parkinglot

public interface Permission{
float getFee(Calendar start, Calendar end);
}
class ParkingLot{
private Listgt; freeMotorSpace;
private Listgt; freeHandicappedSpace;
private Listgt; freeCompactSpace;
public ParkingLot();
public ParkingSpace allocateFreeSpace(ParkingSpaceType pspaceType)
{
//get a ParkingSpace from the corresponding free list
pspace.setStart();
return pspace;
}
public float reclaimFreeSpace(ParkingSpace pspace){
pspace.setEnd();
//return free space to the list
return pspace.getFee(perm);
}
private Permission perm;
}
class ParkingSpace
{
enum ParkingSpaceType
{
MOTORBIKE, CAR, HANDICAPPED;
}
private int id;
private ParkingSpaceType pspaceType;
private ParkingMeter meter;
public ParkingSpace(int id, ParkingSpaceType pspaceType)
{
super();
this.id = id;
this.pspaceType = pspaceType;
}
public int getId()
{
return id;
}
public ParkingSpaceType getpspaceType()
{
return pspaceType;
}
private class ParkingMeter{
public GregorianCalendar start;
public GregorianCalendar end;
}
public void setStart()
{
meter.start = new GregorianCalendar();
}
public void setEnd()
{
meter.end = new GregorianCalendar();
}
public float getFee(Permision perm)
{
return perm.getFee(meter.start, meter.end);
}
}
public abstract class Vehicle{
public boolean park(ParkingLot pLot);
public boolean unpark(ParkingLot pLot){
if(pspace != null){
pLot.reclaimFreeSpace(pspace);
return true;
}
return false;
};
private ParkingSpace pspace;
}
public class Motorbike extends Vehicle{
public boolean park(ParkingLot pLot){
if((pspace=pLot.allocateFreeSpace(ParkingSpaceType.MOTORBIKE))==null){
return false;
}
return true;
}
}
public class Cars extends Vehicle{
public boolean park(ParkingLot pLot){
if((pspace=pLot.allocateFreeSpace(ParkingSpaceType.CAR))==null){
return false;
}
return true;
}
}
public class HandicappedCars extends Vehicle{
public boolean park(ParkingLot pLot){
if((pspace=pLot.allocateFreeSpace(ParkingSpaceType.HANDICAPPED))==null && (pspace=pLot.getfreeSpace(ParkingSpaceType.CAR))==null){
return false;
}
return true;
}
}