How to use

PrepareContractionHierarchies$Shortcut

in

com.graphhopper.routing.ch

  @Override
  public void foundShortcut(int u_fromNode, int w_toNode,
               double existingDirectWeight, double existingDistSum,
               EdgeIterator outgoingEdges,
               int skippedEdge1, int incomingEdgeOrigCount) {
    // FOUND shortcut
    // but be sure that it is the only shortcut in the collection
    // and also in the graph for u->w. If existing AND identical weight => update setProperties.
    // Hint: shortcuts are always one-way due to distinct level of every node but we don't
    // know yet the levels so we need to determine the correct direction or if both directions
    Shortcut sc = new Shortcut(u_fromNode, w_toNode, existingDirectWeight, existingDistSum);
    if (shortcuts.containsKey(sc))
      return;
    Shortcut tmpSc = new Shortcut(w_toNode, u_fromNode, existingDirectWeight, existingDistSum);
    Shortcut tmpRetSc = shortcuts.get(tmpSc);
    if (tmpRetSc != null) {
      // overwrite flags only if skipped edges are identical
      if (tmpRetSc.skippedEdge2 == skippedEdge1 && tmpRetSc.skippedEdge1 == outgoingEdges.getEdge()) {
        tmpRetSc.flags = PrepareEncoder.getScDirMask();
        return;
      }
    }
    Shortcut old = shortcuts.put(sc, sc);
    if (old != null)
      throw new IllegalStateException("Shortcut did not exist (" + sc + ") but was overwriting another one? " + old);
    sc.skippedEdge1 = skippedEdge1;
    sc.skippedEdge2 = outgoingEdges.getEdge();
    sc.originalEdges = incomingEdgeOrigCount + getOrigEdgeCount(outgoingEdges.getEdge());
  }
}

Shortcut sc = new Shortcut(u_fromNode, w_toNode, existingDirectWeight, existingDistSum);
if (shortcuts.containsKey(sc))
  return;
Shortcut tmpSc = new Shortcut(w_toNode, u_fromNode, existingDirectWeight, existingDistSum);
Shortcut tmpRetSc = shortcuts.get(tmpSc);
if (tmpRetSc != null)