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7 Simplification
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Much of the code we write doesn't start out being simple To make it simple, we must reflect on what isn't simple about it and continually ask, "How could it be simpler " We can often simplify code by considering a completely different solution The refactorings in this chapter present different solutions for simplifying methods, state transitions, and tree structures Compose Method (123) is about producing methods that efficiently communicate what they do and how they do what they do A Composed Method [Beck, SBPP] consists of calls to well-named methods that are all at the same level of detail If you want to keep your system simple, endeavor to apply Compose Method (123) everywhere Algorithms often become complex as they begin to support many variations Replace Conditional Logic with Strategy (129) shows how to simplify algorithms by breaking them up into separate classes Of course, if your algorithm isn't sufficiently complicated to justify a Strategy [DP], refactoring to one will only complicate your design You probably won't refactor to a Decorator [DP] frequently Yet it is a great simplification tool for a certain situation: when you have too much special-case or embellishment logic in a class Move Embellishment to Decorator (144) describes how to identify when you really need a Decorator and then shows how to separate embellishments from the core responsibility of a class Logic for controlling state transitions is notorious for becoming complex This is especially true as you add more and more state transitions to a class The refactoring Replace State-Altering Conditionals with State (166) describes how to drastically simplify complex state transition logic and helps you determine whether your logic is complex enough to require a State [DP] implementation Replace Implicit Tree with Composite (178) is a refactoring that targets the complexity of building and working with tree structures It shows how a Composite [DP] can simplify a client's creation and interaction with a tree structure The Command pattern [DP] is useful for simplifying certain types of code The refactoringReplace Conditional Dispatcher with Command (191) shows how this pattern can completely simplify a switch statement that controls which chunk of behavior to execute
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Transform the logic into a small number of intention-revealing steps at the same level of detail
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Kent Beck once said that some of his best patterns are those that he thought someone would laugh at him for writing Composed Method [Beck, SBPP] may be such a pattern A Composed Method is a small, simple method that you can understand in seconds Do you write a lot of Composed Methods I like to think I do, but I often find that I don't, at first So I have to go back and refactor to this pattern When my code has many Composed Methods, it tends to be easy to use, read, and extend A Composed Method is composed of calls to other methods Good Composed Methods have code at the same level of detail For example, the code set in bold in the following listing is not at the same level of detail as the nonbold code: private void paintCard(Graphics g) {
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Image image = null; if (cardgetType()equals("Problem")) { image = explanationsgetGameUI()problem; } else if (cardgetType()equals("Solution")) { image = explanationsgetGameUI()solution; } else if (cardgetType()equals("Value")) { image = explanationsgetGameUI()value; } gdrawImage(image,0,0,explanationsgetGameUI());
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if (shouldHighlight()) paintCardHighlight(g); paintCardText(g); }
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By refactoring to a Composed Method, all of the methods called within the paintCard() method are now at the same level of detail: private void paintCard(Graphics g) { paintCardImage(g); if (shouldHighlight()) paintCardHighlight(g); paintCardText(g); }
Most refactorings to Composed Method involve applying Extract Method [F] several times until the Composed Method does most (if not all) of its work via calls to other methods The most difficult part is deciding what code to include or not include in an extracted method If you extract too much code into a method, you'll have a hard time naming the method to adequately describe what it does In that case, just apply Inline Method [F] to get the code back into the original method, and then explore other ways to break it up Once you finish this refactoring, you will likely have numerous small, private methods that are called by your Composed Method Some may consider such small methods to be a performance problem They are only a performance problem when a profiler says they are I rarely find that my worst performance problems relate to Composed Methods; they almost always relate to other coding problems If you apply this refactoring on numerous methods within the same class, you may find that the class has an overabundance of small, private methods In that case, you may see an opportunity to apply Extract Class [F]
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Another possible downside of this refactoring involves debugging If you debug a Composed Method, it can become difficult to find where the actual work gets done because the logic is spread out across many small methods A Composed Method's name communicates what it does, while its body communicateshow it does what it does This allows you to rapidly comprehend the code in a Composed Method When you add up all the time you and your team spend trying to understand a system's code, you can just imagine how much more efficient and effective you'll be if the system is composed of many Composed Methods