Please, see my comment at the JIRA:
http://jira.codehaus.org/browse/GEOT-739
There're places in GeoTools were a SRID is already treated
as a simple int, but then it's always left blank (0 or -1).
So, until we decide to change it to a String SRID like "EPSG:3003",
we may leave it as an int but, at least, we may see it's set...
Bye
Paolo Rizzi
> -----Messaggio originale-----
> Da: Martin Desruisseaux [mailto:[EMAIL PROTECTED]
> Inviato: mercoledì 26 ottobre 2005 2.37
> A: "P.Rizzi Ag.Mobilità Ambiente"
> Cc: GeoTools-devel (E-mail)
> Oggetto: Re: [Geotools-devel] About toSRID()
>
>
> P.Rizzi Ag.Mobilità Ambiente a écrit :
> > In fact I looked into the GeoTools code and find no easy
> way of getting the
> > SRID from a CoordinateReferenceSystem. Sadly this is
> something that happens
> > often with GeoTools...
> >
> > I wrote a utility class to get the SRID from a
> CoordinateReferenceSystem,
> > but I'm not sure if the way I did it is the best one,
> neither I know if
> > there're better ways.
>
> An utility class will probably be helpfull (we will have to
> decide where
> to put it). But one issue to solve first is: what SRID is
> exactly? It is
> just an integer, and unfortunatly the integer meaning depends on the
> authority. EPSG has its own set of numerical codes; an other
> authority
> will have a different set of numerical codes. Unfortunatly
> there is no
> way (as far as I know) to determine which authority a
> 'getSRID()' method
> use.
>
> A possible approach is to decide that the integer returned by
> 'getSRID()' is always a code from the EPSG authority factory. But we
> would have to make this assumption very clear in our
> documentation. In
> such case, the utilities program would have to be a little bit more
> elaborated in order to search specifically for the EPSG authority (to
> make things worst, EPSG CRS have both a textual and a numerical
> identifier). A volunter for writting this utility, since I'm
> now used to
> write this kind of code. We just have to decide if the above-cited
> assumption is acceptable, and where to put the utility (probably in
> org.geotools.referencing.crs.CRS?).
>
> Martin.
>
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