docs: public static Polygon buffer(Geometry geometry,
  			SpatialReference spatialReference, double distance) {
  		double bufferDistance = distance;
  
  		OperatorBuffer op = (OperatorBuffer) factory
  				.getOperator(Operator.Type.Buffer);
  		Geometry result = op.execute(geometry, spatialReference,
  				bufferDistance, null);
  		return (Polygon) result;
  	}