Enock Ladu

src/main/java/com/booleanuk/core/Article.java

@@ -1,35 +1,8 @@
 package com.booleanuk.core;
 
-public class Article {
-    String title;
-
-    boolean onLoan = false;
+public class Article extends Stock{
 
     public Article(String title) {
-        this.title = title;
-    }
-
-    public boolean isOnLoan() {
-        return onLoan;
-    }
-
-    public String checkIn() {
-        if (!this.isOnLoan()) {
-            return "item is not currently on loan";
-        }
-
-        this.onLoan = false;
-
-        return "item has been checked in";
-    }
-
-    public String checkOut() {
-        if (this.isOnLoan()) {
-            return "item is currently on loan";
-        }
-
-        this.onLoan = true;
-
-        return "item has been checked out";
+        super(title);
     }
 }

src/main/java/com/booleanuk/core/Author.java

@@ -0,0 +1,41 @@
+package com.booleanuk.core;
+
+public class Author {
+
+    String name;
+
+    String contactInformation;
+
+    String website;
+
+    Article article;
+    Book book;
+    Newspaper newspaper;
+
+    public Author(Article article, String name, String contactInformation, String website) {
+        this.article = article;
+        this.name = name;
+        this.contactInformation = contactInformation;
+        this.website = website;
+    }
+    public Author(Book book, String name, String contactInformation, String website) {
+        this.book = book;
+        this.name = name;
+        this.contactInformation = contactInformation;
+        this.website = website;
+    }
+
+    public String getArticleAuthorInfo() {
+        return "Article: " + article.title +
+                "Author name: " + this.name +
+                ", Contact information: " + this.contactInformation +
+                ", Website: " + this.website;
+    }
+
+    public String getBookAuthorInfo() {
+        return "Book: " + book.title +
+                "Author name: " + this.name +
+                ", Contact information: " + this.contactInformation +
+                ", Website: " + this.website;
+    }
+}

src/main/java/com/booleanuk/core/Book.java

@@ -1,35 +1,8 @@
 package com.booleanuk.core;
 
-public class Book {
-    String title;
-
-    boolean onLoan = false;
+public class Book extends Stock {
 
     public Book(String title) {
-        this.title = title;
-    }
-
-    public boolean isOnLoan() {
-        return onLoan;
-    }
-
-    public String checkIn() {
-        if (!this.isOnLoan()) {
-            return "item is not currently on loan";
-        }
-
-        this.onLoan = false;
-
-        return "item has been checked in";
-    }
-
-    public String checkOut() {
-        if (this.isOnLoan()) {
-            return "item is currently on loan";
-        }
-
-        this.onLoan = true;
-
-        return "item has been checked out";
+        super(title);
     }
 }

src/main/java/com/booleanuk/core/Library.java

@@ -1,77 +1,20 @@
 package com.booleanuk.core;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class Library {
-    List<Article> articles;
-    List<Book> books;
-    List<Newspaper> newspapers;
+    List<Stock> stockItems = new ArrayList<>();
 
-    public void addToStock(Article item) {
-        this.articles.add(item);
-    }
-
-    public void addToStock(Book item) {
-        this.books.add(item);
-    }
-
-    public void addToStock(Newspaper item) {
-        this.newspapers.add(item);
+    public void addToStock(Stock item) {
+        this.stockItems.add(item);
     }
 
     // The following methods may contain code that you are unfamiliar with. The strange syntax of article -> something
     // is called a lambda expression (https://www.w3schools.com/java/java_lambda.asp)
-    public String checkInArticle(String title) {
-        List<Article> filtered = this.articles.stream()
-                .filter(article -> article.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkIn();
-    }
-
-    public String checkOutArticle(String title) {
-        List<Article> filtered = this.articles.stream()
-                .filter(article -> article.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkOut();
-    }
-
-    public String checkInBook(String title) {
-        List<Book> filtered = this.books.stream()
-                .filter(book -> book.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkIn();
-    }
-
-    public String checkOutBook(String title) {
-        List<Book> filtered = this.books.stream()
-                .filter(book -> book.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkOut();
-    }
-
-    public String checkInNewspaper(String title) {
-        List<Newspaper> filtered = this.newspapers.stream()
-                .filter(newspaper -> newspaper.title.equals(title))
+    public String checkInStock(String title) {
+        List<Stock> filtered = this.stockItems.stream()
+                .filter(stock -> stock.title.equals(title))
                 .toList();
 
         if (filtered.size() < 1) {
@@ -81,9 +24,9 @@ public String checkInNewspaper(String title) {
         return filtered.get(0).checkIn();
     }
 
-    public String checkOutNewspaper(String title) {
-        List<Newspaper> filtered = this.newspapers.stream()
-                .filter(newspaper -> newspaper.title.equals(title))
+    public String checkOutStock(String title) {
+        List<Stock> filtered = this.stockItems.stream()
+                .filter(stock -> stock.title.equals(title))
                 .toList();
 
         if (filtered.size() < 1) {

src/main/java/com/booleanuk/core/Newspaper.java

@@ -1,22 +1,15 @@
 package com.booleanuk.core;
 
-public class Newspaper {
-    String title;
-
-    boolean onLoan = false;
-
+public class Newspaper extends Stock {
     public Newspaper(String title) {
-        this.title = title;
+        super(title);
     }
-
-    public boolean isOnLoan() {
-        return onLoan;
-    }
-
+    @Override
     public String checkIn() {
         return "newspapers are not available for loan";
     }
 
+    @Override
     public String checkOut() {
         return "newspapers are not available for loan";
     }

src/main/java/com/booleanuk/core/Stock.java

@@ -0,0 +1,35 @@
+package com.booleanuk.core;
+
+public class Stock {
+
+    String title;
+    boolean onLoan = false;
+
+    public Stock(String title) {
+        this.title = title;
+    }
+
+    public boolean isOnLoan() {
+        return onLoan;
+    }
+
+    public String checkIn() {
+        if (!this.isOnLoan()) {
+            return "item is not currently on loan";
+        }
+
+        this.onLoan = false;
+
+        return "item has been checked in";
+    }
+
+    public String checkOut() {
+        if (this.isOnLoan()) {
+            return "item is currently on loan";
+        }
+
+        this.onLoan = true;
+
+        return "item has been checked out";
+    }
+}

src/test/java/com/booleanuk/core/AuthorTest.java

@@ -0,0 +1,39 @@
+package com.booleanuk.core;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class AuthorTest {
+
+    @Test
+    void getArticleAuthorInfo() {
+        Article article = new Article("An Adventure to Space");
+        Author author = new Author(article,"Neil Degrasse Tyson", "[email protected]", "www.neildegrassetyson.com");
+
+        String result = "Article: An Adventure to Space" +
+                "Author name: Neil Degrasse Tyson" +
+                ", Contact information: [email protected]" +
+                ", Website: www.neildegrassetyson.com";
+
+        String expectedResult = author.getArticleAuthorInfo();
+
+        Assertions.assertEquals(expectedResult, result);
+    }
+
+    @Test
+    void getBookAuthorInfo() {
+        Book book = new Book("Lord of the Rings");
+        Author author = new Author(book,"JRR Tolkien", "[email protected]", "www.lordoftherings.com");
+
+        String result = "Book: Lord of the Rings"  +
+                "Author name: JRR Tolkien" +
+                ", Contact information: [email protected]" +
+                ", Website: www.lordoftherings.com";
+
+        String expectedResult = author.getBookAuthorInfo();
+
+        Assertions.assertEquals(expectedResult, result);
+    }
+}