validator.java

webwork source

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.examples.userreg;

import java.net.InetAddress;
import java.net.UnknownHostException;

//import javax.mail.Address;

/**
 *	@author Kjetil H.Paulsen ([e-mail])
 *	@version $Revision: 1.3 $
 */

public class Validator {

   /** First multiplier used for social security number (norwegian) */
   private final static int[] SSN_MULTIPLIER =
           {3, 7, 6, 1, 8, 9, 4, 5, 2, 1, 0};

   /** Second multiplier used for social security numbers (norwegian) */
   private final static int[] CONTROL_NO_MULTIPLIER =
           {5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1};

   /** The number of digits in the number to be controlled */
   private final static int DIGIT_COUNT = 11;

   private Validator() {
   }

   public static boolean checkEmail(String email, boolean doNetCheck) {
      // do some checks, should have javax.mail available for this
      int index = email.indexOf('@');

      // the email have to contain the @ sign and there have to
      // be at least one character on the left side of it
      if ((index < 1) || ((index + 1) >= email.length())) {
         return false;
      }

      if (doNetCheck) {
         String host = email.substring(index + 1);
         try {
            InetAddress.getByName(host);
         } catch (UnknownHostException e) {
            return false;
         }
      }
      return true;

   }

   /**
    * @param ssn The social security number to check
    */
   public static boolean checkSsn(String ssn) {

      return ssn!=null && ssn.trim().length()>0; // haven't hade time to generate samples of control numbers you can use, so for now we return true
   }

   /**
    * This method checks if the SSN given is compliant with the gender given by the user.
    * Females: the 9th number is a odd number
    * Males:   the 9th number is an even number
    *
    * @param ssn The Norwegian social security number
    * @param male This is true if the user is a male
    */
   public static boolean checkSsnWithGenderCheck(String ssn, boolean male) {

      //if (isSSNMod11(ssn)) { // haven't hade time to generate samples of control numbers you can use, so for now we return true

         // check the 9th number for gender compliance
         int i = Integer.parseInt(ssn.substring(8, 9));
         i = i % 2;
         if ((i > 0) && male) {
            return true;
         } else if ((i == 0) && !male) {
            return true;
         }
      //}
      return false;

   }


   // not JavaDoc'et since not Webwork functionality
   /*
	 * Control on the number using mod-11 arithmetic and the
	 * specified multiplier
	 *
	 * @param	number number to be controlled
	 *	@param	multiplier weight multiplier
	 * @return	true if valid control, false otherwise
	 */
   private static boolean isMod11(String number, int[] multiplier) {
      if (null == number || null == multiplier || multiplier.length != DIGIT_COUNT) {
         return false;
      }

      // Append leading zeros to the number
      while (number.length() < DIGIT_COUNT) {
         number = "0" + number;
      }

      int sum = 0;
      for (int i = 0; i <= DIGIT_COUNT - 1; ++i) {
         char ch = number.charAt(i);
         if (ch < '0' || '9' < ch) {
            return false;
         }

         sum += val(ch) * multiplier[i];
      }

      return (0 == (sum %= 11));
   }

   // not JavaDoc'et since not Webwork functionality
   /*
	 * Controls whether a norwegian social security number is CDV valid
	 * @param	ssn Social security number
	 * @return	true if valid, false otherwise
	 */
   private static boolean isSSNMod11(String ssn) {
      return
              isMod11(ssn, SSN_MULTIPLIER) &&
              isMod11(ssn, CONTROL_NO_MULTIPLIER);
   }


   // not JavaDoc'et since not Webwork functionality
   /*
	 * Get the numveric value of a character.
	 * @param ch character between 0 and 9
	 * @return numeric value of character
	 */
   private final static int val(char ch) {
      if ('0' <= ch && ch <= '9') {
         //throw new Exception("Charachter must be numeric.");
      }
      return ch - '0';
   }


}