Refactoring/BigRefactorings

Chapter 12 Big Refactorings

Tease Apart Inheritance

• You have an inheritance hierarchy that is doing two jobs at once.
  Create two hierarchies and use delegation to invoke one from the other.

http://zeropage.org/~reset/zb/data/TeaseApartInheritance.gif

Convert Procedural Design to Objects

• You have code written in a procedural style.
  Turn the date records into objects, break up the behavior, and move the behavior to the objects.

http://zeropage.org/~reset/zb/data/ConvertProceduralDesignToObjects.gif

Separate Domain from Presentation

• You have GUI classes that contain domain logic.
  Separate the domain logic into separate domain classes.

http://zeropage.org/~reset/zb/data/SeparateDomainFromPresentation.gif

Extract Hierarchy

• You have a class that is doing too much work, at least in part through many conditional statements.
  Create a hierarchy of classes in which each subclass represents a special case.

http://zeropage.org/~reset/zb/data/ExtractHierarchy.gif

---

Refactoring