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feat: adds Sherllin's library management system with tests (#259)
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‎lesson_09/oop/oop_app/src/main/java/com/codedifferently/lesson9/sherllin/Book.java

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package com.codedifferently.lesson9.sherllin;
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// We want to define a book and keep track of its title, isbn, author(s), number of pages, and
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// whether it is checked out or not.
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// We want define a patron with properties including their name and the books they have checked out.
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// We want to define a library that:
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// Allows us to add/remove a book to and from its collection of books.
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// Allows us to register new patrons
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// Allows us to check out books to patrons.
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// Allows us to return books from patrons.
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public class Book {
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private String bookTitle;
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private long isbn;
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private String author;
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private int pages;
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private boolean checkedOut;
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public Book(String bookTitle, long isbn, String author, int pages, boolean checkedOut) {
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this.bookTitle = bookTitle;
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this.isbn = isbn;
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this.author = author;
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this.pages = pages;
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this.checkedOut = checkedOut;
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}
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public String getBookTitle() {
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return bookTitle;
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}
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public long getIsbn() {
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return isbn;
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}
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public String getAuthor() {
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return author;
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}
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public int getPages() {
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return pages;
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}
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public boolean checkedOut() {
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return checkedOut;
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}
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}

‎lesson_09/oop/oop_app/src/main/java/com/codedifferently/lesson9/sherllin/Library.java

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package com.codedifferently.lesson9.sherllin;
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import java.util.HashMap;
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import java.util.Map;
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// We want to define a library that:
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// Allows us to add/remove a book to and from its collection of books.
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// Allows us to register new patrons
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// Allows us to check out books to patrons.
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public class Library {
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private Map<Long, Boolean> bookStatus; // Used ISBN as the key for book status
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private Map<String, Integer> patronBooks; // Used name as key for patron's checked-out books count
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public Library() {
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this.bookStatus = new HashMap<>();
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this.patronBooks = new HashMap<>();
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}
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public void addBook(long isbn) {
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bookStatus.put(isbn, false); // Book is not checked out
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}
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public void removeBook(long isbn) {
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bookStatus.remove(isbn);
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}
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public void registerPatron(String patronName) {
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patronBooks.put(patronName, 0); // Patron has no books checked out
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}
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public void checkoutOrReturnBook(long isbn, String patronName, boolean checkOut) {
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Boolean isBookCheckedOut = bookStatus.get(isbn);
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Integer checkedOutBooksCount = patronBooks.getOrDefault(patronName, 0);
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if (isBookCheckedOut == null || checkedOutBooksCount == null) {
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System.out.println("Book or patron not found");
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return;
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}
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if (checkOut) {
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if (!isBookCheckedOut) {
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bookStatus.put(isbn, true);
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patronBooks.put(patronName, checkedOutBooksCount + 1);
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System.out.println("Book checked out to " + patronName);
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} else {
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System.out.println("Sorry! Book already checked out");
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}
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} else {
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if (isBookCheckedOut && checkedOutBooksCount > 0) {
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bookStatus.put(isbn, false);
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patronBooks.put(patronName, checkedOutBooksCount - 1);
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System.out.println("Book returned by " + patronName);
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} else {
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System.out.println("Book not checked out or invalid return operation");
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}
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}
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}
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public Map<Long, Boolean> getBookStatus() {
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return bookStatus;
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}
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public Map<String, Integer> getPatronBooks() {
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return patronBooks;
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}
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}

‎lesson_09/oop/oop_app/src/main/java/com/codedifferently/lesson9/sherllin/Patron.java

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package com.codedifferently.lesson9.sherllin;
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public class Patron {
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private String name;
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private int bookCheckedOut;
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public Patron(String name, int bookCheckedOut) {
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this.name = name;
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this.bookCheckedOut = bookCheckedOut;
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}
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public String getName() {
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return name;
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}
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public int getBookCheckedOut() {
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return bookCheckedOut;
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}
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}

‎lesson_09/oop/oop_app/src/test/java/com/codedifferently/lesson9/sherllin/BookTest.java

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package com.codedifferently.lesson9.sherllin;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import java.util.HashMap;
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import java.util.Map;
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import org.junit.jupiter.api.Test;
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// We want to define a book and keep track of its title, isbn, author(s), number of pages, and
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// whether it is checked out or not.
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// We want define a patron with properties including their name and the books they have checked out.
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// We want to define a library that:
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// Allows us to add/remove a book to and from its collection of books.
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// Allows us to register new patrons
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// Allows us to check out books to patrons.
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// Allows us to return books from patrons.
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public class BookTest {
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@Test
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public void testBookProperties() {
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// Arrange
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String title = "The Alchemist";
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long isbn = 9780061122415L;
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String author = "Paulo Coelho";
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int pages = 208;
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boolean checkedOut = false;
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// Act
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Book theAlchemist = new Book(title, isbn, author, pages, checkedOut);
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// Assert
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assertEquals(title, theAlchemist.getBookTitle());
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assertEquals(isbn, theAlchemist.getIsbn());
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assertEquals(author, theAlchemist.getAuthor());
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assertEquals(pages, theAlchemist.getPages());
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assertEquals(checkedOut, theAlchemist.checkedOut());
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// Test additional books
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Book theCatInTheHat = new Book(title, isbn, author, pages, checkedOut);
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assertEquals(title, theCatInTheHat.getBookTitle());
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assertEquals(isbn, theCatInTheHat.getIsbn());
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assertEquals(author, theCatInTheHat.getAuthor());
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assertEquals(pages, theCatInTheHat.getPages());
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assertEquals(checkedOut, theCatInTheHat.checkedOut());
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Book atomicHabits = new Book(title, isbn, author, pages, checkedOut);
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assertEquals(title, atomicHabits.getBookTitle());
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assertEquals(isbn, atomicHabits.getIsbn());
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assertEquals(author, atomicHabits.getAuthor());
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assertEquals(pages, atomicHabits.getPages());
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assertEquals(checkedOut, atomicHabits.checkedOut());
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}
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@Test
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public void testPatronProperties() {
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Patron patron = new Patron("Nathalie", 3);
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String name = "Nathalie";
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int bookCheckedOut = 3;
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assertEquals(name, patron.getName());
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assertEquals(bookCheckedOut, patron.getBookCheckedOut());
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}
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@Test
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public void testAddBook() {
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Library library = new Library();
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library.addBook(9780316769488L);
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library.addBook(9780142437209L);
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library.addBook(9780743273565L);
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assertEquals(3, library.getBookStatus().size());
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assertEquals(Boolean.FALSE, library.getBookStatus().get(9780316769488L));
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assertEquals(Boolean.FALSE, library.getBookStatus().get(9780142437209L));
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assertEquals(Boolean.FALSE, library.getBookStatus().get(9780743273565L));
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}
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@Test
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public void testRemoveBook() {
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Library library = new Library();
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library.addBook(9780316769488L);
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library.addBook(9780142437209L);
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library.removeBook(9780316769488L);
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Map<Long, Boolean> expectedBookStatus = new HashMap<>();
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expectedBookStatus.put(9780142437209L, false);
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assertEquals(expectedBookStatus, library.getBookStatus());
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}
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@Test
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public void testRegisterPatron() {
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Library library = new Library();
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library.registerPatron("Lily");
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library.registerPatron("Dali");
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assertEquals(2, library.getPatronBooks().size());
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assertEquals(Integer.valueOf(0), library.getPatronBooks().get("Lily"));
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assertEquals(Integer.valueOf(0), library.getPatronBooks().get("Dali"));
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}
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@Test
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public void testCheckoutAndReturnBook() {
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Library library = new Library();
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library.addBook(9780316769488L);
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library.registerPatron("Lily");
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library.registerPatron("Dali");
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library.checkoutOrReturnBook(9780316769488L, "Lily", true);
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library.checkoutOrReturnBook(9780316769488L, "Dali", true);
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library.checkoutOrReturnBook(9780316769488L, "Dali", true);
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assertEquals(Boolean.TRUE, library.getBookStatus().get(9780316769488L));
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assertEquals(Integer.valueOf(1), library.getPatronBooks().get("Lily"));
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assertEquals(Integer.valueOf(0), library.getPatronBooks().get("Dali"));
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library.checkoutOrReturnBook(9780316769488L, "Dali", false);
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library.checkoutOrReturnBook(9780316769488L, "Lily", false);
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assertEquals(Boolean.FALSE, library.getBookStatus().get(9780316769488L));
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assertEquals(Integer.valueOf(0), library.getPatronBooks().get("Lily"));
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assertEquals(Integer.valueOf(0), library.getPatronBooks().get("Dali"));
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}
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}

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