List<DishDto> dishDtoList =list.stream().map((item) -> { DishDto dishDto = new DishDto(); BeanUtils.copyProperties(item, dishDto); Long categoryId = item.getCategoryId();//分类id //根据id查询分类对象 Category category = categoryService.getById(categoryId); if (category != null) { String categoryName = category.getName(); dishDto.setCategoryName(categoryName); } Long dishId = item.getId();//当前菜品的id LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>(); lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId); List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper); dishDto.setFlavors(dishFlavorList); return dishDto; }).collect(Collectors.toList());

这段代码使用了 Java 8 中的 Stream API 对传入的菜品列表 list 进行遍历，并根据每个菜品构建一个 DishDto 对象，最终将所有 DishDto 对象收集到一个列表中。

具体来说，代码中的 map() 方法接收一个 Function 对象，用于将 list 中的每个菜品对象转化为一个 DishDto 对象。在转化的过程中，使用 BeanUtils.copyProperties() 方法将菜品对象的属性值复制到 DishDto 对象中。

接着，代码查询了当前菜品的分类信息和口味信息，并将它们设置到 DishDto 对象中。具体来说：

- 获取当前菜品的分类 ID，根据该 ID 查询分类对象 Category；
- 如果查询到了分类对象，将分类名称设置到 DishDto 对象中；
- 获取当前菜品的 ID，根据该 ID 查询所有关联的口味对象 DishFlavor；
- 将查询到的口味列表设置到 DishDto 对象中。

最终，使用 collect() 方法将所有 DishDto 对象收集到一个列表中，并将该列表作为方法的返回值。

相关问题

List<SchemaRowRule> userRowRuleList = schemaRowRuleList.stream() .filter(schemaRowRuleEo -> { List<String> userList = JSONArray.parseArray(schemaRowRuleEo.getRowPermissionUserList(), String.class); List<String> orgList = JSONArray.parseArray(schemaRowRuleEo.getRowPermissionOrgList(), String.class); return userList.contains(userUid) || orgList.contains(orgCode); }) .map(schemaRowRuleEo -> { SchemaRowRule schemaRowRule = SchemaRowRule.builder().build(); BeanUtils.copyProperties(schemaRowRuleEo, schemaRowRule); return schemaRowRule; }) .collect(Collectors.toList()); List<SchemaColumnRule> userColumnRuleList = schemaColumnRuleList.stream() .filter(rule -> { if (StringUtils.isNotEmpty(rule.getColumnPermissionUserList())) { List<String> userList = JSONArray.parseArray(rule.getColumnPermissionUserList(), String.class); return userList.contains(userUid); } else if (StringUtils.isNotEmpty(rule.getColumnPermissionOrgList())) { List<String> orgList = JSONArray.parseArray(rule.getColumnPermissionOrgList(), String.class); return orgList.contains(orgCode); } return false; }) .map(rule -> { SchemaColumnRule columnRule = new SchemaColumnRule(); BeanUtils.copyProperties(rule, columnRule); return columnRule; }) .collect(Collectors.toList());代码优化

可以将一些重复的代码提前抽象出来，例如解析字符串为列表的部分可以提取为一个方法，同时可以使用方法引用的方式替换Lambda表达式，代码如下：

private <T> List<T> copyProperties(List<T> sourceList, Supplier<T> targetSupplier) {
    return sourceList.stream()
            .map(source -> {
                T target = targetSupplier.get();
                BeanUtils.copyProperties(source, target);
                return target;
            })
            .collect(Collectors.toList());
}

...

List<String> userList = parseJsonArray(schemaRowRuleEo.getRowPermissionUserList());
List<String> orgList = parseJsonArray(schemaRowRuleEo.getRowPermissionOrgList());
List<SchemaRowRule> userRowRuleList = schemaRowRuleList.stream()
        .filter(schemaRowRuleEo -> userList.contains(userUid) || orgList.contains(orgCode))
        .collect(Collectors.toList());
List<SchemaColumnRule> userColumnRuleList = schemaColumnRuleList.stream()
        .filter(rule -> {
            List<String> userList = parseJsonArray(rule.getColumnPermissionUserList());
            List<String> orgList = parseJsonArray(rule.getColumnPermissionOrgList());
            return userList.contains(userUid) || orgList.contains(orgCode);
        })
        .collect(Collectors.toList());
List<SchemaRowRule> copiedRowRuleList = copyProperties(userRowRuleList, SchemaRowRule::new);
List<SchemaColumnRule> copiedColumnRuleList = copyProperties(userColumnRuleList, SchemaColumnRule::new);

...

private List<String> parseJsonArray(String jsonArray) {
    if (StringUtils.isNotEmpty(jsonArray)) {
        return JSONArray.parseArray(jsonArray, String.class);
    }
    return Collections.emptyList();
}

List<DataPermissionSchemaEo> dataPermissionSchemaEoList = comDataComponent.getDataPermissionSchemaList(); List<SchemaRowRuleEo> schemaRowRuleList = comDataComponent.getSchemaRowRuleList(); List<SchemaColumnRuleEo> schemaColumnRuleList = comDataComponent.getSchemaColumnRuleList(); //设置行权限 根据用户id和用户组织去获取 List<SchemaRowRule> userRowRuleList = schemaRowRuleList.stream() .filter(schemaRowRuleEo -> { List<String> userList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionUserList(), String.class); List<String> orgList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionOrgList(), String.class); return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD); }) .map(schemaRowRuleEo -> { SchemaRowRule schemaRowRule = new SchemaRowRule(); BeanUtils.copyProperties(schemaRowRuleEo, schemaRowRule); return schemaRowRule; }) .collect(Collectors.toList());List<SchemaColumnRule> userColumnRuleList = schemaColumnRuleList.stream() .filter(rule -> { List<String> userList = Optional.ofNullable(rule.getColumnPermissionUserList()) .map(userListStr -> JSONObject.parseArray(userListStr, String.class)) .orElse(Collections.emptyList()); List<String> orgList = Optional.ofNullable(rule.getColumnPermissionOrgList()) .map(orgListStr -> JSONObject.parseArray(orgListStr, String.class)) .orElse(Collections.emptyList()); return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD); }) .map(rule -> { SchemaColumnRule columnRule = new SchemaColumnRule(); BeanUtils.copyProperties(rule, columnRule); return columnRule; }) .collect(Collectors.toList()); List<DataPermissionSchema> dataPermissionSchemaList = dataPermissionSchemaEoList.stream().map(dataPermissionSchemaEo -> { List<SchemaRowRule> schemaRowRules = userRowRuleList.stream() .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode()) && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode())) .collect(Collectors.toList()); List<SchemaColumnRule> schemaColumnRules = userColumnRuleList.stream() .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode()) && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode())) .collect(Collectors.toList()); if(!schemaRowRules.isEmpty() || !schemaColumnRules.isEmpty()) { DataPermissionSchema dataPermissionSchema = new DataPermissionSchema(); dataPermissionSchema.setDatabaseCode(dataPermissionSchemaEo.getDatabaseCode()); dataPermissionSchema.setSchemaCode(dataPermissionSchemaEo.getSchemaCode()); dataPermissionSchema.setSchemaRowRuleList(schemaRowRules); dataPermissionSchema.setSchemaColumnRuleList(schemaColumnRules); return dataPermissionSchema; } return null; }).filter(Objects::nonNull).collect(Collectors.toList());把这段代码改造成每个用户拥有的行权限和列权限

可以将该代码封装成一个方法，接收用户ID和组织代码作为参数，返回该用户拥有的行权限和列权限，代码如下：

public List<DataPermissionSchema> getUserDataPermissionSchema(String userUid, String orgCode) {
    List<DataPermissionSchemaEo> dataPermissionSchemaEoList = comDataComponent.getDataPermissionSchemaList();
    List<SchemaRowRuleEo> schemaRowRuleList = comDataComponent.getSchemaRowRuleList();
    List<SchemaColumnRuleEo> schemaColumnRuleList = comDataComponent.getSchemaColumnRuleList();

    // 获取用户行权限
    List<SchemaRowRule> userRowRuleList = schemaRowRuleList.stream()
            .filter(schemaRowRuleEo -> {
                List<String> userList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionUserList(), String.class);
                List<String> orgList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionOrgList(), String.class);
                return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD);
            })
            .map(schemaRowRuleEo -> {
                SchemaRowRule schemaRowRule = new SchemaRowRule();
                BeanUtils.copyProperties(schemaRowRuleEo, schemaRowRule);
                return schemaRowRule;
            })
            .collect(Collectors.toList());

    // 获取用户列权限
    List<SchemaColumnRule> userColumnRuleList = schemaColumnRuleList.stream()
            .filter(rule -> {
                List<String> userList = Optional.ofNullable(rule.getColumnPermissionUserList())
                        .map(userListStr -> JSONObject.parseArray(userListStr, String.class))
                        .orElse(Collections.emptyList());
                List<String> orgList = Optional.ofNullable(rule.getColumnPermissionOrgList())
                        .map(orgListStr -> JSONObject.parseArray(orgListStr, String.class))
                        .orElse(Collections.emptyList());
                return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD);
            })
            .map(rule -> {
                SchemaColumnRule columnRule = new SchemaColumnRule();
                BeanUtils.copyProperties(rule, columnRule);
                return columnRule;
            })
            .collect(Collectors.toList());

    // 获取用户权限所在的数据权限模板
    List<DataPermissionSchema> dataPermissionSchemaList = dataPermissionSchemaEoList.stream().map(dataPermissionSchemaEo -> {
        List<SchemaRowRule> schemaRowRules = userRowRuleList.stream()
                .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode())
                        && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode()))
                .collect(Collectors.toList());
        List<SchemaColumnRule> schemaColumnRules = userColumnRuleList.stream()
                .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode())
                        && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode()))
                .collect(Collectors.toList());
        if(!schemaRowRules.isEmpty() || !schemaColumnRules.isEmpty()) {
            DataPermissionSchema dataPermissionSchema = new DataPermissionSchema();
            dataPermissionSchema.setDatabaseCode(dataPermissionSchemaEo.getDatabaseCode());
            dataPermissionSchema.setSchemaCode(dataPermissionSchemaEo.getSchemaCode());
            dataPermissionSchema.setSchemaRowRuleList(schemaRowRules);
            dataPermissionSchema.setSchemaColumnRuleList(schemaColumnRules);
            return dataPermissionSchema;
        }
        return null;
    }).filter(Objects::nonNull).collect(Collectors.toList());

    return dataPermissionSchemaList;
}