61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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import six
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@six.add_metaclass(abc.ABCMeta)
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class ComparableObject(object):
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"""Superclass for objects, that should be comparable.
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Note: because python3 does not support __cmp__ slot, use
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cmp method to implement all of compare methods.
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"""
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@abc.abstractmethod
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def cmp(self, other):
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"""Compares with other object.
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:return: value is negative if if self < other, zero if self == other
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strictly positive if x > y
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"""
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def __lt__(self, other):
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return self.cmp(other) < 0
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def __le__(self, other):
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return self.cmp(other) <= 0
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def __gt__(self, other):
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return self.cmp(other) > 0
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def __ge__(self, other):
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return self.cmp(other) >= 0
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def __eq__(self, other):
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if other is self:
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return True
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return isinstance(other, type(self)) and self.cmp(other) == 0
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def __ne__(self, other):
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if other is self:
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return False
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return not isinstance(other, type(self)) or self.cmp(other) != 0
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def __cmp__(self, other):
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return self.cmp(other)
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