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feat: created 'Bookshelf' class (#516)
* feat: created 'Bookshelf' class for Chelsea * chore: './gradlew :objects_app:spotlessApply' script * chore: created new folder 'Bookshelf' for class * chore: fixed capitalization
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‎lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/chelseaogbonnia/Bookshelf/Book.java

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package com.codedifferently.lesson16.chelseaogbonnia.bookshelf;
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enum Genre {
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FICTION,
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NON_FICTION,
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MYSTERY,
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SCIENCE_FICTION,
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FANTASY,
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HORROR,
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ROMANCE,
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ADVENTURE,
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HISTORY,
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CRIME
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}
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enum BookType {
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HARDCOVER,
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PAPERBACK,
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MAGAZINE,
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NOVEL,
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POEM,
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COMICS
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}
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public class Book {
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private String title;
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private String author;
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private Genre genre;
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private BookType bookType;
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public Book(String title, String author, Genre genre, BookType bookType) {
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this.title = title;
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this.author = author;
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this.genre = genre;
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this.bookType = bookType;
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}
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public String getTitle() {
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return title;
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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 Genre getGenre() {
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return genre;
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}
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public BookType getBookType() {
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return bookType;
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}
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}

‎lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/chelseaogbonnia/Bookshelf/Bookshelf.java

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package com.codedifferently.lesson16.chelseaogbonnia.bookshelf;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.List;
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class BookNotFoundException extends Exception {
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public BookNotFoundException(String message) {
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super(message);
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}
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}
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public class Bookshelf {
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private String owner;
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private int capacity;
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private List<Book> books;
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private HashMap<String, Book> bookMap;
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private boolean isPublic;
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public Bookshelf(String owner, int capacity, boolean isPublic) {
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this.owner = owner;
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this.capacity = capacity;
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this.isPublic = isPublic;
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this.books = new ArrayList<>();
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this.bookMap = new HashMap<>();
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}
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public List<Book> listBooks() {
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return Collections.unmodifiableList(books);
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}
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public void addBook(Book book) throws Exception {
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if (books.size() >= capacity) {
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throw new Exception("Bookshelf is full. Cannot add more books.");
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}
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books.add(book);
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bookMap.put(book.getTitle(), book);
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}
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public Book findBook(String title) throws BookNotFoundException {
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if (bookMap.containsKey(title)) {
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return bookMap.get(title);
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}
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throw new BookNotFoundException("Book titled \"" + title + "\" not found.");
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}
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public boolean hasBook(String title) {
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return bookMap.containsKey(title);
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}
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public int countBooksByGenre(Genre genre) {
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int count = 0;
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for (Book book : books) {
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if (book.getGenre() == genre) {
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count++;
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}
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}
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return count;
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}
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public String getOwner() {
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return owner;
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}
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public boolean isPublic() {
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return isPublic;
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}
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@Override
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public String toString() {
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return "Bookshelf owned by "
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+ owner
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+ " with capacity "
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+ capacity
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+ " (Public: "
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+ isPublic
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+ ")";
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}
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}

‎lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/chelseaogbonnia/Bookshelf/BookshelfTest.java

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package com.codedifferently.lesson16.chelseaogbonnia.bookshelf;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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public class BookshelfTest {
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private Bookshelf bookshelf;
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@BeforeEach
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public void setUp() {
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bookshelf = new Bookshelf("Chelsea", 10, true);
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}
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@Test
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public void testAddBook() throws Exception {
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// Arrange
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Book book = new Book("Frankenstein", "Mary Shelly", Genre.HORROR, BookType.NOVEL);
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// Act
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bookshelf.addBook(book);
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// Assert
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assertTrue(bookshelf.hasBook("Frankenstein"));
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}
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@Test
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public void testFindBookExists() throws Exception {
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// Arrange
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Book book =
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new Book("Brave New World", "Aldous Huxley", Genre.SCIENCE_FICTION, BookType.PAPERBACK);
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bookshelf.addBook(book);
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// Act
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Book foundBook = bookshelf.findBook("Brave New World");
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// Assert
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assertEquals(book, foundBook);
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}
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@Test
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public void testFindBookNotExists() {
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// Arrange
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String nonExistentBookTitle = "Non-Existent Book";
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// Act & Assert
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Exception exception =
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assertThrows(
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BookNotFoundException.class,
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() -> {
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bookshelf.findBook(nonExistentBookTitle);
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});
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assertEquals("Book titled \"" + nonExistentBookTitle + "\" not found.", exception.getMessage());
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}
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@Test
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public void testCountBooksByGenre() throws Exception {
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// Arrange
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bookshelf.addBook(new Book("The Hobbit", "J.R.R. Tolkien", Genre.FANTASY, BookType.HARDCOVER));
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bookshelf.addBook(new Book("Dune", "Frank Herbert", Genre.SCIENCE_FICTION, BookType.HARDCOVER));
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// Act & Assert
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assertEquals(1, bookshelf.countBooksByGenre(Genre.SCIENCE_FICTION));
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assertEquals(1, bookshelf.countBooksByGenre(Genre.FANTASY));
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}
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@Test
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public void testAddBookToFullShelf() throws Exception {
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// Arrange
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for (int i = 0; i < 10; i++) {
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bookshelf.addBook(new Book("Book " + i, "Author " + i, Genre.FICTION, BookType.PAPERBACK));
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}
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Book extraBook = new Book("Extra Book", "Author Extra", Genre.FICTION, BookType.HARDCOVER);
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// Act & Assert
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Exception exception =
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assertThrows(
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Exception.class,
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() -> {
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bookshelf.addBook(extraBook);
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});
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assertEquals("Bookshelf is full. Cannot add more books.", exception.getMessage());
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}
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@Test
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public void testCountBooksByGenreNoBooks() {
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// Arrange
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Genre genreToCheck = Genre.ADVENTURE;
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// Act & Assert
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assertEquals(0, bookshelf.countBooksByGenre(genreToCheck));
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}
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@Test
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public void testListBooks() throws Exception {
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// Arrange
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bookshelf.addBook(
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new Book("The Adventures of Tintin", "Hergé", Genre.ADVENTURE, BookType.COMICS));
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bookshelf.addBook(new Book("The Big Sleep", "Raymond Chandler", Genre.CRIME, BookType.NOVEL));
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bookshelf.addBook(
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new Book("Don Quixote", "Miguel de Cervantes", Genre.ADVENTURE, BookType.NOVEL));
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bookshelf.addBook(new Book("Sonnet 18", "William Shakespeare", Genre.ROMANCE, BookType.POEM));
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// Act
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int bookCount = bookshelf.listBooks().size();
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// Assert
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assertEquals(4, bookCount);
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}
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@Test
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public void checksMagazineBooks() throws Exception {
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// Arrange
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Book magazine =
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new Book("National Geographic", "Various", Genre.NON_FICTION, BookType.MAGAZINE);
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bookshelf.addBook(magazine);
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// Act
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boolean hasMagazine = bookshelf.hasBook("National Geographic");
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int magazineCount = bookshelf.countBooksByGenre(Genre.NON_FICTION);
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// Assert
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assertTrue(hasMagazine, "Bookshelf should contain the magazine 'National Geographic'.");
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assertEquals(
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1, magazineCount, "There should be 1 magazine in the bookshelf under NON_FICTION.");
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}
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}

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