public Order(Customer cust)
{
this.cust = cust;
OrderNum = nextOrderNum;
//orderNum = nextOrderNum++;
}
public static void AddCustomer(ArrayList customers, ref Customer newCust)
{
//method that adds a new customer to the array list unless there is a duplicate name
//if there is a duplicate name, then it deletes the new customer and throws an exception.
foreach (Customer cust in customers)
if (cust.Fname == newCust.Fname && cust.Lname == newCust.Lname) {//already using compareTo for sorting
newCust = null;
throw new ArgumentException("Customer " + cust.ID + " " + cust.Fname + " " + cust.Lname + " already exists. ");
}
customers.Add(newCust);
}
public void readFromFile(String fname, ArrayList customerList)
{
if (fname2 != fname) {//restart the process if the file changes
firstRun = true;
fname2 = fname;
}
try {
if (firstRun) {
infile = new FileStream(fname, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
//reader = new StreamReader(infile);
firstRun = false;
}
String str = infile.readLine();
String[] tokens = str.Split(new char[] { ',' });
if (String.Equals(tokens[0], "Order", StringComparison.OrdinalIgnoreCase)) {
//then we are reading an order
//Order,orderNum,customerNum,numCones
this.OrderNum = Convert.ToInt32(tokens[1]);
int customerNum = Convert.ToInt32(tokens[2]);//read customer number
foreach(Customer cust in customerList)//match customer number to customer
if (cust.ID == customerNum) {
this.cust = cust;
break;
}
if(this.cust == null)
throw new IOException("Customer in input file not found. ");
int numCones = Convert.ToInt32(tokens[3]);
if (numCones > 10)
throw new IOException("An order contains more than 10 cones. ");
for (int i = 0; i < numCones; i++) {
try {
//try to read an ice cream cone
IceCream cream = new IceCream();
cream.readFromFile(infile);
this.addCone(cream);
}
catch (ConeTypeMismatchException) {
//else read a yogurt cone
Yogurt yogurt = new Yogurt();
yogurt.readFromFile(infile);
this.addCone(yogurt);
}
}//end loop
}
else
throw new IOException("Order object not encountered in file. ");//non-cone data
}
catch (System.IO.FileNotFoundException) { throw; }//file not found
catch (System.NullReferenceException) {
//something is wrong with the input file, or most likely end of file
infile.Close();//close the file
infile = null;//deallocate memory
firstRun = true;
throw;//inform calling method there are no more records
}
catch (FormatException) { throw; }//input is not in the right format
}
public Order()
{
this.cust = null;
orderNum = 0;
}