On Wed, Dec 22, 2010 at 6:08 AM, Miles Jordan <[email protected]>wrote:
> Andrea Aime wrote:
> > On Tue, Dec 21, 2010 at 6:57 AM, Miles Jordan
> > <[email protected]> wrote:
> >> Hmm.. trying to use the PropertyExists function and not sure how to
> > reference the feature. I would have thought that it would only take
> > one argument, the propertyName, but the docs say:
> >>
> >> Name - PropertyExists Arguments - f:Feature, propertyName:String
> >> Description - Returns true if f has a property named propertyName
> >>
> > All functions get the current feature as an implicit argument. I
> > guess the documentation is wrong :-p
> >
> > The function would have to be called like:
> >
> > <ogc:Function name="PropertyExists">
> > <ogc:Literal>MY_PROPERTY</ogc:Literal>
> > </ogc:Function>
>
> That's what I thought, in fact I tried it, but got a NPE. Digging deeper,
> it works fine by itself but not inside of a boolean operation. i.e. this
> works:
>
> <ogc:Filter>
> <ogc:PropertyExists>
> <ogc:Literal>MY_PROPERTY</ogc:Literal>
> </ogc:PropertyExists>
> </ogc:Filter>
>
> But this does not:
>
> <ogc:Filter>
> <ogc:And>
> <ogc:PropertyExists>
> <ogc:Literal>MY_PROPERTY</ogc:Literal>
> </ogc:PropertyExists>
> <ogc:PropertyIsEqualTo>
> <ogc:PropertyName>MY_PROPERTY</ogc:PropertyName>
> <ogc:Literal>1</ogc:Literal>
> </ogc:PropertyIsEqualTo>
> </ogc:And>
> </ogc:Filter>
>
> In fact, the Boolean operation will work with other functions, just not
> with PropertyExists. Any final thoughts before I head over to JIRA? I
> haven't tried this on the latest Beta.
>
>
Miles, I'm actually confused. If I look into the Filter specification there
is no such a thing
as a "PropertyExists" filter, so I'm not surprised the above does not work.
Have a look for yourself:
http://schemas.opengis.net/filter/1.0.0/filter.xsd
The proper way to write the same filter would be something like:
<ogc:Filter>
<ogc:And>
<ogc:PropertyIsEqualsTo>
<ogc:Function name="PropertyExists">
<ogc:Literal>MY_PROPERTY</ogc:Literal>
</ogc:Function>
<ogc:Literal>true</ogc:Literal>
</ogc:PropertyIsEqualsTo>
<ogc:PropertyIsEqualTo>
<ogc:PropertyName>MY_PROPERTY</ogc:PropertyName>
<ogc:Literal>1</ogc:Literal>
</ogc:PropertyIsEqualTo>
</ogc:And>
</ogc:Filter>
If anything the parser should throw a bloody exception saying it does not
know
what ogc:PropertyExists is :-)
Cheers
Andrea
-----------------------------------------------------
Ing. Andrea Aime
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584962313
fax: +39 0584962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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