Clojure to Java Interop

Question

I am trying to get javafx2 working with Clojure - In implementing an abstract class such as DoubleBinding, I am unsure what the equivalent of super.bind(moo) is in Clojure. The class I am implementing can be found here: http://docs.oracle.com/javafx/2/api/index.html.

(def moo (ObservableDoubleValue. ...))
(def foo (proxy [DoubleBinding] []
 (computeValue []
 (Math/sqrt (.getValue moo)))))
final ObservableDoubleValue moo = ...; 
DoubleBinding foo = new DoubleBinding() {
 {
 super.bind(moo);
 }
 @Override
 protected double computeValue() {
 return Math.sqrt(moo.getValue());
 }
 };

Answer 1

According to proxy documentation, methods in proxy has no access to super... I would recommend you to generate class using gen-class and use it. You can access to super's methods if you'll expose them with :exposes-methods directive. Something, like:

(gen-class :name MyDoubleBinding
 :extends DoubleBinding
 :exposes-methods {bind my-bind}
 ....
 )

and then call -my-bind from your constructor...

Please, check documentation about class generation on Clojure's site for more details on gen-class

• ivant: What about proxy-super?
• ChrisR: I have attempted to use proxy-super, however from what I have tested and read, it must be called from inside a method of the proxy. I have been testing gen-class and am unable to call .bindSuper in the post-init constructor, but still I try - it is very slow going since gen-class needs recompilation with each change.