How to use

fromGraphHopperStorage

method

in

com.graphhopper.routing.ch.PrepareContractionHierarchies

public void createPreparations(GraphHopperStorage ghStorage, TraversalMode traversalMode) {
  if (!isEnabled() || !preparations.isEmpty())
    return;
  if (weightings.isEmpty())
    throw new IllegalStateException("No CH weightings found");
  traversalMode = getNodeBase();
  for (Weighting weighting : getWeightings()) {
    PrepareContractionHierarchies tmpPrepareCH = PrepareContractionHierarchies.fromGraphHopperStorage(
        ghStorage, weighting, traversalMode);
    tmpPrepareCH.setParams(pMap);
    addPreparation(tmpPrepareCH);
  }
}

@Override
public RoutingAlgorithmFactory createFactory(GraphHopperStorage ghStorage, AlgorithmOptions opts) {
  ghStorage.freeze();
  PrepareContractionHierarchies ch = PrepareContractionHierarchies.fromGraphHopperStorage(
      ghStorage, opts.getWeighting(), TraversalMode.NODE_BASED);
  ch.doWork();
  return ch;
}