final project q11

2022-05-24 23:51:13 +08:00
parent 621b5c355d
commit 252d0c67bb
21 changed files with 783 additions and 0 deletions
--- a/finalproject/Question11/Library.java
+++ b/finalproject/Question11/Library.java
@@ -0,0 +1,122 @@
+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-04-25
+ * Description: This is the Library class.
+ */
+
+import java.util.ArrayList;
+
+public class Library {
+	private String name;
+	private ArrayList<IUser> users;
+	private ArrayList<ModelListener> listeners;
+
+	/**
+	 * Constructor.
+	 *
+	 * @param name
+	 */
+	public Library(String name) {
+		this.name = name;
+
+		// init array list
+		this.users = new ArrayList<IUser>();
+		this.listeners = new ArrayList<ModelListener>();
+	}
+
+	// GUI Related
+	public void addListener(ModelListener listener) {
+		listeners.add(listener);
+	}
+
+	// GUI Related
+	private void notifyListeners() {
+		for (ModelListener listener : listeners) {
+			listener.update();
+		}
+	}
+
+	/**
+	 * Add the user to the array list.
+	 *
+	 * @param user The user to be added
+	 */
+	public void addUser(IUser user) {
+		users.add(user);
+		notifyListeners();
+	}
+
+	/**
+	 * The total number of bookds borrowed by all users.
+	 *
+	 * @return the number of books.
+	 */
+	public int totalBorrowedBooks() {
+		int total = 0;
+		for (IUser user : users) {
+			total += user.getBook();
+		}
+		return total;
+	}
+
+	/**
+	 * Get the number of books borrowed by this user.
+	 *
+	 * @param name the name of the query user
+	 * @return the number of books
+	 * @throws UnknownUserException if user not found
+	 */
+	public int getBook(String name) throws UnknownUserException {
+		for (IUser user : users) {
+			if (user.getName().equals(name)) {
+				return user.getBook();
+			}
+		}
+		// user not found
+		throw new UnknownUserException("User " + name + " unknown.");
+	}
+
+	/**
+	 * Change the number of books currently borrowed by that user.
+	 *
+	 * @param name   the user's name
+	 * @param number the number of books
+	 * @throws UnknownUserException user not found
+	 * @throws NotALenderException  can not lend book
+	 */
+	public void moreBook(String name, int number) throws UnknownUserException, NotALenderException {
+		for (IUser user : users) {
+			if (user.getName().equals(name)) {
+				user.moreBook(number);
+				notifyListeners();
+				return;
+			}
+		}
+		// user not found
+		throw new UnknownUserException("User " + name + " unknown.");
+	}
+
+	/**
+	 * Test.
+	 */
+	public static void testLibrary() {
+		Library li = new Library("UIC Library");
+		System.out.println(li.totalBorrowedBooks() == 0);
+		li.addUser(new Lender("L1", 10));
+		try {
+			System.out.println(li.getBook("L1") == -10);
+			System.out.println(li.totalBorrowedBooks() == -10);
+			li.addUser(new Borrower("B1", 20));
+			System.out.println(li.getBook("L1") == -10);
+			System.out.println(li.getBook("B1") == 20);
+			System.out.println(li.totalBorrowedBooks() == 10);
+			li.getBook("B2");
+		} catch (UnknownUserException ex) {
+			System.out.println(ex.getMessage().equals("User B2 unknown."));
+		} catch (NotALenderException ex) {
+			// This should never happen!
+			System.out.println(false);
+		}
+		// More test cases are needed
+	}
+}