如何在Lombok构建器中的构造函数之后运行代码 [英] How to run code after constructor in a Lombok builder

问题描述

我有一个类，我想使用Lombok.Builder，我需要预处理一些参数。这样的事情：

I have a class that I want to use Lombok.Builder and I need pre-process of some parameters. Something like this:

@Builder
public class Foo {
   public String val1;
   public int val2;
   public List<String> listValues;

   public void init(){
       // do some checks with the values.
   }
}

通常我会打电话给在NoArg构造函数上的init（），但是使用生成的构建器，我无法这样做。有没有办法让生成的构建器调用 init ？例如 build（）将生成如下代码：

normally I would just call init() on a NoArg constructor, but with the generated builder I'm unable to do so. Is there a way for this init be called by the generated builder? For example build() would generate a code like:

public Foo build() {
   Foo foo = Foo(params....)
   foo.init();
   return foo;
}

我知道我可以手动编码所有args 构造函数，Builder将通过它调用，我可以在那里调用 init 。

I'm aware that I can manually code the all args constructor, that the Builder will call through it and I can call init inside there.

但这是一个次优解决方案，因为我的类可能会偶尔添加新字段，这也意味着更改构造函数。

But that is a sub-optimal solution as my class will likely have new fields added every once in a while which would mean changing the constructor too.

推荐答案

在 Foo 中你可以手动添加一个构造函数，让它进行初始化，然后放入 @Builder 在构造函数上。我知道您已经知道这一点，但我认为这是正确的解决方案，您不会忘记添加参数，因为您确实想要使用构建器中的代码。

In Foo you could manually add a constructor, have that do the initialization, and put @Builder on the constructor. I know that you already know this, but I think it is the right solution, and you won't forget to add the parameter since you do want to use the code in the builder anyway.

披露：我是一名lombok开发者。

Disclosure: I am a lombok developer.

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