public static void relinkOutgoingArcs(PetriNet net, Node from, Node to) {
for (Flow f : net.getFlowRelation()) {
if (f.getSource().equals(from)) {
net.addFlow(to, f.getTarget());
net.removeEdge(f);
}
}
}
public static void splitMixedPlaces(PetriNet net) {
// perform node splitting (places)
Collection<Place> ps = new ArrayList<Place>(net.getPlaces());
Iterator<Place> places = ps.iterator();
while (places.hasNext()) {
Place place = places.next();
if (net.getPredecessors(place).size() > 1 && net.getSuccessors(place).size() > 1) {
Place newP = addPlace(net);
Transition newT = addTransition(net);
relinkOutgoingArcs(net, place, newP);
net.addFlow(place, newT);
net.addFlow(newT, newP);
}
}
}
public static void isolateTransitions(PetriNet net) {
Collection<Transition> ts = new ArrayList<Transition>(net.getTransitions());
Iterator<Transition> transitions = ts.iterator();
while (transitions.hasNext()) {
Transition transition = transitions.next();
if (net.getPredecessors(transition).size() > 1) {
Place newP = addPlace(net);
Transition newT = addTransition(net);
relinkIncomingArcs(net, transition, newT);
net.addFlow(newT, newP);
net.addFlow(newP, transition);
}
if (net.getSuccessors(transition).size() > 1) {
Place newP = addPlace(net);
Transition newT = addTransition(net);
relinkOutgoingArcs(net, transition, newT);
net.addFlow(transition, newP);
net.addFlow(newP, newT);
}
}
}
public static Place addPlace(PetriNet net) {
Place newP = new Place();
newP.setId(getId());
net.addNode(newP);
return newP;
}
public static Transition addTransition(PetriNet net) {
Transition newT = new Transition();
newT.setId(getId());
net.addNode(newT);
return newT;
}
