生成等于使用注释/哈希code /的toString [英] Generating equals / hashcode / toString using annotation

问题描述

我相信我通过确定哪些领域应该是散/平等测试的一部分读的地方（使用APT）的人产生在编译时间等于/哈希code /的toString方法。我找不到像在网络上的任何东西（我可能是在做梦？）...

I believe I read somewhere people generating equals / hashcode / toString methods during compile time (using APT) by identifying which fields should be part of the hash / equality test. I couldn't find anything like that on the web (I might have dreamed it ?) ...

这可以这样做：

public class Person {
  @Id @GeneratedValue private Integer id;

  @Identity private String firstName, lastName;
  @Identity private Date dateOfBirth;

  //...
}

有关实体（所以我们要exlude某些领域，如ID）。

For an entity (so we want to exlude some fields, like the id).

或者像斯卡拉案例类即值对象：

Or like a scala case class i.e a value object :

@ValueObject
public class Color {
  private int red, green, blue;
}

不仅是文件变得更容易阅读和书写，而且还有助于确保所有的属性都等于/哈希code的一部分（如果你添加另一个属性以后，没有相应地更新方法）。

Not only the file becomes more readable and easier to write, but it also helps ensuring that all the attributes are part of the equals / hashcode (in case you add another attribute later on, without updating the methods accordingly).

我听说APT是不能很好地支持IDE，但我不认为这是一个重大问题。毕竟，测试主要是由持续集成服务器上运行。

I heard APT isn't very well supported in IDE but I wouldn't see that as a major issue. After all, tests are mainly run by continuous integration servers.

如果这个任何想法已经做了，如果没有，为什么？
谢谢

Any idea if this has been done already and if not why ? Thanks

推荐答案

我使用项目龙目岛这一点。

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