Hi,
I’m currently working on an improvement for the dimensions support in GeoServer
that I would like to share.
Currently our default value support is rather generic, stored in this class and subject
to different policies:
The default value is stored as a String, and it’s up to the strategy to decide what to do with it.
In all cases though, it’s a single value, never a range, and that poses some limitations and make
some interesting use cases not possible.
In particular, when using the FIXED policy, that uses the reference value as the
default value, it would be nice to allow usage of a range instead of a single value.
This is made especially interesting by our current ability to express a range using
relative expressions, like:
PT36H/PRESENT
See this for an example:
http://docs.geoserver.org/latest/en/user/services/wms/time.html#specifying-a-relative-interval
Mind, this is unrelated to whether or not the actual dimension is range based, or not,
as it makes a lot of sense also the dimensions that are not range based.
The idea is to extend a bit the UI so that it allows the choice of a single value, or range
using the well known range syntax (just relaxing the validators to allow also ranges),
and then making sure the code dealing with dimension can handle ranges.
In several places it already can, since the user can invariably enter a single value
or a range already, but others know they are dealing with the default value and
are enforcing a single value representation instead, those need to be amended too.
This improvement is going to be implemented on master, with an interest in backport
later.
Do you see any problems with it?
Cheers
Andrea
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