Re: Grilo advanced filtering

[Jens Georg <mail jensge org>]

On Di, 2012-07-24 at 10:37 +0200, Jens Georg wrote:

<bump />

> As we discussed before, the current filtering is a "narrowing down" or a
> logical "AND" of a selected set of filters. 
> How open would you be to a more broad solution of the filtering issue,
> thinking of the tracker or similar future plug-ins?
> 
> I've several proposals to make that work, all would imply some caps to
> indicate whether the desired back-end really supports this or not:
> 
> a) Simple: Instead of passing just one GrlOperationOptions, pass a list
> of options. Filters inside the options would be still "AND", the list
> would be considered a large "OR". 
> That of course implies that the result slicing is moved out of
> GrlOperationOption, or, as a "quick hack/contract", is only obeyed in
> the first list entry. 
> It has the benefit that it would be using existing stuff, not delay 0.2
> too much and if I'm not completely mistaken quite powerful already.
>   
> b) More complex: Dissolve GrlOperationOptions, have several filter
> objects and logical operations that can be combined freely, much like
> QtGallery's filtering.
> Has the benefit that it's more flexible in terms of what filters you can
> glue together, you don't have to check if something in the
> OperationOptions is really set, but might be awkward to construct
> filters from C, that's where
> 
> c) Filter Language: comes into the field. Have a simple language that is
> easily transformable in other languages such as SQL, SPARQL etc. as a
> substitute for filtering and the generic query language you already
> provide. This sounds slightly more complex, but in fact could be build
> upon both a) and b), with b) being easier, a) requiring some boolean
> normalization in the process, then transforming to target filter
> language.
> 
> Thoughts, opinions, other ideas?
> 
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