Remove HashMap Key from String

Question

I have mobile numbers in database table column, in a format of

country_code

followed by

mobile_number

So Mobile Number format is like this,

+91123456789 // country code of India is +91 followed by mobile number

+97188888888 // Country code of UAE +971

I have one HashMap containing CountryCodes of 5 countries like this,

map.put("+91","India")

map.put("+94","Sri Lanka")

map.put("+881","Bangladesh")

map.put("+971","UAE")

map.put("+977","Nepal")

My Bean Structure is something like this

class UserDetails {



  // other fields

   String countryCode;

   String mobileNumber;

}

Now my task is to take the mobile number from Database table column and split it in two parts and set

countryCode

and

mobileNumber

, but country code length(in map's key) varies between 3 and 4. This checking can be done by using

subString()

and

equals()

but I don't think it's correct way, So what would be the elegant(may be checking in

map key

) way to solve this issue?

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Answer 1

IMHO a single map is better. An example;

public static void main(String args[]) throws Exception {
    Map<String, String> map = new HashMap<>();
    put(map, "+91", "India");
    put(map, "+94", "Sri Lanka");
    put(map, "+881", "Bangladesh");
    put(map, "+971", "UAE");
    put(map, "+977", "Nepal");
    map = Collections.unmodifiableMap(map);

    String mobileNumber = "+91123456789";
    System.out.println(countryCode(map.keySet(), mobileNumber));
}

private static void put(Map<String, String> map, String key, String value) {
    if (countryCode(map.keySet(), key) != null) {
        throw new IllegalArgumentException("...");
    }
    map.put(key, value);
}

public static String countryCode(Set<String> countryCodes, String number) {
    if (number == null || number.length() < 3) {
        throw new IllegalArgumentException("...");
    }
    String code = number.substring(0, 3);
    if (!countryCodes.contains(code)) {
        if (number.length() > 3) {
            code = number.substring(0, 4);
            if (!countryCodes.contains(code)) {
                code = null;
            }
        } else {
            code = null;
        }
    }
    return code;
}

Remove HashMap Key from String

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