ccservicesimpl.java

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/*
* @author                        : Neelesh
* @Version                       : 2.0
*
* Development Environment        : Oracle9i JDeveloper 
* Name of the File               : CCServicesImpl.java
* Creation/Modification History  :
*
* Neelesh    04-Apr-2003      Created
*
*/
package oracle.otnsamples.ws;

/**
 * Class providing credit card validation methods. This implementation
 * uses LUHN algorith to validate 16 digit number cards.
 * 
 * @author Neelesh
 * @version 2.0
 */
public class CCServicesImpl implements CCServices {
  
  /**
   * This method validates the credit card number. The underlying validation 
   * mechanism depends on the implementation provided.
   * @param <b>cardNumber</b> The credit card number
   * @throws <b>CCException</b> Exception thrown if the card number is invalid.
   */
  public void validateCard( String cardNumber )
              throws CCException {
    if( cardNumber == null ) {
      throw new CCException( "Credit Card Number is null, invalid entry." );
    }
    int len = cardNumber.trim().length();
    if( len != 16 ) {
      throw new CCException( "Credit Card Number should have 16 digits" );
    }
    
    // Convert to char array of digits
    char[] digits = cardNumber.toCharArray();
    boolean odd = false;
    int sum = 0;
    int digit = 0;
    
    // Odd number of digits in credit card
    if( digits.length % 2 != 0 ) {
      odd = true;
    }
    
    // LUHN Algorithm is used to validate the card .
    for( int i = digits.length - 1;i >= 0;i-- ) {
      digit = digits[i] - 48;
      if (digit<0 || digit>9) {
        throw new CCException("Credit card number has invalid characters");
      }
      if( ( !odd && ( i % 2 == 0 ) ) || ( odd && ( i % 2 != 0 ) ) ) {
        digit *= 2;
      }
      if( digit > 9 ) {
        sum += 1 + ( digit % 10 );
      }
      else {
        sum += digit;
      }
    }
  // NOTE : THIS IS COMMENTED BECAUSE WE DONT WANT USERS TO ENTER ACTUAL 
  // CARD NUMBERS
  //if(sum % 10 !=0) throw new CCException("Invalid CreditCard");
  }
}