that = this in Java

Vertex.java

private Comparator<Vertex<Value>> getComparator(){

    final Vertex<Value> that = this;

    return new Comparator<Vertex<Value>>() {
      @Override
      public int compare(Vertex<Value> v1, Vertex<Value> v2) {
        double h1 = heuristic.getCost(that, v1);
        double h2 = heuristic.getCost(that, v2);
        double d1 = that.distanceTo(v1);
        double d2 = that.distanceTo(v2);

        double costOfV1 = h1 + d1;
        double costOfV2 = h2 + d2;

        return (int) (costOfV1 - costOfV2);

      }
    };
  }