Decorator Pattern with multiple concrete components











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Currently I want to implement a Decorator Pattern in a static language. Consider the following structure:



  Entity <-------- Decorator
^ ^ ^
| | |
| | |
Shape Group ConcreteDec


When I only have a ConcreteDec, I am unable to call Group.add(Entity), a function that is defined in Group, but isn't inherited from Entity. Shape isn't a class that could add anything; Shape can't have members, that wouldn't make sense. Inheriting add(Entity) from Entity in Shape wouldn't be an option.



Is there a way to call add(Entity) from ConcreteDec without breaking Shapenor the decorator pattern?










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    up vote
    0
    down vote

    favorite












    Currently I want to implement a Decorator Pattern in a static language. Consider the following structure:



      Entity <-------- Decorator
    ^ ^ ^
    | | |
    | | |
    Shape Group ConcreteDec


    When I only have a ConcreteDec, I am unable to call Group.add(Entity), a function that is defined in Group, but isn't inherited from Entity. Shape isn't a class that could add anything; Shape can't have members, that wouldn't make sense. Inheriting add(Entity) from Entity in Shape wouldn't be an option.



    Is there a way to call add(Entity) from ConcreteDec without breaking Shapenor the decorator pattern?










    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      Currently I want to implement a Decorator Pattern in a static language. Consider the following structure:



        Entity <-------- Decorator
      ^ ^ ^
      | | |
      | | |
      Shape Group ConcreteDec


      When I only have a ConcreteDec, I am unable to call Group.add(Entity), a function that is defined in Group, but isn't inherited from Entity. Shape isn't a class that could add anything; Shape can't have members, that wouldn't make sense. Inheriting add(Entity) from Entity in Shape wouldn't be an option.



      Is there a way to call add(Entity) from ConcreteDec without breaking Shapenor the decorator pattern?










      share|improve this question













      Currently I want to implement a Decorator Pattern in a static language. Consider the following structure:



        Entity <-------- Decorator
      ^ ^ ^
      | | |
      | | |
      Shape Group ConcreteDec


      When I only have a ConcreteDec, I am unable to call Group.add(Entity), a function that is defined in Group, but isn't inherited from Entity. Shape isn't a class that could add anything; Shape can't have members, that wouldn't make sense. Inheriting add(Entity) from Entity in Shape wouldn't be an option.



      Is there a way to call add(Entity) from ConcreteDec without breaking Shapenor the decorator pattern?







      decorator






      share|improve this question













      share|improve this question











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      share|improve this question










      asked Nov 10 at 22:07









      jallersma

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