command 패턴

명령들을 추상화해서 class로 만들어 객체로 사용하는 패턴

class Command:
  def execute(self):
    pass

class PrintCommand(Command):
  def __init__(self, print_str:str):
    self.print_str = print_str
  
  def execute(self):
    print(f"from print command : {self.print_str}")

from typing import List

class Dog:
  def sit(self):
    print("The dog sat down")
  def stay(self):
    print("The dog is staying")


class DogCommand(Command):
  #prefer enums
  def __init__(self, dog:Dog,commands:List[str]):
    self.dog = dog
    self.commands = commands
  def execute(self):
    for command in self.commands:
      if command == 'sit':
        self.dog.sit()
      elif command == 'stay':
        self.dog.stay()
        
class Invoker:
  def __init__(self):
    self.command_list = []

  def addCommand(self, command:Command):
    self.command_list.append(command)

  def runCommands(self):
    for command in self.command_list:
      command.execute()