Question

Complete the implementations of various classes in a Flight Management, We consider a database that stores information about passengers and flights. Each passenger
record (e.g., String name, double TicketAmount, int flightID) can be uniquely identified by a String ID (e.g., ”e1”), whereas each flight record (e.g., String airline and String flight
for flight name and airline name, respectively ) can be uniquely identified by an integer id. You must implement all methods in the FlightManagementSystem by manipulating the
two attributes passengers and flights, each of which declared as a HashMap.
class FlightManagementSystem f
HashMap<Integer, FlightInfo> flights;
HashMap<String, PassengerInfo > passengers;
/* All methods must be implemented via ’flights’ and ’passengers’
*/

Override the compareTo and equal methods in the PassengerInfo class. Override the
equals method in the FlightInfo class. For simplicity, you can assume that a passenger
cannot be added in multiple flights

package fms;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;

public class FlightManagementSystem {
  
   /*
   * Each entry in a 'passengers' map contains
   * a unique ID (this is different from the flightID defined in the passenger class), and its associated information object.
   */
   HashMap<String, PassengerInfo> passengers;

   /*
   * Each entry in a 'flights' map contains
   * a unique id (this is different from the flightID defined in the passenger class) and its associated information object.
   */
   HashMap<Integer, FlightInfo> flights;

   /**
   * Initialize an empty database.
   */
   public FlightManagementSystem() {
      
   }

   /**
   * Add a new passenger entry.
   * @param id - id of the passenger
   * @param info - information object of the passenger
   * @throws IdAlreadyExistsExceptoin if 'id' is an existing passenger id
   */
   public void addPassenger(String id, PassengerInfo info) throws IdAlreadyExistsExceptoin {
      
       }
   }

   /**
   * Remove an existing passenger entry.
   * @param id - id of the passenger
   * @throws IdNotFoundException if 'id' is not an existing passenger id
   */
   public void removePassenger(String id) throws IdNotFoundException {
      
   }
  
  
  

   /**
   * Add a new flight entry.
   * @param id id of the flight
   * @param info information object of the flight
   * @throws IdAlreadyExistsExceptoin if 'id' is an existing flight id
   */
   public void addFlight(Integer id, FlightInfo info) throws IdAlreadyExistsExceptoin {
      
   }

   /**
   * Remove an existing flight entry.
   * @param id id of some flight
   * @throws IdNotFoundException if 'id' is not an existing flight
   */
   public void removeFlight(Integer id) throws IdNotFoundException {
      
   }

  
  
   /**
   * Change the flight of passenger with id 'eid' to a new flight with id 'did'.
   *
   * You can assume that 'did' denotes a flight different from
   * the current flight of the passenger denoted by 'eid'.
   * @param eid id of some passenger
   * @param did id of some flight
   * @throws IdNotFoundException if either eid is a non-existing passenger id or did is a non-existing flight id.
   */
   public void changeFlight(String eid, Integer did) throws IdNotFoundException {
      
   }

   /**
   * Retrieve the name of passenger with id 'id'.
   * @param id id of some passenger
   * @return name of the passenger with id 'id'
   * @throws IdNotFoundException if 'id' is not an existing passenger id
   */
   public String getPassengerName(String id) throws IdNotFoundException {
      
   }

   /**
   * Retrieve the names of all passengers of the flight with id 'id'.
   * If 'id' a non-existing flight id, then return an empty list.
   * @param id id of some flight
   * @return List of names of passengers whose flight has id 'id'
   */
   public ArrayList<String> getPassengerNames(Integer id) {
      
   }

   /**
   * Retrieve passengers flight information object.
   * @param id id of some passenger
   * @return The information object of the passengers flight
   * @throws IdNotFoundException if 'id' is not an existing passenger id
   */
   public FlightInfo getFlightInfo(String id) throws IdNotFoundException {
  
   }

   /**
   * Retrieve a list, sorted in increasing order,
   * the information objects of all stored passengers.
   *
   * Hints:
   * 1. Override the 'compareTo' method in PassengerInfo class.
   * 2. Look up the Arrays.sort method in Java API.
   * @return A sorted list of information objects of all passengers.
   */
   public PassengerInfo[] getSortedPassengerInfo() {
      
   }

   /**
   * Retrieve the average ticket paid by all passengers in flight with id 'id'.
   * @param id id of some flight
   * @return average ticket paid by all passengers in a flight with id 'id'
   * @throws IdNotFoundException if id is not an existing flight id
   */
   public double getAverageTicketAmount(Integer id) throws IdNotFoundException {
      
   }

  
  
}

FlightInfo public FlightInfo (java.lang.String name, java.lang.String airline) Parameters: name - - flight name (e.g., SourceDestination, LondonToronto) to set airline - - airline (e.g., AirCanada) name to set Method Detail getName public java.lang.String getName() Returns: name - flight name to get setName public void setName (java.lang.String name) Parameters: name - - flight name to set

• Returns:

  average ticket paid by all passengers in a flight with id 'id'

  Throws:

  IdNotFoundException - if id is not an existing flight id

• 

• 

• 

Answer 1

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;

class PassengerInfo implements Comparable<PassengerInfo> {
    private String name;
    private double ticketAmount;
    private int id;

    public PassengerInfo(String name, double ticketAmount, int id) {
        this.name = name;
        this.ticketAmount = ticketAmount;
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getTicketAmount() {
        return ticketAmount;
    }

    public void setTicketAmount(double ticketAmount) {
        this.ticketAmount = ticketAmount;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Override
    public int compareTo(PassengerInfo o) {
        if(ticketAmount < o.ticketAmount) {
            return -1;            
        } else if(ticketAmount > o.ticketAmount) {
            return 1;            
        } else {
            return o.id - id;
        }
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        PassengerInfo other = (PassengerInfo) obj;
        if (id != other.id)
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        if (Double.doubleToLongBits(ticketAmount) != Double.doubleToLongBits(other.ticketAmount))
            return false;
        return true;
    }

}

class FlightInfo {
    private String name, airline;

    public FlightInfo(String name, String airline) {
        this.name = name;
        this.airline = airline;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAirline() {
        return airline;
    }

    public void setAirline(String airline) {
        this.airline = airline;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        FlightInfo other = (FlightInfo) obj;
        if (airline == null) {
            if (other.airline != null)
                return false;
        } else if (!airline.equals(other.airline))
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }
}

class IdAlreadyExistsExceptoin extends Exception {
    
}

class IdNotFoundException extends Exception {
    
}

public class FlightManagementSystem {

    /*
     * Each entry in a 'passengers' map contains a unique ID (this is different from
     * the flightID defined in the passenger class), and its associated information
     * object.
     */
    HashMap<String, PassengerInfo> passengers;

    /*
     * Each entry in a 'flights' map contains a unique id (this is different from
     * the flightID defined in the passenger class) and its associated information
     * object.
     */
    HashMap<Integer, FlightInfo> flights;

    /**
     * Initialize an empty database.
     */
    public FlightManagementSystem() {
        passengers = new HashMap<>();
        flights = new HashMap<>();
    }

    /**
     * Add a new passenger entry.
     *
     * @param id   - id of the passenger
     * @param info - information object of the passenger
     * @throws IdAlreadyExistsExceptoin if 'id' is an existing passenger id
     */
    public void addPassenger(String id, PassengerInfo info) throws IdAlreadyExistsExceptoin {
        if(passengers.containsKey(id)) {
            throw new IdAlreadyExistsExceptoin();
        }
        passengers.put(id, info);
    }

    /**
     * Remove an existing passenger entry.
     *
     * @param id - id of the passenger
     * @throws IdNotFoundException if 'id' is not an existing passenger id
     */
    public void removePassenger(String id) throws IdNotFoundException {
        if(!passengers.containsKey(id)) {
            throw new IdNotFoundException();
        }
        passengers.remove(id);
    }

    /**
     * Add a new flight entry.
     *
     * @param id   id of the flight
     * @param info information object of the flight
     * @throws IdAlreadyExistsExceptoin if 'id' is an existing flight id
     */
    public void addFlight(Integer id, FlightInfo info) throws IdAlreadyExistsExceptoin {
        if(flights.containsKey(id)) {
            throw new IdAlreadyExistsExceptoin();
        }
        flights.put(id, info);
    }

    /**
     * Remove an existing flight entry.
     *
     * @param id id of some flight
     * @throws IdNotFoundException if 'id' is not an existing flight
     */
    public void removeFlight(Integer id) throws IdNotFoundException {
        if(!flights.containsKey(id)) {
            throw new IdNotFoundException();
        }
        flights.remove(id);
    }

    /**
     * Change the flight of passenger with id 'eid' to a new flight with id 'did'.
     *
     * You can assume that 'did' denotes a flight different from the current flight
     * of the passenger denoted by 'eid'.
     *
     * @param eid id of some passenger
     * @param did id of some flight
     * @throws IdNotFoundException if either eid is a non-existing passenger id or
     *                             did is a non-existing flight id.
     */
    public void changeFlight(String eid, Integer did) throws IdNotFoundException {
        if(!passengers.containsKey(eid)) {
            throw new IdNotFoundException();
        }
        passengers.get(eid).setId(did);
    }

    /**
     * Retrieve the name of passenger with id 'id'.
     *
     * @param id id of some passenger
     * @return name of the passenger with id 'id'
     * @throws IdNotFoundException if 'id' is not an existing passenger id
     */
    public String getPassengerName(String id) throws IdNotFoundException {
        if(!passengers.containsKey(id)) {
            throw new IdNotFoundException();
        }
        return passengers.get(id).getName();
    }

    /**
     * Retrieve the names of all passengers of the flight with id 'id'. If 'id' a
     * non-existing flight id, then return an empty list.
     *
     * @param id id of some flight
     * @return List of names of passengers whose flight has id 'id'
     */
    public ArrayList<String> getPassengerNames(Integer id) {
        ArrayList<String> result = new ArrayList<>();
        for(PassengerInfo p: passengers.values()) {
            if(p.getId() == id) {
                result.add(p.getName());
            }
        }
        return result;
    }

    /**
     * Retrieve passengers flight information object.
     *
     * @param id id of some passenger
     * @return The information object of the passengers flight
     * @throws IdNotFoundException if 'id' is not an existing passenger id
     */
    public FlightInfo getFlightInfo(String id) throws IdNotFoundException {
        if(!passengers.containsKey(id)) {
            throw new IdNotFoundException();
        }
        return flights.get(passengers.get(id).getId());
    }

    /**
     * Retrieve a list, sorted in increasing order, the information objects of all
     * stored passengers.
     *
     * Hints: 1. Override the 'compareTo' method in PassengerInfo class. 2. Look up
     * the Arrays.sort method in Java API.
     *
     * @return A sorted list of information objects of all passengers.
     */
    public PassengerInfo[] getSortedPassengerInfo() {
        ArrayList<PassengerInfo> p = new ArrayList<>();
        p.addAll(passengers.values());
        Collections.sort(p);
        
        PassengerInfo result[] = new PassengerInfo[p.size()];
        return p.toArray(result);
    }

    /**
     * Retrieve the average ticket paid by all passengers in flight with id 'id'.
     *
     * @param id id of some flight
     * @return average ticket paid by all passengers in a flight with id 'id'
     * @throws IdNotFoundException if id is not an existing flight id
     */
    public double getAverageTicketAmount(Integer id) throws IdNotFoundException {
        double total = 0;
        for(PassengerInfo p: passengers.values()) {
            total += p.getTicketAmount();
        }
        return total/passengers.size();
    }

}

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