package net.alessandropetrozzelli;
class InvalidISINCharacterException
extends Exception {
InvalidISINCharacterException() {
super();
}
InvalidISINCharacterException(String s) {
super(s);
}
}
public class Isin {
static final int numberTableOffset = '0';
static final int numberTableEndOffset = '9';
static final int charTableOffset = 'A';
static final int charTableEndOffset = 'Z';
private static int getIntValueForISINChar(final char c) throws
InvalidISINCharacterException {
int value = 0;
if ( (c >= numberTableOffset) && (c <= numberTableEndOffset)) {
value = c - numberTableOffset;
}
else if ( (c >= charTableOffset) && (c <= charTableEndOffset)) {
value = 10 + (c - charTableOffset);
}
else {
throw new InvalidISINCharacterException("Unsupported character: " + c);
}
return value;
}
private static int getSumOfDigits(final int number) {
int sumOfDigits=0;
if (number<=9) {
sumOfDigits = number;
} else {
String s = String.valueOf(number);
try {
for (int i = 0; i < s.length(); i++) {
sumOfDigits += getIntValueForISINChar(s.charAt(i));
}
}
catch (InvalidISINCharacterException ex) {
System.out.println(ex);
return -1;
}
}
return sumOfDigits;
}
public static int getCheckDigit(final String isin) {
int checkDigit = 0;
if ( (isin == null) || (isin.length() != 11)) {
return -1;
}
String incompleteISINcode = isin.toUpperCase();
StringBuffer buffer = new StringBuffer();
// convert every single character into number as specified
try {
for (int i = 0; i < incompleteISINcode.length(); i++) {
buffer.append(getIntValueForISINChar(isin.charAt(i)));
}
}
catch (InvalidISINCharacterException ex) {
System.out.println(ex);
return -1;
}
// sum all digits (multiplying odd digits by 2)
try {
for (int i = buffer.length() - 1; i >= 0; i--) {
if ( (buffer.length() - i) % 2 == 1) {
checkDigit += getSumOfDigits(getIntValueForISINChar(buffer.charAt(i)) * 2);
}
else {
checkDigit += getIntValueForISINChar(buffer.charAt(i));
}
}
}
catch (InvalidISINCharacterException ex) {
// this should never happen
System.out.println(ex);
return -1;
}
// end result
checkDigit = (10 - (checkDigit % 10)) % 10;
return checkDigit;
}
Refactorings
No refactoring yet !
Vime
November 8, 2007, November 08, 2007 14:30, permalink
2 ratings.
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Just a refactoring for getIntValueForISINChar for now :)
private static int getIntValueForISINChar(final char c) throws
InvalidISINCharacterException {
switch( Character.getType() )
{
case DECIMAL_DIGIT_NUMBER :
return c - '0';
case UPPERCASE_LETTER :
return 10 + (c - 'A');
default :
throw new InvalidISINCharacterException("Unsupported character: " + c);
}
return 0;
}
Vime
November 8, 2007, November 08, 2007 14:54, permalink
1 rating.
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sorry, Character.getType(c)
olivier.fayau.myopenid.com
November 12, 2007, November 12, 2007 23:42, permalink
1 rating.
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Found on german wikipedia :-p
http://de.wikipedia.org/wiki/International_Securities_Identification_Number
Should check if char > 'Z' ...
package net.alessandropetrozzelli;
public class Isin {
public static int getCheckDigit(String src) {
int s = 0;
int a = (src.length() == 12) ? 1 : 2;
for (int i = src.length() - 1; i >= 0; i--) {
int c = src.charAt(i);
if (c > '9') {
// Character
c -= ('A' - 10);
s += (3 - a) * (c / 10) + a * c + (a - 1) * (c % 10) / 5;
} else {
// Number
c -= '0';
s += a * c + (a - 1) * (c / 5);
a = 3 - a;
}
}
s %= 10;
return (10 - s % 10) % 10;
}
}
based on http://en.wikipedia.org/wiki/International_Securities_Identifying_Number