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A chain of routines passes tramp data Finding yourself passing data to one routine just so that routine can pass it to another routine is called tramp data (Page-Jones 1988). This might be OK, or it might not. Ask whether passing the specific data in question is consistent with the abstraction presented by each of the routine interfaces. If the abstraction for each routine is OK, passing the data is OK. If not, find some way to make each routine s interface more consistent. A middle man object isn t doing anything If you find that most of the code in a class is just passing off calls to routines in other classes, consider whether you should eliminate the middleman and call those other classes directly. One class is overly intimate with another Encapsulation (information hiding) is probably the strongest tool you have to make your program intellectually manageable and to minimize ripple effects of code changes. Anytime you see one class that knows more about another class than it should (including derived classes knowing too much about their parents), err on the side of stronger encapsulation rather than weaker. A routine has a poor name If a routine has a poor name, change the name of the routine where it s defined, change the name in all places it s called, and then recompile. As hard as it might be to do this now, it will be even harder later, so do it as soon as you notice it s a problem. Data members are public Public data members are, in my view, always a bad idea. They blur the line between interface and implementation. They inherently violate encapsulation and limit future flexibility. Strongly consider hiding public data members behind access routines. A subclass uses only a small percentage of its parents routines Typically this indicates that that subclass has been created because a parent class happened to contain the routines it needed, not because the subclass is logically a descendent of the superclass. Consider achieving better encapsulation by switching the subclass s relationship to its superclass from an is-a relationship to a has-a relationship; convert the superclass to member data of the former subclass and expose only the routines in the former subclass that are really needed. Comments are used to explain difficult code Comments have an important role to play, but they should not be used as a crutch to explain bad code. The age-old wisdom is dead on: Don t document bad code rewrite it (Kernighan and Plauger 1978).
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Global variables are used When you revisit a section of code that uses global variables, take time to reexamine them. You might have thought of a way to avoid using global variables since the last time you visited that part of the code. Because you re less familiar with the code than when you first wrote it, you might now find the global variables sufficiently confusing that you re willing to develop a cleaner approach. You might also have a better sense of how to isolate global variables in access routines and a keener sense of the pain caused by not doing so. Bite the bullet and make the beneficial modifications. The initial coding will be far enough in the past that you can be objective about your work yet close enough that you will still remember most of what you need in order to make the revisions correctly. The time during early revisions is the perfect time to improve the code. A routine uses setup code before a routine call or takedown code after a routine call Code like this is a warning:
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WithdrawalTransaction withdrawal; withdrawal.SetCustomerId( customerId ); withdrawal.SetBalance( balance ); withdrawal.SetWithdrawalAmount( withdrawalAmount ); withdrawal.SetWithdrawalDate( withdrawalDate ); ProcessWithdrawal( withdrawal ); customerId = withdrawal.GetCustomerId(); balance = withdrawal.GetBalance(); withdrawalAmount = withdrawal.GetWithdrawalAmount(); withdrawalDate = withdrawal.GetWithdrawalDate();
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A similar warning sign is when you find yourself creating a special constructor for the WithdrawalTransaction class that takes a subset of its normal initialization data so that you can write code like this:
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withdrawal = new WithdrawalTransaction( customerId, balance, withdrawalAmount, withdrawalDate ); ProcessWithdrawal( withdrawal ); delete withdrawal;
Anytime you see code that sets up for a call to a routine or takes down after a call to a routine, ask whether the routine interface is presenting the right abstraction. In this case, perhaps the ProcessWithdrawal() routine should be added to the WithdrawalTransaction class, or perhaps the parameter list of ProcessWithdrawal should be modified to support code like this:
ProcessWithdrawal( balance, withdrawalAmount, withdrawalDate );
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