/// <summary>
/// Determines whether the specified account number is valid. The account number
/// is given as a full number including the hypothetical check digit.
/// validation steps:
/// * bank code can have 3 digits max
/// * account number can have 9 digits max (including the 2 check digits)
/// * check digits are valid
/// </summary>
/// <param name="accountNumber">The account number including the hypothetical check digit.</param>
/// <param name="validationErrors">Collection is filled up with the validation error messages</param>
/// <returns>
/// <c>true</c> if the specified account number is valid; otherwise, <c>false</c>.
/// </returns>
public bool Validate(NationalAccountNumber accountNumber, ICollection <ValidationError> validationErrors)
{
if (accountNumber == null)
{
throw new ArgumentNullException("accountNumber", "Please provide an account number.");
}
validationErrors = validationErrors ?? new List <ValidationError>();
var belgiumAccountNumber = new BelgiumAccountNumber(accountNumber);
ValidationMethodsTools.ValidateMember(belgiumAccountNumber.AccountNumber, 9, validationErrors, ValidationErrorCodes.AccountNumberMissing, ValidationErrorCodes.AccountNumberTooLong);
ValidationMethodsTools.ValidateMember(belgiumAccountNumber.BankCode, 3, validationErrors, ValidationErrorCodes.BankCodeMissing, ValidationErrorCodes.BankCodeTooLong);
if (validationErrors.Count > 0)
{
return(false);
}
var accountNumberWithBankCode =
String.Format("{0,3}{1,9}", belgiumAccountNumber.BankCode, belgiumAccountNumber.AccountNumber).Replace(' ', '0');
if (!validationMethod.IsValid(accountNumberWithBankCode))
{
validationErrors.AddValidationErrorMessage("The validation of the check digits failed.");
}
return(validationErrors.Count == 0);
}
/// <summary>
/// Calculates the check digit.
/// The account number is given without a check digit.
/// </summary>
/// <param name="accountNumber">The account number without a check digit.</param>
/// <returns>
/// The calculated check digit for the given account number
/// </returns>
public string CalculateCheckDigit(NationalAccountNumber accountNumber)
{
if (accountNumber == null)
{
throw new ArgumentNullException("accountNumber", "Please provide an account number.");
}
var belgiumAccountNumber = new BelgiumAccountNumber(accountNumber);
if (String.IsNullOrEmpty(belgiumAccountNumber.AccountNumber))
{
throw new ArgumentException("The account number is missing.", "accountNumber");
}
if (String.IsNullOrEmpty(belgiumAccountNumber.BankCode))
{
throw new ArgumentException("The bank code is missing.", "accountNumber");
}
var accountNumberWithBankCode =
String.Format("{0,3}{1,7}", belgiumAccountNumber.BankCode, belgiumAccountNumber.AccountNumber).Replace(' ', '0');
var digits = validationMethod.CalculateCheckDigit(accountNumberWithBankCode);
return(digits.Length < 2 ? "0" + digits : digits);
}