private boolean testCycles(Biconnected bc) {
Set<SimpleCycle> cycles = bc.getSeparatedCycles();
Iterator<SimpleCycle> i = cycles.iterator();
if (!i.hasNext()) return true;
SimpleCycle mainCycle = i.next();
List<Segment> segments = bc.getSegments(mainCycle);
switch (segments.size()) {
case 0:
return true;
case 1:
Segment s = segments.get(0);
if (s.isStringIn(mainCycle)) return true;
else {
System.err.println("TODO : find separated cycle");
return false;
}
default:
SimpleGraph comp = new CompatibilityGraph(mainCycle, segments);
if (!this.tc.isTwoColorable(comp)) return false;
else {
for (Segment s2 : segments) if (!this.isPlanar(s2)) return false;
return true;
}
}
}
/**
* Planarity test with Auslander-Parter algorithm.
*
* @return True if planar
*/
public boolean isPlanar(SimpleGraph g) {
List<Biconnected> biconnecteds = Biconnected.createBiconnectedComponents(g);
boolean planar = true;
for (Biconnected bc : biconnecteds) {
boolean biplan = this.testCycles(bc);
planar = planar && biplan;
}
return planar;
}