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builder 모드 개요

클래스 및 시퀀스

실시 방침

# builder側
class AbstractBuilder:
 @abstractmethod
 def build_part1(self):
   pass
 @abstractmethod
 def build_part2(self):
   pass
 @abstractmethod
 def build_part3(self):
   pass

class ConcreteBuilder(AbstractBuilder):
 def build_part1(self):
   # 実処理を記載
   self.do_something() # 処理を実装
 def build_part2(self):
   # 実処理を記載
   self.do_something2() # 処理を実装
 def build_part3(self): 
   return self.get_product() # 処理を実装

# director側
class MyDirector: # 注目すべきは考え方なので、内部の実装は作成するものによる(あくまで一例)

   def construct(self):
     #生成手順を実装
    self.builder.build_part1()
    self.builder.build_part2()
    return self. builder.build_part3()

   @classmethod
   def create_director(cls, some_args: obj):
     builder_cls = get_builder_cls(some_args) # 処理を実装
     return cls(builder_cls())

# client側
def main():
 director =  MyDirector.create_director("some_args_for_deciding_builder_cls")
 product = director.construct() 

# director側
class AbstractDirector:
  @abstractmethod
  def construct(self):
    pass

  @abstractmethod
  def create_director(self):
    raise NotImplementedError()

  @classmethod
  def get_director_cls(cls, some_args: obj):
     director_cls = get_director_cls(some_args) # 処理を実装
     return director_cls

class MyDirector(AbstractDirector): 

   def construct():
     #生成手順を実装
    self.builder.build_part1()
    self.builder.build_part2()
    return self. builder.build_part3()

   @classmethod
   def create_director(cls,some_args: obj):
     builder_cls = get_builder_cls(some_args) # 処理を実装
     return cls(builder_cls())

class YourDirector(AbstractDirector): 

   def construct():
     #生成手順を実装
    self.builder.build_ex_part1()
    self.builder.build_ex_part2()
    return self.builder.build_ex_part3()

   @classmethod
   def create_director(cls,some_args: obj):
     builder_cls = get_builder_cls(some_args) # 処理を実装
     return cls(builder_cls())

# client側
def main():
 director_cls =  AbstractDirector.get_director_cls("some_args_1")
 director =  director_cls.create_director("some_args_2")
 product = director.construct() 

이점 및 용도