/**
* Assign passenger p who has a booking but no seat to the specified seat.
*
* @param p the passenger to be given a seat
* @param seat the seat for the passenger
* @precond p != null && isSeatAvailable(seat) && p.hasBookingOn(this) && !p.hasSeatOn(this)
*/
public void assignSeat(Passenger p, String seat) {
if (p == null) throw new RuntimeException("Cannot assign a seat for a null passenger.");
if (!isSeatAvailable(seat))
throw new RuntimeException(
"Seat " + seat + " is invalid or already occupied " + "so cannot book it.");
if (p.hasSeatOn(this))
throw new RuntimeException(
p.getName()
+ " already has a seat on flight "
+ getNumber()
+ " so cannot book another one.");
Iterator<Booking> waitingIter = waitingSeatList.iterator();
while (waitingIter.hasNext()) {
Booking curBooking = waitingIter.next();
if (curBooking.getPerson() == p) {
waitingIter.remove();
curBooking.setSeat(seat);
setSeat(curBooking);
return;
}
}
throw new RuntimeException("Cannot assign a seat if not already booked and waiting.");
}
/**
* This method reports that a passenger is taking stairs (no elevator is available on the
* appropriate floor).
*
* @param newPass Passenger object for this passenger
*/
private static void takingStairs(Passenger newPass) {
System.out.print(
"Passenger " + newPass.getName() + " arrives on floor " + newPass.getFloor() + ".");
System.out.println(" Taking stairs.");
} // end takingStairs
/**
* Read and process each item in the simulation file. It reads each input item in the file. If a
* PASSENGER entry, a passenger object is created, and the elevators are checked to see if one is
* available to service this passenger. If so, the passenger is logically added to the elevator.
* If an elevator is not available, the passenger must take the stairs.
*
* <p>If the input item is a TICK, it indicates that one time unit has passed. At EOF, the method
* is invoked to shut the elevators down and perform the end of day processing.
*
* <p>If an error is detected at any time, this method returns the proper boolean to the calling
* method.
*
* @return True or False to indicate an error
*/
private static boolean processSimulationFile() {
// local constants used by this method
final String PASSENGER = "passenger";
final String TICK = "tick";
final String SIMULATION_END = "done";
boolean done = false; // set when done
boolean error = false; // set if error detected
boolean addedOK = false; // set if no elevator is available
Passenger newPass = null; // new passenger object
Elevator availableEl = null; // elevator object
// Read next token from file and process
try {
while (!done && !error && in.nextToken() != in.TT_EOF) {
if (in.sval.equals(PASSENGER)) {
// if a new passenger, create a new object, look
// for an elevator and add to elevator. If elevator
// is not available, passenger takes the stairs.
newPass = newPassenger();
availableEl = findElevator(newPass);
if (availableEl == null) takingStairs(newPass);
else {
System.out.print(
"Passenger: "
+ newPass.getName()
+ " arrives on floor "
+ newPass.getFloor()
+ ".");
addedOK = availableEl.addPassenger(newPass);
if (!addedOK) {
error = true;
}
}
} else if (in.sval.equals(TICK)) {
// token read from file is a time indicator
recordTick();
} else if (in.sval.equals(SIMULATION_END)) {
// end of file == end of workday
done = true;
} else {
error = true;
}
} // end while
if (in.nextToken() == in.TT_EOF) {
// perform end of day reporting
endOfDay();
}
// catch for file exception
} catch (IOException e) {
error = true;
} // end try
return error;
} // end processSimulationFile
