Iterator<DefaultGraphCell> iterCellsList = cellsList.iterator();
ReachabilityEdgeModel returnEdge = new ReachabilityEdgeModel(arc.getTrigger());
int differ = 1;
if (cellsList != null && !cellsList.isEmpty()) {
while (iterCellsList.hasNext()) {
DefaultGraphCell cell = iterCellsList.next();
if (cell instanceof ReachabilityEdgeModel) {
ReachabilityEdgeModel edge = (ReachabilityEdgeModel) cell;
// Source
ReachabilityPortModel srcRpom = (ReachabilityPortModel) edge.getSource();
ReachabilityPlaceModel srcRplm = (ReachabilityPlaceModel) srcRpom.getParent();