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From Jonathan Layes <j.coc...@layes.com>
Subject Re: sitemap design patterns - hybrid selector/matcher?
Date Mon, 10 Jun 2002 16:10:46 GMT
On Mon, Jun 10, 2002 at 11:35:58AM -0400, Vadim Gritsenko wrote:
> > From: Christian Haul [mailto:haul@dvs1.informatik.tu-darmstadt.de]
> > > > From: Christian Haul [mailto:haul@dvs1.informatik.tu-darmstadt.de]
> > > > > Nope, this is not a bug. Sitemap works this way, breaking
> execution
> > > > > on
> > > > > first serialize.
> > > >
> > > > Sure, but have a second look at the code: There's only one
> serialize.
> > >
> > > Yup, one serialize. It means every request will get through: match,
> > > generator, transformer, match, generator... Oops! Exception: can't
> have
> > > two generators.
> > 
> > Oh, haven't realized that the last match matches everything and then
> > two generators are used. But apart from using two generators, the
> > snippet should work, right? Like using a regex-matcher and matching
> > "[^ab]*.html"
> 
> Yes, if you make matcher patterns so they do not intersect, everything
> will be OK.

My first interpretation of the docs was much like Christian's - only
the first successful matcher at a given nest level will run.  But
further investigation and experimentation led me to conclude what 
Vadim pointed out:  the subpipeline will keep executing matchers
until a serializer is reached.

Sometimes this behaviour is convenient and sometimes it isn't. 
In the example I provided where I want a default, catch-all case
to apply to everything that hasn't matched earlier in the subpipeline,
it isn't convenient.  However, I don't think changing the behaviour 
of matchers is a good idea as it would seriously break existing 
sitemaps.

The default, catch-all case is where the selector model seems a
better fit.  However, selectors really weren't designed for 
pattern matching.  For starters, a new map isn't created with
selectors so extracting parts of the matched pattern doesn't
really work.  Christian, thanks for pointing out SwitchSelector 
in CVS, though.  That is the class from which I'd derive such a
pattern-matching selector if I decide it's a good idea.

Vadim, what is your opinion on dealing with this type of situation?


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