Kotlin - 使用反射获取 static 函数

Question

I was using this piece of code to map all static functions of a Java class to stuff:

fun staticsFromClass(clazz: Class<*>): List<Something> = clazz.methods
        .filter { method -> Modifier.isStatic(method.modifiers) }
        .map { method ->
           //something
        }

but I found out it only works on Java code. It filters out companion object functions and singleton object functions. How can I fix it?

Answer 1

Actually, this code works for Kotlin code, but usually Kotlin code does not have any static members. You can acquire companion members with the following code:

fun companionMembersFromClass(clazz: KClass<*>): List<Something> {
    val members = clazz.companionObject?.members ?: emptyList()
    ...
}

Similarly, you can acquire the instance of the companion with: clazz.companionObjectInstance .

Alternatively, you can reference a companion class directly with eg: MyClass.Companion::class and then list its non-static members.