import java.math.BigInteger;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Serviceroutinen um Banknummer wie z.B. IBAN zu checken.
*
*/
public class BankingNumberValidation
{
final static private Set ISO_COUNTRY_CODES = new HashSet();
final static public int NOT_AN_IBAN = 0;
final static public int BAD_IBAN_CHECKNUM = 1;
final static public int GOOD_IBAN = 2;
final static public int EU_IBAN = 3;
final static public int NOT_A_BIC = 0;
final static public int GOOD_BIC = 1;
final static public int EU_BIC = 2;
final static private BigInteger BIG_INT_97 = new BigInteger("97");
final static private BigInteger BIG_INT_1 = new BigInteger("1");
final static private Pattern IBAN_PAT = Pattern.compile(("([A-Z]{2})([0-9]{2})([\\w]{1,30})"));
static
{
String[] cCodes = Locale.getISOCountries();
for (int i=0; i<cCodes.length; i++)
{
ISO_COUNTRY_CODES.add(cCodes[i]);
}
}
/**
* checks if the given IBAN seems to be an iban (without countrycode-check)
* and validates the checknumber
* this routine is a bit cheap but also fast since no country-codes are checked
*
* @param iban
* @return (int) NOT_AN_IBAN , if given String does not matche basic IBAN-format
* BAD_IBAN_CHECKNUM , if basic IBAN-format is OK but not the checknumber
* GOOD_IBAN , if basic IBAN-format and hecknumber are OK
*/
static public int isIBANCheckNumberOK(String iban)
{
int rc;
Matcher matcher = IBAN_PAT.matcher(iban);
if (matcher.matches())
{
StringBuffer ibanBuff = new StringBuffer(34);
StringBuffer valueBuff = new StringBuffer(34);
ibanBuff.append(matcher.group(3));
ibanBuff.append(matcher.group(1));
ibanBuff.append(matcher.group(2));
for(int i=0; i<ibanBuff.length(); i++)
{
int v;
char c =ibanBuff.charAt(i);
if ((c>='A' && c<='Z'))
{
v = c - 'A' + 10;
valueBuff.append(v);
}
else if ((c>='a' && c<='z'))
{
v = c - 'a' + 10;
valueBuff.append(v);
}
else
{
valueBuff.append(c);
}
}
BigInteger val = new BigInteger(valueBuff.toString());
rc = val.divideAndRemainder(BIG_INT_97)[1].equals(BIG_INT_1)? GOOD_IBAN : BAD_IBAN_CHECKNUM;
}
else
{
rc = NOT_AN_IBAN;
}
return rc;
}
/**
* checks if the given IBAN seems to be an iban with countrycode-check
* and validates the checknumber
* if this validation is allright it is checked whether the country-code is
* sorts to european regulations payment area or not
*
* the higher the returned value the better the IBAN so if you just want to know
* if the IBAN is allright but don't care about the european-area you just
* do something like this:
* <code>
* if (BankingNumberValidation.isIBAN(iban) >= GOOD_IBAN)
* {
* ... do something
* }
* </code>
*
* @param iban
* @return (int) NOT_AN_IBAN , if given String does not matche basic IBAN-format or countrycod is unkown
* BAD_IBAN_CHECKNUM , if basic IBAN-format and countrycode are OK but not the checknumber
* GOOD_IBAN , if basic IBAN-format, countrycode and checknumber are OK
* EU_IBAN , if basic IBAN-format, countrycode, checknumber are OK and the countrycode is european
*
* @see de.cmk.util.banking.EUCountryCodes.isIbanEUCountry
*/
static public int isIBAN(String iban)
{
int rc;
Matcher matcher = IBAN_PAT.matcher(iban);
if (matcher.matches() && ISO_COUNTRY_CODES.contains(iban.substring(0,2)))
{
StringBuffer ibanBuff = new StringBuffer(34);
StringBuffer valueBuff = new StringBuffer(34);
ibanBuff.append(matcher.group(3));
ibanBuff.append(matcher.group(1));
ibanBuff.append(matcher.group(2));
for(int i=0; i<ibanBuff.length(); i++)
{
int v;
char c =ibanBuff.charAt(i);
if ((c>='A' && c<='Z'))
{
v = c - 'A' + 10;
valueBuff.append(v);
}
else if ((c>='a' && c<='z'))
{
v = c - 'a' + 10;
valueBuff.append(v);
}
else
{
valueBuff.append(c);
}
}
BigInteger val = new BigInteger(valueBuff.toString());
if (val.divideAndRemainder(BIG_INT_97)[1].equals(BIG_INT_1))
{
if (EUCountryCodes.isIbanEUCountry(iban))
{
rc = EU_IBAN;
}
else
{
rc = GOOD_IBAN;
}
}
else
{
rc = BAD_IBAN_CHECKNUM;
}
}
else
{
rc = NOT_AN_IBAN;
}
return rc;
}
/**
* very simple formal check on given bic
* cheks if the countrycode is correct or even european
* assumes thta a bic is 11 or 8 characters long and
* an that the 4. and 5. offset is the country-code
* @param bic
* @return
*/
static public int isBIC(String bic)
{
int rc ;
if (bic.length()==11 || bic.length()==8)
{
if (EUCountryCodes.isBicEUCountry(bic))
{
rc = EU_BIC;
}
else if (ISO_COUNTRY_CODES.contains(bic))
{
rc = GOOD_BIC;
}
else
{
rc = NOT_A_BIC;
}
}
else
{
rc = NOT_A_BIC;
}
return rc;
}
public static void main(String argv[])
{
System.out.println(argv[0]+" isBIC:"+ isBIC(argv[0]));
System.out.println(argv[0]+" isIBAN:"+ isIBAN(argv[0]));
}
}
