Design Patterns discussion

["Clint Shank" <clintshank AT hotmail.com>]

I don't have my book on hand, but I think it says (or should say) that 
client code won't instantiate objects directly like this:

ProductA = new Product1A();

Instead, you do:

ProductA = factory.createProductA();

The point is that you won't have to go through you client code and change 
all the direct instantiations when you want to switch product families.  
Just the factory object used changes.

Clint Shank


> From: "Sayan Mukherjee" 
> <sayanmukherjee AT indiatimes.com>
> Reply-To: "Sayan 
> Mukherjee"<sayanmukherjee AT indiatimes.com>
> To: 
> <gang-of-4-patterns AT cs.uiuc.edu>
> Subject: [gang-of-4-patterns] Question on Abstract Factory
> Date: Fri, 29 Aug 2003 18:17:18 +0530
>
> Hi,
>
> In the Design Patterns book by GoF, it says that
> the reference to the AbstractProduct (or
> ConcreteProduct) never occurs in the client code.
> Clients will only call the CreateXXX() methods
> from the concrete factory classes.
>
> Then how will the client use the objects that the CreateXXX() methods 
> construct?
>
> I am assuming the following relationships:
>
> AbsractFactory (interface)
>   CreateProductA() (signature only)
>   CreateProductB() (     -do-     )
>
> ConcreteFactory1 (class) implements AbsractFactory
>   Implementations of the CreateXXX() methods
>   are here.
>   Supposed to create Product1A and Product1B
>   objects.
>
> ConcreteFactory2 (class) implements AbsractFactory
>   Implementations of the CreateXXX() methods are
>   here.
>   Supposed to create Product2A and Product2B
>   objects.
>
> Sayan Mukherjee
> [Email: 
> sayanmukherjee AT indiatimes.com]
>
>
>
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