/// <summary>
/// Calculates the check digit for the given credit card number.
/// </summary>
/// <param name="creditCardNumber">The credit card number.</param>
/// <param name="creditCardNetwork">The credit card network.</param>
/// <exception cref="ArgumentNullException">is thrown, if an argument isn't provided</exception>
/// <exception cref="ArgumentException">is thrown, if the credit card network can't be automatically detected</exception>
/// <exception cref="InvalidOperationException">is thrown, if there is a problem with the mapping of the network to a check method</exception>
/// <returns></returns>
public string CalculateCheckDigit(string creditCardNumber, string creditCardNetwork)
{
if (creditCardNetwork == null)
{
throw new ArgumentNullException("creditCardNetwork", "Please provide a credit card network code for a check method.");
}
if (string.IsNullOrEmpty(creditCardNumber))
{
throw new ArgumentNullException("creditCardNumber", "Please provide a credit card number.");
}
if (CreditCardNetworkMapToMethod == null)
{
throw new InvalidOperationException("Please provide an instanz for the mapping between a check method code and a check method.");
}
creditCardNumber = CleanUp(creditCardNumber);
if (creditCardNetwork == CreditCardNetwork.Automatic)
{
creditCardNetwork = CreditCardNumberMapToNetwork.Resolve(creditCardNumber);
if (string.IsNullOrEmpty(creditCardNetwork))
{
throw new ArgumentException("Please provide a specific credit card network identifier because it can not be resolved from the given credit card number.", "creditCardNetwork");
}
}
var checkMethod = CreditCardNetworkMapToMethod.Resolve(creditCardNetwork);
if (checkMethod == null)
{
throw new InvalidOperationException(String.Format("The credit card network code {0} could not be mapped to a check method implementation.", creditCardNetwork));
}
return(checkMethod.CalculateCheckDigit(creditCardNumber));
}
/// <summary>
/// Initializes a new instance of the <see cref="CreditCardNumberCheck"/> class.
/// </summary>
/// <param name="creditCardNetworkMapToMethod">The credit card network code map to method.</param>
public CreditCardNumberCheck(ICreditCardNetworkMapToMethod creditCardNetworkMapToMethod)
{
CreditCardNetworkMapToMethod = creditCardNetworkMapToMethod;
CreditCardNumberMapToNetwork = new CreditCardNumberMapToNetwork();
}
/// <summary>
/// Initializes a new instance of the <see cref="CreditCardNumberCheck"/> class.
/// </summary>
public CreditCardNumberCheck()
{
CreditCardNetworkMapToMethod = new CreditCardNetworkMapToMethodFactory();
CreditCardNumberMapToNetwork = new CreditCardNumberMapToNetwork();
}