Replace the Ifs using design Pattern

Hi guys,.

I have a class that receives an error code and define an associated error message. So, to avoid the nested ifs, I'm looking for a solution using the model maibe.

{if (returnCode.Equals("052"))}
Errors.Add ("error", new ActionError ("error.msg", applicationResources.getMessage ("errors.myerror52")));

{if (returnCode.Equals("055"))}
Errors.Add ("error", new ActionError ("error.msg", applicationResources.getMessage ("errors.myerro55")));

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

For each new error code and your respective message, I need to add a new one if in the class...

I accept some suggestions to do is better!

Thank you very much!

There are a number of approaches you could take. The validity and the relative value of some of them depend on the question whether the return code is really a string or a number formatted as a string. on the question of if you call always just errors.add (), just with different arguments, or if you need take completely different measures in some cases; on return codes how there; How often the codes will be added, changed, or deleted.

1. a code card--> object encapsulating the args to errors.add (back)

2. order model, which could be carried like a map of return code--> instance of a class that implements how to handle this code, or code return--> object class or class name, which then is instantiated, and the new run object. In both cases, the object that performs the processing will implement an interface that you define.

3. a table whose index is the code back and whose value is an object, the object class or name of the class that handles this particular code.

4. an enum with each enumeration value with either a different set of fields must be passed to errors.add () or a different implementation of a method, if you do not simply call errors.add () for each code.

5. a switch statement on the return code, such as an int or an enum, or, if you are on Java 7, as a string.

A little regardless of which of the above approaches you take, you must decide if you want to hard-code the code--> action, or if you want to put it in a configuration file or the database mapping.

Tags: Oracle

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