How to use

PhotonService

in

slash.navigation.photon

private FeatureCollection getResultFor(String uri) throws IOException {
  String result = execute(uri);
  if (result != null) {
    try {
      return new ObjectMapper().readValue(result, FeatureCollection.class);
    } catch (JsonParseException | JsonMappingException e) {
      throw new IOException("Cannot unmarshall " + result + ": " + e, e);
    }
  }
  return null;
}

public List<NavigationPosition> getPositionsFor(String address) throws IOException {
  FeatureCollection collection = getResultFor("/api/?q=" + encodeUri(address) + "&limit=10");
  if (collection == null)
    return null;
  return extractPositions(collection.getFeatures());
}

  private String getDisplayName(Feature feature) {
    String result = getProperty(feature, "name");
    if(result.length() > 0)
      result += ", ";
    String postcode = getProperty(feature, "postcode");
    if(postcode.length() > 0)
      result += postcode;
    String city = getProperty(feature, "city");
    if(city.length() > 0)
      result += " " + city;
    String state = getProperty(feature, "state");
    if(state.length() > 0)
      result += ", " + state;
    String country = getProperty(feature, "country");
    if(country.length() > 0)
      result += ", " + country;

    result = result.replaceAll(" {2}", " ");
    if(result.endsWith(", "))
      result = result.substring(0, result.length() - 2);
    return result;
  }
}

public String getAddressFor(NavigationPosition position) throws IOException {
  FeatureCollection collection = getResultFor("/reverse/?lon=" + position.getLongitude() + "&lat=" + position.getLatitude());
  if (collection == null)
    return null;
  List<Feature> features = collection.getFeatures();
  if (features.size() == 0)
    return null;
  Feature feature = features.get(0);
  GeoJsonObject geometry = feature.getGeometry();
  if (!(geometry instanceof Point))
    return null;
  return getDisplayName(feature);
}

private String execute(String uri) throws IOException {
  String url = getPhotonUrl() + uri;
  Get get = new Get(url);
  String result = get.executeAsString();
  if (get.isSuccessful())
    return result;
  return null;
}

private List<NavigationPosition> extractPositions(List<Feature> features) {
  List<NavigationPosition> result = new ArrayList<>(features.size());
  for (Feature feature : features) {
    GeoJsonObject geometry = feature.getGeometry();
    if (!(geometry instanceof Point))
      continue;
    Point point = (Point) geometry;
    LngLatAlt lngLatAlt = point.getCoordinates();
    String type = feature.getProperty("osm_key");
    result.add(new SimpleNavigationPosition(lngLatAlt.getLongitude(), lngLatAlt.getLatitude(), null,
        getDisplayName(feature) + " (" + type + ")"));
  }
  return result;
}

protected void initializeGeocodingServices() {
  AutomaticGeocodingService service = new AutomaticGeocodingService(getGeocodingServiceFacade());
  getGeocodingServiceFacade().addGeocodingService(service);
  getGeocodingServiceFacade().setPreferredGeocodingService(service);
  getGeocodingServiceFacade().addGeocodingService(new GeoNamesService());
  getGeocodingServiceFacade().addGeocodingService(new NominatimService());
  getGeocodingServiceFacade().addGeocodingService(new PhotonService());
}