On Sat, Apr 12, 2014 at 9:08 PM, Anthony F <[email protected]> wrote:
> I like the Transformation process/api quite a lot too. So I think a
> reasonable approach to implementing this would be to intercept the Query in
> the FeatureSource.getFeatures(Query) method and check if the listed
> properties are Definitions/Transformations. If they are then rewrite the
> Query and process the transformations in the native optimal manner. The
> only thing I don't like is that the transformation has to be decoded from
> string form rather than being passed in as a data structure. See any
> obvious problems with this approach? Any other recommendations?
>
That would be data store specific, that is, a custom convention that works
in your store only, but it should be workable.
The only other option I can think of would be to extend Query to allow
property to be (as a third choice, comparing to the existing String and
PropertyName)
a full fledged Expression, would be nicer in terms of clarity of what
you're asking, yet basically no store would support that out of the box
(although a pure in memory
implementation would not be _that_ hard to add, for example, by folding on
the fly a transforming feature source on top
of the normal result).
This would be an API change, so a format improvement proposal with voting
would be required.
Cheers
Andrea
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