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- """
- A collection of utility routines and classes used by the spatial
- backends.
- """
- class SpatialOperation(object):
- """
- Base class for generating spatial SQL.
- """
- sql_template = '%(geo_col)s %(operator)s %(geometry)s'
- def __init__(self, function='', operator='', result='', **kwargs):
- self.function = function
- self.operator = operator
- self.result = result
- self.extra = kwargs
- def as_sql(self, geo_col, geometry='%s'):
- return self.sql_template % self.params(geo_col, geometry), []
- def params(self, geo_col, geometry):
- params = {'function': self.function,
- 'geo_col': geo_col,
- 'geometry': geometry,
- 'operator': self.operator,
- 'result': self.result,
- }
- params.update(self.extra)
- return params
- class SpatialFunction(SpatialOperation):
- """
- Base class for generating spatial SQL related to a function.
- """
- sql_template = '%(function)s(%(geo_col)s, %(geometry)s)'
- def __init__(self, func, result='', operator='', **kwargs):
- # Getting the function prefix.
- default = {'function': func,
- 'operator': operator,
- 'result': result
- }
- kwargs.update(default)
- super(SpatialFunction, self).__init__(**kwargs)
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