Thanks! So you mean like this (assuming some function elt->event):
(defn seq->event-stream [input-seq]
(let [remaining (atom input-seq)]
(proxy [EventStream] []
(next [] (let [current (first @remaining)]
(swap! remaining rest)
(elt->event current)))
(hasNext [] (not (empty? @remaining))))))
2013/2/14 Ulises <[email protected]>
> How about having your methods access an atom provided in a closure like
> it's done here:
> http://kotka.de/blog/2010/03/proxy_gen-class_little_brother.html
>
> U
>
>
> On 14 February 2013 13:58, Joachim De Beule <[email protected]>wrote:
>
>> Hi All,
>>
>> I want to turn a clojure sequence into an 'EventStream' java interface in
>> clojure (see
>> http://opennlp.apache.org/documentation/1.5.2-incubating/apidocs/opennlp-maxent/index.html).
>> Basically this is an object that implements next() and hasNext() methods.
>>
>> I know this can be done with proxy:
>>
>> (proxy [EventStream] []
>> (hasNext [] ...)
>> (next [] (Event. ...) ...))
>>
>> What I am not sure about is how to deal with state. More precisely, the
>> object returned by the above call to proxy obviously must somehow keep a
>> pointer to the current position in the input sequence and increment the
>> index after a call to next() etc.
>>
>> Any ideas on how to best do something like this?
>>
>> Thanks a lot!
>> Joachim.
>>
>>
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