@Override
public Tuple<Collection<BasicOperator>, Collection<BasicOperator>> transformOperatorGraph(
final Map<String, BasicOperator> mso, final BasicOperator rootOperator) {
final GenerateAddEnv genAdd = (GenerateAddEnv) mso.get("genAdd");
final Optional optional = (Optional) mso.get("optional");
final LinkedList<BasicOperator> pres =
(LinkedList<BasicOperator>) genAdd.getPrecedingOperators();
final LinkedList<OperatorIDTuple> succs =
(LinkedList<OperatorIDTuple>) optional.getSucceedingOperators();
BasicOperator pre;
for (int i = 0; i < pres.size(); i++) {
pre = pres.get(i);
pre.addSucceedingOperator(new OperatorIDTuple(optional, 0));
pre.removeSucceedingOperator(genAdd);
optional.addPrecedingOperator(pre);
}
optional.removePrecedingOperator(genAdd);
optional.setSucceedingOperator(new OperatorIDTuple(genAdd, 0));
genAdd.setPrecedingOperator(optional);
genAdd.setSucceedingOperators(succs);
BasicOperator succ;
for (int i = 0; i < succs.size(); i++) {
succ = succs.get(i).getOperator();
succ.addPrecedingOperator(genAdd);
succ.removePrecedingOperator(optional);
}
rootOperator.deleteParents();
rootOperator.setParents();
rootOperator.detectCycles();
rootOperator.sendMessage(new BoundVariablesMessage());
return null;
}
