/**
   * Synchronizes the local {@link Location} database
   *
   * @param request {@link Request} performed
   * @param response {@link Response} received
   */
  private void getLocationListPerformed(Request<Void> request, Response<List<Location>> response) {
    List<Location> dbList = locHome.getAll();
    HashMap<Integer, Location> loc = new HashMap<Integer, Location>();
    for (Location l : dbList) {
      loc.put(l.getRemoteId(), l);
    }

    List<Location> remote = response.getData();

    for (Location l : remote) {
      if (loc.containsKey(l.getRemoteId())) {
        Location dbLoc = loc.get(l.getRemoteId());
        l.setLocalId(dbLoc.getLocalId());
        if (dbLoc.getMap() != null && l.getMap() != null) {
          ((Map) l.getMap()).setLocalId(((Map) dbLoc.getMap()).getLocalId());
        }

        if (!l.equals(dbLoc)) {
          if (!locHome.update(l)) {
            Log.w(TAG, "update of location " + l + " failed");
          }
        }
      } else {
        if (l.getMap() == null) {
          continue;
        }
        Map m = mapHome.getByRemoteId(((Map) l.getMap()).getRemoteId());

        if (m != null) {
          l.setMap(m);
        }

        locHome.add(l);
      }
    }

    loc.clear();
    for (Location l : remote) {
      loc.put(l.getRemoteId(), l);
    }

    for (Location l : dbList) {
      if (!loc.containsKey(l.getRemoteId())) {
        locHome.remove(l);
      }
    }
  }
  /**
   * Adds {@link Location} if not yet in local database
   *
   * @param request {@link Request} performed
   * @param response {@link Response} received
   */
  private void getLocationPerformed(Request<Measurement> request, Response<Location> response) {
    Location l = response.getData();
    if (l == null) {
      return;
    }

    Location dbLoc = locHome.getByRemoteId(l.getRemoteId());
    if (dbLoc != null) {
      l.setLocalId(dbLoc.getLocalId());

      if (!l.equals(dbLoc)) {
        if (!locHome.update(l)) {
          Log.w(TAG, "update of location " + l + " failed");
        }
      }

    } else {
      locHome.add(l);
    }
  }