/**
* 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;
}
/**
* 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;
}
/**
* Updates the three data members from the parameter. Checks that the ItemToShip is not null.
*
* @param item ItemToShip package
*/
public void logItem(ItemToShip item) {
// Make sure that ItemToShip is not null
if (item != null) {
// ItemToShip is used to record the item's statistics
numCompleted++;
totalWaitTime += item.getWaitTime();
totalProcessTime += item.getProcessTime();
}
}