public ErrorStatsData getStats(String route, String cause) {
        Map<String, ErrorStatsData> map = routeMap.get(route);
        if (map == null) return null;
        return map.get(cause);
    }
public ErrorStatsData getStats ( String route , String cause ) { Map < String , ErrorStatsData > map = routeMap . get ( route ) ; if ( map == null ) return null ; return map . get ( cause ) ; }
@param route
@param cause
@return data structure for holding count information for a route and cause