1 """

     2 This module holds simple classes used by GeoQuery.convert_values

     3 to convert geospatial values from the database.

     4 """

     5 from django.contrib.gis.db.backend import SpatialBackend

     6 

     7 class BaseField(object):

     8     def get_internal_type(self):

     9         "Overloaded method so OracleQuery.convert_values doesn't balk."

    10         return None

    11 

    12 if SpatialBackend.oracle: BaseField.empty_strings_allowed = False

    13 

    14 class AreaField(BaseField):

    15     "Wrapper for Area values."

    16     def __init__(self, area_att):

    17         self.area_att = area_att

    18 

    19 class DistanceField(BaseField):

    20     "Wrapper for Distance values."

    21     def __init__(self, distance_att):

    22         self.distance_att = distance_att

    23 

    24 class GeomField(BaseField):

    25     """

    26     Wrapper for Geometry values.  It is a lightweight alternative to 

    27     using GeometryField (which requires a SQL query upon instantiation).

    28     """

    29     pass