Restore

Labs/Lab13/Question3/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

Labs/Lab13/Question3/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question3</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Labs/Lab13/Question3/.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding/<project>=UTF-8

Labs/Lab13/Question3/src/Controller.java

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+public class Controller {
+	protected Model m;
+	
+	public Controller(Model m) {
+		this.m = m;
+	}
+	
+	protected void shutdown() {
+		m.saveData();
+		System.exit(0);
+	}
+}

Labs/Lab13/Question3/src/ControllerClicks.java

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+import java.awt.Point;
+
+public class ControllerClicks extends Controller {
+	public ControllerClicks(Model m) {
+		super(m);
+	}
+	public void mouseClicked(Point p) {
+		m.addPoint(p);
+	}
+	public void resetClicked() {
+		m.clearAllPoints();
+	}
+	public void undoClicked() {
+		m.deleteLastPoint();
+	}
+}

Labs/Lab13/Question3/src/Model.java

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+import java.awt.Point;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+
+public class Model {
+    private ArrayList<Point> points;
+    private ArrayList<ModelListener> listeners;
+    private Connection connection;
+
+    public Model() {
+        points = new ArrayList<Point>();
+        listeners = new ArrayList<ModelListener>();
+
+        try {
+            // Establish a connection to the MySQL database
+            connection = DriverManager.getConnection("jdbc:Mysql://localhost/java", "root", "");
+
+            // Delete all existing point coordinates from the 'points' table
+            String deleteQuery = "DELETE FROM points";
+            Statement deleteStatement = connection.createStatement();
+            deleteStatement.executeUpdate(deleteQuery);
+
+            // Fetch all point coordinates from the 'points' table
+            String selectQuery = "SELECT x, y FROM points";
+            Statement selectStatement = connection.createStatement();
+            ResultSet resultSet = selectStatement.executeQuery(selectQuery);
+
+            // Add the fetched coordinates to the 'points' list
+            while (resultSet.next()) {
+                int x = resultSet.getInt("x");
+                int y = resultSet.getInt("y");
+                points.add(new Point(x, y));
+            }
+        } catch (SQLException e) {
+            System.err.println(e.getMessage());
+            System.exit(1);
+        }
+    }
+
+    public void addListener(ModelListener l) {
+        listeners.add(l);
+    }
+
+    public ArrayList<Point> getPoints() {
+        return points;
+    }
+
+    public void addPoint(Point p) {
+        points.add(p);
+        notifyListeners();
+    }
+
+    public void clearAllPoints() {
+        points.clear();
+        notifyListeners();
+    }
+
+    public void deleteLastPoint() {
+        if (points.size() > 0) {
+            points.remove(points.size() - 1);
+            notifyListeners();
+        }
+    }
+
+    public void saveData() {
+        try {
+            // Delete all existing point coordinates from the 'points' table
+            String deleteQuery = "DELETE FROM points";
+            Statement deleteStatement = connection.createStatement();
+            deleteStatement.executeUpdate(deleteQuery);
+
+            // Insert the updated point coordinates into the 'points' table
+            String insertQuery = "INSERT INTO points (x, y) VALUES (?, ?)";
+            PreparedStatement insertStatement = connection.prepareStatement(insertQuery);
+            for (Point p : points) {
+                insertStatement.setInt(1, p.x);
+                insertStatement.setInt(2, p.y);
+                insertStatement.executeUpdate();
+            }
+        } catch (SQLException e) {
+            System.err.println(e.getMessage());
+            System.exit(1);
+        }
+        notifyListeners();
+    }
+
+    public int numberOfPoints() {
+        return points.size();
+    }
+
+    private void notifyListeners() {
+        for (ModelListener l : listeners) {
+            l.update();
+        }
+    }
+
+    public static void testModel() {
+		Model m = new Model();
+		m.addListener(new ModelListener() {
+			@Override
+				public void update() {
+			System.out.println(true + " (listener)");
+			}
+		});
+		System.out.println(m.getPoints() == m.points);
+		Point p1 = new Point(1, 2);
+		Point p2 = new Point(3, 4);
+		m.addPoint(p1); // Listener called.
+		m.addPoint(p2); // Listener called.
+		System.out.println(m.numberOfPoints() == 2);
+		System.out.println(m.points.get(0) == p1);
+		System.out.println(m.points.get(1) == p2);
+		m.deleteLastPoint(); // Listener called.
+		System.out.println(m.numberOfPoints() == 1);
+		System.out.println(m.points.get(0) == p1);
+		m.clearAllPoints(); // Listener called.
+		System.out.println(m.numberOfPoints() == 0);
+		m.notifyListeners(); // Listener called.
+	}
+    
+}

Labs/Lab13/Question3/src/ModelListener.java

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+
+public interface ModelListener {
+	public void update();
+}

Labs/Lab13/Question3/src/MyFrame.java

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+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+import javax.swing.JPanel;
+
+public class MyFrame extends View<ControllerClicks> {
+	public MyFrame(Model m, ControllerClicks c) {
+	super(m, c);
+	this.setTitle("MyFrame Title");
+	this.setSize(400, 300);
+	this.setLocationRelativeTo(null);
+	this.setLayout(new BorderLayout());
+	MyPanel centerPanel = new MyPanel(m, c);
+	this.add(centerPanel, BorderLayout.CENTER);
+	JPanel topPanel = new JPanel();
+	this.add(topPanel, BorderLayout.PAGE_START);
+	topPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
+	JButton resetButton = new JButton("Reset");
+	resetButton.addActionListener(new ActionListener() {
+		@Override
+		public void actionPerformed(ActionEvent e) {
+			c.resetClicked();
+		}
+	});
+	topPanel.add(resetButton);
+	JButton undoButton = new JButton("Undo");
+	undoButton.addActionListener(new ActionListener() {
+		@Override
+		public void actionPerformed(ActionEvent e) {
+			c.undoClicked();
+		}
+	});
+	topPanel.add(undoButton);
+	this.setVisible(true);
+	}
+	
+	@Override
+	public void update() {
+		repaint(); // Makes Swing call MyPanel's paintComponent method.
+	}
+}

Labs/Lab13/Question3/src/MyPanel.java

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+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Point;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.ArrayList;
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+	private Model m;
+	private ControllerClicks c;
+	public MyPanel(Model m, ControllerClicks c) {
+		this.m = m;
+		this.c = c;
+		this.addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				if(e.getButton() == MouseEvent.BUTTON1) {
+					c.mouseClicked(e.getPoint());
+				}
+			}
+		});
+	}
+	@Override
+	protected void paintComponent(Graphics g) {
+		super.paintComponent(g);
+		ArrayList<Point> points = m.getPoints();
+		g.setColor(Color.RED);
+		if(points.size() == 1) {
+			Point p = points.get(0);
+			g.drawRect((int)p.getX(), (int)p.getY(), 1, 1);
+		}
+		else {
+			for(int i = 1; i < points.size(); i++) {
+			Point start = points.get(i - 1);
+			Point end = points.get(i);
+			g.drawLine((int)start.getX(), (int)start.getY(),
+			(int)end.getX(), (int)end.getY());
+			}
+		}
+	}
+}

Labs/Lab13/Question3/src/Start.java

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+public class Start {
+	public static void main(String[] args) {
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				Model m = new Model();
+				ControllerClicks c1 = new ControllerClicks(m);
+				MyFrame v1 = new MyFrame(m, c1);
+				Controller c2 = new Controller(m);
+				ViewNumber v2 = new ViewNumber(m, c2);
+			}
+		});
+	}
+}

Labs/Lab13/Question3/src/Test.java

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+public class Test {
+	public static void main(String[] args) {
+		Model.testModel();
+	}
+}

Labs/Lab13/Question3/src/View.java

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+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+
+import javax.swing.JFrame;
+
+public abstract class View<T extends Controller> extends JFrame implements ModelListener 
+{
+	protected Model m;
+	protected T c;
+	
+	public View(Model m, T c) {
+		this.m = m;
+		this.c = c;
+		m.addListener(this);
+		this.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
+		this.addWindowListener(new WindowAdapter() {
+			@Override
+			public void windowClosing(WindowEvent e) {
+				c.shutdown(); // Controller decides meaning.
+			}
+		});
+	}
+	
+	@Override
+	public abstract void update();
+}

Labs/Lab13/Question3/src/ViewNumber.java

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+import javax.swing.JLabel;
+
+public class ViewNumber extends View<Controller> {
+	private JLabel label;
+	public ViewNumber(Model m, Controller c) {
+		super(m, c);
+		this.setTitle("View Number");
+		this.setSize(150, 150);
+		label = new JLabel();
+		update(); // Initialize the label using the model.
+		this.add(label);
+		this.setVisible(true);
+	}
+	
+	@Override
+	public void update() {
+		label.setText("Number of points is: " + m.numberOfPoints());
+	}
+}