code: public Class<? extends com.vividsolutions.jts.geom.Geometry> toInternal(LayerType layerType) {
  		switch (layerType) {
  			case GEOMETRY:
  				return com.vividsolutions.jts.geom.Geometry.class;
  			case LINESTRING:
  				return LineString.class;
  			case MULTILINESTRING:
  				return MultiLineString.class;
  			case POINT:
  				return Point.class;
  			case MULTIPOINT:
  				return MultiPoint.class;
  			case POLYGON:
  				return Polygon.class;
  			case MULTIPOLYGON:
  				return MultiPolygon.class;
  			case RASTER:
  				return null;
  			default:
  				throw new IllegalStateException("Don't know how to handle layer type " + layerType);
  		}
  	}
docs: Convert a layer type to a geometry class.
  
  @param layerType
  layer type
  @return JTS class