By Christopher G. Lasater
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There are two solutions for this problem, and each is covered in its own solution section that follows. Read both sections before making your factory decision. The first uses reflected types to determine the accepted classes for the workflow. The second uses inheritance to accomplish the same goal. The first solution is something that is widely used in factories of all types in many different coding languages. Our second solution is closer to the original adaptation of the pattern by the Gang of Four.
Basically, reflection is a way to look at your class types through a run-time API and determine their location, structure, and type. Using reflection in code can be a useful tool. If you want a looser coupling of code bases, reflection can be a key component to providing this functionality. Creating classes without defining their type until run time is useful in many ways. If you did not have reflection methods in your language API, doing this would be hard, if not impossible. Reflection can be used in place of compiled code relationships to make your code more dynamic.
AbstractFactory +CreateProduct() ConcreteFactoryA ProductA +CreateProduct() Product ConcreteFactoryB ProductB +CreateProduct() Figure 2-5. UML for Abstract Factory pattern 42 Chapter 2 Abstract Factory Pattern For our real-world code problem for this pattern we have a class that, depending on its type, needs a different factory to fill its attributes. Let’s say we also might want to be able to uniformly define which creation methods we can call on each factory in order to provide a common structure between factory implementations.