package Question10_2;

import java.util.HashMap;

public class Server {

HashMap<Integer, Machine> machines = new HashMap<Integer, Machine>();

HashMap<Integer, Integer> personToMachineMap = new HashMap<Integer, Integer>();

public Machine getMachineWithId(int machineID) {

return machines.get(machineID);

}

public int getMachineIDForUser(int personID) {

Integer machineID = personToMachineMap.get(personID);

return machineID == null ? -1 : machineID;

}

public Person getPersonWithID(int personID) {

Integer machineID = personToMachineMap.get(personID);

if (machineID == null) {

return null;

}

Machine machine = getMachineWithId(machineID);

if (machine == null) {

return null;

}

return machine.getPersonWithID(personID);

}

}