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());
     }
 };

Alex Ott · Accepted Answer · 2012-07-27 05:46:30Z

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

answered Jul 27, 2012 at 5:46

Alex Ott

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2 Comments

ivant Over a year ago

What about proxy-super?

ChrisR Over a year ago

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.

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