Hi Andrea,
Thanks, I'm going to make some time to clean up unit tests, etc. Also,
thanks for pointing out the PMD error!
I'm curious how storing the transforms in the ResourcePool would work.
Would it just store a List<Definition>? Or should it have an
encapsulating TransformObject? (I'm wondering if any of the work that
I'm doing would help the GS UI work or if the UI work is logically
orthogonal.)
Cheers,
Jim
On 11/4/2020 2:53 AM, Andrea Aime wrote:
Hi Jim,
for a long time I wanted to utilize the TransformDataStore to power
renaming and retyping in GeoServer.
I was hoping to get that through configuration in the layer page,
making the attribute details table editable...
and that's why it never happened in the end, changing the UI and the
associated config is not trivial
(once you have that, setting up the transformation in the ResourcePool
is easy).
As far as I can tell, the datastore allows to transform one feature
type, with some text based definitions.
It will keep some attributes un-modified, and allow to add new
computed/renamed ones at the end
(or if one goes for specifying only transformations, get full control
of order too, as one could
add "att=att" "transformations" keeping a certain attribute
un-modified, but in the desired position).
The approach you're going towards makes it easier to get it going,
it's probably time to allow "better"
to go forward in face of a "best" that does not want to come :-D
Go for it.
Cheers
Andrea
On Tue, Nov 3, 2020 at 7:20 PM Jim Hughes <jhug...@ccri.com
<mailto:jhug...@ccri.com>> wrote:
Hi all,
At various times, Jody and I have chatted about having a "CQL
View" in
GeoServer (or something similar akin to the SQL Views) that'd
leverage
the Transform module and allow one to add columns to a FeatureSource
based on expressions. Such expressions could use existing or
custom CQL
functions and that'd open a world of possibilities.
Last week, I asked Jody about this idea again and he indicated
that one
would really just need to write a DataStoreFactory. I banged out an
initial implementation as a starting place for the conversation.
This
implementation provides a way to project down to a subset of
attributes
as well as add new columns/attributes to a FeatureStore.
If folks like it as-is, I'd be happy to add unit tests, and
documentation wherever we see fit. Thanks in advance for some
feedback
on this idea!
https://github.com/geotools/geotools/pull/3196/files
<https://github.com/geotools/geotools/pull/3196/files>
Cheers,
Jim
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