question: public TopNMetric ( TopNMetricType type , String previousStop , SortDirection order ) { this ( type , previousStop ) ; if ( order == SortDirection . ASC ) { this . type = TopNMetricType . INVERTED ; this . nested = Optional . of ( new TopNMetric ( type , previousStop ) ) ; this . previousStop = Optional . empty ( ) ; } }
target:  Constructs a sort of the given type with a starting point and explicitly specifies the order (ascending or descending).