Hi all,
I'm investigating supporting rendering transformations[1] in the GeoServer
CSS module[2]. This functionality is implemented in SLD by using OGC Filter
encoded expressions to construct WPS processes and parameters, so I was
expecting to be able to use ECQL to support them in CSS. However, I seem
to be running into some trouble. Building against a recent snapshot of
GeoTools 8, I found that the following ECQL does not work as I hoped:
> gs:Contour(
> parameter("data"),
> parameter("levels", 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800)
> )
Investigating further, I see that I get a different error for undefined
functions than for ones with a colon-delimited identifier, which suggests
that function names don't actually support namespacing. The behavior I'm
seeing is as follows:
> scala> org.geotools.filter.text.ecql.ECQL.toExpression("f(123)")
> org.geotools.filter.text.cql2.CQLException: Function not found. Parsing :
> f(123).
> scala> org.geotools.filter.text.ecql.ECQL.toExpression("g:f(123)")
> org.geotools.filter.text.cql2.CQLException: Encountered "(" at line 1,
> column 4.
Should this work? Am I doing it wrong? Any insight would be appreciated.
Another issue I encountered is that the SLDTransformer does not currently
support encoding Transformations. That one I think I can resolve, but I
want to make sure it actually works in the CSS converter before submitting
a patch.
[1]: http://docs.codehaus.org/display/GEOTOOLS/Rendering+transformations
[2]: http://docs.geoserver.org/stable/en/user/community/css/index.html
--
David Winslow
OpenGeo - http://opengeo.org/
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