private Trail handleNoTrueChild(Trail trail) {
TreeModel treeModel = getModel();
TreeModel.NoTrueChildStrategy noTrueChildStrategy = treeModel.getNoTrueChildStrategy();
switch (noTrueChildStrategy) {
case RETURN_NULL_PREDICTION:
return trail.selectNull();
case RETURN_LAST_PREDICTION:
Node lastPrediction = trail.getLastPrediction();
// "Return the parent Node only if it specifies a score attribute"
if (lastPrediction.hasScore()) {
return trail.selectLastPrediction();
}
return trail.selectNull();
default:
throw new UnsupportedFeatureException(treeModel, noTrueChildStrategy);
}
}
private Node evaluateTree(Trail trail, EvaluationContext context) {
TreeModel treeModel = getModel();
Node root = treeModel.getNode();
Boolean status = evaluateNode(trail, root, context);
if (status != null && status.booleanValue()) {
trail = handleTrue(trail, root, context);
Node node = trail.getResult();
// "It is not possible that the scoring process ends in a Node which does not have a score
// attribute"
if (node != null && !node.hasScore()) {
throw new InvalidFeatureException(node);
}
return node;
}
return null;
}