代码重构（Code Refactoring）能自动化吗？怎么优化代码结构

// 重构前：职责混杂的God Class
publicclassOrderProcessor{
    privateLogger logger =LoggerFactory.getLogger(OrderProcessor.class);

    publicvoidprocess(Order order){
        // 校验逻辑混在一起
        if(order.getAmount()<=0){
            thrownewIllegalArgumentException("订单金额必须大于0");
        }
        if(order.getUserId()==null){
            thrownewIllegalArgumentException("用户ID不能为空");
        }
        if(order.getItems().isEmpty()){
            thrownewIllegalArgumentException("订单商品不能为空");
        }

        // 格式转换逻辑
        String json =String.format("{\"orderId\":\"%s\",\"amount\":%s,\"userId\":\"%s\"}",
                                   order.getId(), order.getAmount(), order.getUserId());

        // 日志记录逻辑
        logger.info("开始处理订单: "+ json);

        // 实际处理逻辑
        saveToDatabase(order);

        logger.info("订单处理完成: "+ order.getId());
    }

    privatevoidsaveToDatabase(Order order){
        // 数据库操作
    }
}

// 重构后：职责分离，各司其职
publicclassOrderProcessor{
    privatefinalOrderValidator validator;
    privatefinalOrderLogger orderLogger;
    privatefinalOrderRepository repository;

    publicOrderProcessor(OrderValidator validator,
                         OrderLogger orderLogger,
                         OrderRepository repository){
        this.validator = validator;
        this.orderLogger = orderLogger;
        this.repository = repository;
    }

    publicvoidprocess(Order order){
        validator.validate(order);
        orderLogger.logProcessing(order);
        repository.save(order);
        orderLogger.logCompleted(order);
    }
}

// 校验职责独立出来
publicclassOrderValidator{
    publicvoidvalidate(Order order){
        if(order.getAmount()<=0){
            thrownewIllegalArgumentException("订单金额必须大于0");
        }
        if(order.getUserId()==null){
            thrownewIllegalArgumentException("用户ID不能为空");
        }
        if(order.getItems().isEmpty()){
            thrownewIllegalArgumentException("订单商品不能为空");
        }
    }
}

// 日志职责独立出来
publicclassOrderLogger{
    privatefinalLogger logger =LoggerFactory.getLogger(OrderLogger.class);
    privatefinalObjectMapper objectMapper =newObjectMapper();

    publicvoidlogProcessing(Order order){
        try{
            String json = objectMapper.writeValueAsString(order);
            logger.info("开始处理订单: {}", json);
        }catch(JsonProcessingException e){
            logger.error("订单序列化失败", e);
        }
    }

    publicvoidlogCompleted(Order order){
        logger.info("订单处理完成: {}", order.getId());
    }
}

// 重构前：复杂的条件判断，圈复杂度很高
publicclassActivityRuleChecker{
    publicbooleancheck(Activity activity,User user){
        if(activity.getStartTime().isAfter(LocalDateTime.now())){
            returnfalse;
        }
        if(activity.getEndTime().isBefore(LocalDateTime.now())){
            returnfalse;
        }
        if(activity.getStock()<=0){
            returnfalse;
        }
        if(user.getLevel()< activity.getRequiredLevel()){
            returnfalse;
        }
        if(!activity.getAllowedRegions().contains(user.getRegion())){
            returnfalse;
        }
        // 可能还有十几个判断条件...
        returntrue;
    }
}

// 重构后：使用策略模式，每个规则独立维护
publicinterfaceActivityRule{
    booleancheck(Activity activity,User user);
    StringgetFailureReason();
}

publicclassTimeRuleimplementsActivityRule{
    @Override
    publicbooleancheck(Activity activity,User user){
        LocalDateTime now =LocalDateTime.now();
        return!activity.getStartTime().isAfter(now)
        &&!activity.getEndTime().isBefore(now);
    }

    @Override
    publicStringgetFailureReason(){
        return"活动不在有效时间范围内";
    }
}

publicclassStockRuleimplementsActivityRule{
    @Override
    publicbooleancheck(Activity activity,User user){
        return activity.getStock()>0;
    }

    @Override
    publicStringgetFailureReason(){
        return"活动库存不足";
    }
}

publicclassUserLevelRuleimplementsActivityRule{
    @Override
    publicbooleancheck(Activity activity,User user){
        return user.getLevel()>= activity.getRequiredLevel();
    }

    @Override
    publicStringgetFailureReason(){
        return"用户等级不满足活动要求";
    }
}

// 规则引擎负责组织规则执行
publicclassActivityRuleEngine{
    privatefinalList<ActivityRule> rules;

    publicActivityRuleEngine(List<ActivityRule> rules){
        this.rules = rules;
    }

    publicCheckResultcheckAll(Activity activity,User user){
        for(ActivityRule rule : rules){
            if(!rule.check(activity, user)){
                returnCheckResult.fail(rule.getFailureReason());
            }
        }
        returnCheckResult.success();
    }
}