Visualize GeoPackage data on a Lightspeed map

//First create the model
ILcdModelDecoder decoder =
    new TLcdCompositeModelDecoder(TLcdServiceLoader.getInstance(ILcdModelDecoder.class));
ILcdModel model = decoder.decode("Data/GeoPackage/states.gpkg");

//Create a layer for the model
ILspLayer layer = createGeoPackageLayer(model);

//Add the layer to the Lightspeed view (an ILspView)
view.addLayer(layer);

/**
 * A GeoPackage file can contain:
 * <ul>
 *   <li>one or more vector data sets</li>
 *   <li>one or more raster data sets</li>
 *   <li>one or more elevation data sets</li>
 *   <li>a mix of the above</li>
 * </ul>
 * This method can deal with all those scenarios
 */
static ILspLayer createGeoPackageLayer(ILcdModel model) {
  //The model decoder returns a model tree node when the file contains multiple data sets
  //The node itself is just an empty container. We create an empty layer node for that container.
  //Then we loop over the child models (=the actual data), and create layers for those as well
  if (model instanceof ILcdModelContainer) {
    TLspLayerTreeNode node = new TLspLayerTreeNode(model);
    for (int i = 0; i < ((ILcdModelContainer) model).modelCount(); i++) {
      ILcdModel childModel = ((ILcdModelContainer) model).getModel(i);
      //Use recursion to create layers for the child models
      node.addLayer(createGeoPackageLayer(childModel));
    }
    return node;
  } else if (model.getModelDescriptor() instanceof TLcdGeoPackageModelDescriptor) {
    //See the class javadoc of TLcdGeoPackageModelDescriptor
    if (model.getModelDescriptor() instanceof ILcdEarthModelDescriptor || model.getModelDescriptor() instanceof ILcdImageModelDescriptor) {
      //This is a model containing raster or elevation data
      return TLspRasterLayerBuilder.newBuilder()
                                   .model(model)
                                   .build();
    } else if (model.getModelDescriptor() instanceof ILcdDataModelDescriptor) {
      //This is a model containing vector data
      return TLspShapeLayerBuilder.newBuilder()
                                  .model(model)
                                  .build();
    }
  }
  throw new IllegalArgumentException("Cannot create layer for model " + model);
}