Question

Greetings,

I have a servlet which pulls an “action” parameter from a querystring. Based on this string I perform the required action.

What is the best way to check the value of the “action” parameter. Currently my code is a long if, else if, else if, else if…when I’d rather have some kind of mapping from string to method where I didn’t have so many branch conditions.

Regards,

Ken

Answer 1

Populate a Map<String, Action> where String represents the condition for which you would like to grab the action and Action is the interface which you’ve definied for your actions.

E.g.

Action action = actions.get(request.getMethod() + request.getPathInfo());
if (action != null) {
    action.execute(request, response);
}

You can find a detailed example in this answer.