[GraphHopper] ExtendedStorage for OSM ids

[Diego Guidi]

On Fri, Mar 28, 2014 at 2:43 PM, Bruno Carle <brunocarle at yahoo.com> wrote:
> At the moment I would like to be able to blacklist both nodes and edges, so
> I will stick with the ExtendedStorage.

I've made a slightly different thing.
I've created a "support map" that stores osmid for each node, using
this code (in the extended OsmReader that is similar that the one you
posted):

  @Override
  protected boolean addNode(OSMNode node) {
    boolean added = super.addNode(node);
    if (!added) {
      return false;
    }

    long osmid = node.getId();
    int graphid = this.getInternalNodeIdOfOsmNode(osmid);
    map.put(graphid, osmid);
    return true;
  }


The I've stored this map as an external "support file" inside graph folder:

  private File createSupportFile() throws IOException {
    String dir = this.getGraphStorage().getDirectory().getLocation();
    File file = new File(dir + "/support");
    String path = file.getAbsolutePath();
    if (file.exists()) {
      file.delete();
    }
    if (!file.createNewFile()) {
      throw new IllegalStateException("file not created: " + path);
    }

    String newline = System.getProperty("line.separator");
    Writer fw = new FileWriter(file);
    BufferedWriter bw = new BufferedWriter(fw);
    try {
      for (Integer key : map.keySet()) {
        Long val = map.get(key);
        bw.write(String.format("%d|%d%s", key, val, newline));
      }
    } finally {
      bw.close();
    }
    return file;
  }

Pretty unelegant (ExtendedStorage is the right way to do things, I
suppose) but simple and well working for small graphs (my osm source
file is 22mb).

Hope this can help someone.


Diego Guidi