ecassell DesignPatterns Training

DesignPatternsSolution/Execise.Tests/UnitTests.cs

@@ -12,27 +12,38 @@ public void LibraryShouldBeSingleton()
         {
             //check that when you create a Library instance second time, 
             //you get exactly the same instance as for a very first time
+            Assert.IsTrue(Library.getInstance() == Library.getInstance());
         }
 
         //test that an book was registered successfully by checking the returned Id value is not -1
         [TestMethod]
         public void BookShouldRegister()
         {
+            var book = new Book("George Orwell", "1984", 1934, 5);
+            RegistrationRepository.Register(book);
+            Assert.IsFalse(book.ObjectId == -1);
         }
 
         //test that an customer was registered successfully by checking the returned Id value is not -1
         [TestMethod]
         public void CustomerShouldRegister()
         {
+            var customer = new Customer("George Orwell", "19 Eightyfour Lane");
+            RegistrationRepository.Register(customer);
+            Assert.IsFalse(customer.ObjectId == -1);
         }
 
         //test that a book can be borrowed
         [TestMethod]
         public void CanBorrowBook()
         {
-            //create a borrowable book with available amount more than one. 
+            //create a borrowable book with available amount more than one.
+            var borrowableBook = new BookBorrowable(new Book("Isaac Asimov", "Foundation", 1974, 4));
+            int initialAmount = borrowableBook.BookToBeBorrowed.AvailableAmount;
+            borrowableBook.BorrowOne();
+            int afterBorrowedAmount = borrowableBook.BookToBeBorrowed.AvailableAmount;
             //Run BorrowOne method of the BookBorrowable instance. Check that total amount was reduced by one.
-
+            Assert.IsTrue(afterBorrowedAmount == (initialAmount - 1));
         }       
     }
 }

DesignPatternsSolution/Exercise/BookBorrowable.cs

@@ -1,7 +1,27 @@
-namespace Exercise
+using System;
+
+namespace Exercise
 {
-    public class BookBorrowable 
+    public class BookBorrowable
     {
+        public Book BookToBeBorrowed { get; set; }
+
+        public BookBorrowable(Book book)
+        {
+            BookToBeBorrowed = book;
+        }
+
+        public void BorrowOne()
+        {
+            if (BookToBeBorrowed.AvailableAmount > 0)
+            {
+                BookToBeBorrowed.AvailableAmount--;
+            }
+            else
+            {
+                Console.WriteLine("No amount left to borrow for this book: " + BookToBeBorrowed.NameOrTitle);
+            }
+        }
 
     }
 }

DesignPatternsSolution/Exercise/Item.cs

@@ -19,4 +19,13 @@ public Book(string author, string title, int year, int amount) : base(amount, ye
         }
         public string Author { get; set; }
     }
+
+    public class Video : Item
+    {
+        public Video(string title, int year, int amount)
+            : base(amount, year)
+        {
+            NameOrTitle = title;
+        }
+    }
 }

DesignPatternsSolution/Exercise/LibObject.cs

@@ -1,12 +1,19 @@
-namespace Exercise
+using System.Runtime.Remoting.Messaging;
+
+namespace Exercise
 {
-    public abstract class LibObject
+    public abstract class LibObject : IRegistarable
     {
         public int ObjectId { get; set; }
         public int AvailableAmount { get; set; }
         public string NameOrTitle { get; set; }
         public ObjectType ObjType { get; set; }
         public int YearCreated { get; set; }
+
+        public RegisteredObject GetRegistrationInfo()
+        {
+            return new RegisteredObject(this);
+        }
     }
 
     public enum ObjectType

DesignPatternsSolution/Exercise/Library.cs

@@ -4,7 +4,16 @@ public class Library
     {
         //implement Singleton to make sure only one library will exist
 
-
+        static Library instance = new Library();
+
+        private Library()
+        {
+        }
+
+        public static Library getInstance()
+        {
+            return instance;
+        }
 
         //Implement Register method by utilizing RegistrationRepository (complete missing parts)
         public int Register()

DesignPatternsSolution/Exercise/Registration.cs

@@ -51,6 +51,13 @@ public class RegisteredObject
         public int Id { get; set; }
         public int AvailableAmount { get; set; }
 
+        public RegisteredObject(LibObject libObj)
+        {
+            Id = libObj.ObjectId;
+            Info = libObj.NameOrTitle;
+            AvailableAmount = libObj.AvailableAmount;
+        }
+
         public override string ToString()
         {
             return Info + " " + "Available: " + AvailableAmount;