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Re: Inter-operating with Java lists


Per Bothner <per@bothner.com> wrote:
> Bhinderwala, Shoeb wrote:
> 
> > I have a list of Java objects in a Java list (e.g. java.util.ArrayList).
> > I have a scheme function that takes a Scheme list as a parameter.
> > How do I pass my Java list to the scheme function?
> 
> I checked in to CVS an enhancment to LList.makeList to let it
> take any java.util.List.  

Another way to do it is to just write a conversion routine from an
ArrayList to a scheme list:

    (define-namespace Iterator   "class:java.util.Iterator")
    (define-namespace Collection "class:java.util.Collection")

    (define (collection->list coll)
      (iterator->list (Collection:iterator coll)))

    (define (iterator->list iter)
      (let loop ((acc '()))
        (if (Iterator:hasNext iter) 
            (loop (cons (Iterator:next iter) acc))
            (reverse! acc))))

Kawa will generate very efficient code for these procedures.

Regards,
Chris Dean


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