检索 Groovy 闭包/方法参数列表 [英] Retrieve Groovy Closure/Method parameters list

问题描述

我们如何通过参数数组以javascript风格动态检索groovy中的闭包/方法的参数列表

How do we retrieve the list of parameters of a closure/method in groovy dynamically, javascript style through the arguments array

例如说我想以这种方式记录一条消息

say for example that i want to log a message this way

def closure = {name,id ->
 log.debug "Executing method with params name:${} id:${id}"
}

或

void method (String name,String id) {
 log.debug "Executing method with params name:${} id:${id}"
}

我读过一次关于引用闭包参数列表的方法，但我不记得它并查看了 Closure 仅显示 getParametersType() 方法.至于方法，有一种方法可以调用一个方法作为一个闭包，然后我可以检索方法参数

I read once about a way to reference the list of parameters of a closure, but i have no recollection of that and looking at the groovy API for Closure reveals only getParametersType() method. As for the method, there is a way to call a method as a closure and then i can retrieve the method parameters

肯

推荐答案

你不会喜欢它(我希望做研究和回答不是我的坏事)，但是:

You won't like it (and I hope it's not my bad to do research and to answer), however:

没有 API 可以访问在 Groovy Closure 或 Java Method 中声明的参数列表.

There is no API to access the list of parameters declared in a Groovy Closure or in a Java Method.

我还查看了相关类型，包括(对于 Groovy)MetaClass、子类型和 org.codehaus.groovy.reflection 包中的类型, 和(对于 Java)java.lang.reflect 包中的类型.

I've also looked at related types, including (for Groovy) MetaClass, and sub-types, and types in the org.codehaus.groovy.reflection package, and (for Java) types in the java.lang.reflect package.

此外，我进行了广泛的 Google 搜索以追踪外星人.;-)

Furthermore, I did an extensive Google search to trace extraterrestrials. ;-)

如果我们需要一个可变长度的闭包或方法参数列表，我们可以使用 Object[] 数组、List 或 varargs作为参数:

If we need a variable-length list of closure or method arguments, we can use an Object[] array, a List, or varargs as parameters:

def closure = { id, Object... args ->
    println id
    args.each { println it }
}
closure.call(1, "foo", "bar")

好吧，这就是限制和选项！

Well, that's the limitations and options!

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