On 2012.03.22, at 3:16 AM, Andrea Aime wrote:
> On Wed, Mar 21, 2012 at 7:51 PM, Glenn Brauen <[email protected]> wrote:
> Hi,
>
> I'm wondering about the status of support for parsing the
> UserDefinedSymbolization element of WMS GetCapabilities responses.
>
> Scanning the geo-tools-devel list archives, I can see a few commits over the
> years referring to the UserDefinedSymbolization keyword. But it appears to
> be only partially implemented in both versions 8.0 (svn checkout from
> yesterday) and 2.7.4. I think enough is there so that the parsing won't
> complain about finding the element but it is ignored if found. I found no
> issue in Jira about this.
>
> I'd like to use Geotools to parse and interrogate these elements and would be
> willing to contribute to seeing this supported. I've been looking at the
> software and have a pretty good idea of what's required.
>
> Are there any plans for this?
>
> Let me summarize, you are planning to modify the existing wms client to
> report if the server can support
> used defined symbolization, and in that case, send down to the server a
> request with a SLDBODY or
> a POST request with full XML GetMap?
> And the style would come from ... where? Directly from the
> MapContext/MapContent (mind the API
> change on trunk) layer?
>
> I don't believe there are any plans for that right now, a contribution in
> that direction would be
> certainly welcomed. Some design discussion on the ml before getting down to
> coding is
> recommended in order to build a patch that gets actually accepted in the code
> base.
>
> Cheers
> Andrea
> -------------------------------------------------------
Hi Andrea,
I guess what I'm proposing is just the first step on the path you are
imagining. :)
For my plans right now, I would like to use GeoTools to help me figure out the
capabilities of WMS to support user styled layers but I am not currently
planning to issue the SLD-specifying GetMap requests from GT. Instead, the GT
parsing code will be part of a servlet providing information about services and
the GetMap requests themselves would come from a client of the servlet
(possibly using OpenLayers).
So what I'm proposing is to add the capability for parsing the
UserDefinedSymbolization attributes and to create a new class (child of
WMSCapabilities) to provide access to those parameters after a GetCapabilities
document has been parsed. I would add public interfaces to WMSCapabilities to
get/set the userDefinedSymbolization object.
The main files that I think would be affected are:
modules/extension/wms/src/main/java/org/geotools/data/ows/WMSCapabilities.java
modules/extension/wms/src/main/java/org/geotools/data/wms/xml/WMSComplexTypes.java
modules/extension/wms/src/test/java/org/geotools/data/wms/xml/test/WMSSchemaTest.java
modules/extension/xsd/xsd-wms/src/main/java/org/geotools/wms/v1_3/WMS.java
and I would add a new class called UserDefinedSymbolization in package
org.geotools.data.wms as a container for the parsed attributes.
Most of it looks pretty straightforward to me. But I have not yet looked
closely at how the schema tokens in WMS.java are generated so I still need to
figure that out.
Cheers,
Glenn
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