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View File Name : models.py

"""Utilities for defining models
"""

import operator
from typing import Any, Callable, Type


class KeyBasedCompareMixin:
    """Provides comparison capabilities that is based on a key"""

    __slots__ = ["_compare_key", "_defining_class"]

    def __init__(self, key: Any, defining_class: Type["KeyBasedCompareMixin"]) -> None:
        self._compare_key = key
        self._defining_class = defining_class

    def __hash__(self) -> int:
        return hash(self._compare_key)

    def __lt__(self, other: Any) -> bool:
        return self._compare(other, operator.__lt__)

    def __le__(self, other: Any) -> bool:
        return self._compare(other, operator.__le__)

    def __gt__(self, other: Any) -> bool:
        return self._compare(other, operator.__gt__)

    def __ge__(self, other: Any) -> bool:
        return self._compare(other, operator.__ge__)

    def __eq__(self, other: Any) -> bool:
        return self._compare(other, operator.__eq__)

    def _compare(self, other: Any, method: Callable[[Any, Any], bool]) -> bool:
        if not isinstance(other, self._defining_class):
            return NotImplemented

        return method(self._compare_key, other._compare_key)