Reduce Cyclomatic Complexity of Switch Statement - Sonar

Question

I want to reduce cyclomatic complexity of my switch case my code is :

public String getCalenderName() {
        switch (type) {
    case COUNTRY:
        return country == null ? name : country.getName() + HOLIDAY_CALENDAR;
    case CCP:
        return ccp == null ? name : ccp.getName() + " CCP" + HOLIDAY_CALENDAR;
    case EXCHANGE:
        return exchange == null ? name : exchange.getName() + HOLIDAY_CALENDAR;
    case TENANT:
        return tenant == null ? name : tenant.getName() + HOLIDAY_CALENDAR;
    default:
        return name;
    }
}

This code blocks complexity is 16 and want to reduce it to 10. country, ccp, exchange and tenant are my diffrent objects. Based on type I will call their respective method.

Answer 1

I believe it is a Sonar warning. I think Sonar warnings are not must-do-rules, but just guides. Your code block is READABLE and MAINTAINABLE as it is. It is already simple, but if you really want to change it you can try those two approaches below, and see if complexity becomes lower:

Note: I don't have compiler with me now so there can be errors, sorry about that in advance.

First approach:

Map<String, String> multipliers = new HashMap<String, Float>();
    map.put("country", country);
    map.put("exchange", exchange);
    map.put("ccp", ccp);
    map.put("tenant", tenant);

Then we can just use the map to grab the right element

    return map.get(type) == null ? name : map.get(type).getName() + HOLIDAY_CALENDAR;

2nd approach:

All your objects have same method, so you can add an Interface with getName() method in it and change your method signature like:

getCalendarName(YourInterface yourObject){
    return yourObject == null ? name : yourObject.getName() + HOLIDAY_CALENDAR;
}