Java排序上下移

    final  Integer DOWN = 1;
    final  Integer UP = -1;


    @Override
    public List orderHandler(Long id, Integer downOrUp){

        SysRouter current = new SysRouter();
        current.setId(id);

        current.setStatus(1);
        current = queryOne(current);

        if(Objects.isNull(current)){
            return queryRouter();
        }
        SysRouter neighbour = new SysRouter();
        neighbour.setParentId(current.getParentId());

        if(Objects.equals(downOrUp,DOWN)){

            neighbour.setOrderNum(current.getOrderNum()+DOWN);
            SysRouter sysRouter = queryOne(neighbour);
            if(Objects.nonNull(sysRouter )){
                sysRouter.setOrderNum(current.getOrderNum());
                update(sysRouter);
            }
            current.setOrderNum(neighbour.getOrderNum());
        }else {
            if(current.getOrderNum()-1<=0){
                return queryRouter();
            }

            neighbour.setOrderNum((current.getOrderNum()+UP));

            SysRouter sysRouter = queryOne(neighbour);
            if(Objects.nonNull(sysRouter )) {
                sysRouter.setOrderNum(current.getOrderNum());
                update(sysRouter);
            }
            current.setOrderNum(neighbour.getOrderNum());

        }

        update(current);

        return queryRouter();
    }