/**
* Tells when the item at the front of the ConveyorBelt queue will depart that queue and
* subsequently enter a ShipmentProcessStation queue. If the queue is empty, return
* Integer.MAX_VALUE.
*
* @return int departTime time when the item at the front of the conveyor belt will depart.
*/
public int departTimeNext() {
int departTime = Integer.MAX_VALUE;
if (!queueFromFactory.isEmpty()) {
ItemToShip item = queueFromFactory.front();
departTime = item.getArrivalTime();
}
return departTime;
}
/**
* Returns the next ItemToShip that needs to be processed. Removes the item from the ShipmentQueue
* and adds it to the ShipmentProcessStation.
*
* @return ItemToShip item to be processed next.
*/
public ItemToShip processNext() {
if (queueFromFactory == null) {
throw new NoSuchElementException();
}
ItemToShip item = queueFromFactory.remove();
item.getInLine(station);
return item;
}
/**
* Constructor for ConveyorBelt. It initializes the station array and adds ItemToShip shipments to
* the queue using BookShipmentFactory.generateBookShipments().
*
* @param numberOfItems int amount of shipments to be created.
* @param station ShipmentProcessStation array of stations.
*/
public ConveyorBelt(int numberOfItems, ShipmentProcessStation[] station) {
this.station = station; // assigns the station
// creating the queue and adding itemToShip to queue (with arrival time)
queueFromFactory = new ShipmentQueue();
for (int i = 0; i < numberOfItems; i++) {
queueFromFactory.add(BookShipmentFactory.generateBookShipment());
}
}
/**
* Returns true if ShipmentQueue is not empty
*
* @return boolean true of ShipmentQueue is not empty
*/
public boolean hasNext() {
return (!queueFromFactory.isEmpty());
}
/**
* Returns the size of the ShipmentQueue
*
* @return int size of shipment queue
*/
public int size() {
return queueFromFactory.size();
}
