Replace exception with conditional · Los Techies

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18 August, 2009. It was a Tuesday.

Today’s refactoring doesn’t come from any place specifically, just something I’ve picked up over time that I find myself using often. Any variations/comments would be appreciated to this approach. I think there’s some other good refactorings around these type of problems.

A common code smell that I come across from time to time is using exceptions to control program flow. You may see something to this effect:

1: public class Microwave

2: {

3: private IMicrowaveMotor Motor { get; set;}

4: 

5: public bool Start(object food)

6: {

7: bool foodCooked = false;

8: try

9: {

10: Motor.Cook(food);

11: foodCooked = true;

12: }

13: catch(InUseException)

14: {

15: foodcooked = false;

16: }

17: 

18: return foodCooked;

19: }

20: }

Exceptions should only be there to do exactly what they are for, handle exceptional behavior. Most of the time you can replace this type of code with a proper conditional and handle it properly. This is called design by contract in the after example because we are ensuring a specific state of the Motor class before performing the necessary work instead of letting an exception handle it.

1: public class Microwave

2: {

3: private IMicrowaveMotor Motor { get; set; }

4: 

5: public bool Start(object food)

6: {

7: if (Motor.IsInUse)

8: return false;

9: 

10: Motor.Cook(food);

11: 

12: return true;

13: }

14: }

This is part of the 31 Days of Refactoring series. For a full list of Refactorings please see the original introductory post.

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