private Map<Double, List<WaypointLink>> createWaypointLinksByZ() {
Map<Double, List<WaypointLink>> waypointLinksByZMap = new TreeMap<Double, List<WaypointLink>>();
for (WaypointLink wayLink : waypointLinks) {
Waypoint waypoint = waypointByWaypointIdMap.get(wayLink
.getStartPointId());
if (waypointLinksByZMap.get(waypoint.getZ()) == null) {
waypointLinksByZMap.put(waypoint.getZ(),
new ArrayList<WaypointLink>());
}
waypointLinksByZMap.get(waypoint.getZ()).add(wayLink);
}
return waypointLinksByZMap;
}
