| |
| |
| |
| |
| public class IbanValidator { |
|
|
| public static String normalize(String iban) { |
| if (iban == null) { |
| throw new IllegalArgumentException("IBAN boş olamaz"); |
| } |
| return iban.replace(" ", "").toUpperCase(); |
| } |
|
|
| public static boolean isValid(String iban) { |
| String s = normalize(iban); |
| if (s.length() != 26 || !s.startsWith("TR")) { |
| return false; |
| } |
| if (s.charAt(9) != '0') { |
| return false; |
| } |
| for (int i = 2; i < s.length(); i++) { |
| if (!Character.isDigit(s.charAt(i))) { |
| return false; |
| } |
| } |
| return mod97(s.substring(4) + s.substring(0, 4)) == 1; |
| } |
|
|
| static int mod97(String s) { |
| int r = 0; |
| for (char c : s.toCharArray()) { |
| int v = Character.isLetter(c) ? c - 'A' + 10 : c - '0'; |
| r = v >= 10 ? (r * 100 + v) % 97 : (r * 10 + v) % 97; |
| } |
| return r; |
| } |
|
|
| public static String bankCode(String iban) { |
| String s = normalize(iban); |
| if (!isValid(s)) { |
| throw new IllegalArgumentException("Geçersiz IBAN: " + iban); |
| } |
| return s.substring(4, 9); |
| } |
|
|
| |
| public static String format(String iban) { |
| String s = normalize(iban); |
| StringBuilder b = new StringBuilder(); |
| for (int i = 0; i < s.length(); i++) { |
| if (i > 0 && i % 4 == 0) { |
| b.append(' '); |
| } |
| b.append(s.charAt(i)); |
| } |
| return b.toString(); |
| } |
| } |
|
|
