/**
   * @param placeNameServiceSet the set of PlaceNameService objects that PlaceNameLayer will render.
   * @throws IllegalArgumentException if {@link
   *     gov.nasa.worldwind.layers.placename.PlaceNameServiceSet} is null
   */
  public PlaceNameLayer(PlaceNameServiceSet placeNameServiceSet) {
    if (placeNameServiceSet == null) {
      String message = Logging.getMessage("nullValue.PlaceNameServiceSetIsNull");
      Logging.logger().fine(message);
      throw new IllegalArgumentException(message);
    }

    //
    this.placeNameServiceSet = placeNameServiceSet.deepCopy();
    for (int i = 0; i < this.placeNameServiceSet.getServiceCount(); i++) {
      // todo do this for long as well and pick min
      int calc1 =
          (int)
              (PlaceNameService.TILING_SECTOR.getDeltaLatDegrees()
                  / this.placeNameServiceSet
                      .getService(i)
                      .getTileDelta()
                      .getLatitude()
                      .getDegrees());
      int numLevels = (int) Math.log(calc1);
      navTiles.add(
          new NavigationTile(
              this.placeNameServiceSet.getService(i),
              PlaceNameService.TILING_SECTOR,
              numLevels,
              "top"));
    }

    if (!WorldWind.getMemoryCacheSet().containsCache(Tile.class.getName())) {
      long size = Configuration.getLongValue(AVKey.PLACENAME_LAYER_CACHE_SIZE, 2000000L);
      MemoryCache cache = new BasicMemoryCache((long) (0.85 * size), size);
      cache.setName("Placename Tiles");
      WorldWind.getMemoryCacheSet().addCache(Tile.class.getName(), cache);
    }
  }