On Dec 11, 12:27 pm, Keith Irwin <keith.ir...@gmail.com> wrote:
> Folks--
>
> I've got a class I can't change which has an abstract method I'd like
> to override using the proxy macro in Clojure.
>
> The class looks something like:
>
> public abstract class Foo {
>
> private Map stuff;
>
> private void initStuff() {
>
> stuff = new HashMap();
> stuff.put("a", new Object());
> addStuff(stuff);
> }
>
> protected void abstract addStuff(Map stuff);
> }
>
> Normally, you extend the above and implement the addStuff method.
> Works in Groovy as long as I explicitly state the void return type and
> the type of the parameters.
>
> In Clojure, I construct:
>
> (proxy [Foo] []
> (addStuff [stuff] (println "yay!")))
>
> But get an AbstractMethodError when I attempt to use the Foo class
> (calling a method which eventually calls addStuff).
>
> The docs suggest I can override a protected method class, but can't
> call other protected methods, which I think is fine, here.
>
> Is there something I'm missing?
>
> Keith
Given what you have written, the proxy function will return an
instance that extends Foo, implementing the addStuff method; it
doesn't modify the Foo class, nor provide you with a derived class.
If you want to create a derived class that's accessible from java,
you'll need to use something related to gen-class.
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