Tuesday, January 1, 2008

picture button - HASA^ISA

Q: In real world, given a family of button objects/interfaces, perhaps in an inheritance hierarchy, and a family of picture objects/interfaces, how do you provide a button with a picture on it. Use ISA and then use HASA

Design 1: MyButton extends Button, and has-a pointer to an abstract picture type.

Design 2 -- ISA: MyButton extends Button implements Picture => implements some of the Picture.java methods.
The existing environment may favor this design if Picture.java interface is the only thing there is, and everyone implements it and no one extends it.

Design 3: dependency injection. a container containing 2 pointers to a button and a picture. Most flexible. An end-user can choose the picture/button at run time and our class could setPic() and setButton() at run-time.

How about visitor pattern linking the 2 families?

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