6F3B Software Engineering for Business and Mutator Object

4 outline classes

• Attendant

public class Attendant {
    private int attendantID;
    private String name;
    private boolean  availability;
    public Attendant(){}
    public void setAttendantID(int attID){
        this.attendantID=attID;
    }
    public int getAttendantID(){
        return this.attendantID;
    }
    public void setName(String attName){
        this.name=attName;
    }
    public String getName(){
        return this.name;
    }
    public String toString(){
        return this.name+" - :"+attendantID;
    }
    public void setAvailability(boolean status){
        this.availability=status;
    }
    public boolean getAvailability(){
        return this.availability;
    }
}

• Driver
• public class Driver {
  private String licensePlate;
      public Driver(){}
      public void setlicensePlate(String plateNumber){
          this.licensePlate=plateNumber;
      }
      public String getLicensePlate(){
          return this.licensePlate;
      }
  
  }

• DisabledDriver

public class DisabledDriver extends Driver {
    private boolean status;
    public DisabledDriver(){}
    public void setStatus(boolean status){
        this.status=status;
    }
    public boolean getStatus(){
        return this.status;
    }
}

• Loader
• import io.BufferedReader;
  import java.io.FileReader;
  import java.io.IOException;
  import java.util.ArrayList;
  
  public class Loader {
  public Loader(){}
      private  String [] readFile(String filename) throws IOException {
          BufferedReader br=null;
          try{
              br=new BufferedReader(new FileReader(filename));
              StringBuilder sb=new StringBuilder();
              String line=br.readLine();
              while(line!=null){
                  sb.append(line);
                  sb.append("n");
                  line=br.readLine();
              }
              String everything=sb.toString();
              String [] blocks=everything.split("n");
              return blocks;
          }catch (Exception e){
              e.printStackTrace();
              return null;
  
          }finally{
              br.close();
          }
  
      }
      public ArrayList  populateData(String filename) throws IOException{
          ArrayList data=new ArrayList<>();
          String arr[]=readFile(filename);
          for (int i=0;i<arr.length;i++){
              String[] details=arr[i].split("~");
              ArrayList datum=new ArrayList();
              for (int j=0;j<details.length;j++){
                  datum.add(details[j]);
              }
              data.add(datum);
          }
          return data;
      }
  }

• Receipt

public class Receipt {
    private String receiptNO;
    private Space space;
    private String arrivalTime;
    private String exitTime;
    private DisabledDriver driver;
    private double amount;
    private Zone zone;
    private Attendant attendant;
    private Vehicle userVehicle;
    public Receipt(){
        this.attendant=null;
        this.exitTime="000000";
    }
    public void setReceiptNO(String receiptno){
        this.receiptNO=receiptno;
    }
    public String getReceiptNO(){
        return this.receiptNO;
    }
    public void setSpace(Space space){
        this.space=space;
    }
    public Space getSpace(){
        return this.space;
    }
    public void setArrivalTime(String arrivaltime){
        this.arrivalTime=arrivaltime;
    }
    public String getArrivalTime(){
        return this.arrivalTime;
    }
    public void seExitTime(String exittime){
        this.exitTime=exittime;
    }
    public String getExitTime(){
        return this.exitTime;
    }
    public void setDriver(DisabledDriver dr){
        this.driver=dr;
    }
    public Driver getDriver(){
        return this.driver;
    }
    public void setAttendant(Attendant att){
        this.attendant=att;
    }
    public void setAmount(double amt){
        this.amount=amt;
    }
    public double getAmount(){
        return this.amount;
    }
    public void setUserVehicle(Vehicle vehicle){
        this.userVehicle=vehicle;
    }
    public Vehicle getUserVehicle(){
        return this.userVehicle;
    }
    public void setZone(Zone zone){
        this.zone=zone;
    }
    public Zone getZone(){
        return this.zone;
    }
    public void displayReceipt(){
        System.out.println("***************************Parking Receipt***********************");
        System.out.println("Receipt NO: "+receiptNO);
        System.out.println("Vehicle License plate: "+driver.getLicensePlate());
        System.out.println("Disability : "+driver.getStatus());
        System.out.println("Arrival Time: "+getTime(arrivalTime));
        System.out.println("Exit time: "+getTime(exitTime));
        System.out.println("Amount: "+amount);
        System.out.println("**************Your allocated space is****************************");
        System.out.println("ZoneID :"+zone.getZoneID()+" ("+zone.getType()+")");
        System.out.println("Space: "+space.getSpaceID());
        System.out.println("Serverd by: "+attendant.getName());
        System.out.println("Thank you for choosing MCP");
    }
    public String getTime(String time){
        long millis = Long.parseLong(time) % 1000;
        long second = (Long.parseLong(time) / 1000) % 60;
        long minute = (Long.parseLong(time) / (1000 * 60)) % 60;
        long hour = (Long.parseLong(time) / (1000 * 60 * 60)) % 24;

        String timeFormat = String.format("%02d:%02d:%02d.%d", hour, minute, second, millis);
        return timeFormat;
    }
}

• Space
• public class Space {
  private int spaceID;
      private boolean avaialability;
      public Space(){}
      public void setSpaceID(int spaceNO){
          this.spaceID=spaceNO;
      }
      public int getSpaceID(){
          return this.spaceID;
      }
      public void setAvaialability(boolean status){
          this.avaialability=status;
      }
      public boolean getAvailability(){
          return this.avaialability;
      }
      public String toString(){
          return this.spaceID+" : "+this.avaialability;
      }
  }

• Vehicle

public class Vehicle {
    private int vehicleID;
    private String type;
    private double rate;
    public Vehicle (){}
    public void setVehicleID(int vID){
        this.vehicleID=vID;
    }
    public int getVehicleID(){
        return this.vehicleID;
    }
    public void setType(String vType){
        this.type=vType;
    }
    public String getType(){
        return this.type;
    }
    public void setRate(double vRate){
        this.rate=vRate;
    }
    public double getRate(){
        return this.rate;
    }
}

• Zone
• import util.ArrayList;
  
  public class Zone {
  private int zoneID;
      private String type;
      private ArrayList vehicles;
      private ArrayList spaces;
      public Zone(){
          vehicles=new ArrayList<>();
          spaces=new ArrayList<>();
      }
      public void setZoneID(int zoneNO){
          this.zoneID=zoneNO;
      }
      public int getZoneID(){
          return this.zoneID;
      }
      public void setType(String zoneType){
          this.type=zoneType;
      }
      public String getType(){
          return this.type;
      }
      public void setVehicles(Vehicle vehicle){
          this.vehicles.add(vehicle);
      }
      public ArrayList getVehicles(){
          return this.vehicles;
      }
      public ArrayList getSpaces(){
          return this.spaces;
      }
      public void setSpaces(Space space){
          this.spaces.add(space);
      }
  
  }

• MCP
• import io.IOException;
  import java.util.ArrayList;
  import java.util.Random;
  import java.util.Scanner;
  
  public class MCP {
  private ArrayList vehicleData=new ArrayList<>();
      private ArrayList zoneData=new ArrayList<>();
      private ArrayList attendantData=new ArrayList<>();
      private ArrayList receipts=new ArrayList<>();
      public MCP(){
  
      }
      public static void main(String[] args) throws IOException {
          System.out.println("Welcome to MCP parking");
          MCP mcp=new MCP();
          mcp.startup();
          mcp.menu();
      }
      public void menu(){
          System.out.println("*********************MENU*************");
          Scanner s=new Scanner(System.in);
          System.out.println("1 Find Parking");
          System.out.println("2 Exit parking");
          try {
              int option = s.nextInt();
              if(option==1){
                  findParking();
              }else if(option==2){
                  exitParking();
              }else{
                  System.out.println("Invalid option");
                  menu();
              }
          }catch(NumberFormatException e){
              System.out.println("Use numbers only specified in the menu only");
          }
      }
  
      public void findParking(){
          System.out.println("Do you want to be assisted by an attendant? (Y=yes, N=No");
          Scanner s=new Scanner(System.in);
          String option=s.next();
          if(option.equalsIgnoreCase("y")){
              Random random=new Random();
              int randomNumber = random.nextInt(attendantData.size() - 1) + 1;
              Attendant attendant=attendantData.get(randomNumber);
              parkVehicle(attendant);
  
          }else if(option.equalsIgnoreCase("n")){
              //no attendant
              parkVehicle();
          }else{
              System.out.println("Invalid option");
              findParking();
          }
      }
  
      public void parkVehicle(){
          Scanner s=new Scanner(System.in);
          System.out.println("Enter the license plate of the vehicle");
          String licensePlate=s.next();
          System.out.println("Do you have any disability? (Y=Yes, N=No");
          String option=s.next();
          boolean opt=false;
          if(option.equalsIgnoreCase("y")){
              opt=true;
          }else if(option.equalsIgnoreCase("n")){
              opt=false;
          }else{
              System.out.println("Invalid option");
              System.out.println("Do you have any disability? (Y=Yes, N=No");
              option=s.next();
              if(option.equalsIgnoreCase("y")){
                  opt=true;
              }else if(option.equalsIgnoreCase("n")){
                  opt=false;
              }
          }
          DisabledDriver driver=new DisabledDriver();
          driver.setlicensePlate(licensePlate);
          driver.setStatus(opt);
  
          System.out.println("Select you vehicle type");
          Vehicle driverVehicle=null;
          for(int i=0;i<vehicleData.size();i++){
              System.out.println(i+" "+vehicleData.get(i).getType());
  
          }
          int selectedVehicle;
          try {
               selectedVehicle = s.nextInt();
              if (selectedVehicle>=0 && selectedVehicle<=vehicleData.size()){
                  driverVehicle=vehicleData.get(selectedVehicle);
  
              }else{
                  System.out.println("Invalid option Select vehicle");
                  for(int i=0;i<vehicleData.size();i++){
                      System.out.println(i+" "+vehicleData.get(i).getType());
  
                  }
                   selectedVehicle = s.nextInt();
                  if (selectedVehicle>=0 && selectedVehicle<=vehicleData.size()){
                      driverVehicle=vehicleData.get(selectedVehicle);
  
                  }else{
                      System.out.println("Invalid option Select vehicle");
                      for(int i=0;i<vehicleData.size();i++){
                          System.out.println(i+" "+vehicleData.get(i).getType());
  
                      }
                  }
              }
          }catch (NumberFormatException e){
              System.out.println("Use numbers only");
          }
  
          showParkingLots();
  
          //show parking lots
          System.out.println("Select parking lot option");
          Zone customerZone=null;
          Space customerSpace=null;
          try{
              int selectedZone=s.nextInt();
              if(selectedZone==0){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if(selectedZone==1){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if(selectedZone==2){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if (selectedZone==3){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if(selectedZone==4){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if (selectedZone==5){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else{
                  System.out.println("Invalid option, select zone using the specified zoneID");
              }
          }catch(NumberFormatException e){
              System.out.println("Only numbers are allowed");
          }
          Receipt receipt=new Receipt();
          Random rand = new Random();
          int  receiptNO = rand.nextInt(500000) + 1;
          receipt.setReceiptNO(String.valueOf(receiptNO));
          receipt.setSpace(customerSpace);
          receipt.setZone(customerZone);
          receipt.setArrivalTime(String.valueOf(System.currentTimeMillis()));
          receipt.setDriver(driver);
          receipt.setUserVehicle(driverVehicle);
          receipt.setAttendant(null);
          receipts.add(receipt);
          receipt.displayReceipt();
          menu();
      }
      public void parkVehicle(Attendant attendant){
          Scanner s=new Scanner(System.in);
          System.out.println("Enter the license plate of the vehicle");
          String licensePlate=s.next();
          System.out.println("Do you have any disability? (Y=Yes, N=No");
          String option=s.next();
          boolean opt=false;
          if(option.equalsIgnoreCase("y")){
              opt=true;
          }else if(option.equalsIgnoreCase("n")){
              opt=false;
          }else{
              System.out.println("Invalid option");
              System.out.println("Do you have any disability? (Y=Yes, N=No");
              option=s.next();
              if(option.equalsIgnoreCase("y")){
                  opt=true;
              }else if(option.equalsIgnoreCase("n")){
                  opt=false;
              }
          }
          DisabledDriver driver=new DisabledDriver();
          driver.setlicensePlate(licensePlate);
          driver.setStatus(opt);
  
          System.out.println("Select you vehicle type");
          Vehicle driverVehicle=null;
          for(int i=0;i<vehicleData.size();i++){
              System.out.println(i+" "+vehicleData.get(i).getType());
          }
          int selectedVehicle;
          try {
              selectedVehicle = s.nextInt();
              if (selectedVehicle>=0 && selectedVehicle<=vehicleData.size()){
                  driverVehicle=vehicleData.get(selectedVehicle);
              }else{
                  System.out.println("Invalid option Select vehicle");
                  for(int i=0;i<vehicleData.size();i++){
                      System.out.println(i+" "+vehicleData.get(i).getType());
                  }
                  selectedVehicle = s.nextInt();
                  if (selectedVehicle>=0 && selectedVehicle<=vehicleData.size()){
                      driverVehicle=vehicleData.get(selectedVehicle);
                  }else{
                      System.out.println("Invalid option Select vehicle");
                      for(int i=0;i<vehicleData.size();i++){
                          System.out.println(i+" "+vehicleData.get(i).getType());
                      }
                  }
              }
          }catch (NumberFormatException e){
              System.out.println("Use numbers only");
          }
          showParkingLots();
          //show parking lots
          System.out.println("Select parking lot option");
          Zone customerZone=null;
          Space customerSpace=null;
          try{
              int selectedZone=s.nextInt();
              if(selectedZone==0){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if(selectedZone==1){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if(selectedZone==2){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if (selectedZone==3){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if(selectedZone==4){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else if (selectedZone==5){
                  customerZone=zoneData.get(selectedZone);
                  customerSpace=findEmptyParkingSpace(customerZone);
              }else{
                  System.out.println("Invalid option, select zone using the specified zoneID");
              }
          }catch(NumberFormatException e){
              System.out.println("Only numbers are allowed");
          }
          Receipt receipt=new Receipt();
          Random rand = new Random();
          int  receiptNO = rand.nextInt(500000) + 1;
          receipt.setReceiptNO(String.valueOf(receiptNO));
          receipt.setSpace(customerSpace);
          receipt.setZone(customerZone);
          receipt.setArrivalTime(String.valueOf(System.currentTimeMillis()));
          receipt.setDriver(driver);
          receipt.setUserVehicle(driverVehicle);
          receipt.setAttendant(attendant);
          receipts.add(receipt);
          receipt.displayReceipt();
          attendantData.remove(attendant);
          menu();
      }
      public Space findEmptyParkingSpace(Zone zone){
          Space value=null;
          for(int i=0;i<50;i++){
              Space space= (Space) zone.getSpaces().get(i);
              if(space.getAvailability()==true){
                  value=space;
                  space.setAvaialability(false);
                  break;
              }
          }
          zone.getSpaces().remove(value);
          zone.getSpaces().add(value);
          zoneData.remove(zone);
          zoneData.add(zone);
          return value;
      }
      public void showParkingLots(){
          for (int i=0;i<zoneData.size();i++){
              System.out.println("Option: "+i);
              System.out.println("Zone ID: "+zoneData.get(i).getZoneID()+" "+zoneData.get(i).getType());
              System.out.println("Type of vehicles accepted: ");
              for(int k=0;k<zoneData.get(i).getVehicles().size();k++){
                  Vehicle vehicle= (Vehicle) zoneData.get(i).getVehicles().get(k);
                  System.out.append(vehicle.getType()+" n");
              }
              System.out.println("Spaces (True means the space is available and false means its not)");
  
              for(int j=0;j<zoneData.get(i).getSpaces().size();j++){
                  if(j%10==0){
                      System.out.println();
                  }
                  System.out.print("t "+zoneData.get(i).getSpaces().get(j).toString());
              }
              System.out.println("n");
          }
      }
  
      public void exitParking(){
          System.out.println("Enter your receiptNO (Token)");
          Scanner s=new Scanner(System.in);
          String token=s.next();
          Receipt receipt=findReceipt(token);
          if(receipt==null){
              System.out.println("invaid receipt no or token..Refer to your receipt");
              menu();
          }else{
              receipt.seExitTime(String.valueOf(System.currentTimeMillis()));
              long timeDiff=Long.parseLong(receipt.getExitTime())-Long.parseLong(receipt.getArrivalTime());
              long diffInSeconds=timeDiff/1000;
              Double amount= Double.valueOf(0);
              if(diffInSeconds%3600==0){
                  amount=(diffInSeconds/3600)*getRate(receipt.getUserVehicle());
              }else{
                  amount=(diffInSeconds/3600)*getRate(receipt.getUserVehicle())+1*getRate(receipt.getUserVehicle());
              }
              receipt.setAmount(amount);
              System.out.println("Charges for your parking ="+receipt.getAmount() );
              System.out.println("Enter your payment (should be the exact as specified)");
              Double userAmount;
              try {
                  userAmount=s.nextDouble();
                  if(userAmountamount){
                      System.out.println("Incorrect amount");
                      System.out.println("Charges for your parking ="+receipt.getAmount() );
                      System.out.println("Enter your payment (should be the exact as specified)");
                      userAmount=s.nextDouble();
                      if(userAmountamount){
                          System.out.println("Incorrect amount");
                          System.out.println("Charges for your parking ="+receipt.getAmount() );
                          System.out.println("Enter your payment (should be the exact as specified)");
                          userAmount=s.nextDouble();
                      }else{
                          System.out.println("Payment made");
                      }
                  }else{
                      System.out.println("Payment made");
                  }
              }catch(Exception e){
                  System.out.println("Use numbers only");
              }
              receipt.displayReceipt();
              System.out.println("Exit parking within the next fifteen minutes");
              System.out.println("Press 1 to raise barrier");
              String exitOption=s.next();
              if(exitOption.equalsIgnoreCase("1")){
                  long currentTime=System.currentTimeMillis();
                  long diff=(currentTime-Long.parseLong(receipt.getExitTime()))/1000;
                  if(diff>15*60){
                      System.out.println("You have exceeded 15 minutes from the time you paid..Seek assistance from an attendant");
                  }else{
                      System.out.println("Raising barrier..Bye");
                  }
              }
              menu();
  
  
          }
      }
      public Double getRate(Vehicle vehicle){
          Double rate=0.0;
          for(int i=0;i<vehicleData.size();i++){
              if(vehicleData.get(i)==vehicle){
                  rate=vehicleData.get(i).getRate();
              }
          }
          return rate;
      }
      public Receipt findReceipt(String receiptNO){
          Receipt receipt=null;
          for(int i=0;i<receipts.size();i++){
              if(receipts.get(i).getReceiptNO().equalsIgnoreCase(receiptNO)){
                  receipt=receipts.get(i);
              }
          }
          return receipt;
      }
      public void startup() throws IOException {
          Loader loader=new Loader();
          //loading the vehicle types
          ArrayList vehicles=loader.populateData("./src/vehicles.txt");
          for (int i=0;i<vehicles.size();i++){
  
              Vehicle vehicle=new Vehicle();
                 vehicle.setVehicleID(Integer.parseInt(vehicles.get(i).get(0).toString()));
                  vehicle.setType(vehicles.get(i).get(1).toString());
                  vehicle.setRate(Double.parseDouble(vehicles.get(i).get(2).toString()));
              vehicleData.add(vehicle);
          }
          //loading the zone types
         ArrayList zones=loader.populateData("./src/zones.txt");
          for (int i=0;i<zones.size();i++){
              Zone zone=new Zone();
                  zone.setZoneID(Integer.parseInt(zones.get(i).get(0).toString()));
                  zone.setType(zones.get(i).get(1).toString());
                  String[] cars=zones.get(i).get(2).toString().split(",");
                  for (int k=0;k<cars.length;k++){
                      for(int l=0;l<vehicleData.size();l++){
                          if(Integer.toString(vehicleData.get(l).getVehicleID()).equals(cars[k])){
                              zone.setVehicles(vehicleData.get(l));
                          }
                      }
                  }
                  for(int l=0;l<50;l++){
                      Space space=new Space();
                      space.setSpaceID(l);
                      space.setAvaialability(true);
                      zone.setSpaces(space);
                  }
              zoneData.add(zone);
          }
  
  
          //
  
          //loading space
          ArrayList attendants=loader.populateData("./src/attendant.txt");
          for (int i=0;i<attendants.size();i++){
              Attendant attendant=new Attendant();
                  attendant.setAttendantID(Integer.parseInt(attendants.get(i).get(0).toString()));
                  attendant.setName(attendants.get(i).get(1).toString());
                  attendant.setAvailability(true);
              attendantData.add(attendant);
          }
      }
  }

5 Evaluation

The implementation of the proposed MCP system was both very informative and came with some challenges. The stages involved in making the system from the requirements gathering stage to the implementation and testing stage all came with a lot of lessons for me. I discovered that modelling a system using Unified Modelling Language (UML) for example by use of use case diagrams to show the interaction of different users with the system and use of the class diagram to show the possible classes making up the process is the right way to follow when doing any project. This is because following these steps enabled me to get all the requirements of the proposed system before I started the actual implementation. The class diagram also helped me with the during the implementation stage because the structure of the system was already defined thus the coding part was simplified by following the structure. After the implementation was complete, the tests prepared before the implementation stage acted as checkpoints to verify and validate the system against the requirements.

Use of inheritance in my program is the most sophisticated feature in the program. Inheritance helped me to reduce code repetition. Although understanding the actual working of the classes with inheritance was a bit technical for me, I got to understand it more after a few uses. Use of classes to emulate real life objects made the end system to achieve all functionalities required in the requirements.