update,

_resources/it114105/itp4507/Assignment/20-21/src/Caretaker.java

@@ -0,0 +1,35 @@
+
+import java.util.Stack;
+
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+/**
+ *
+ * @author jerrykwok
+ */
+public class Caretaker {
+
+    private Stack<LunchSetMemento> undoList;
+
+    public Caretaker() {
+        undoList = new Stack();
+    }
+
+    public void saveLunchSet(LunchSetMemento lunchSetMemento) {
+        undoList.push(lunchSetMemento);
+    }
+
+    public void undo() {
+        if (undoList.isEmpty()) {
+            System.out.println("UndoList is Empty");
+            return;
+        }
+        LunchSetMemento obj = undoList.pop();
+
+        obj.restore();
+    }
+
+}

_resources/it114105/itp4507/Assignment/20-21/src/ChineseStyleLunchSet.java

@@ -0,0 +1,45 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+public class ChineseStyleLunchSet extends LunchSet{
+    
+    public ChineseStyleLunchSet(String mainDish, int price, int availableCount) {
+        super(mainDish, price, availableCount);
+    }
+    
+    public static String getDrink(String drinkCode){
+        String drink = "";
+        switch(drinkCode){
+            case "h":
+                drink = "Hot Tea";
+                break;
+            case "i":
+                drink = "Iced Tea";
+        }
+        return drink;
+    }
+    
+    public String getSideDish(){
+        return "rice, Chinese soup, Chinese tea";
+    }
+    
+    public String getDetails(){
+        return "Chinese style Business Set Lunch\n" +
+                "main dish: " + super.getMainDish() + "\n"
+                + "with " + getSideDish() + "\n" +
+                "price: " + super.getPrice() + "\n"
+                + "available count: " + super.getAvailableCount();          
+    }
+    
+    public LunchSetChineseStyleMemento saveMemento(){
+        return new LunchSetChineseStyleMemento(this);
+    }
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/CmdCancelOrder.java

@@ -0,0 +1,30 @@
+
+import java.util.Scanner;
+
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class CmdCancelOrder implements Command{
+
+    private Scanner input;
+
+    public CmdCancelOrder(Scanner input) {
+        this.input = input;
+    }
+    
+    @Override
+    public void execute() {
+       System.out.println("Cancel Order");
+       System.out.print("Staff Number: ");
+       String staffNumber = input.nextLine();
+       StaffCanteen.getInstance().cancelOrder(staffNumber);
+    }
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/CmdEditMenu.java

@@ -0,0 +1,42 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+import java.util.ArrayList;
+import java.util.Scanner;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class CmdEditMenu implements Command{
+    
+    private Scanner input;
+    
+    public CmdEditMenu(Scanner input){
+        this.input = input;
+    }
+        
+    public void execute() {
+        try {
+            System.out.println("\nEdit Menu");
+            System.out.print("Chinese or Western (c | w): ");
+            String typeLunchSet = input.nextLine();
+            System.out.print("Enter main dish: ");
+            String mainDish = input.nextLine();
+            System.out.print("Enter price: ");
+            int price = Integer.parseInt(input.nextLine());
+            System.out.print("Enter available count: ");
+            int available = Integer.parseInt(input.nextLine());
+            StaffCanteen.getInstance().editMenu(typeLunchSet, mainDish, price, available);
+            System.out.println("Menu Updated");
+        } catch (LunchSetStyleException ex) {
+            System.out.println(ex.getMessage());
+        }
+        
+    }    
+}

_resources/it114105/itp4507/Assignment/20-21/src/CmdExit.java

@@ -0,0 +1,17 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class CmdExit implements Command {
+
+    @Override
+    public void execute() {
+        System.exit(0);
+    }
+}

_resources/it114105/itp4507/Assignment/20-21/src/CmdListOrder.java

@@ -0,0 +1,18 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class CmdListOrder implements Command{
+
+    @Override
+    public void execute() {
+        StaffCanteen.getInstance().listOrder();
+    }
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/CmdOrderIsDone.java

@@ -0,0 +1,15 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class CmdOrderIsDone implements Command{
+    public void execute(){
+        StaffCanteen.getInstance().orderDone();
+    }
+}

_resources/it114105/itp4507/Assignment/20-21/src/CmdPlaceOrder.java

@@ -0,0 +1,63 @@
+
+import java.util.Scanner;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+/**
+ *
+ * @author jerrykwok
+ */
+public class CmdPlaceOrder implements Command {
+
+    private Scanner input;
+
+    public CmdPlaceOrder(Scanner input) {
+        this.input = input;
+    }
+
+    @Override
+    public void execute() {
+        try {
+            System.out.println("\nPlace Order");
+            System.out.print("Chinese or Western (c | w): ");
+            String menuType = input.nextLine();
+            if(StaffCanteen.getInstance().searchMenuAvaiable(menuType) == 0){
+                System.out.println("Sold Out!");
+                return;
+            }
+            String drinkCode;
+            String sideCode = null;
+            String staffNumber;
+            String officeLocation;
+            switch (menuType) {
+                case "c":
+                    System.out.print("Oolong Tea: hot or iced (h | i): ");
+                    drinkCode = input.nextLine();
+                    break;
+                case "w":
+                    System.out.print("side: rice, spaghetti, French fries (r | s | f): ");
+                    sideCode = input.nextLine();
+                    System.out.print("tea or coffee, hot or iced (ht| it | hc | ic): ");
+                    drinkCode = input.nextLine();
+                    break;
+                default:
+                    throw new LunchSetStyleException();
+            }
+            System.out.print("Staff Number: ");
+            staffNumber = input.nextLine();
+            System.out.print("Office Location: ");
+            officeLocation = input.nextLine();
+            Order order = (menuType.equals("c")) ? StaffCanteen.getInstance().placeChineseLunchSetOrder(drinkCode, staffNumber, officeLocation) 
+                    : StaffCanteen.getInstance().placeWesternLunchSetOrder(drinkCode, sideCode, staffNumber, officeLocation);
+            System.out.println("Order Placed");
+        } catch (LunchSetStyleException ex) {
+            System.out.println(ex.getMessage());
+        }
+    }
+
+}

_resources/it114105/itp4507/Assignment/20-21/src/CmdShowMenu.java

@@ -0,0 +1,15 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class CmdShowMenu implements Command{
+    public void execute(){
+        StaffCanteen.getInstance().printMenu();
+    }
+}

_resources/it114105/itp4507/Assignment/20-21/src/Command.java

@@ -0,0 +1,13 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+public interface Command {
+    public void execute();
+}

_resources/it114105/itp4507/Assignment/20-21/src/CommandFactory.java

@@ -0,0 +1,134 @@
+
+import java.util.Scanner;
+
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public interface CommandFactory {
+    public String getCommnadDesc();
+    public Command createCommand();
+}
+
+class EditMenuCommandFactory implements CommandFactory{
+
+    private Scanner input;
+    
+    public EditMenuCommandFactory(Scanner input){
+        this.input = input;
+    }
+    
+    @Override
+    public String getCommnadDesc() {
+        return "Edit menu, ";
+    }
+
+    @Override
+    public Command createCommand() {
+        return new CmdEditMenu(input);
+    }
+    
+}
+
+class ShowMenuCommandFactory implements CommandFactory{
+
+    @Override
+    public String getCommnadDesc() {
+        return "Show menu, ";
+    }
+
+    @Override
+    public Command createCommand() {
+        return new CmdShowMenu();
+    }
+    
+}
+
+class PlaceOrderCommandFactory implements CommandFactory{
+
+    private Scanner input;
+
+    public PlaceOrderCommandFactory(Scanner input) {
+        this.input = input;
+    }
+    
+    
+    @Override
+    public String getCommnadDesc() {
+        return "Place order, ";
+    }
+
+    @Override
+    public Command createCommand() {
+        return new CmdPlaceOrder(input);
+    }
+    
+}
+
+
+class CancelOrderCommandFactory implements CommandFactory{
+    private Scanner input;
+
+    public CancelOrderCommandFactory(Scanner input) {
+        this.input = input;
+    }
+
+    @Override
+    public String getCommnadDesc() {
+       return "Cancel order, ";
+    }
+
+    @Override
+    public Command createCommand() {
+       return new CmdCancelOrder(input);
+    }
+    
+}
+
+class ListOrdersCommandFactory implements CommandFactory{
+
+    @Override
+    public String getCommnadDesc() {
+        return "List orders, ";
+    }
+
+    @Override
+    public Command createCommand() {
+        return new CmdListOrder();
+    }
+
+}
+
+class OrderIsDoneCommandFactory implements CommandFactory{
+
+    @Override
+    public String getCommnadDesc() {
+        return "order is Done, ";
+    }
+
+    @Override
+    public Command createCommand() {
+       return new CmdOrderIsDone();
+    }
+    
+}
+
+class ExitCommandFactory implements CommandFactory{
+
+    @Override
+    public String getCommnadDesc() {
+        return "Quit";
+    }
+
+    @Override
+    public Command createCommand() {
+        return new CmdExit();
+    }
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/CommandHandler.java

@@ -0,0 +1,47 @@
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+/**
+ *
+ * @author jerrykwok
+ */
+public class CommandHandler {
+
+    private LinkedHashMap<String, CommandFactory> mapCmds;
+
+    public CommandHandler() {
+        this.mapCmds = new LinkedHashMap<String, CommandFactory>();
+    }
+
+    public void regCommand(String key, CommandFactory cmdFactory) {
+        mapCmds.put(key, cmdFactory);
+    }
+
+    public void printCommandList() {
+        System.out.print("Please enter command: [");
+        System.out.print(String.join(" | ", mapCmds.keySet()));
+        System.out.println("]");
+        for (Map.Entry<String, CommandFactory> mapCmd : mapCmds.entrySet()) {
+            System.out.print(mapCmd.getKey() + " = " + mapCmd.getValue().getCommnadDesc());
+        }
+        System.out.println();
+    }
+    
+    public boolean run(String cmd) {
+        CommandFactory commandFactory = mapCmds.get(cmd);
+        if (commandFactory != null) {
+            Command command = commandFactory.createCommand();
+            command.execute();
+            
+            return true;
+        }
+
+        return false;
+    }
+}

_resources/it114105/itp4507/Assignment/20-21/src/LunchSet.java

@@ -0,0 +1,54 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+public abstract class LunchSet {
+    private String mainDish;
+    private int price;
+    private int availableCount;
+
+    public LunchSet(String mainDish, int price, int availableCount) {
+        this.mainDish = mainDish;
+        this.price = price;
+        this.availableCount = availableCount;
+    }
+
+    public String getMainDish() {
+        return mainDish;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public int getAvailableCount() {
+        return availableCount;
+    }
+    
+    public void setAvailableCount(int availableCount){
+        this.availableCount = availableCount;
+    }
+
+    public void setMainDish(String mainDish) {
+        this.mainDish = mainDish;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+    
+    
+    public void reduceOneAvailableCount(){
+        availableCount--;
+    }
+    
+    public abstract String getSideDish();
+    public abstract String getDetails();
+    public abstract LunchSetMemento saveMemento();
+}

_resources/it114105/itp4507/Assignment/20-21/src/LunchSetChineseStyleMemento.java

@@ -0,0 +1,35 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class LunchSetChineseStyleMemento implements LunchSetMemento{
+    
+    private String mainDish;
+    private int price;
+    private int availableCount;
+    private LunchSet lunchSet;
+    
+    public LunchSetChineseStyleMemento(ChineseStyleLunchSet lunchSet){
+        this.mainDish = lunchSet.getMainDish();
+        this.price = lunchSet.getPrice();
+        this.availableCount = lunchSet.getAvailableCount();
+        this.lunchSet = lunchSet;
+    }
+    
+    @Override
+    public LunchSet getOrig() {
+        return lunchSet;
+    }
+
+    @Override
+    public void restore() {
+        lunchSet.setAvailableCount(availableCount);
+    }
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/LunchSetMemento.java

@@ -0,0 +1,14 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public interface LunchSetMemento {
+    public LunchSet getOrig();
+    public void restore();
+}

_resources/it114105/itp4507/Assignment/20-21/src/LunchSetStyleException.java

@@ -0,0 +1,15 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+public class LunchSetStyleException extends Exception{
+    public LunchSetStyleException(){
+        super("Please input c or w");
+    }
+}

_resources/it114105/itp4507/Assignment/20-21/src/LunchSetWesternStyleMemento.java

@@ -0,0 +1,36 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class LunchSetWesternStyleMemento implements LunchSetMemento{
+
+    private String mainDish;
+    private int price;
+    private int availableCount;
+    private LunchSet lunchSet;
+
+    public LunchSetWesternStyleMemento(WesternStyleLunchSet lunchSet) {
+        this.mainDish = lunchSet.getMainDish();
+        this.price = lunchSet.getPrice();
+        this.availableCount = lunchSet.getAvailableCount();
+        this.lunchSet = lunchSet;
+    }
+
+       
+    @Override
+    public LunchSet getOrig() {
+        return lunchSet;
+    }
+
+    @Override
+    public void restore() {
+        lunchSet.setAvailableCount(availableCount);
+    }
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/Main.java

@@ -0,0 +1,48 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+import java.util.Scanner;
+
+public class Main {
+    
+    private static Scanner input;
+    private static CommandHandler ch;
+    
+    
+    public static void main(String[] args){
+        input = new Scanner(System.in);
+        ch = initCommand();
+        run();
+    }
+    
+    public static void run(){
+        while (true) {
+          ch.printCommandList();
+          String cmd = input.nextLine();
+          boolean result = ch.run(cmd);
+          if (!result) {
+              System.out.println("No Command Match");
+          }
+          System.out.println("");
+      }
+    }
+    
+    public static CommandHandler initCommand() {
+        CommandHandler ch = new CommandHandler();
+        ch.regCommand("e", new EditMenuCommandFactory(input));
+        ch.regCommand("s", new ShowMenuCommandFactory());
+        ch.regCommand("p", new PlaceOrderCommandFactory(input));
+        ch.regCommand("c", new CancelOrderCommandFactory(input));
+        ch.regCommand("l", new ListOrdersCommandFactory());
+        ch.regCommand("d", new OrderIsDoneCommandFactory());
+        ch.regCommand("q", new ExitCommandFactory());
+        return ch;
+    }
+}

_resources/it114105/itp4507/Assignment/20-21/src/Order.java

@@ -0,0 +1,35 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+public abstract class Order {
+    private String staffNumber;
+    private String officeLocation;
+
+    public Order(String staffNumber, String officeLocation) {
+        this.staffNumber = staffNumber;
+        this.officeLocation = officeLocation;
+    }
+
+    public String getStaffNumber() {
+        return staffNumber;
+    }
+
+    public String getOfficeLocation() {
+        return officeLocation;
+    }
+
+    
+    public String toSting(){
+        return getStaffNumber() + ", " + getOfficeLocation() + ", ";
+    }
+    
+    public abstract String getOrderDetail();
+     
+}

_resources/it114105/itp4507/Assignment/20-21/src/OrderChineseLunchSet.java

@@ -0,0 +1,25 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class OrderChineseLunchSet extends Order {
+    
+    private String drinkCode;
+    private LunchSet lunchset;
+    
+    public OrderChineseLunchSet(String drinkCode, String staffNumber, String officeLocation, LunchSet lunchSet) {
+        super(staffNumber, officeLocation);
+        this.lunchset = lunchSet;
+        this.drinkCode = drinkCode;
+    }
+    
+    public String getOrderDetail(){
+        return "C: " + super.toSting() + lunchset.getMainDish() + ", Chinese Soup, " + ChineseStyleLunchSet.getDrink(drinkCode);
+    }
+}

_resources/it114105/itp4507/Assignment/20-21/src/OrderWesternLunchSet.java

@@ -0,0 +1,32 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author jerrykwok
+ */
+public class OrderWesternLunchSet extends Order{
+    private String sideCode;
+    private String drinkCode;
+    private LunchSet lunchSet;
+
+    public OrderWesternLunchSet(String drinkCode, String sideCode, String staffNumber, String officeLocation, LunchSet lunchSet) {
+        super(staffNumber, officeLocation);
+        this.sideCode = sideCode;
+        this.drinkCode = drinkCode;
+        this.lunchSet = lunchSet;
+    }
+
+   
+    public String getSideCode(){
+        return sideCode;
+    }
+    
+    public String getOrderDetail(){
+        return "W: " + super.toSting() + lunchSet.getMainDish()+ ", " + WesternStyleLunchSet.getSide(sideCode)  +  ", Wetern Soup, " + WesternStyleLunchSet.getDrink(drinkCode);
+    }
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/RecordCommand.java

@@ -0,0 +1,22 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+import java.util.ArrayList;
+import java.util.Stack;
+import java.util.List;
+
+public abstract class RecordCommand implements Command{
+   
+    public RecordCommand(){
+        
+    }
+    
+    
+}

_resources/it114105/itp4507/Assignment/20-21/src/StaffCanteen.java

@@ -0,0 +1,119 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+
+public class StaffCanteen {
+
+    private static HashMap<String, LunchSet> menuList;
+    private static ArrayList<Order> orderList;
+    private static StaffCanteen instance = new StaffCanteen();
+    private static Caretaker caretaker;
+
+    private StaffCanteen() {
+        menuList = new HashMap<>();
+        orderList = new ArrayList<>();
+        caretaker = new Caretaker();
+    }
+
+    public static StaffCanteen getInstance() {
+        return instance;
+    }
+
+    public int searchMenuAvaiable(String menuCode) {
+        return menuList.get(menuCode).getAvailableCount();
+    }
+
+    public LunchSet editMenu(String styleMenu, String mainDish, int price, int availabe) throws LunchSetStyleException {
+        LunchSet lunchSet = null;
+
+        switch (styleMenu) {
+            case "c":
+                lunchSet = new ChineseStyleLunchSet(mainDish, price, availabe);
+                break;
+            case "w":
+                lunchSet = new WesternStyleLunchSet(mainDish, price, availabe);
+                break;
+            default:
+                throw new LunchSetStyleException();
+        }
+
+        menuList.put(styleMenu, lunchSet);
+        return lunchSet;
+    }
+
+    public void printMenu() {
+        menuList.keySet().forEach((menuKey) -> {
+            System.out.println();
+            System.out.println(menuList.get(menuKey).getDetails());
+        });
+    }
+
+    public Order placeChineseLunchSetOrder(String drinkCode, String staffNumber, String officeLocation) {
+        LunchSet chineseLunchset = menuList.get("c");
+        OrderChineseLunchSet chineseLunchSetOrder = new OrderChineseLunchSet(drinkCode, staffNumber, officeLocation, chineseLunchset);
+        orderList.add(chineseLunchSetOrder);
+        saveLunchSet(chineseLunchset);
+        chineseLunchset.reduceOneAvailableCount();
+        return chineseLunchSetOrder;
+    }
+
+    public Order placeWesternLunchSetOrder(String drinkCode, String sideCode, String staffNumber, String officeLocation) {
+        LunchSet westernLunchset = menuList.get("w");
+        OrderWesternLunchSet westernLunchSetOrder = new OrderWesternLunchSet(drinkCode, sideCode, staffNumber, officeLocation, westernLunchset);
+        orderList.add(westernLunchSetOrder);
+        saveLunchSet(westernLunchset);
+        westernLunchset.reduceOneAvailableCount();
+        return westernLunchSetOrder;
+    }
+
+    private void saveLunchSet(LunchSet lunchSet) {
+        caretaker.saveLunchSet(lunchSet.saveMemento());
+    }
+
+    public void listOrder() {
+        System.out.println();
+        System.out.println("Outstanding Orders");
+        orderList.forEach((order) -> {
+            System.out.println(order.getOrderDetail());
+        });
+    }
+
+    public Order orderDone() {
+        if (orderList.isEmpty()) {
+            System.out.println("No Order");
+            return null;
+        }
+
+        Order order = orderList.remove(0);
+        System.out.println("\nComplete Order");
+        System.out.println(order.getOrderDetail());
+        System.out.println("Order marked as done");
+        return order;
+    }
+
+    public void cancelOrder(String staffNumber) {
+        Order removeOrder = null;
+        Iterator<Order> i = orderList.iterator();
+        while (i.hasNext()) {
+            Order order = i.next();
+            if (order.getStaffNumber().equals(staffNumber)) {
+                removeOrder = order;
+                i.remove();
+            }
+        }
+        System.out.println(removeOrder.getOrderDetail().substring(3));
+        caretaker.undo();
+        System.out.println("Order Cancelled");
+    }
+
+}

_resources/it114105/itp4507/Assignment/20-21/src/WesternStyleLunchSet.java

@@ -0,0 +1,58 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+public class WesternStyleLunchSet extends LunchSet {
+
+    public WesternStyleLunchSet(String mainDish, int price, int availableCount) {
+        super(mainDish, price, availableCount);
+    }
+
+    public String getSideDish() {
+        return "rice/spaghetti/French fries";
+    }
+
+    public static String getDrink(String drinkCode) {
+        String drink = "";
+        if (drinkCode.charAt(0) == 'i') {
+            drink = "Iced ";
+        } else {
+            drink = "Hot ";
+        }
+        if (drinkCode.charAt(1) == 't') {
+            drink += "Tea";
+        } else {
+            drink += "Coffee";
+        }
+        return drink;
+    }
+
+    public static String getSide(String sideCode) {
+        if (sideCode.equals("r")) {
+            return "rice";
+        } else if (sideCode.equals("s")) {
+            return "spaghetti";
+        } else {
+            return "French fries";
+        }
+    }
+
+    public String getDetails() {
+        return "Western style Business Set Lunch\n"
+                + "main dish: " + super.getMainDish() + "\n"
+                + "with " + getSideDish() + "\n"
+                + "price: " + super.getPrice() + "\n"
+                + "available count: " + super.getAvailableCount();
+    }
+
+    @Override
+    public LunchSetWesternStyleMemento saveMemento() {
+        return new LunchSetWesternStyleMemento(this);
+    }
+}