By Christopher G. Lasater
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Additional info for Design Patterns
If you want a class to have freshly initialized data every time you call an instance from the factory, create a new class with every call to the factory. If, on the other hand, you would like to maintain the state of your classes 32 Chapter 2 Factory Pattern Finally, let’s look at where and how in your legacy code the factory can be implemented, replacing the existing conditional logic code used in different places. First, we must declare the particular instance of the factory we need. Next, we register only the needed class types we wish to return from the factory.
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. Solution 2a: Replace conditional logic with a class activator, using reflection to determine the needed types for different workflows Encapsulating the logic into a single location inside the SuitFactory class solves the issue of maintaining multiple code bases for the same logic, but we still have a lot of conditional Boolean logic code inside the factory that deals with the creational process.
StripedBusinessSuit, typeof (StripedBusinessSuit)); We only define the classes for the current workflow of the factory. This prevents unwanted functionality from appearing during the current workflow. The way we define the classes allowed inside the factory gives us flexibility to change our workflow for each implementation of the factory without changing the internal factory code. StripedBusinessSuit Thus we have illustrated how we can use reflection to help us build our class implementations of Suit.