public Collection<CallEdge> getCallEdges() {
Collection<CallEdge> cf = new ArrayList<CallEdge>();
for (Collection<CallEdge> c : cedges.values()) cf.addAll(c);
return cf;
}
public Collection<FieldEdge> getFieldEdges() {
Collection<FieldEdge> cf = new ArrayList<FieldEdge>();
for (Collection<FieldEdge> c : fedges.values()) cf.addAll(c);
return cf;
}