
double weight = unknownItemsWeights[i];
for (int j = 0; j < sets.Length; j++)
{
sets[j].Add(it, weight * setSizes[j] / setSizeSum);
}
}
return(sets);
}
/// <summary>
/// Applies the test. The test checks if an attribute value belongs to a given set of values.
/// </summary>
/// <param name="val">The value to test. </param>
/// <returns>1 - the value belongs to the set of admitted values, 0 - otherwise.</returns>
public override int Perform(AttributeValue val)
{
if (val.IsUnknown())
{
throw new ArgumentException("Cannot perform test on an unknow value.s");
}
if (!(val is KnownSymbolicValue))
{
throw new InvalidOperationException("Value is not KnowSymbolicValue");
}
return(Perform((KnownSymbolicValue)val));
}
