protected void calcLastPos(CMStateSet toSet) {
if (type() == XSModelGroupImpl.MODELGROUP_CHOICE) {
// Its the the union of the first positions of our children.
toSet.setTo(fLeftChild.lastPos());
toSet.union(fRightChild.lastPos());
} else if (type() == XSModelGroupImpl.MODELGROUP_SEQUENCE) {
//
// If our right child is nullable, then its the union of our
// children's last positions. Else is our right child's last
// positions.
//
toSet.setTo(fRightChild.lastPos());
if (fRightChild.isNullable()) toSet.union(fLeftChild.lastPos());
} else {
throw new RuntimeException("ImplementationMessages.VAL_BST");
}
}