feat: adds Aaron's LibraryLog ,Book, and Guest with test blocks (#261)

lesson_09/oop/oop_app/src/main/java/com/codedifferently/lesson9/AaronSantiago/Book.java

@@ -0,0 +1,31 @@
+package com.codedifferently.lesson9.library;
+
+class Book {
+  private String title;
+  private String author;
+  private String ISBN;
+
+  public Book(String title, String author, String ISBN) {
+    this.title = title;
+    this.author = author;
+    this.ISBN = ISBN;
+  }
+
+  public String getTitle() {
+    return title;
+  }
+
+  public String getAuthor() {
+    return author;
+  }
+
+  public String getISBN() {
+    return ISBN;
+  }
+
+  public void displayBookDetails() {
+    System.out.println("Title: " + title);
+    System.out.println("Author: " + author);
+    System.out.println("ISBN: " + ISBN);
+  }
+}

lesson_09/oop/oop_app/src/main/java/com/codedifferently/lesson9/AaronSantiago/LibraryBuildingLog.java

@@ -0,0 +1,69 @@
+package com.codedifferently.lesson9.library;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class LibraryBuildingLog {
+  private Map<String, Book> books;
+  private List<LibraryGuest> guests;
+
+  public LibraryBuildingLog() {
+    this.books = new HashMap<>();
+    this.guests = new ArrayList<>();
+  }
+
+  public void addBook(Book book) {
+    books.put(book.getISBN(), book);
+  }
+
+  public boolean removeBook(String ISBN) {
+    return books.remove(ISBN) != null;
+  }
+
+  public void registerGuest(LibraryGuest guest) {
+    guests.add(guest);
+  }
+
+  public boolean checkOutBook(String ISBN, LibraryGuest guest) {
+    Book book = books.get(ISBN);
+    if (book != null && !isBookCheckedOut(book)) {
+      guest.checkOutBook(book);
+      return true;
+    }
+    return false;
+  }
+
+  public boolean returnBook(String ISBN, LibraryGuest guest) {
+    Book book = books.get(ISBN);
+    if (book != null) {
+      return guest.returnBook(book);
+    }
+    return false;
+  }
+
+  private boolean isBookCheckedOut(Book book) {
+    for (LibraryGuest guest : guests) {
+      if (guest.getCheckedOutBooks().contains(book)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  public void displayLibraryInformation() {
+    System.out.println("Library Books:");
+    books.values().forEach(Book::displayBookDetails);
+    System.out.println("\nLibrary Guests:");
+    guests.forEach(
+        guest -> {
+          System.out.println("Name: " + guest.getName());
+          if (!guest.getCheckedOutBooks().isEmpty()) {
+            guest.displayGuestDetails();
+          } else {
+            System.out.println("No books checked out.");
+          }
+        });
+  }
+}

lesson_09/oop/oop_app/src/main/java/com/codedifferently/lesson9/AaronSantiago/LibraryGuest.java

@@ -0,0 +1,42 @@
+package com.codedifferently.lesson9.library;
+
+import java.util.ArrayList;
+import java.util.List;
+
+class LibraryGuest {
+  private String name;
+  private List<Book> checkedOutBooks;
+
+  public LibraryGuest(String name) {
+    this.name = name;
+    this.checkedOutBooks = new ArrayList<>();
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public void checkOutBook(Book book) {
+    checkedOutBooks.add(book);
+  }
+
+  public boolean returnBook(Book book) {
+    return checkedOutBooks.remove(book);
+  }
+
+  public List<Book> getCheckedOutBooks() {
+    return checkedOutBooks;
+  }
+
+  public void displayGuestDetails() {
+    System.out.println("Guest Name: " + name);
+    System.out.println("Checked Out Books:");
+    for (Book book : checkedOutBooks) {
+      book.displayBookDetails();
+    }
+  }
+}

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

@@ -0,0 +1,16 @@
+package com.codedifferently.lesson9.library;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class BookTest {
+
+  @Test
+  public void testBookDetails() {
+    Book book = new Book("The Great Gatsby", "F. Scott Fitzgerald", "123456789");
+    assertEquals("The Great Gatsby", book.getTitle());
+    assertEquals("F. Scott Fitzgerald", book.getAuthor());
+    assertEquals("123456789", book.getISBN());
+  }
+}

lesson_09/oop/oop_app/src/test/java/com/codedifferently/lesson9/AaronSantiago/LibraryBuildingLogTest.java

@@ -0,0 +1,32 @@
+package com.codedifferently.lesson9.library;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class LibraryBuildingLogTest {
+  private LibraryBuildingLog library;
+  private Book book1;
+  private LibraryGuest guest;
+
+  @BeforeEach
+  public void setUp() {
+    library = new LibraryBuildingLog();
+    book1 = new Book("Harry Potter: Half-Blood Prince", "J.K. Rowling", "1122334455");
+    guest = new LibraryGuest("Voldemort");
+
+    library.addBook(book1);
+    library.registerGuest(guest);
+  }
+
+  @Test
+  public void testCheckOutAndReturnBook() {
+    assertFalse(library.checkOutBook("NonExistentISBN", guest));
+    assertTrue(library.checkOutBook(book1.getISBN(), guest));
+    assertFalse(library.checkOutBook(book1.getISBN(), guest), "Book should already be checked out");
+
+    assertTrue(library.returnBook(book1.getISBN(), guest));
+    assertFalse(library.returnBook(book1.getISBN(), guest), "Book was already returned");
+  }
+}

lesson_09/oop/oop_app/src/test/java/com/codedifferently/lesson9/AaronSantiago/LibraryGuestTest.java

@@ -0,0 +1,29 @@
+package com.codedifferently.lesson9.library;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class LibraryGuestTest {
+  private Book book1;
+  private LibraryGuest guest;
+
+  @BeforeEach
+  public void setUp() {
+    book1 = new Book("No Man's Land", "Greg Rucka", "987654321");
+    guest = new LibraryGuest("Batman");
+  }
+
+  @Test
+  public void testCheckOutAndReturnBook() {
+    assertTrue(guest.getCheckedOutBooks().isEmpty());
+
+    guest.checkOutBook(book1);
+    assertEquals(1, guest.getCheckedOutBooks().size());
+    assertEquals(book1, guest.getCheckedOutBooks().get(0));
+
+    guest.returnBook(book1);
+    assertTrue(guest.getCheckedOutBooks().isEmpty());
+  }
+}