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From "Oliver Fischer" <ple...@snafu.de>
Subject Re: [collections] Would like to contribute my RangeIterator
Date Fri, 03 May 2002 09:01:11 GMT
Sorry, the posted classes contain debug code...

Bye

Oliver

----- Original Message -----
From: "Oliver Fischer" <plexus@snafu.de>
To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org>
Sent: Friday, May 03, 2002 10:55 AM
Subject: Re: [collections] Would like to contribute my RangeIterator


> After the discussion about it, I decided to post the Rangeiterator.
> May you like it.
>
> Bye
>
> Oliver
>
>
> ----- Original Message -----
> From: "Jack, Paul" <pjack@sfaf.org>
> To: "'Jakarta Commons Developers List'"
> <commons-dev@jakarta.apache.org>
> Sent: Tuesday, April 30, 2002 7:07 PM
> Subject: RE: [collections] Would like to contribute my RangeIterator
>
>
> > And to use a RangeIterator over a collection that isn't sorted,
> > you'd probably create a sorted collection first:
> >
> >    new TreeSet(collection, comparator).subSet(first,
> last).iterator();
> >
> > seems like it does what RangeIterator does.
> >
> > -Paul
> >
> > -----Original Message-----
> > From: James Strachan [mailto:james_strachan@yahoo.co.uk]
> > Sent: Tuesday, April 30, 2002 1:00 AM
> > To: Jakarta Commons Developers List
> > Subject: Re: [collections] Would like to contribute my
RangeIterator
> >
> >
> > From: "Oliver Fischer" <plexus@snafu.de>
> > > Is there a PredicateIterator already?
> >
> > Actually its called FilterIterator right now.
> >
> > > Haven't seen it in the API doc
> > > for the collections? I think the FilterIterator is quite close
to
> it.
> > > The my RangeIterator will stop, if the right border is reached,
> while
> > > (?) the FilterIterator evaluates every object. Think about
> iterators
> > > which point to a huge amount of objects...
> >
> > Though that assumes that the underlying iterator returns objects
> sorted (in
> > the right ascending/descending order) that the left & right
> predicates are
> > is based on. This sounds a bit specific to me; maybe this should
be
> done
> > using an 'Index' class of some kind to mimic the sorting and range
> features.
> > For the general approach of filtering an iterator the existing
> Filterterator
> > seems fine which works on any Predicates and irrespective of
> sorting...
> >
> > Predicate predicate = new Predicate() {
> >     public boolean evaluate(Object object) {
> >         Foo foo = (Foo) object;
> >         return foo.getAge() > 12 and foo.getAge() < 67;
> >     }
> > }
> > return new FilterIterator( iterator, predicate );
> >
> > James
> >
> >
> > _________________________________________________________
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> >
> >
> > --
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> >
> >
>


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