Created
March 13, 2020 14:41
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StateパターンのPythonコード
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| class State(): | |
| """Stateパターンの抽象クラス | |
| """ | |
| def action(self): | |
| """動作メソッド | |
| Returns: | |
| None | |
| """ | |
| raise NotImplementedError("action()は抽象メソッドでござる") | |
| def greeting(self): | |
| """挨拶メソッド | |
| Returns: | |
| None | |
| """ | |
| raise NotImplementedError("greeting()は抽象メソッドでござる") | |
| class TheBeginningOfTheDay(State): | |
| """Stateパターンの具象クラス。（朝クラス） | |
| """ | |
| def __init__(self): | |
| """コンストラクタ | |
| """ | |
| self.action_name = "起きる" | |
| self.greeting_word = "おはよう" | |
| def action(self): | |
| """動作メソッド | |
| Returns: | |
| None | |
| """ | |
| print(self.action_name) | |
| def greeting(self): | |
| """挨拶メソッド | |
| Returns: | |
| None | |
| """ | |
| print(self.greeting_word) | |
| class TheEndOfTheDay(State): | |
| """Stateパターンの具象クラス。（夜クラス） | |
| """ | |
| def __init__(self): | |
| """コンストラクタ | |
| """ | |
| self.action_name = "寝る" | |
| self.greeting_word = "おやすみ" | |
| def action(self): | |
| """動作メソッド | |
| Returns: | |
| None | |
| """ | |
| print(self.action_name) | |
| def greeting(self): | |
| """挨拶メソッド | |
| Returns: | |
| None | |
| """ | |
| print(self.greeting_word) | |
| class Context: | |
| """StateパターンのContextクラス | |
| """ | |
| def __init__(self): | |
| """コンストラクタ | |
| """ | |
| self.the_beginning_of_the_day = TheBeginningOfTheDay() | |
| self.the_end_of_the_day = TheEndOfTheDay() | |
| self.state = self.the_beginning_of_the_day | |
| def change_state(self, scene): | |
| """State変更メソッド | |
| Args: | |
| scene (str): 昼または夜 | |
| Returns: | |
| None | |
| """ | |
| if scene == "一日の始まり": | |
| self.state = self.the_beginning_of_the_day | |
| elif scene == "一日の終わり": | |
| self.state = self.the_end_of_the_day | |
| else: | |
| raise ValueError() | |
| def action(self): | |
| """動作メソッド | |
| Returns: | |
| None | |
| """ | |
| self.state.action() | |
| def greeting(self): | |
| """挨拶メソッド | |
| Return: | |
| None | |
| """ | |
| self.state.greeting() | |
| def main(): | |
| print("<<一日の始まり>>") | |
| context = Context() | |
| context.action() | |
| context.greeting() | |
| print("===") | |
| print("<<一日の終わり>>") | |
| context.change_state("一日の終わり") | |
| context.greeting() | |
| context.action() | |
| if __name__ == "__main__": | |
| main() |
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