Hey Andrea,
If you look on master and 8.x you will find this method actually already
exists in the ParserDelegate2 class. The canHandle there method looks like:
boolean canHandle(QName elementName, Attributes attributes, Handler
handler, Handler parent);
And gives the full attributes. I think that should do the trick?
-Justin
On Fri, Jul 13, 2012 at 3:55 AM, Andrea Aime
<[email protected]>wrote:
> Hi,
> I'm getting in some trouble with parser delegates, trying to look for a
> solution.
>
> In WPS we have this thing were a WFS requet can be embedded in a WPS
> request
> to represent a input of the process.
> The whole XML is a single block and the parser traverses it directly using
> a mechanism
> called parser delegates, where the parsing configuration knows there might
> be some
> other elements, coming from other schemas, embedded in the main document.
>
> WPS in particular can delegate to a WFS 1.1 parser and a WCS 1.1 parser.
> However a WPS request can legitimately contain a WFS 2.0 or a WFS 1.0
> request too.
>
> I haven't tried, but believe that it would be easy to make it parse a WFS
> 2.0 embedded
> request because the parser delegate mechanism matches based on the
> target namespace, which is "http://www.opengis.net/wfs/2.0"; for WFS 2.0.
> Unfortunately it is the same, http://www.opengis.net/wfs, for both WFS
> 1.0 and WFS 1.1
> (big mistake, since the element names are the same).
>
> The two standards are close enough that we don't see much of a problem,
> but then
> we get into parsing a gml:Box, which exists only for GML 2.0 (used by WFS
> 1.0)
> and boom, the parsing fails (actually, a NPE happens later because the box
> was not parsed
> at all).
>
> What I was thinking that might solve the problem is to make canHandle
> method of
> XSDParser delegate get a full element object instead of a QName, so that
> it can also
> evaluate the version attribute: this way the WFS 1.1 could refuse to parse
> the
> WFS 1.0 request and leave the field open for the other parser
>
> Opinions?
>
> Cheers
> Andrea
>
> --
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>
> Ing. Andrea Aime
> @geowolf
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>
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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