/**
* Checks for two duplicate rings in an area. Duplicate rings are rings that are topologically
* equal (that is, which have the same sequence of points up to point order). If the area is
* topologically consistent (determined by calling the <code>isNodeConsistentArea</code>,
* duplicate rings can be found by checking for EdgeBundles which contain more than one EdgeEnd.
* (This is because topologically consistent areas cannot have two rings sharing the same line
* segment, unless the rings are equal). The start point of one of the equal rings will be placed
* in invalidPoint.
*
* @return true if this area Geometry is topologically consistent but has two duplicate rings
*/
public boolean hasDuplicateRings() {
for (Iterator nodeIt = nodeGraph.getNodeIterator(); nodeIt.hasNext(); ) {
RelateNode node = (RelateNode) nodeIt.next();
for (Iterator i = node.getEdges().iterator(); i.hasNext(); ) {
EdgeEndBundle eeb = (EdgeEndBundle) i.next();
if (eeb.getEdgeEnds().size() > 1) {
invalidPoint = eeb.getEdge().getCoordinate(0);
return true;
}
}
}
return false;
}