Java获取编译时安全方法名称 [英] Java get compile-time safe method name

问题描述

在使用反射类和注释时，我发现没有明确的方法以编译时安全的方式引用方法名称.我真正想要的是能够在注释中引用一个方法.可能看起来像:

@CallAfter(method=Foo.class.foo())void Bar() { ... }

目前你只能用字符串来做这件事，这在编译时是不安全的.这是一个问题，因为它破坏了 Java 的静态类型.我找到的唯一解决方案类似于下面的内容.然而，这仍然无助于在注释中引用方法.:(

public static String methodName = null;公共静态无效主(字符串 [] args){//.foo() 是编译时安全的loadMethodName(IFoo.class).foo();System.out.println(methodName);}公共静态<T>T loadMethodName(Class mock) {返回 (T) Proxy.newProxyInstance(mock.getClassLoader(), new Class[] { mock },(对象，方法，参数)->{methodName = method.getName();返回空；});}公共接口 IFoo {对象 foo();}

有没有人对此有任何想法、意见或解决方案?

解决方案

我编写了一个 AnnotationProcessor 可以提供编译安全的方法引用.

While working with the reflection class and annotations I have found that there is no clear way to reference a method name in a compile-time safe way. What I really want is to be able to reference a method within an annotation. Might look something like:

@CallAfter(method=Foo.class.foo())
void Bar() { ... }

At the moment you can only do this with strings, which is not compile time safe.. This is a problem because it undermines Java being statically typed. The only solution I have found is something like what is below. However this still does not help with referencing a method in an annotation. :(

public static String methodName = null;

public static void main(String[] args) {

    // .foo() is compile-time safe
    loadMethodName(IFoo.class).foo();
    System.out.println(methodName);
}

public static <T> T loadMethodName(Class<T> mock) {
    return (T) Proxy.newProxyInstance(mock.getClassLoader(), new Class[] { mock }, 
    (obj, method, args) -> {
        methodName = method.getName();
        return null;
    });
}

public interface IFoo {
    Object foo();
}

Does anyone have any thoughts, comments, or a solution to this?

解决方案

I write an AnnotationProcessor that can provide a compile-safe method reference. See it on github

It will give a compile error if the referenced method not exists.

And it works in eclipse, see the snapshot.

这篇关于Java获取编译时安全方法名称的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！