public ATM()
{
//creating handlers, setting initial state of ATM
bills50s = new CurrencyBill(50, 1);
bills100s = new CurrencyBill(100, 2);
bills200s = new CurrencyBill(200, 3);
bills500s = new CurrencyBill(500, 2);
bills1000s = new CurrencyBill(1000, 4);
bills2000s = new CurrencyBill(2000, 1);
bills5000s = new CurrencyBill(5000, 1);
bills50s
.RegisterNext(bills100s)
.RegisterNext(bills200s)
.RegisterNext(bills500s)
.RegisterNext(bills1000s)
.RegisterNext(bills2000s)
.RegisterNext(bills5000s);
mode = "authorization";
maxNotesAmount = 15;
currNotesAmount = 0;
}
public void doWithdraw(int amount, CurrencyBill firstHandler, ref int sum_dispense)
{
while (true)
{
//sender pass the request to first handler in the pipeline
var isDepensible = firstHandler.DispenseRequest(amount, this, ref sum_dispense);
if (!isDepensible)
{
MessageBox.Show($"Failed to dispense ${amount}!");
}
}
}
public int ExecuteWithdraw(bool isSmallMode, bool isLargeMode, int amount)
{
var currCashState = getCurrCashInATM();
Dictionary <int, int> source = new Dictionary <int, int>(currCashState);
CurrencyBill firstHandler = null;
if (isSmallMode)
{
//set proper handlers pipeline
bills50s
.RegisterNext(bills100s)
.RegisterNext(bills200s)
.RegisterNext(bills500s)
.RegisterNext(bills1000s)
.RegisterNext(bills2000s)
.RegisterNext(bills5000s);
firstHandler = bills50s;
}
else if (isLargeMode)
{
//set proper handlers pipeline
bills5000s
.RegisterNext(bills2000s)
.RegisterNext(bills1000s)
.RegisterNext(bills500s)
.RegisterNext(bills200s)
.RegisterNext(bills100s)
.RegisterNext(bills50s);
firstHandler = bills5000s;
}
int sum_dispense = 0;
doWithdraw(amount, firstHandler, ref sum_dispense);
return(sum_dispense);
}
//Method that set next handler in the pipeline
public CurrencyBill RegisterNext(CurrencyBill currencyBill)
{
next = currencyBill;
return(next);
}
//A static constructor that initializes static Zero property
//This property is used as default next handler instead of a null object
static CurrencyBill()
{
Zero = new ZeroCurrencyBill();
}