java vavr map从函数if语句返回

Question

我有密码

private static Validation<ConstraintViolation, List<Person>> validatePersonDetail(
        List<PersonDetailRequest> personRequest) {
    
    for (PersonRequest request:personRequest) {
        
        if (isNull(request.getName())) {
            return invalid(new ConstraintViolation("name", "name cannot be empty"));
        }
        ..
        // more validations
        
        // build object
        Person.builder().name(request.getName()).build();
    }
    return valid([PERSON_LIST]);
}

我想返回人员列表，但不确定如何使用 Vavr。我不能使用验证组合，因为它包含嵌套对象的嵌套验证

Answer 1

假设当列表通过所有验证时，您只是构建Person， 那么map就是你所需要的：

private static Validation<ConstraintViolation, List<Person>> validatePersonDetail(
        List<PersonRequest> personRequest) {

    for (PersonRequest request:personRequest) {

        if (isNull(request.getName())) {
            return invalid(new ConstraintViolation("name", "name cannot be empty"));
        }
        // more validations

    }
    return valid(personRequest.map(request->Person.builder().name(request.getName()).build()));
}

Answer 2

我会推荐这样的东西。从validatePersonDetail 返回错误列表并检查它是否为空或为空，如果为空则继续执行：

private void mainExecution() {
    Validation<ConstraintViolation> validationErrors = validatePersonDetail(personRequest);
    if(validatePersonDetail().isEmpty) {
        return valid([PERSON_LIST]);
    } else {
        throw new ValidationFailedException(validationErrors);
    }
}

private static Validation<ConstraintViolation> validatePersonDetail(
            List<PersonDetailRequest> personRequest) {
    Validation<ConstraintViolation> validations = new ArrayList<>();
    for (PersonRequest request:personRequest) {
        if (isNull(request.getName())) {
            return validations.add(new ConstraintViolation("name", "name cannot be empty"));
        }
        ..
        // more validations
    }
    return validations;
}