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"""
Defines lookup classes to be used in ResultSet's filter method.
"""
registry = {}
class Lookup:
lookup_name = None
def __init_subclass__(cls, **kwargs):
super().__init_subclass__(**kwargs)
registry[cls.lookup_name] = cls()
def __call__(self, resource_value, requested_value):
raise NotImplementedError
class Exact(Lookup):
lookup_name = 'exact'
def __call__(self, resource_value, requested_value):
return resource_value == requested_value
class In(Lookup):
lookup_name = 'in'
def __call__(self, resource_value, requested_values):
return resource_value in requested_values
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