Swedish Organisation number / SSN validator

README.md

Swedish Organisation Number / Social Security Number validator

It uses the modulo 10 (Luhn) algorithm to check that the organisation number is valid, is a company / person, is a male or is a co ordination number.

• http://en.wikipedia.org/wiki/Luhn_algorithm

IdNumberValidator.java

package util;

import org.apache.commons.lang3.StringUtils;

public class IdNumberValidator {

	// Invalid Result is used as a return value when the test fails
	private static final IdNumberValidatorResult invalid = new IdNumberValidatorResult();

	public static IdNumberValidatorResult validate(String value) {

		// Check for nulls and false lengths
		if (value == null || StringUtils.IsEmpty(value) ||  value.length() < 10) {
			return invalid;
		}

		try {
			// Remove dash and plus
			value = value.trim().replace("-", "").replace("+", "");

			String century = "";

			// Remove century and check number
			if (value.length() == 12) {
				century = value.substring(0, 2);
				value = value.substring(2, 12);
			} else if (value.length() == 10) {
				value = value.substring(0, 10);
			} else {
				return invalid;
			}
			// Remove check number
			int check = Integer.parseInt(value.substring(9, 10));
			String sValue = value.substring(0, 9);

			int result = 0;

			// Calculate check number
			for (int i = 0, len = sValue.length(); i < len; i++) {
				int tmp = Integer.parseInt(sValue.substring(i, i+1));

				if ((i % 2) == 0) {
					tmp = (tmp * 2);
				}

				if (tmp > 9) {
					result += (1 + (tmp % 10));
				} else {
					result += tmp;
				}
			}

			boolean isValid = (((check + result) % 10) == 0);
			boolean isSSN = Integer.parseInt(value.substring(2, 4), 10) < 13 && Integer.parseInt(value.substring(4, 6), 10) < 32;
			boolean isCoOrdinationNumber = Integer.parseInt(value.substring(4, 6), 10) > 60;
			boolean isMale = !((Integer.parseInt(value.substring(8, 9)) % 2) == 0);
			boolean isCompany = Integer.parseInt(value.substring(2, 4), 10) >= 20;

			return new IdNumberValidatorResult(isSSN ? century + value : value, isValid, isSSN, isCoOrdinationNumber, isMale, isCompany);
		} catch (NumberFormatException ex) {
			ex.printStackTrace();
		}
		return invalid;
	}
}

IdNumberValidatorResult.java

package util;

public class IdNumberValidatorResult {
	private String idno = null;
	private boolean valid = false;
	private boolean ssn = false;
	private boolean coOrdinationNumber = false;
	private boolean male = true;
	private boolean company = false;

	public String getIdno() {
		return idno;
	}

	public boolean isValid() {
		return valid;
	}

	public boolean isSSN() { return ssn; }

	public boolean isCoOrdinationNumber() { return coOrdinationNumber; }

	public boolean isMale() {
		return male;
	}

	public boolean isCompany() {
		return company;
	}

	public IdNumberValidatorResult() {}

	public IdNumberValidatorResult(String idno, boolean valid, boolean ssn, boolean coOrdinationNumber, boolean male, boolean company) {
		this.idno = idno;
		this.valid = valid;
		this.ssn = ssn;
		this.coOrdinationNumber = coOrdinationNumber;
		this.male = male;
		this.company = company;
	}
}

Very awesome and usefull! Thanks!