On Mon, Oct 24, 2011 at 5:36 PM, Jan De Moerloose <
[email protected]> wrote:
> Hi all,
>
> i would like to extend the way in which external graphics can be
> resolved in the main Geotools SLD parser.
> As far as i know, you can now specify the location of an external
> graphic in two ways:
> - specify the location as a relative URL w.r.t. the SLD document URL
> - specify the location as a java classpath resource
>
> The first case assumes that the document URL is known and reachable,
> which is not allways the case (e.g. transfer of SLD over the wire or
> configuring SLD in a database and so on). The second case is a nice
> fallback in many circumstances but for web applications it is very
> common to put graphics in a non-classpath location like the web context.
>
> My suggestion is to make the location more customizable by adding a
> resource locator to the SLD parser:
> setOnlineResourceLocator(ResourceLocator resourceLocator);
>
> where ResourceLocator would define the following:
> public URL locateResource(String uri);
>
> Do you think this is a good enhancement or did i overlook anything in
> the current implementation ?
>
The SLD specification says that a Graphic can contain a number of
different external resources and marks, with a fallback mechanism:
if the first one cannot be found, the second is looked up, and so on.
It seems to me what you want is already there, just not transparent.
Another option if you need something programmatic you also look into
implementing
your own ExternalGraphicFactory which might have as much fallback logic
as you like (I guess).
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
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http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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