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home / study / engineering / computer science / computer science questions and answers / you have been asked to write a simulation program for an airport. the simulation will specify ... Question: You have been asked to write a simulation program for an airport. The simulation will specify the... You have been asked to write a simulation program for an airport. The simulation will specify the number of runways and generate a file representing scheduled flight arrivals and departures. A runway can only be assigned to one flight at a time. All arrivals and departures will reserve the runway for a specified amount of time respectively. Since it is more expensive and dangerous to keep a plane waiting to land, arrivals have priority over departures. This means that a runway will be assigned to a plane ready to land before being assigned to any plane waiting to take off. Airport Class: package edu.metrostate.ics240.p4.sim; import java.io.FileNotFoundException; import java.io.PrintWriter; import java.time.LocalTime; import java.util.Random; import edu.metrostate.ics240.p4.sim.Event.EventType; public abstract class Airport { private static final double DEPARTURE_PROB = 0.20; private static final double ARRIVAL_PROB = 0.15; private static final int SIM_MINUTES = 60; private static final long SEED = 20170216001L; private static final Random RAND = new Random(SEED); protected static final String DELIM = "\|"; /** * Generates a file of flight events based on default settings * @param fileName name of output file */ public static void genEventFile(String fileName) { genEventFile(fileName, ARRIVAL_PROB, DEPARTURE_PROB, SIM_MINUTES); } /** * Generates a file of flight events based on provided parameters * @param fileName name of output file * @param arrivalProbability statistical probability of an arrival at a given time * @param departureProbability statistical probability of a departure at a given time * @param minutes number of minutes of simulator data to generate */ public static void genEventFile(String fileName, double arrivalProbability, double departureProbability, int minutes) { int flightId = 1; try (PrintWriter simFile = new PrintWriter(fileName);) { LocalTime time = LocalTime.parse("00:00"); for (int i = 0; i < minutes; i++) { if (RAND.nextDouble() <= arrivalProbability) { simFile.printf("%s|%s|%s ", time.plusMinutes(i), Event.EventType.ARRIVAL, String.format("A%03d", flightId++)); } if (RAND.nextDouble() <= departureProbability) { simFile.printf("%s|%s|%s ", time.plusMinutes(i), Event.EventType.DEPARTURE, String.format("D%03d", flightId++)); } } } catch (FileNotFoundException e) { e.printStackTrace(); } } /** * Reads and processes the specified flight event file. * @param filename path to the flight event file. */ public abstract void processEventFile(String filename); /** * Returns an array of all flights processed * * @return array of all flights processed */ public abstract Event[] getFlightsHandled(); } Event Class: import java.time.LocalTime; public interface Event { public enum EventType { /** * Runway is available */ RUNWAY_AVAIL, /** * Runway is assigned to a flight */ RUNWAY_ASSIGN, /** * Arrival Flight */ ARRIVAL, /** * Departure Flight */ DEPARTURE, } /** * Returns the actual time of the arrival or departure. Note: the for RUNWAY_AVAL event the * scheduled time is the actual time * @return the actualTime */ LocalTime getActualTime(); /** * Returns the event type for this flight event * @return the event type for this flight event */ EventType getEvent(); /** * Returns the identifier for this flight event * @return the ident the flight or runway identifier for this event */ String getIdent(); /** * Returns the schedule time for this event * @return the scheduledTime the scheduled time for this event */ LocalTime getScheduledTime(); } Assignment: Create a AirportSimulator class that extends the provided Airport abstract class Feature Signature Requirement Constructor AirportSimulator (int numRunways) Precondition: numRunways >= 1; Postcondition: airport simulator with specified number of runways and default arrival and departure runway reserve times; AirportSimulator(int numRunways, int arrivalReserveTime, int departureReserveTime) Precondition: numRunways >= 1, arrivalReserveTime >= 1, departureReserveTime >= 1; Postcondition: airport simulator with specified number of runways and arrival and departure runway reserve times (in minutes); Methods public void processEventFile(String filename) Precondition: filename contains path to the events file; events file is pipe-delimited file containing the scheduled time, event type (ARRIVAL or DEPARTURE) and a Flight ID. public Event[] getFlightsHandled(); Returns an array of all flights processed

Explanation / Answer

//EventImpl

import java.time.LocalTime;

public class EventImpl implements Event{

private LocalTime actualTime;
private EventType eventType;
private String ident;
private LocalTime scheduledTime;

public EventImpl(LocalTime scheduledTime, EventType eventType, String ident) {
this.scheduledTime=scheduledTime;
this.eventType=eventType;
this.ident=ident;
}
  
@Override
public LocalTime getActualTime() {
return actualTime;
}

@Override
public EventType getEvent() {
return eventType;
}

@Override
public String getIdent() {
return ident;
}

@Override
public LocalTime getScheduledTime() {
return scheduledTime;
}
  
}

//?AirportSimulator

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.time.LocalTime;
import java.util.ArrayList;
import airportsimulator.Event.EventType;

public class AirportSimulator extends Airport {

private int numRunways;
private int arrivalReserveTime;
private int departureReserveTime;
private ArrayList events;

public static void main(String[] args) {
// TODO code application logic here
}

public AirportSimulator(int numRunways) {
if (numRunways < 1) {
return;
}
this.numRunways = numRunways;
}

AirportSimulator(int numRunways, int arrivalReserveTime, int departureReserveTime) {
if (numRunways < 1 || arrivalReserveTime < 1 || departureReserveTime < 1) {
return;
}
this.numRunways = numRunways;
this.arrivalReserveTime = arrivalReserveTime;
this.departureReserveTime = departureReserveTime;
}

@Override
public void processEventFile(String filename) {
try {
FileReader fileReader = new FileReader(filename);

BufferedReader bufferedReader = new BufferedReader(fileReader);
String line;

while ((line = bufferedReader.readLine()) != null) {
String data []= line.split("|");
EventImpl event = new EventImpl(LocalTime.parse(data[0]), EventType.valueOf(data[1]) , data[2]);
events.add(event);
}

bufferedReader.close();
} catch (FileNotFoundException ex) {
System.out.println("Unable to open file '" + filename + "'");
} catch (IOException ex) {
System.out.println("Error reading file '"+ filename + "'");
}
}

@Override
public Event[] getFlightsHandled() {
return (Event[])events.toArray();
}
}

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