checkClosedRings method
Implementation
void checkClosedRings(Polygon poly) {
checkClosedRing(poly.getExteriorRing());
if (validErr != null) return;
for (int i = 0; i < poly.getNumInteriorRing(); i++) {
checkClosedRing(poly.getInteriorRingN(i));
if (validErr != null) return;
}
}