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from web import Document, Template, dispatch |
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from bbox import BBox |
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from warnings import warn |
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from config import spatialdb |
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formats = { 'text/xml': 'gml', 'application/rdf+xml': 'rdf', 'application/json':'json', 'application/atom+xml':'atom'} |
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bbox = BBox(spatial=spatialdb) |
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class Request(Document): |
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# we should pass in a bbox object here, huh |
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def outputformat(self): |
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query = self.input |
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if query.has_key('OUTPUTFORMAT'): |
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self.format = query['OUTPUTFORMAT'].value |
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else: |
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self.format = 'text/xml' |
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return formats[self.format] |
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def bbox(self): |
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return bbox |
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class GetFeature(Request): |
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def GET(self,*args): |
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"""Retrieve features from the DB. By default, returns everything, |
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possibly limited in number by MAXFEATURES (what about paging?) |
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Results can be limited by BBOX and MINDATE and or MAXDATE |
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and one can specify an alternative (but not optional?) OUTPUTFORMAT""" |
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query = self.input |
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features = [] |
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envelope = None |
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box = mindate = maxdate = None |
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if query.has_key('BBOX'): box = query['BBOX'].value |
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if query.has_key('MINDATE'): mindate = query['MINDATE'].value |
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if query.has_key('MAXDATE'): maxdate = query['MAXDATE'].value |
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if box is not None: |
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# a simple form where there are 2 coordinates ( within_box() ) |
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# a complex form where there are N points and an "optional crsuri" |
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# with no indication of how it's specified ( within_shape ) |
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# plus, we may get an optional date start/end/range here. |
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points = box.split(',') |
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if len(points) is 4: |
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features = self.bbox().spatialStore.within_box(minx=points[0],miny=points[1],maxx=points[2],maxy=points[3],mindate=mindate,maxdate=maxdate) |
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else: |
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features = self.bbox().spatialStore.within_shape(points,mindate=mindate,maxdate=maxdate) |
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elif mindate is not None or maxdate is not None: |
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features = self.bbox().spatialStore.within_date(mindate=mindate,maxdate=maxdate) |
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if len(features) > 0: |
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bounds = self.bbox().spatialStore.envelope(features) |
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envelope = ' '.join(bounds) |
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format = self.outputformat() |
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return self.output('feature.'+format,features = features,envelope=envelope,maintainer=self.bbox().maintainer_info()) |
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class DescribeFeatureType(Request): |
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def GET(self, action, input): |
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pass |
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class GetCapabilities(Request): |
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def GET(self): |
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keywords = [] |
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# what keywords would we return sensibly? |
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# is it useful to human-speicify these? |
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# for some applications we can extract them from feed keywords |
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# but the whole lot in response to a req. for Capabilities? |
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# do keywords, to be honest even belong here? |
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maintainer = self.bbox().maintainer_info() |
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return self.output('capabilities.xml',maintainer= maintainer,keywords=[]) |
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