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don't be afraid of buying books
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Encapsulate Classes with Factory
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Clients directly instantiate classes that reside in one package and implement a common interface
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Make the class constructors non-public and let clients create instances of them using a Factory
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Motivation
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A client's ability to directly instantiate classes is useful so long as the client needs to know about the very existence of those classes But what if the client doesn't need that knowledge What if the classes live in one package and implement one interface, and those conditions aren't likely to change In that case, the classes in the package could be hidden from clients outside the package by giving a Factory the responsibility of creating and returning instances that implement a common interface There are several motivations for doing this First, it provides a way to rigorously apply the mantra "program to an interface, not an
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implementation" [DP] by ensuring that clients interact with classes via their common interface Second, it provides a way to reduce the "conceptual weight" [Bloch] of a package by hiding classes that don't need to be publicly visible outside their package (ie, clients don't need to know these classes exist) And third, it simplifies the construction of available kinds of instances by making the set available through a Factory's intention-revealing Creation Methods The one major issue with this refactoring involves a dependency cycle: whenever you create a new subclass or add/modify an existing subclass constructor, you must add a new Creation Method to your Factory If you don't often add new subclasses or add/modify constructors to existing subclasses, this is not a problem If you do, you may wish to avoid this refactoring or transition to a design that lets clients directly instantiate whichever subclasses they like You can also consider a hybrid approach in which you produce a Factory for the most popular kinds of instances and don't fully encapsulate all of the subclasses so that clients may instantiate classes as needed Programmers who make their code available to others as binary code, not source code, may also wish to avoid this refactoring because it doesn't provide clients with the ability to modify encapsulated classes or the Factory's Creation Methods This refactoring can yield a class that behaves as both a Factory and an implementation class (ie, implementing non-creation-based methods) Some are comfortable with this mixture, while others aren't If you find that such a mixtures obscures the primary responsibility of a class, consider Extract Factory (66) The sketch at the start of this refactoring gives you a glimpse of some object-to-relational database mapping code Before the refactoring was applied, programmers (including myself) occasionally instantiated the wrong subclass or the right subclass with incorrect arguments (eg, we called a constructor that took a primitive Java int when we really needed to call the constructor that took Java's Integer object) The refactoring reduced our defect count by encapsulating the knowledge about the subclasses and producing a single place to get a variety of well-named subclass instances
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Benefits and Liabilities
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+ + + Simplifies the creation of kinds of instances by making the set available through intention-revealing methods Reduces the "conceptual weight" Bloch] of a package by hiding classes that don't need to be public [ Helps enforce the mantra "program to an interface, not an implementation" [ P] D Requires new/updated Creation Methods when new kinds of instances must be created Limits customization when clients can only access a Factory's binary code, not its source code
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Mechanics
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In general, you'll want to apply this refactoring when your classes share a common public interface, share the same superclass, and reside in the same package
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1 Find a client that calls a class's constructor in order to create a kind of instance Apply Extract Method [F] on the constructor call to produce a public, static method This new method is a creation method Now apply Move Method [F] to move the creation
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