[QGIS-Developer] OGC API Features provider

[Alessandro Pasotti]

On Mon, Sep 23, 2019 at 8:51 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> Hi,
>
> Just a quick note to mention, to avoid any potential duplication of work
> if
> someone else is about to do that, that in the coming weeks I'll work on
> adding
> support for "OGC API - Features" (previously known as WFS3) on the client
> side, now that it is about to be finalized to its 1.0 version.
>
>
Hi Even,

I'm happy to see you taking this up!



> My initial thought would tend towards to try to add it into the existing
> WFS
> provider. From a UI perspective, I've got some feedback that it would
> probably
> be best to access it through the existing WFS entry to avoid cluttering
> the UI
> with a new provider.
>

I would probably advise against this approach, from the architectural point
of view, I think that it would be better to address the new OGC JSON-based
API with an abstract base class for providers that consume that kind of API
and make WFS3 the first concrete implementation of that base.


> On the code level, the choice between having a dedicated provider or
> adding
> functionnality in the existing WFS one is not so obvious. Technologically,
> there is little in common between traditional WFS ( XML & GML based, KVP
> based
> requests ), and OAPI-F (my own acronym for OGC API - Features) (JSON &
> GeoJSON
> based, with a linking approach). But the WFS provider has something which
> is
> quite useful for the OAPI-F context, which is the local Spatialite-based
> cache
> & the background download capability. Extracting that from the WFS
> provider
> and be generic enough for multiple providers could be quite involved.
>
>
Re-using the WFS-sqlite feature cache looks a good idea, you might want to
refactor it out to core to make it re-usable from a family of providers.


> Opinions about above directions welcome.
>
> Even
>

Looking forward to test it against QGIS Server, we will be providing a
complete client+server solution!

Thanks!

-- 
Alessandro Pasotti
w3:   www.itopen.it
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