/**
* Check all nodes to see if their labels are consistent. If any are not, return false
*
* @return <code>true</code> if the edge area labels are consistent at this node
*/
private boolean isNodeEdgeAreaLabelsConsistent() {
for (Iterator nodeIt = nodeGraph.getNodeIterator(); nodeIt.hasNext(); ) {
RelateNode node = (RelateNode) nodeIt.next();
if (!node.getEdges().isAreaLabelsConsistent(geomGraph)) {
invalidPoint = (Coordinate) node.getCoordinate().clone();
return false;
}
}
return true;
}
/**
* 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;
}
/**
* Check all nodes to see if their labels are consistent with area topology.
*
* @return <code>true</code> if this area has a consistent node labelling
*/
public boolean isNodeConsistentArea() {
/**
* To fully check validity, it is necessary to compute ALL intersections, including
* self-intersections within a single edge.
*/
SegmentIntersector intersector = geomGraph.computeSelfNodes(li, true);
if (intersector.hasProperIntersection()) {
invalidPoint = intersector.getProperIntersectionPoint();
return false;
}
nodeGraph.build(geomGraph);
return isNodeEdgeAreaLabelsConsistent();
}