How to use

com.graphhopper.routing.ch.NodeBasedNodeContractor

constructor

private NodeContractor createNodeContractor() {
  NodeContractor nodeContractor = new NodeBasedNodeContractor(lg, weighting, new PMap());
  nodeContractor.initFromGraph();
  nodeContractor.prepareContraction();
  return nodeContractor;
}

private void initFromGraph() {
  FlagEncoder prepareFlagEncoder = prepareWeighting.getFlagEncoder();
  final EdgeFilter allFilter = DefaultEdgeFilter.allEdges(prepareFlagEncoder);
  maxLevel = prepareGraph.getNodes();
  vehicleAllExplorer = prepareGraph.createEdgeExplorer(allFilter);
  vehicleAllTmpExplorer = prepareGraph.createEdgeExplorer(allFilter);
  // Use an alternative to PriorityQueue as it has some advantages:
  //   1. Gets automatically smaller if less entries are stored => less total RAM used.
  //      Important because Graph is increasing until the end.
  //   2. is slightly faster
  //   but we need the additional oldPriorities array to keep the old value which is necessary for the update method
  sortedNodes = new GHTreeMapComposed();
  oldPriorities = new float[prepareGraph.getNodes()];
  nodeContractor = new NodeBasedNodeContractor(prepareGraph, weighting, pMap);
  nodeContractor.initFromGraph();
}

private void initFromGraph() {
  ghStorage.freeze();
  FlagEncoder prepareFlagEncoder = prepareWeighting.getFlagEncoder();
  final EdgeFilter allFilter = DefaultEdgeFilter.allEdges(prepareFlagEncoder);
  maxLevel = prepareGraph.getNodes();
  vehicleAllExplorer = prepareGraph.createEdgeExplorer(allFilter);
  vehicleAllTmpExplorer = prepareGraph.createEdgeExplorer(allFilter);
  // Use an alternative to PriorityQueue as it has some advantages:
  //   1. Gets automatically smaller if less entries are stored => less total RAM used.
  //      Important because Graph is increasing until the end.
  //   2. is slightly faster
  //   but we need the additional oldPriorities array to keep the old value which is necessary for the update method
  sortedNodes = new GHTreeMapComposed();
  oldPriorities = new float[prepareGraph.getNodes()];
  nodeContractor = new NodeBasedNodeContractor(dir, ghStorage, prepareGraph, weighting, pMap);
  nodeContractor.initFromGraph();
}