app/django/contrib/gis/db/backend/base.py
author Sverre Rabbelier <sverre@rabbelier.nl>
Mon, 07 Sep 2009 20:27:37 +0200
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"""
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 This module holds the base `SpatialBackend` object, which is
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 instantiated by each spatial backend with the features it has.
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"""
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# TODO: Create a `Geometry` protocol and allow user to use
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# different Geometry objects -- for now we just use GEOSGeometry.
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from django.contrib.gis.geos import GEOSGeometry, GEOSException
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class BaseSpatialBackend(object):
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    Geometry = GEOSGeometry
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    GeometryException = GEOSException
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    def __init__(self, **kwargs):
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        kwargs.setdefault('distance_functions', {})
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        kwargs.setdefault('limited_where', {})
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        for k, v in kwargs.iteritems(): setattr(self, k, v)
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    def __getattr__(self, name):
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        """
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        All attributes of the spatial backend return False by default.
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        """
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        try:
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            return self.__dict__[name]
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        except KeyError:
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            return False
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