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Class Implementation Refactorings
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Change value objects to reference objects If you find yourself creating and maintaining numerous copies of large or complex objects, change your usage of those objects so that only one master copy exists (the value object) and the rest of the code uses references to that object (reference objects).
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24. Refactoring
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Change reference objects to value objects If you find yourself performing a lot of reference housekeeping for small or simple objects, change your usage of those objects so that all objects are value objects. Replace virtual routines with data initialization If you have a set of subclasses that vary only according to constant values they return, rather than overriding member routines in the derived classes, have the derived classes initialize the class with appropriate constant values, and then have generic code in the base class that works with those values. Change member routine or data placement There are several general changes to consider making in an inheritance hierarchy. These changes are normally performed to eliminate duplication in derived classes:
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Pull a routine up into its superclass Pull a field up into its superclass Pull a constructor body up into its superclass
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Several other changes are normally made to support specialization in derived classes: Push a routine down into its derived classes Push a field down into its derived classes Push a constructor body down into its derived classes
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Extract specialized code into a subclass If a class has code that s used by only a subset of its instances, move that specialized code into its own subclass. Combine similar code into a superclass If two subclasses have similar code, combine that code and move it into the superclass.
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Move a routine to another class Create a new routine in the target class and move the body of the routine from the source class into the target class. You can either call the new routine from the old routine, or change surrounding code to use the new routine exclusively.
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24. Refactoring
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Convert one class to two If a class has two or more distinct areas of responsibility, break the class into multiple classes, each of which has a clearly defined responsibility. Eliminate a class If a class isn t doing very much, move its code into other classes that are more cohesive and eliminate the class. Hide a delegate Sometimes Class A calls Class B and Class C, when really Class A should call only Class B, and Class B should call Class C. Ask yourself what the right abstraction is for A s interaction with B. If B should be responsible for calling C, then have B call C. Replace inheritance with delegation If a class needs to use another class but wants more control over its interface, make the superclass a field of the former subclass and then expose a set of routines that will provide a cohesive abstraction. Replace delegation with inheritance If a class exposes every public routine of a delegate class (member class), inherit from the delegate class instead of just using the class. Remove a middle man If Class A calls B, and Class B calls Class C, sometimes it works better to have Class A call Class C directly. The question of whether you should delegate to Class B or not depends on what will best maintain the integrity of Class B s interface. Introduce a foreign routine If a class needs an additional routine and you can t modify the class to provide it, you can create a new routine within the client class that provides that functionality. Introduce an extension class If a class needs several additional routines and you can t modify the class, you can create a new class that combines the unmodifiable class s functionality with the additional functionality. You can do that either by subclassing the original class and adding new routines or by wrapping the class and exposing the routines you need. Encapsulate an exposed member variable If member data is public, change the member data to private and expose the member data s value through a routine instead.
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