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# -*- coding: utf-8 -*-
# EFILTER Forensic Query Language
#
# Copyright 2015 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""EFILTER abstract type system."""
import datetime
import numbers
import six
from efilter import dispatch
from efilter import protocol
# Declarations:
# pylint: disable=unused-argument
@dispatch.multimethod
def hashed(x):
raise NotImplementedError()
class IHashable(protocol.Protocol):
_required_functions = (hashed,)
# Default implementations:
IHashable.implement(for_types=six.string_types,
implementations={hashed: hash})
IHashable.implement(for_types=six.integer_types,
implementations={hashed: hash})
IHashable.implement(for_types=(numbers.Number, type(None), tuple, frozenset,
datetime.datetime),
implementations={hashed: hash})
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