将多个注释与参数合并 [英] merge multiple annotations with parameters

问题描述

我在使用多个批注时遇到了一个问题，这些批注或多或少都说同一件事，但对不同的框架，我想将它们全部归为一个自定义批注.当前看起来像这样:

I have a problem with using multiple annotations that all say more or less the same thing but to different frameworks and I would like to group them all into one custom annotation. Currently it looks like this:

@Column(name = "bank_account_holder_name")
@XmlElement(name = "bank_account_holder_name")
@SerializedName("bank_account_holder_name")
@ApiModelProperty(name = "bank_account_holder_name", value = "The name of the recipient bank account holder")
public String bankAccountHolderName;

如您所见，它们都重复相同的String，我想将它们组合在一起，但是我还没有找到一种方法.

As you can see they all repeat the same String and I would like to combine them, but I have yet to find a way of doing so.

是否完全有可能做到这一点，还是我必须继续这样做还是更改/创建新框架?

Is it at all possible to do this, or do I have to either continue doing this or change/create a new framework?

推荐答案

答案是:可能不，这是不可能的(使用标准" java).

The answer is: probably no, this is not possible (using "standard" java).

您看到，没有 继承 用于批注，但仅是多重"继承，它可以使您表达:

You see, there is no inheritance for annotations, yet alone "multiple" inheritance which would allow you to express:

public @interface MultiAnnotiation extends Column, XmlElement, ...

最有可能的是，这些注释的工作方式如下:在运行时，相应的框架使用反射来检查某个对象是否具有.而且，如果找不到其"注释，则什么也不会发生.

And most likely, those annotations work like this: at runtime the corresponding frameworks uses reflection to check if a certain object has that annotation. And if it doesn't find "its" annotation, nothing happens.

因此，您将需要一种魔术"地将这些注释插入到您的类文件中的方法.

So you would need a way to "magically" insert those annotations into your class file.

归结为:当您编写自己的编译器并在Java之上发明某些东西时，您可以执行类似的操作.

Boiling down to: when you would write your own compiler, and invent something on top of java, then you could do something like that.

处理编译器插件附带的注释(意思是:在编译时处理的注释)时，情况可能会有所不同.也许您可以编写自己的自定义注释，然后触发相同编译时操作.

Things might be different when dealing with annotations that come with compiler-plugins (meaning: an annotation that is processed at compile time). Maybe you could write your own custom annotation then that triggers the same compile-time operations.

长话短说:所有这些听起来有趣，但高级，最有可能的是:不会生成健壮的，可用于生产的代码！

Long story short: all of this sounds interesting, but rather advanced, and most likely: not resulting in robust, production-worthy code!

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