[jts-devel] Re: [postgis-devel] Possible Bug in isvalid()

[strk at refractions.net]

Maybe the "inner" classes facing these kind of errors should
throw a ValidityException instead so that the IsValid class 
could catch them ...

--strk;

On Thu, Apr 07, 2005 at 11:57:30AM +0200, Markus Schaber wrote:
> Hi,
> 
> (Added X-Post to JTS Developers list.)
> 
> Markus Schaber schrieb:
> > I just tried to apply my isvalid constraint to our raw data tables, and
> > got the following error message on one of them:
> > 
> > NOTICE:  AssertionFailedException: Unable to find a hole point not a
> > vertex of the shell
> > ERROR:  GEOS isvalid() threw an error!
> > 
> > This sounds rather strange to me. IMHO, it should not be possible to
> > make isvalid() throw an error by feeding it an invalid geometry.
> >
> > I'll try to track down which geometries cause this error message...
> 
> I now got a simple example:
> 
> > gisblau=# select isvalid('MULTIPOLYGON(((0 0, 10 10, 10 0, 0 0),(5 5, 5 0, 10 5, 5 5)))');
> > NOTICE:  AssertionFailedException: Unable to find a hole point not a vertex of the shell
> > ERROR:  GEOS isvalid() threw an error!
> 
> The attached small java program triggers this error on my machine
> against jts-1.6.jar.
> 
> HTH,
> Markus


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