Thanks Jody, returning 2 outputs seems a very reasonable solution for this
use case.
Best regards,
César
2014-05-08 4:12 GMT+02:00 Jody Garnett <[email protected]>:
> Comments inline ...
>
> We have developed a WPS process which takes some pagination parameters
>> (startIndex, maxFeatures) in order to return a subset of the whole
>> FeatureCollection.
>>
>> In order to properly interact with client code, we'd like to include a
>> totalCount property in the response, indicating the size of the total
>> feature collection. Which is the best way to encode such parameter?
>>
>
> I would guess you should encode it as numberOfFeatures (i.e. number of
> features provides in answer to your request?).
>
> If you wanted to provide a totalNumberOfFeatures you could extend the GML
> feature collection in order to provide additional attributes. The trick is
> where to store it so client code can validate against it? I suppose it
> would be okay if you included such a definition in your DescribeFeatureType
> response ... or perhaps in each WPS process response (since a similar
> approach is already taken to validate common wps arguments).
>
> I have been thinking on the following approaches, but the main problem is
>> that Geoserver WPS documentation is a bit vague regarding supported
>> response types and how they are encoded:
>>
>
> It is more that we have not exhaustively defined how to handle/validate
> ComplexData.
>
> - To return a different return type (such as a JSON object or similar).
>> We won't actually have any geometry in the response of this WPS process,
>> just an array of records, so the whole thing could be encoded on a JSON
>> object (included the totalCount field).
>>
>> - To create an interface extending SimpleFeatureCollection (let's call it
>> PartialFeatureCollection) including a totalCount property (and probably
>> some other useful properties). Then we need an implementation of that
>> interface that acts as a wrapper of a SimpleFeatureCollection to wrap our
>> current response. Finally, we would probably need a custom PPIO to properly
>> encode this specialized response.
>>
>> - To investigate if we can add some property to the FeatureCollection,
>> assuming this property is then properly encoded in the response (as this is
>> not a property of any of the features but of the whole collection).
>>
>> Do you have any suggestion?
>>
>
> Yeah I think you should consider having your WPS process produce more than
> one output at the same time, that way you are not messing with GML and
> schema validation, just have your output include a feature collection as
> the compilex data, and a count as simple data.
>
> Just how a WPS can have more than one input, it can also have more than
> one output.
>
>>
>> Thanks in advance,
>>
>> César
>>
>> --
>> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>> César Martínez Izquierdo
>> GIS developer
>> - - - - - - - - - - - - - - - - - - - -
>> Blog: http://geotechnotes.wordpress.com/
>> ETC-SIA: http://sia.eionet.europa.eu/
>> Universitat Autònoma de Barcelona (SPAIN)
>> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>>
>>
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César Martínez Izquierdo
GIS developer
- - - - - - - - - - - - - - - - - - - -
Blog: http://geotechnotes.wordpress.com/
ETC-SIA: http://sia.eionet.europa.eu/
Universitat Autònoma de Barcelona (SPAIN)
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