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"""
A collection of utility routines and classes used by the spatial
backends.
"""
class SpatialOperator:
"""
Class encapsulating the behavior specific to a GIS operation (used by lookups).
"""
sql_template = None
def __init__(self, op=None, func=None):
self.op = op
self.func = func
@property
def default_template(self):
if self.func:
return "%(func)s(%(lhs)s, %(rhs)s)"
else:
return "%(lhs)s %(op)s %(rhs)s"
def as_sql(self, connection, lookup, template_params, sql_params):
sql_template = self.sql_template or lookup.sql_template or self.default_template
template_params.update({"op": self.op, "func": self.func})
return sql_template % template_params, sql_params