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Re: [Geotools-gt2-users] App-Schema: how to encode geometry element not contained in gml:GeometryPropertyType
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From: Stefano C. <ste...@ge...> - 2015-06-23 17:36:00
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Hi all,
I'm resurrecting this old thread because I've been working on this again
and I've made a few new discoveries.
As a quick reminder, the mapping I'm struggling with is:
<AttributeMapping>
<targetAttribute>
lcv:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:AbstractGeometry
</targetAttribute>
<sourceExpression><OCQL>geom</OCQL></sourceExpression>
<targetAttributeNode>gml:MultiSurfaceType</targetAttributeNode>
</AttributeMapping>
which produces an empty gml:AbstractGeometry tag.
First of all, the weirdest of thigs: I found a way to make it work as
expected (actually, my colleague Mauro Bartolomeoli did).
Steps to reproduce:
1) inside Eclipse, import all GeoServer projects, plus gt-app-schema
from GeoTools.
2) add the gt-app-schema project to the classpath of gs-web-app the
Eclipse way (Configure build path --> Projects --> Add) and NOT by
running mvn eclipse:clean eclipse:eclipse -Papp-schema
3) start GeoServer from Eclipse... et voilà, it works! The
gml:AbstractGeometry tag inside gmd:polygon is correctly encoded as a
gml:MultiSurface geometry.
If I run GeoServer from Eclipse the standard way or build a WAR, deploy
and run it, all I get is an empty gml:AbstractGeometry element.
Second, I've found where the code goes wrong, but I can't explain why.
The problem occurs inside org.geotools.xml.Encoder, line 769:
if (entry.element.isAbstract()) {
..
}
If I run GeoServer from Eclipse the standard way, when the time to
encode gml:AbstractGeometry comes, entry.element.isAbstract() returns
false, causing the code inside the if block to be skipped. If I add
gt-app-schema to the build path as described previously,
entry.element.isAbstract() returns true and the geometry is encoded just
fine.
Apparently, this wrong element declaration comes from a call to
encoder.getSchemaIndex().getChildElementParticles() inside the class
org.geotools.xml.impl.BindingPropertyExtractor:
https://github.com/geotools/geotools/blob/aa0d0346e4bb4a5a2055559c22d2b12ded7cbd20/modules/extension/xsd/xsd-core/src/main/java/org/geotools/xml/impl/BindingPropertyExtractor.java#L71
Does this ring any bell? Any suggestion on what other things I could
try?
BTW, I'm working on GeoServer/GeoTools master.
Many thanks!
Il giorno gio, 14/05/2015 alle 12.31 +0200, Stefano Costa ha scritto:
> Quick update: I tried both mappings suggested by Ben with the current
> development version of GeoServer (master branch, last commit
> 6db6bdbb9dc1be9daec066762c2c6bc5f7c7259d), but the result is unchanged
> (tried all WFS versions. 1.0.0, 1.1.0 and 2.0.0).
>
> What drives me crazy is that the LandCoverUnit feature type has a
> geometry property (a "standard" one, of type gml:GeometryPropertyType),
> which is encoded just fine with this mapping:
>
> <AttributeMapping>
> <targetAttribute>lcv:geometry</targetAttribute>
> <targetAttributeNode>
> gml:MultiSurfacePropertyType
> </targetAttributeNode>
> <sourceExpression>
> <OCQL>geom</OCQL>
> </sourceExpression>
> </AttributeMapping>
>
> I interpret this fact as further evidence that the problem lies in
> gmd:polygon not being a gml:GeometryPropertyType, but a
> gss:GM_Object_PropertyType... just a guess, though.
>
> Best regards,
> Stefano
>
> Il giorno gio, 14/05/2015 alle 10.18 +0200, Stefano Costa ha scritto:
> > Hi Mauro,
> >
> > Il giorno gio, 14/05/2015 alle 10.12 +0200, Mauro Bartolomeoli ha
> > scritto:
> > > Hi Stefano,
> > > I remember having the same problem with some tests I did some time
> > > ago.
> > >
> > >
> > > Could you please try a more recent version (latest 2.8 SNAPSHOT for
> > > example)? Because if I am not wrong, this should have already been
> > > fixed.
> >
> > Sure thing, I'll test it ASAP.
> >
> > > Also, try with a different WFS version (2.0, 1.1.0) and see if the
> > > result is consistent.
> >
> > Tried both WFS 2.0 and 1.1.0, same result :-(
> >
> > >
> > >
> > > Thanks
> > > Mauro
> >
> > Thanks for the suggestion,
> > Stefano
> >
> > >
> > > 2015-05-13 23:28 GMT+02:00 Stefano Costa
> > > <ste...@ge...>:
> > > Hi Ben,
> > > thanks for your suggestions.
> > > Unfortunately, they didn't work for me.
> > >
> > > > please try using targetAttributeNode to treat this property
> > > as a
> > > > gml:GeometryPropertyType:
> > > >
> > > > <AttributeMapping>
> > > > <targetAttribute>
> > > >
> > > lcv:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon
> > > > </targetAttribute>
> > > >
> > > <targetAttributeNode>gml:GeometryPropertyType</targetAttributeNode>
> > > > <sourceExpression>
> > > > <OCQL>geom</OCQL>
> > > > </sourceExpression>
> > > > </AttributeMapping>
> > >
> > > Same result as before, the geometry is encoded as a WKT
> > > string.
> > >
> > > >
> > > > This tutorial suggests that you could also map the contained
> > > > gml:AbstractGeometry (no need for targetAttributeNode):
> > > >
> > > https://sites.google.com/site/inspiremappingtutorial/land-use-mapping-details/5-2-spatialplan_mapping-xml
> > > >
> > > > <AttributeMapping>
> > > > <targetAttribute>
> > > >
> > > lcv:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:AbstractGeometry
> > > > </targetAttribute>
> > > > <sourceExpression>
> > > > <OCQL>geom</OCQL>
> > > > </sourceExpression>
> > > > </AttributeMapping>
> > >
> > > This configuration produces an empty gml:AbstractGeometry tag
> > > nested
> > > inside a gmd:polygon tag:
> > >
> > > <lcv:extent>
> > > <gmd:EX_Extent>
> > > <gmd:geographicElement>
> > > <gmd:EX_BoundingPolygon>
> > > <gmd:polygon>
> > > <gml:AbstractGeometry/>
> > > </gmd:polygon>
> > > </gmd:EX_BoundingPolygon>
> > > </gmd:geographicElement>
> > > </gmd:EX_Extent>
> > > </lcv:extent>
> > >
> > > I forgot to mention I'm using GeoServer 2.6.2, so GeoTools
> > > 12.2.
> > >
> > > I'll continue the investigation.
> > >
> > > >
> > > > Please let us know if either of these mappings work for you.
> > > >
> > > > Kind regards,
> > > > Ben.
> > >
> > > Best regards,
> > > Stefano
> > >
> > >
> > >
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> > >
--
Best regards,
Stefano Costa
==
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==
Dott. Stefano Costa
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
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