63 lines
1.9 KiB
Python
63 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 Mirantis, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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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