Kotlin: using google-guava static methods as extensions

Can existing java static methods be used as extensions from a window?

Let's consider com.google.common.collect.Iterables.transform

. Now since I don't know how to deal with this, use the suggested method as an extension, I need to write something like:

import com.google.common.collect.Iterables.transform

public fun <F, T> Iterable<F>.transform(function: Function<in F, out T>) : Iterable<T> {
    return transform(this, function);
}

      

        
        
        
      

    

So, after that, I could use it with iterators:

Iterable<A> input;
Function<A, B> function;
Iterable<B> output = input.transform(function);

      

        
        
        
      

    

But I think self-disclosure declaration is unnecessary. How to skip this declaration?

Update

There are two main subqueries in my question:

• Can existing (static) methods be imported as extensions?

  No, this is not possible yet.

• How to reuse existing guava Function
  
  s eg. to transform

Iterable
  
  s?

  Instead, transform
  
  you should use an extension map
  
  as suggested in the answers. For reuse, Function
  
  you can use the extension like this:

public fun <T, R> Function<T, R>.asFun(): (T) -> R
    = { input -> apply(input) };