Re: [udig-devel] Impossible to modify geometries when a filter is applie

[Jody Garnett <jody.garnett@xxxxxxxxx>]

That is correct; since when a Filter is applied onto a Layer you end up 
creating a view of the original data (the mechanism can also use a Query 
to restrict what attributes are displayed - it really is a subset of an 
origional dataset).
In programming terms this means that only a FeatureSource is available.

A couple of ideas:
- If you want you can look into how this is done; and see if you can 
implement your own FeatureStore wrapper to apply "just" a Filter (rather 
than a Filter or Query as is currently done).
- You could choose to modify your style so that only certain features 
are painted (they would all still be there to be selected and or edited)
- A common GIS trick is to make one layer that displays a subset of the 
information; and another layer that is not visible (but is selectedable 
and editable). You could edit the data the one layer; and see the result 
on the first layer

The last one is of course cheapest to implement.

Jody

Jacques LESCOT wrote:
> Hi uDiggers,
>
> I have a strange behavior when a Filter is applied onto a Layer : I 
> can not modify datas, edit tools are deactivated and the Table view is 
> in read-only mode.
> However, if I did not add apply any filter to the layer, editing 
> capabilities are enabled. Is this a limitation ? Should I better 
> filter datas on server side ?
>
> For your information, I am working on the trunk version of uDig and 
> creating layers and associated filter programmatically. Datas are 
> retrieved from an Oracle database.
>
> Here is the snippet of code I am using to add a filter to the layer :
>     
> my_layer.getStyleBlackboard().put(ProjectBlackboardConstants.LAYER__DATA_QUERY, 
> my_filter);
>
> Regards,
> Jacques
>
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