DTO 的父/子模型

发布于 2024-12-21 19:32:24 字数 923 浏览 2 评论 0原文

我不确定这种情况是否更多地与泛型相关，而不是DTO，但事情是这样的：

我有一个代表一个人的DTO 。人可以拥有其他人作为子，或者只是这些人的ResourceLink强>(s)。这意味着子级可以是以下 2 种类型之一：Person（DTO）或ResourceLink。它是什么类型是通过 queryParam 确定的，并因此在逻辑上通过随后的流程确定。我想仅使用 ONE 集合对象来表示它们，但不知道这样做的最佳方法。

这是我到目前为止所得到的：

public class PersonDTO<T> {

    @XmlElementWrapper(name = "children")
    @XmlElement(name = "child")
    List<T> children;
    // other stuff

}

使用这种方法，我需要根据 if...else 条件定义翻译类型。

早些时候，我有 2 个不同的集合，其中一个仍然是 NULL。我还考虑过在新的 DTO 中提取关系作为 ChildrenDTO （不确定这是否是一个好主意）

我想知道是否有针对这种情况的最佳实践，否则，如果可以根据条件声明 PersonDTO 或 PersonDTO。

提前致谢！

原文

I am not sure if this situation would more be related to generics than DTOs, but here it goes:

I have a DTO that represents a Person. A Person can have as children other Person(s) or just ResourceLink to those Person(s). This means that the child can be of either of the 2 types: Person (the DTO) or the ResourceLink. What type it would be, is determined through a queryParam and consequently logically through the flow follwed. I want to represent them using just ONE collection object and am not aware of the best way to do so.

Here is what I have so far:

public class PersonDTO<T> {

    @XmlElementWrapper(name = "children")
    @XmlElement(name = "child")
    List<T> children;
    // other stuff

}

With this approach, I need to define the translated type based on an if...else condition.

Earlier I had 2 different collections, one of which remained NULL. I also thought of extracting the relationship thing out in a new DTO as ChildrenDTO (not sure if that's a great idea)

I would like to know if there is a best practice for this situation, otherwise, if it is possible to declare a PersonDTO<PersonDTO> or PersonDTO<ResourceLink> depending on a condition.

Thanks in advance!

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月竹挽风 2024-12-28 19:32:24

我建议改为对 List 子项的元素使用第三种类型：

    public interface PersonResolver () {
          Person resolvePerson ();
    }

    public class Person implements PersonResolver {
          Person resolvePerson () { return this; }
    }

    public class ResourceLink implements PersonResolver {
          Person resolvePerson () {
               if (myLinkTargetType == TARGET_TYPE_PERSON)
                      { return (Person) myTarget; }
               return null;
          }
    }

I'd suggest instead, using a third type for the elements of List children:

    public interface PersonResolver () {
          Person resolvePerson ();
    }

    public class Person implements PersonResolver {
          Person resolvePerson () { return this; }
    }

    public class ResourceLink implements PersonResolver {
          Person resolvePerson () {
               if (myLinkTargetType == TARGET_TYPE_PERSON)
                      { return (Person) myTarget; }
               return null;
          }
    }

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