[PyWPS-dev] Question about process inputs

[Suzana Barreto]

Hi All,

I am in the process of testing a process I created using PyWPS 4.  I have
found an odd issue with the LiteralInputs for my process.  So for example,
my process takes an input parameter (stats) where I have a max_occurs=9
which should allow for any number of strings detailing the statistics I
would like calculated for a given input file. When I issue a request with a
number of values ('sum', 'median', 'std') for that particular parameter, my
response contains the result for only 1 of the statistics for that
parameter.  I traced the issue to service.py (create_literal_inputs), line
216 where a deque is created using the LiteralInput's max_occurs parameter
to limit the size.  Unfortunately, it appears that this attribute is always
1.  When I do a describeProcess request, I notice that the max_occurs is
also equal to 1 and this happens regardless of whatever value I change the
max_occurs to on that or any other LiteralInputs for my process.  So my
question is, has anyone come across this issue?  Am I doing something
wrong?  Below is the code showing how I have defined the inputs.

class BasicZonalStats(Process):
    def __init__(self):
        inputs = [ComplexInput('aoi_ndvi','Raster ndvi',

supported_formats=[Format('image/tiff'),
Format('application/x-ogc-wcs')],
                               min_occurs=1, max_occurs=1, mode=MODE.NONE),
                  LiteralInput('band','the band to calculate stats
for', data_type='integer', min_occurs=1, max_occurs=1,
                               mode=MODE.SIMPLE),
                  LiteralInput('stats', 'Statistics to calculate',
data_type='string', min_occurs=0, max_occurs=9,
                               allowed_values=('sum', 'std', 'median',
'majority', 'minority', 'unique', 'range',
                                               'nodata', 'nan'),
mode=MODE.SIMPLE),
                  LiteralInput('nodata','Nodata value',
data_type='integer',mode=MODE.SIMPLE),
                  ComplexInput('zones', 'Vector polygons to calculate
stats on.',
                               supported_formats=[Format('application/json')],
                               min_occurs=1, max_occurs=1, mode=MODE.NONE)

                  ]
        outputs = [ComplexOutput('zonal_stats', 'Attribute Table',
                                 supported_formats=[Format('application/json')],
                                 )]

        super(BasicZonalStats, self).__init__(
            self._handler,
            identifier='zonal',
            version='0.1',
            title="Basic Zonal Statistics using Rasterstats",
            abstract="This is a naive and basic WPS, it assumes that
both vector and raster inputs are in the same"
                     "projection and as such does not do any error
checking.  This will be fixed at a later stage so f"
                     "or now please ensure that the inputs are in the
same projection.",
            profile='',
            inputs=inputs,
            outputs=outputs,
            store_supported=True,
            status_supported=True
        )

Any help with this would be much appreciated.
Thanks,
Suzana
-- 



*Dr Suzana BarretoSoftware AnalystEnvironment Systems*
Tel: +44 (0) 1970 626688
www.envsys.co.uk

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