Solved

tdd-oop-inheritance.CSharp.Main/Article.cs

@@ -6,37 +6,12 @@
 
 namespace tdd_oop_inheritance.CSharp.Main
 {
-    public class Article {
-        public string title;
+    public class Article : Item {
 
-        bool onLoan = false;
+        public Author author { get; set; }
 
-        public Article(string title) {
-            this.title = title;
-        }
-
-        public bool 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";
+        public Article(Author author, string title) : base(title) {
+            this.author = author;
         }
     }
 }

tdd-oop-inheritance.CSharp.Main/Author.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace tdd_oop_inheritance.CSharp.Main
+{
+    public class Author
+    {
+        private string _authorname;
+        private string _authorwebsite;
+        private string _authorcontact;
+
+        public Author (string authorname, string authorwebsite, string authorcontact)
+        {
+            this._authorname = authorname;
+            this._authorwebsite = authorwebsite;
+            this._authorcontact = authorcontact;
+        }
+
+        public string AuthorName { get => _authorname; set => _authorname = value; }
+        public string AuthorWebsite { get => _authorwebsite; set => _authorwebsite = value; }   
+        public string AuthorContact { get => _authorcontact; set => _authorcontact = value; }       
+    }
+}

tdd-oop-inheritance.CSharp.Main/Book.cs

@@ -6,37 +6,12 @@
 
 namespace tdd_oop_inheritance.CSharp.Main
 {
-    public class Book {
-        public string title;
+    public class Book : Item {
 
-        bool onLoan = false;
+        public Author author {  get; set; }
 
-        public Book(string title) {
-            this.title = title;
-        }
-
-        public bool 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";
+        public Book(Author author, string title) : base (title) {
+            this.author = author;
         }
     }
 }

tdd-oop-inheritance.CSharp.Main/Item.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace tdd_oop_inheritance.CSharp.Main
+{
+    public class Item
+    {
+        private string _title;
+
+        public string Title { get => _title; set => _title = value; }
+
+        bool onLoan = false;
+
+        public Item(string title)
+        {
+            _title = title;
+        }
+
+        public bool isOnLoan()
+        {
+            return onLoan;
+        }
+
+        public virtual string checkIn()
+        {
+            if (!this.isOnLoan())
+            {
+                return "item is not currently on loan";
+            }
+
+            this.onLoan = false;
+            return "item has been checked in";
+        }
+
+        public virtual string checkOut()
+        {
+            if (this.isOnLoan())
+            {
+                return "item is currently on loan";
+            }
+
+            this.onLoan = true;
+
+            return "item has been checked out";
+        }        
+    }
+}

tdd-oop-inheritance.CSharp.Main/Library.cs

@@ -1,89 +1,71 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel.Design;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace tdd_oop_inheritance.CSharp.Main
 {
-    public class Library {
-        List<Article> articles = new List<Article>();
-        List<Book> books = new List<Book>();
-        List<Newspaper> newspapers = new List<Newspaper>();
+    public class Library
+    {
 
-        public void addToStock(Article item) {
-            this.articles.Add(item);
-        }
+        public List<Item> items = new List<Item>();
 
-        public void addToStock(Book item) {
-            this.books.Add(item);
-        }
+        public void addToStock(Item item)
+        {
+            this.items.Add(item);
 
-        public void addToStock(Newspaper item) {
-            this.newspapers.Add(item);
         }
+        public string checkInItem(string title)
+        {
 
-        // 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 = (List<Article>)this.articles.Where(article => article.title.Equals(title));
+            List<Item> filtered = (List<Item>)this.items.Where(item => item.Title.Equals(title));
 
-            if (filtered.Count() < 1) {
+            if (filtered.Count() < 1)
+            {
                 return "item is not part of the library's collection";
             }
 
             return filtered[0].checkIn();
         }
 
-        public string checkOutArticle(string title) {
-            List<Article> filtered = (List<Article>)this.articles.Where(article => article.title.Equals(title));
+        public string checkOutItem(string title)
+        {
+            List<Item> filtered = (List<Item>)this.items.Where(item => item.Title.Equals(title));
 
-            if (filtered.Count() < 1) {
+            if (filtered.Count() < 1)
+            {
                 return "item is not part of the library's collection";
             }
 
             return filtered[0].checkOut();
         }
 
-        public string checkInBook(string title) {
-            List<Book> filtered = (List<Book>)this.books.Where(book => book.Equals(title));
-
-            if (filtered.Count() < 1) {
-                return "item is not part of the library's collection";
+        public virtual string AuthorInfo(string title)
+        {
+            List<Item> filtered = (List<Item>)this.items
+                .Where(item => item.Title.Equals(title)).ToList();
+            if (filtered.Count() < 1)
+            {
+                return "Item is not part of lib collection";
             }
-
-            return filtered[0].checkIn();
-        }
-
-        public string checkOutBook(string title) {
-            List<Book> filtered = (List<Book>)this.books.Where(book => book.Equals(title));
-
-            if (filtered.Count() < 1) {
-                return "item is not part of the library's collection";
+            if (filtered[0] is Book)
+            {
+                Book book = (Book)filtered[0];
+                return book.author.AuthorName.ToString();
             }
+            else if (filtered[0] is Article)
+            {
+                Article article = (Article)filtered[0];
+                return article.author.AuthorName.ToString();
 
-            return filtered[0].checkOut();
-        }
-
-        public string checkInNewspaper(string title) {
-            List<Newspaper> filtered = (List<Newspaper>)this.newspapers.Where(newspaper => newspaper.title.Equals(title));
-
-            if (filtered.Count() < 1) {
-                return "item is not part of the library's collection";
             }
-
-            return filtered[0].checkIn();
-        }
-
-        public string checkOutNewspaper(string title) {
-            List<Newspaper> filtered = (List<Newspaper>)this.newspapers.Where(newspaper => newspaper.title.Equals(title));
-
-            if (filtered.Count() < 1) {
-                return "item is not part of the library's collection";
+            else
+            {
+                return "Item is not part of lib collection";
             }
 
-            return filtered[0].checkOut();
         }
     }
 }

tdd-oop-inheritance.CSharp.Main/Newspaper.cs

@@ -6,25 +6,24 @@
 
 namespace tdd_oop_inheritance.CSharp.Main
 {
-    public class Newspaper
+    public class Newspaper : Item
     {
-        public string title;
+        public Newspaper(string title) : base(title)
+        {
 
-        Boolean onLoan = false;
-
-        public Newspaper(string title) {
-            this.title = title;
         }
 
-        public bool isOnLoan() {
-            return onLoan;
-        }
+        //public Newspaper(string title) :base (title){
+        //    this.title = title;
+        //}
 
-        public string checkIn() {
+        public override string checkIn()
+        {
             return "newspapers are not available for loan";
         }
 
-        public string checkOut() {
+        public override string checkOut()
+        {
             return "newspapers are not available for loan";
         }
     }

tdd-oop-inheritance.CSharp.Test/ArticleTest.cs

@@ -8,33 +8,34 @@ class ArticleTest
         [Test]
         public void shouldCheckOutIfAvailable()
             {
-                Article article = new Article("JUnit Rocks");
+                Author author = new Author("Jane Doe", "Website", "@here");
+                Article article = new Article(author, "JUnit Rocks");
                 Assert.AreEqual("item has been checked out", article.checkOut());
             }
 
         [Test]
         public void shouldDeclineIfNotAvailableToCheckout()
             {
-                Article article = new Article("JUnit Rocks");
-                article.checkOut();
+                Author author = new Author("Jane Doe", "Website", "@here");
+                Article article = new Article(author, "JUnit Rocks"); article.checkOut();
 
                 Assert.AreEqual("item is currently on loan", article.checkOut());
             }
 
         [Test]
         public void shouldCheckInIfOnLoan()
             {
-                Article article = new Article("JUnit Rocks");
-                article.checkOut();
+                Author author = new Author("Jane Doe", "Website", "@here");
+                Article article = new Article(author, "JUnit Rocks"); article.checkOut();
 
                 Assert.AreEqual("item has been checked in", article.checkIn());
             }
 
         [Test]
         public void shouldDeclineCheckInIfNotOnLoan()
             {
-                Article article = new Article("JUnit Rocks");
-
+                Author author = new Author("Jane Doe", "Website", "@here");
+                Article article = new Article(author, "JUnit Rocks");
                 Assert.AreEqual("item is not currently on loan", article.checkIn());
             }
     }