sounds good to me
Ian
On Thu, 22 Feb 2024 at 10:09, Andrea Aime <andrea.a...@geosolutionsgroup.com>
wrote:
> On Wed, Feb 21, 2024 at 7:37 PM Jody Garnett <jody.garn...@gmail.com>
> wrote:
>
>> That sounds good .. and surprising it is not there already? Is it just
>> not a feature of SLD?
>>
>
> Indeed, as crazy as it sounds, it's not an SLD feature. This is an excerpt
> from SE 1.1 schemas:
>
> <xsd:complexType name="ChannelSelectionType">
> <xsd:choice>
> <xsd:sequence>
> <xsd:element ref="se:RedChannel"/>
> <xsd:element ref="se:GreenChannel"/>
> <xsd:element ref="se:BlueChannel"/>
> </xsd:sequence>
> <xsd:element ref="se:GrayChannel"/>
> </xsd:choice>
> </xsd:complexType>
>
>
>> Default method very much appreciated to be kind to implementations. For a
>> default setter should it log a message, or throw a not implemented
>> exception?
>>
>
> Yes. There is only one implementation, that will be updated, so the
> exception should not be triggered in the practice.
>
>
>> If you are making an API change perhaps attack the channel traversal
>> problem directly with a default method to list all 4 channels...
>>
>
> The existing API is actually going to collaborate for this bit, here is
> what we have in the style visitor:
>
> /**
> * Called when accept is called on a raster {@link ChannelSelection}
> element
> *
> * @param cs the {@link ChannelSelection} to visit.
> */
> void visit(ChannelSelection cs);
>
> /**
> * Called when accept is called on a raster {@link
> SelectedChannelType} element
> *
> * @param sct the {@link SelectedChannelType} to visit.
> */
> void visit(SelectedChannelType sct);
>
> So it's up to the implementation to unpack the channel selection and call
> the visit on the single channel selection type.
> All existing implementations will be updated to call also on the new alpha
> channel. No need for a new visit method here.
>
> All in all, existing implementations not using the alpha channel should be
> unaffected, which should help backporting this change.
> Thoughts?
>
> Cheers
> Andrea
>
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>
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> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions Group
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>
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--
Ian Turton
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