On Tue, Dec 23, 2014 at 11:38 PM, Torben Barsballe <
[email protected]> wrote:
> Further looking into how things work, it looks like:
>
> 1. WFS BBox is expected to test the BBox against all geometries by default.
>
> 2. The BBox filter implementaion in geotools is intended to test the bbox
> against a single geometry
>
> It seems that the current (AbstractFeatureSource) implementation gets
> around this limitation by not providing a property name for the other
> geometry, and later testing against all geometries.
>
> Given this, I have a question:
>
> 1. Is a blank (i.e. attPath="") AttributeExpressionImpl intended to match
> all geometries?
> a. If so, the accept() method of this class and related visitors
> should be changed to reflect this.
> b. If not, is there any way of defining an Expression that matches all
> geometries? If this is the case, the WFS XML parser should be updated to
> use this when creating a geotools BBox filter with Query.getFilter
>
The black attribute is what you get when a WFS request uses
BBOX=x1,y1,x2,y2 in a GET style GetFeature request, since the name of the
attribute is unspecified.
The WFS spec does not say to which geometry it applies, just that it's a
shorthand for the XML version.
Unfortunately in the XML version the propertyName parameter is mandatory,
so basically we don't have any direction from the spec.
So, given we don't know, we have to base ourselves on the requirements for
compliance certification, embodied by the CITE tests.
I cannot tell you exactly what the CITE tests do, but for sure we pass them
using the JDBCDataStore implementation, so, I would
mimick their behavior (and make sure any chance to the base classes does
not make the GeoServer WFS CITE tests fail)
Cheers
Andrea
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