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47 lines
1.3 KiB
47 lines
1.3 KiB
"""Utilities for defining models |
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""" |
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import operator |
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from typing import Any, Callable, Type |
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class KeyBasedCompareMixin: |
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"""Provides comparison capabilities that is based on a key""" |
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__slots__ = ["_compare_key", "_defining_class"] |
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def __init__(self, key, defining_class): |
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# type: (Any, Type[KeyBasedCompareMixin]) -> None |
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self._compare_key = key |
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self._defining_class = defining_class |
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def __hash__(self): |
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# type: () -> int |
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return hash(self._compare_key) |
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def __lt__(self, other): |
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# type: (Any) -> bool |
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return self._compare(other, operator.__lt__) |
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def __le__(self, other): |
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# type: (Any) -> bool |
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return self._compare(other, operator.__le__) |
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def __gt__(self, other): |
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# type: (Any) -> bool |
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return self._compare(other, operator.__gt__) |
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def __ge__(self, other): |
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# type: (Any) -> bool |
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return self._compare(other, operator.__ge__) |
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def __eq__(self, other): |
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# type: (Any) -> bool |
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return self._compare(other, operator.__eq__) |
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def _compare(self, other, method): |
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# type: (Any, Callable[[Any, Any], bool]) -> bool |
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if not isinstance(other, self._defining_class): |
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return NotImplemented |
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return method(self._compare_key, other._compare_key)
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