RFC: ClassGroupPattern

[Frank Koormann]

Hi,

* Bernhard Reiter <bernhard at intevation.de> [050126 16:20]:
> On Tue, Jan 25, 2005 at 06:45:48PM +0100, Frank Koormann wrote:
> > I just hacked in a new classification into Thuban I needed for a
> > specific task: Instead of a single value or a range (valid for numbers)
> > a regexp pattern can be applied (with re.match()). 
> > 
> > What do others think about such a classification feature? Do you need
> > this in real life applications? 
> 
> Yes, I think it can be useful.
> It might drag a lot of resources, but that is worth the trouble.

Might be. I havn't profiled so far if the re.match() is more expensive
than the full string comparison we have already in Thuban.
 
> > Any suggestions about how this Classification
> > could be generated by "Generate Class"? 
> 
> If you give one pattern, we could also define: 
> no string and the opposite of the pattern.
> That gives us three classes, not too bad.

Interesting. 

Thanks for your comments.

-- 
Frank Koormann                             <frank.koormann at intevation.de>
 Professional Service around Free Software       (http://intevation.net/)
 FreeGIS Project                                 (http://freegis.org/)
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