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Command/python/Command.py
94 строки
2 KB
georgedem
Command
06 авг 2022, 01:26
06 авг 2022, 01:26
8478bc3
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import abc from typing import List, Deque class ICommand(metaclass=abc.ABCMeta): @abc.abstractmethod def positive(self): pass @abc.abstractmethod def negative(self): pass class Conveyor: def on(self): print('the pipeline is running') def off(self): print('the conveyor is stopped') def speed_increase(self): print('increased conveyor speed') def speed_decrease(self): print('reduced conveyor speed') class ConveyorWorkCommand(ICommand): def __init__(self, conveyor: Conveyor): self.conveyor: Conveyor = conveyor def positive(self): self.conveyor.on() def negative(self): self.conveyor.off() class ConveyorAdjustCommand(ICommand): def __init__(self, conveyor: Conveyor): self.conveyor: Conveyor = conveyor def positive(self): self.conveyor.speed_increase() def negative(self): self.conveyor.speed_decrease() class Multipult: def __init__(self): self.__commands: List[ICommand] = [None, None] self.__history: Deque[ICommand] = [] def set_command(self, button: int, command: ICommand): self.__commands[button] = command def press_on(self, button: int): self.__commands[button].positive() self.__history.append(self.__commands[button]) def press_cancel(self): if len(self.__history) != 0: self.__history.pop().negative() if __name__ == '__main__': conveyor = Conveyor() multipult = Multipult() multipult.set_command(0, ConveyorWorkCommand(conveyor)) multipult.set_command(1, ConveyorAdjustCommand(conveyor)) multipult.press_on(0) multipult.press_on(1) multipult.press_cancel() multipult.press_cancel()