Hi,
After debugging this, I think this is a bug in geotools. I have made a
unittest based on the snippet below, and made a commit in my clone. Can
somebody review if this is really a bug, if so, I will make an issue in
Jira, and create a pull request.
The commit fixing this issue for me:
https://github.com/mtoonen/geotools/commit/d17e61bf48f9445eae76fe5f115a8d2568dbe0f1
Basically, when there are multiple Surface elements, it parses the
first/deepest Surface element (which returns a correct MultiPolygon),
and then moves on to the outer Surface, where it tries to get underlying
polygons, which fails (there are no polygons, only the previously parsed
MultiPolygon). Creating a new multipolygon with a null arguments
(https://github.com/geotools/geotools/blob/master/modules/extension/xsd/xsd-gml3/src/main/java/org/geotools/gml3/bindings/ext/SurfaceTypeBinding.java#L71)
creates an empty MultiPolygon.
So my solution was to check if there was already a parsed MultiPolygon
and - if so - return that one. Otherwise parse the patches as before.
Thanks!
Regards,
Meine Toonen
B3Partners BV
Tel: 030 214 2083
On 12-04-16 10:18, Meine Toonen wrote:
Hi list,
When parsing a gml file, I came upon a problem. When the geometry part
of the gml file has a surfaceMember, the GML parser returns an empty
MultiPolygon. When removing the surfaceMember (and preceding Surface)
element, it returns a correct MultiPolygon.
I've created a simplified version of the gml snippet:
<?xml version="1.0"?>_*
*__*<gml:Surface>*__*
*__* <gml:surfaceMember>*_
<gml:Surface gml:id="ID2">
<gml:patches>
<gml:PolygonPatch>
<gml:exterior>
<gml:LinearRing>
<gml:posList>0 0 0 1 1 1 1 0 0 0</gml:posList>
</gml:LinearRing>
</gml:exterior>
</gml:PolygonPatch>
</gml:patches>_*
*__* </gml:Surface>*__*
*__* </gml:surfaceMember>*_
</gml:Surface>
I've marked the offending elements. When removing the underlined+bold
elements, parsing works. I've created a gist:
https://gist.github.com/mtoonen/dc33661215bffcfb37820afe6fe97a20
The GML is valid and well-formed.
Any thoughts?
Regards,
--
Meine Toonen
B3Partners BV
Tel: 030 214 2083
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