What's the best alternative to an out of control switch statement?

Question

I have inherited a project that has some huge switch statement blocks, with some containing up to 20 cases. What is a good way to rewrite these?

Answer 1

Polymorphism. But it may not be a trivial refactoring.

Some examples and refs:

Refactoring (Googe books)

Switch Statement code smell and Polymorphism

Refactoring switch-statements