Freeform "ENV" and "STYLES" parameter filters
---------------------------------------------

                 Key: GEOS-4848
                 URL: https://jira.codehaus.org/browse/GEOS-4848
             Project: GeoServer
          Issue Type: Improvement
          Components: GWC
            Reporter: Rohan Singh
            Assignee: Andrea Aime
            Priority: Minor
         Attachments: gwc-env.patch

This patch adds an option to the GWC integration to allow freeform ENV and 
STYLES parameters. It's implemented as a {{RegexParameterFilter}} with a 
pattern of {{".*"}}.

This is handy when the requested SLD ("styles") and values for SLD variable 
substitution ("env") are very variable, but still need to be cached.

Currently I am using this for a layer in which specific features need to be 
highlighted. For example:

bq. {{styles=highlight&env=featureToHighlight:myFeature}}

This is similar to the second technique described at 
http://trac.osgeo.org/openlayers/wiki/Highlighting. While this generates a 
large number of tiles, I still need the generated tiles to be cached. I imagine 
others will have similar use cases.

I know there is work underway to improve the GWC configuration UI, but this 
could solve some use cases right away.

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