question: returns a stream of route s matching the initial criteria concode_field_sep Set<Route<? extends RouteSource,? extends RouteDestination>> routes concode_field_sep int routesCount concode_elem_sep String toString
target: Stream < Route < Source , Destination >> function ( Class < Source > arg0 , Class < Destination > arg1 ) { Stream loc0 = routes . stream ( ) . filter ( r -> arg0 . isAssignableFrom ( r . getRouteSource ( ) . getClass ( ) ) ) . filter ( r -> arg1 . isAssignableFrom ( r . getRouteDesitnation ( ) . getClass ( ) ) ) ; return loc0 ; }