Design Pattern Strategy JAVA

Strategi Pattern adalah sebuah design pattern yang memungkinkan Anda menentukan sekelompok algoritma, menempatkan masing-masing ke dalam kelas yang terpisah, dan membuat objek yang dapat dipertukarkan.

// RouteStrategy.java
public interface RouteStrategy {
    boolean pay(int paymentAmount);
    void collectPaymentDetails();
}

// PayByTransfer.java
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;

public class PayByTransfer implements RouteStrategy {
    private final BufferedReader READER = new BufferedReader(new InputStreamReader(System.in));
    private Transfer transfer;

    @Override
    public boolean pay(int paymentAmount) {
        if(pinIsInsert()) {
            System.out.println("Paying " + paymentAmount + " using Transfer");
            transfer.setAmount(transfer.getAmount() - paymentAmount);
            return true;
        }

        else {
            return false;
        }
    }

    private boolean pinIsInsert() {
        return transfer != null;
    }

    @Override
    public void collectPaymentDetails() {
        try {
            System.out.print("\nInsert PIN : ");
            String pin = READER.readLine();
            System.out.print("Code Booking : ");
            String booking = READER.readLine();
            System.out.print("Enter the number do you want to Transfer : ");
            String number = READER.readLine();
            transfer = new Transfer(pin, booking, number);
        }

        catch(IOException e) {
            e.printStackTrace();
        }
    }
}

// Transfer.java
public class Transfer {
    private int amount;
    private String pin;
    private String number;
    private String booking;

    Transfer(String pin, String number, String booking) {
        this.amount = 1000000;
        this.pin = pin;
        this.number = number;
        this.booking = booking;
    }

    public void setAmount(int amount) {
        this.amount = amount;
    }

    public int getAmount() {
        return amount;
    }
}

// PayByMarket.java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class PayByMarket implements RouteStrategy {
    private final BufferedReader READER = new BufferedReader(new InputStreamReader(System.in));
    private Market market;

    @Override
    public boolean pay(int paymentAmount) {
        if(Payed()) {
            System.out.println("Paying " + paymentAmount + " at Alfamart/Indomaret");
            market.setAmount(market.getAmount() - paymentAmount);
            return true;
        }

        else {
            return false;
        }
    }

    private boolean Payed() {
        return market != null;
    }

    @Override
    public void collectPaymentDetails() {
        try {
            System.out.print("\nEnter Code Booking : ");
            String booking = READER.readLine();
            market = new Market(booking);
        }

        catch(IOException e) {
            e.printStackTrace();
        }
    }
}

// Market.java
public class Market {
    private int amount;
    private String booking;

    Market(String booking) {
        this.booking = booking;
        this.amount = 1000000;
    }

    public int getAmount() {
        return amount;
    }

    public void setAmount(int amount) {
        this.amount = amount;
    }
}

// Order.java
public class Order {
    private int totalCost = 0;
    private boolean isClosed = false;

    public void processOrder(RouteStrategy route) {
        route.collectPaymentDetails();
    }

    public void setTotalCost(int cost) {
        this.totalCost += cost;
    }

    public int getTotalCost() {
        return totalCost;
    }

    public boolean isClosed() {
        return isClosed;
    }

    public void setClosed() {
        isClosed = true;
    }
}

// Progress.java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class Progress {
    private static Map<Integer, Integer> priceOnTickets = new HashMap<>();
    private static BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    private static Order order = new Order();
    private static RouteStrategy route;

    static {
        priceOnTickets.put(1, 96000);
        priceOnTickets.put(2, 74000);
        priceOnTickets.put(3, 350000);
    }

    public static void main(String[] args) throws IOException {
        while(!order.isClosed()) {
            int cost, count;

            String continueChoice;
            do {
                System.out.println("\t\tTRANSPORTATION's TICKET FROM JAKARTA TO YOGYAKARTA");
                System.out.print("\n\nPlease Choose Transportation : \n"
                        + "1. Bus (96.000 IDR)\n"
                        + "2. Train (74.000 IDR)\n"
                        + "3. Plane (350.000 IDR)\n"
                        + "Choose one : ");
                int choice = Integer.parseInt(reader.readLine());
                cost = priceOnTickets.get(choice);
                System.out.print("Count : ");
                count = Integer.parseInt(reader.readLine());
                order.setTotalCost(cost * count);
                System.out.print("Do you want to pay, now? Yes/No : ");
                continueChoice = reader.readLine();
            }

            while(continueChoice.equalsIgnoreCase("No"));

            if(route == null) {
                System.out.print("\nPlease select a Payment Method :\n"
                        + "1. Transfer\n"
                        + "2. Paying at Market\n"
                        + "Choose one : ");
                String paymentMethod = reader.readLine();

                if(paymentMethod.equals("1")) {
                    route = new PayByTransfer();
                }

                else {
                    route = new PayByMarket();
                }

                order.processOrder(route);

                System.out.print("\nPay " + order.getTotalCost() + " tickets or Continue shopping? Pay/No : ");
                String proceed = reader.readLine();
                if(proceed.equalsIgnoreCase("Pay")) {
                    if(route.pay(order.getTotalCost())) {
                        System.out.println("Payment has been successful");
                    }

                    else {
                        System.out.println("Error! Please check your data");
                    }

                    order.setClosed();
                }

                System.out.print("\nDo you want to print the Ticket? Yes/No : ");
                String printTicket = reader.readLine();
                if(printTicket.equalsIgnoreCase("Yes")) {
                    System.out.print("Choose your transportation? Bus/Train/Plane : ");
                    String transport = reader.readLine();
                    if(transport.equalsIgnoreCase("Bus")) {
                        System.out.println("Bus From Jakarta to Yogyakarta"
                                + "\nRoute : Cikampek, Cipali, Palimanan, Kanci, Pejagan, Purwokerto, Kebumen, Wates, Yogyakarta"
                                + "\nPrice : " + cost * count);
                    }

                    else if(transport.equalsIgnoreCase("Train")) {
                        System.out.println("Train from Jakarta to Yogyakarta"
                                + "\nRoute : Senen, Haurgeulis, Prujakan, Prupuk, Purwokerto, Kroya, Gombong, Kebumen, Kutoarjo, Wates, Yogyakarta"
                                + "\nPrice : " + cost * count);
                    }

                    else if(transport.equalsIgnoreCase("Plane")) {
                        System.out.println("Plane from Jakarta to Yogyakarta"
                                + "\nRoute : Soekarno-Hatta, Adisutjipto"
                                + "\nPrice : " + cost * count);
                    }

                    else {
                        System.out.println("FAIL! Please choose one your transportation!");
                    }
                }

                else {
                    System.out.println("Thank you for buying a ticket at here");
                }
            }
        }
    }
}