40230112123

.gitignore

@@ -0,0 +1,10 @@
+/.library.txt
+/out/production/Library-Management-System/Admin.class
+/out/production/Library-Management-System/Book.class
+/out/production/Library-Management-System/Library.class
+/out/production/Library-Management-System/Manual.class
+/out/production/Library-Management-System/MyApp.class
+/out/production/Library-Management-System/NormalUser.class
+/out/production/Library-Management-System/Rent.class
+/out/production/Library-Management-System/User.class
+/out/production/Library-Management-System/Updatable.class

Answers/src/Admin.java

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+
+public class Admin extends User {
+    private final String password;
+
+    public Admin(String name, String phoneNumber, String password) throws IllegalArgumentException {
+        super(name, phoneNumber);
+
+        // validate password
+        if (!password.matches(".*\\d.*") && !password.matches(".*[a-z].*") &&
+                !password.matches(".*[A-Z].*") && !password.matches("[^(\"\\s)]*"))
+            throw new IllegalArgumentException("Password should contain at least one digit," +
+                    "one capital and small letter\nand should not have \" character and white spaces.");
+
+        this.password = password;
+    }
+
+    // to verify the password
+    public boolean verify(String password) {
+        return this.password.equals(password);
+    }
+}

Answers/src/Book.java

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+import java.sql.*;
+
+public class Book implements Updatable {
+    private String title;
+    private String author;
+    private String description;
+    private int uniqueID; // unique id automatically generate in database
+    private boolean availabilityStatus = true;
+
+    // two arguments constructor
+    public Book(String title, String author) {
+        this.title = title;
+        this.author = author;
+    }
+
+    // three arguments constructor
+    public Book(String title, String author, String description) {
+        this.title = title;
+        this.author = author;
+        this.description = description;
+    }
+
+    public Book(int bookID) throws Exception {
+        final String SQL_COMMAND = "SELECT * FROM books WHERE BookID = ?;";
+
+        try (Connection connection = DriverManager.getConnection(MyApp.DB_URL, MyApp.DB_USERNAME,
+                MyApp.DB_PASSWORD);
+             PreparedStatement selectBook = connection.prepareStatement(SQL_COMMAND)){
+
+            selectBook.setInt(1, bookID);
+
+            ResultSet resultSet = selectBook.executeQuery();
+
+            if (resultSet.next()) {
+                this.uniqueID = bookID;
+                this.title = resultSet.getString("Title");
+                this.author = resultSet.getString("Author");
+                this.description = resultSet.getString("Description");
+                this.availabilityStatus = resultSet.getBoolean("AvailabilityStatus");
+            } else
+                throw new Exception("Book with ID = " + bookID + " not found.");
+        } catch (SQLException e) {
+            e.printStackTrace();
+            System.err.print("Connection to database failed! Terminating...");
+            System.exit(1);
+        }
+    }
+
+    @Override
+    public void update() {
+        final String SQL_COMMAND = "SELECT BookID, AvailabilityStatus FROM books WHERE Title = ? " +
+                "AND Author = ?";
+
+        try (Connection connection = DriverManager.getConnection(MyApp.DB_URL,
+                MyApp.DB_USERNAME, MyApp.DB_PASSWORD);
+             PreparedStatement selectID = connection.prepareStatement(SQL_COMMAND)) {
+
+            selectID.setString(1, this.title);
+            selectID.setString(2, this.author);
+
+            ResultSet resultSet = selectID.executeQuery();
+            if (resultSet.next()) {
+                this.uniqueID = resultSet.getInt("BookID");
+                this.availabilityStatus = resultSet.getBoolean("AvailabilityStatus");
+            }
+        } catch (SQLException sqlException) {
+            sqlException.printStackTrace();
+            System.err.print("Connection to database failed! Terminating...");
+            System.exit(1);
+        }
+    }
+
+    public void setStatus(boolean availabilityStatus) {
+        final String SQL_COMMAND = "UPDATE books SET AvailabilityStatus = ? WHERE BookID = ?;";
+
+        try (Connection connection = DriverManager.getConnection(MyApp.DB_URL, MyApp.DB_USERNAME,
+                MyApp.DB_PASSWORD);
+             PreparedStatement changeStatusCommand = connection.prepareStatement(SQL_COMMAND)){
+
+            changeStatusCommand.setBoolean(1, availabilityStatus);
+            changeStatusCommand.setInt(2, this.uniqueID);
+            changeStatusCommand.executeUpdate();
+
+            this.availabilityStatus = availabilityStatus;
+        } catch (SQLException e) {
+            e.printStackTrace();
+            System.err.print("Connection to database failed! Terminating...");
+        }
+    }
+    public String getTitle() {
+        return title;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public int getUniqueID() {
+        return uniqueID;
+    }
+}