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From "Peter Reilly" <peter.kitt.rei...@gmail.com>
Subject Re: AW: AW: how to access/iterate id in <script>
Date Fri, 05 Jan 2007 22:30:45 GMT
On 1/4/07, Steve Loughran <stevel@apache.org> wrote:
> Jan.Materne@rzf.fin-nrw.de wrote:
>
> >> 2)
> >> The java api of some types in ant were not really designed for
> >> ease of use.
> >
> > It's much easier to use <path> instead of <fileset>, e.g.
> >
> > Compare the execute()-implementation between [1] and [2].
> >
> >
>
> ahh, but as of ant 1.7 everything is a resource, which is something you
> can iterate over. If you store everthing as resouce collections, you
> just get an iterator() and let the tasks sort the details out for
> themselves:
>
> http://antbook.cvs.sourceforge.net/antbook/examples/sections/extending/ch17_tasks/filesize/first/src/org/antbook/tasks/filesize/ResourceSizeTask.java?view=markup
>
> the best bit, filesets have an iterator() method too, and
>   class DirSet extends AbstractFileSet implements ResourceCollection
>
> so if you get a dirset, you can call iterator() and get it to do all the
> heavy lifting.
>
> Summary: use the resource collection APIs. If there is one limitation,
> it is that even though the ResourceCollection Types implement
> iterator(), they cannot implement the java.lang.Iterable interface to
> say "use us in foreach()", because of course that is java5+ only. This

I think that if we say that ant needs to be compiled with java5, we
can make use of the Iterable interface, while still allowing ant
to be used in java1.3 and java1.4 env.

This would make script intergration much nicer.


Peter


> stops you going
>
>   for(File d:dirset) {
>         ...
>   }
>
> -steve
>
>
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