app/django/contrib/gis/feeds.py
author Sverre Rabbelier <sverre@rabbelier.nl>
Mon, 07 Sep 2009 20:27:37 +0200
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from django.contrib.syndication.feeds import Feed as BaseFeed, FeedDoesNotExist
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from django.utils.feedgenerator import Atom1Feed, Rss201rev2Feed
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class GeoFeedMixin(object):
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    """
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    This mixin provides the necessary routines for SyndicationFeed subclasses
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    to produce simple GeoRSS or W3C Geo elements.
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    """
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    def georss_coords(self, coords):
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        """
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        In GeoRSS coordinate pairs are ordered by lat/lon and separated by
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        a single white space.  Given a tuple of coordinates, this will return
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        a unicode GeoRSS representation.
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        """
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        return u' '.join([u'%f %f' % (coord[1], coord[0]) for coord in coords])
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    def add_georss_point(self, handler, coords, w3c_geo=False):
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        """
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        Adds a GeoRSS point with the given coords using the given handler.
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        Handles the differences between simple GeoRSS and the more pouplar
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        W3C Geo specification.
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        """
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        if w3c_geo:
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            lon, lat = coords[:2]
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            handler.addQuickElement(u'geo:lat', u'%f' % lat)
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            handler.addQuickElement(u'geo:lon', u'%f' % lon)
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        else:
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            handler.addQuickElement(u'georss:point', self.georss_coords((coords,)))
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    def add_georss_element(self, handler, item, w3c_geo=False):
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        """
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        This routine adds a GeoRSS XML element using the given item and handler.
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        """
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        # Getting the Geometry object.
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        geom = item.get('geometry', None)
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        if not geom is None:
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            if isinstance(geom, (list, tuple)):
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                # Special case if a tuple/list was passed in.  The tuple may be
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                # a point or a box
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                box_coords = None
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                if isinstance(geom[0], (list, tuple)):
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                    # Box: ( (X0, Y0), (X1, Y1) )
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                    if len(geom) == 2:
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                        box_coords = geom
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                    else:
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                        raise ValueError('Only should be two sets of coordinates.')
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                else:
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                    if len(geom) == 2:
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                        # Point: (X, Y)
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                        self.add_georss_point(handler, geom, w3c_geo=w3c_geo)
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                    elif len(geom) == 4:
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                        # Box: (X0, Y0, X1, Y1)
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                        box_coords = (geom[:2], geom[2:])
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                    else:
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                        raise ValueError('Only should be 2 or 4 numeric elements.')
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                # If a GeoRSS box was given via tuple.
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                if not box_coords is None:
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                    if w3c_geo: raise ValueError('Cannot use simple GeoRSS box in W3C Geo feeds.')
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                    handler.addQuickElement(u'georss:box', self.georss_coords(box_coords))
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            else:
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                # Getting the lower-case geometry type.
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                gtype = str(geom.geom_type).lower()
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                if gtype == 'point':
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                    self.add_georss_point(handler, geom.coords, w3c_geo=w3c_geo) 
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                else:
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                    if w3c_geo: raise ValueError('W3C Geo only supports Point geometries.')
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                    # For formatting consistent w/the GeoRSS simple standard:
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                    # http://georss.org/1.0#simple
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                    if gtype in ('linestring', 'linearring'):
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                        handler.addQuickElement(u'georss:line', self.georss_coords(geom.coords))
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                    elif gtype in ('polygon',):
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                        # Only support the exterior ring.
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                        handler.addQuickElement(u'georss:polygon', self.georss_coords(geom[0].coords))
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                    else:
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                        raise ValueError('Geometry type "%s" not supported.' % geom.geom_type)
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### SyndicationFeed subclasses ###
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class GeoRSSFeed(Rss201rev2Feed, GeoFeedMixin):
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    def rss_attributes(self):
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        attrs = super(GeoRSSFeed, self).rss_attributes()
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        attrs[u'xmlns:georss'] = u'http://www.georss.org/georss'
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        return attrs
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    def add_item_elements(self, handler, item):
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        super(GeoRSSFeed, self).add_item_elements(handler, item)
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        self.add_georss_element(handler, item)
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    def add_root_elements(self, handler):
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        super(GeoRSSFeed, self).add_root_elements(handler)
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        self.add_georss_element(handler, self.feed)
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class GeoAtom1Feed(Atom1Feed, GeoFeedMixin):
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    def root_attributes(self):
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        attrs = super(GeoAtom1Feed, self).root_attributes()
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        attrs[u'xmlns:georss'] = u'http://www.georss.org/georss'
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        return attrs
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    def add_item_elements(self, handler, item):
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        super(GeoAtom1Feed, self).add_item_elements(handler, item)
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        self.add_georss_element(handler, item)
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    def add_root_elements(self, handler):
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        super(GeoAtom1Feed, self).add_root_elements(handler)
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        self.add_georss_element(handler, self.feed)
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class W3CGeoFeed(Rss201rev2Feed, GeoFeedMixin):
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    def rss_attributes(self):
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        attrs = super(W3CGeoFeed, self).rss_attributes()
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        attrs[u'xmlns:geo'] = u'http://www.w3.org/2003/01/geo/wgs84_pos#'
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        return attrs
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    def add_item_elements(self, handler, item):
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        super(W3CGeoFeed, self).add_item_elements(handler, item)
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        self.add_georss_element(handler, item, w3c_geo=True)
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    def add_root_elements(self, handler):
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        super(W3CGeoFeed, self).add_root_elements(handler)
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        self.add_georss_element(handler, self.feed, w3c_geo=True)
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### Feed subclass ###
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class Feed(BaseFeed):
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    """
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    This is a subclass of the `Feed` from `django.contrib.syndication`.
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    This allows users to define a `geometry(obj)` and/or `item_geometry(item)`
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    methods on their own subclasses so that geo-referenced information may
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    placed in the feed.
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    """
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    feed_type = GeoRSSFeed
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    def feed_extra_kwargs(self, obj):
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        return {'geometry' : self.__get_dynamic_attr('geometry', obj)}
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    def item_extra_kwargs(self, item):
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        return {'geometry' : self.__get_dynamic_attr('item_geometry', item)}