public float getCost(Floor floor, Direction destinationDirection) {
// TODO: In morning simulation, cars get stuck on the top floor
Assignment a = new Assignment(floor, destinationDirection);
if (assignments.getCurrentAssignment() == null) {
// don't care about direction
float time = car.getTravelTime(floor);
return time;
}
// Don't send another elevator to do the work if this elevator is already
// doing it.
if (assignments.contains(a)) return 0.0F;
// factors:
// 1. how much will it slow down the elevator in processing existing
// tasks?
// 2. how long will it take for elevator to arrive *******
// 3. how does this affect the distribution of elevators in the system?
// (probably would eventually be in Building)
float cost = 0.0F;
// For now, only #2 above is implemented.
float currentHeight = car.getHeight();
for (Iterator allDestinations =
assignments.iteratorIncluding(
car.getFloorRequestPanel().getServicedFloors(), getNearestBase(), a);
allDestinations.hasNext(); ) {
Assignment nextAssignment = (Assignment) allDestinations.next();
Floor nextDestination = nextAssignment.getDestination();
float nextHeight = nextDestination.getHeight();
// stop condition when destination would be reached.
// LATER: continue to evaluate total trip cost vs. partial trip cost
// if (a.equals(nextAssignment))
// {
// cost += car.getTravelTime(nextDestination.getHeight() - currentHeight);
// return cost;
// }
// accumulator for number of stops
cost += floor.getCarEntranceForCar(car).getDoor().getMinimumCycleTime();
// accumulator for total distance
cost += car.getTravelTime(nextHeight - currentHeight);
currentHeight = nextHeight;
if (nextAssignment.equals(a)) break;
}
// all destinations have been accumulated, and we did not add this stop.
// So now the stop must be added specifically from the last stop.
cost += car.getTravelTime(floor.getHeight() - currentHeight);
return cost;
}
public void setNextDestination() {
Floor location = car.getLocation();
Assignment newAssignment = assignments.getCurrentAssignment();
if (location != null && !location.getCallPanel().isDown() && !location.getCallPanel().isUp()) {
while (newAssignment != null && newAssignment.getDestination() == location) {
assignments.removeAssignment(newAssignment);
newAssignment = assignments.getCurrentAssignment();
}
}
if (newAssignment != null) car.setDestination(newAssignment.getDestination());
}
/** The nearest base is the nearest floor we could reasonably stop at. */
public Assignment getNearestBase() {
Assignment current = assignments.getCurrentAssignment();
Direction currAssignmentDirection = (current == null) ? Direction.NONE : current.getDirection();
// The first case is the car is docked
Floor carLocation = car.getLocation();
if (carLocation != null) {
final CarEntrance entrance = carLocation.getCarEntranceForCar(car);
Direction dockedDirection =
entrance.isUp()
? Direction.UP
: entrance.isDown() ? Direction.DOWN : currAssignmentDirection;
return new Assignment(carLocation, dockedDirection);
}
// The second case is the car is idle
Floor f = car.getFloorAt();
if (f != null) return new Assignment(f, currAssignmentDirection);
// Finally, the third case is the car is travelling
float currentHeight = car.getHeight();
Direction carDirection =
(current.getDestination().getHeight() < currentHeight) ? Direction.DOWN : Direction.UP;
List floors = car.getFloorRequestPanel().getServicedFloors();
for (Iterator i = createFloorContexts(floors, carDirection); i.hasNext(); ) {
FloorContext context = (FloorContext) i.next();
if (context.contains(currentHeight)) {
float distance = Math.abs(context.getNext().getHeight() - currentHeight);
boolean canCarStop = distance >= stoppingDistance;
if (canCarStop || context.getNext() == getDestination())
return new Assignment(context.getNext(), carDirection);
return new Assignment(context.getSuccessor(), carDirection);
}
}
throw new IllegalStateException("The car is somehow not between two floors.");
}