static void Main(string[] args) { Console.WriteLine("Visitor Pattern"); #region Visitor pattern - simple NumberCollection numberCollection = new NumberCollection(); //showing the current list numberCollection.DisplayList(); IncrementNumberVisitor incrementNumberVisitor = new IncrementNumberVisitor(); //visiting the list Console.WriteLine("IncrementNumberVisitor is about to visit the list:"); numberCollection.Accept(incrementNumberVisitor); //showing the current list numberCollection.DisplayList(); Console.WriteLine(); Console.WriteLine(); #endregion #region Visitor pattern - composite pattern #region Mathematics department //2 lecturers work in Mathematics department Employee mathTeacher1 = new Employee() { Name = "M. Joy", Dept = "Mathematic", Designation = "Lecturer", Experience = 13.7 }; Employee mathTeacher2 = new Employee() { Name = "M. Roony", Dept = "Mathematic", Designation = "Lecturer", Experience = 6.5 }; //the college has a Head of Department in Mathematics CompositeEmployee hodMathematic = new CompositeEmployee() { Name = "Mrs. S.Das", Dept = "Maths", Designation = "HOD-Maths", Experience = 14 }; //lecturers of mathematics directly reports to HOD-Maths hodMathematic.AddEmployee(mathTeacher1); hodMathematic.AddEmployee(mathTeacher2); #endregion #region Computer Science departments //3 lecturers work in Computer Science department Employee csTeacher1 = new Employee() { Name = "C. Sam", Dept = "Computer Science", Designation = "Lecturer", Experience = 10.2 }; Employee csTeacher2 = new Employee() { Name = "C. Jones", Dept = "Computer Science", Designation = "Lecturer", Experience = 13.5 }; Employee csTeacher3 = new Employee() { Name = "C. Marium", Dept = "Computer Science", Designation = "Lecturer", Experience = 7.3 }; //the college has a Head of Department in Computer Science CompositeEmployee hodComputerScience = new CompositeEmployee() { Name = "Mr. V.Sarcar", Dept = "Computer Science", Designation = "HOD-CS", Experience = 16.5 }; //lecturers of Computer Science directly report to HOD-CS hodComputerScience.AddEmployee(csTeacher1); hodComputerScience.AddEmployee(csTeacher2); hodComputerScience.AddEmployee(csTeacher3); #endregion #region Top level management //the collage also has a Principal CompositeEmployee principal = new CompositeEmployee() { Name = "Dr. S.Som", Dept = "Planning-Supervising-Managing", Designation = "Principal", Experience = 21 }; //hods of Maths and CS directly report to Principal principal.AddEmployee(hodMathematic); principal.AddEmployee(hodComputerScience); #endregion //printing the leaf-nodes and branches in the same way //in each case we are calling DisplayDetails() method Console.WriteLine("Details of a Principal object is as follows:"); //prints the complete structure principal.DisplayDetails(); Console.WriteLine("Details of a HOD object is as follows:"); //print details of Computer Science department hodComputerScience.DisplayDetails(); //leaf node Console.WriteLine("Details of an individual employee (leaf node) is as follows:"); mathTeacher1.DisplayDetails(); //suppose, one Computer Science lecturer (C. Jones) is leaving now from the organization hodComputerScience.RemoveEmployee(csTeacher2); Console.WriteLine("After the resignation of C. Jones, the organization has the following members:"); principal.DisplayDetails(); List <IEmployee> participants = new List <IEmployee>(); //for employees who directly reports to Principal foreach (IEmployee employee in principal.subordinateList) { participants.Add(employee); } //for employees who directly reports to HOD-Maths foreach (IEmployee employee in hodMathematic.subordinateList) { participants.Add(employee); } //for employees who directly reports to HOD-CS foreach (IEmployee employee in hodComputerScience.subordinateList) { participants.Add(employee); } Console.WriteLine("Visitor starts visiting our composite structure."); VisitorWithCompositePattern.IVisitor visitor = new PromotionCheckerVisitor(); //principal is already holding the highest position //we are not checking if he is eligible or not foreach (IEmployee employee in participants) { employee.Accept(visitor); } #endregion Console.Read(); }
static void Main(string[] args) { //Creational Patterns Console.WriteLine("Creational Patterns"); #region Singleton Console.WriteLine("***Singleton Pattern Demo***\n"); Console.WriteLine("Trying to create instance s1."); Singleton s1 = Singleton.Instance; Console.WriteLine("Trying to create instance s2."); Singleton s2 = Singleton.Instance; if (s1 == s2) { Console.WriteLine("Only one instance exists."); } else { Console.WriteLine("Different instances exists."); } #endregion Console.WriteLine("###########################"); #region Prototype Console.WriteLine("***Prototype Pattern Demo***\n"); //Base or Original BasicCar nano_base = new Nano("Green Nano") { Price = 100000 }; BasicCar ford_base = new Ford("FordYellow") { Price = 500000 }; BasicCar bc1; //Nano bc1 = nano_base.Clone(); bc1.Price = nano_base.Price + BasicCar.SetPrice(); Console.WriteLine($"Car is {bc1.ModelName}, and price is {bc1.Price}"); //Ford bc1 = ford_base.Clone(); bc1.Price = ford_base.Price + BasicCar.SetPrice(); Console.WriteLine($"Car is {bc1.ModelName}, and price is {bc1.Price}"); #endregion Console.WriteLine("###########################"); #region Buuilder Console.WriteLine("***Builder Pattern Demo***"); Director director = new Director(); IBuilder b1 = new Car("Ford"); IBuilder b2 = new MotorCycle("Honda"); //Mking Car director.Construct(b1); Product p1 = b1.GetVehicle(); p1.Show(); //Making Motorcycle director.Construct(b2); Product p2 = b2.GetVehicle(); p2.Show(); #endregion Console.WriteLine("###########################"); #region Factory Method Pattern Console.WriteLine("***Factory Pattern Demo***\n"); // Creating a Tiger Factory AnimalFactory tigerFactory = new TigerFactory(); // Creating a tiger using the Factory Method IAnimal aTiger = tigerFactory.CreateAnimal(); aTiger.AboutMe(); aTiger.Action(); // Creating a DogFactory AnimalFactory dogFactory = new DogFactory(); // Creating a dog using the Factory Method IAnimal aDog = dogFactory.CreateAnimal(); aDog.AboutMe(); aDog.Action(); #endregion Console.WriteLine("###########################"); #region Abstract Factory Pattern Console.WriteLine("***Abstract Factory Pattern Demo***\n"); //Making a wild dog through WildAnimalFactory IAnimalFactory wildAnimalFactory = new WildAnimalFactory(); IDog wildDog = wildAnimalFactory.GetDog(); wildDog.Speak(); wildDog.Action(); //Making a wild tiger through WildAnimalFactory ITiger wildTiger = wildAnimalFactory.GetTiger(); wildTiger.Speak(); wildTiger.Action(); Console.WriteLine("******************"); //Making a pet dog through PetAnimalFactory IAnimalFactory petAnimalFactory = new PetAnimalFactory(); IDog petDog = petAnimalFactory.GetDog(); petDog.Speak(); petDog.Action(); //Making a pet tiger through PetAnimalFactory ITiger petTiger = petAnimalFactory.GetTiger(); petTiger.Speak(); petTiger.Action(); #endregion Console.WriteLine("###########################"); //Structural Patterns Console.WriteLine("Structural Patterns"); #region Proxy Pattern Console.WriteLine("***Proxy Pattern Demo***"); Proxy px = new Proxy(); px.DoSomeWork(); #endregion Console.WriteLine("###########################"); #region Decorator Pattern Console.WriteLine("***Decorator Pattern Simulation***"); ConcreteComponent cc = new ConcreteComponent(); ConcreteDecoratorEx1 decorator1 = new ConcreteDecoratorEx1(); decorator1.SetTheComponent(cc); decorator1.MakeHouse(); ConcreteDecoratorEx2 decorator2 = new ConcreteDecoratorEx2(); //Adding results from decorator1 decorator2.SetTheComponent(decorator1); decorator2.MakeHouse(); #endregion Console.WriteLine("###########################"); #region Adapter Pattern Console.WriteLine("***Adapter Pattern Demo***\n"); CalculatorAdapter cal = new CalculatorAdapter(); Triangle t = new Triangle(20, 10); Console.WriteLine($"Area of Triangle is {cal.GetArea(t)} square unit"); #endregion Console.WriteLine("###########################"); #region Facade Pattern Console.WriteLine("***Facade Pattern Demo***"); RobotFacade robotFacade1 = new RobotFacade(); // Creating Robots robotFacade1.ConstructMilanoRobot(); RobotFacade robotFacade2 = new RobotFacade(); // Creating Robots robotFacade2.ConstructRobonautRobot(); robotFacade1.DestroyMilanoRobot(); //Destroying Robots robotFacade2.DestroyRobonautRobot(); #endregion Console.WriteLine("###########################"); #region Flyweight Pattern Console.WriteLine("***Flyweight Pattern Demo***"); RobotFactory myFactory = new RobotFactory(); IRobot shape = myFactory.GetRobotFromFactory("Small"); shape.Print(); //Creating small robots for (int i = 0; i < 2; i++) { shape = myFactory.GetRobotFromFactory("Small"); shape.Print(); } int numOfDistinctRobots = myFactory.TotalObjectsCreated; Console.WriteLine($"Number of distinct robot objects is {numOfDistinctRobots}"); //Creating large robots for (int i = 0; i < 5; i++) { shape = myFactory.GetRobotFromFactory("Large"); shape.Print(); } numOfDistinctRobots = myFactory.TotalObjectsCreated; Console.WriteLine($"Distinct robot objects created till now {numOfDistinctRobots}"); #endregion Console.WriteLine("###########################"); #region Composite Pattern #region Mathematics department Console.WriteLine("***Composite Pattern***"); //2 Lecturers work in Mathematics department Employee mathLecturer1 = new Employee { Name = "M. Joy", Dept = "Mathematics", Designation = "Lecturer" }; Employee mathLecturer2 = new Employee { Name = "M. Ronny", Dept = "Mathematics", Designation = "Lecturer" }; //The college has Head of Department in Mathematics CompositeEmployee hodMaths = new CompositeEmployee { Name = "Mrs. S. Das", Dept = "Maths", Designation = "HOD-Maths" }; //Lecturers of Mathematics directly perort to HOD-Maths hodMaths.AddEmpployee(mathLecturer1); hodMaths.AddEmpployee(mathLecturer2); #endregion #region Computer Science department //3 lecturers work in Computer Sc. department Employee cseLecturer1 = new Employee { Name = "C. Sam", Dept = "Computer Sciense", Designation = "Lecturer" }; Employee cseLecturer2 = new Employee { Name = "C. Jones", Dept = "Computer Sciense", Designation = "Lecturer" }; Employee cseLecturer3 = new Employee { Name = "C. Marium", Dept = "Computer Sciense", Designation = "Lecturer" }; //The College has a Head of Department in Computer science CompositeEmployee hodCompSc = new CompositeEmployee { Name = "Mr. V. Sarcar", Dept = "Computer Sc.", Designation = "HOD-Computer Sc." }; //Lecturers of Computer Sc. directly reports to HOD-CSE hodCompSc.AddEmpployee(cseLecturer1); hodCompSc.AddEmpployee(cseLecturer2); hodCompSc.AddEmpployee(cseLecturer3); #endregion #region Top level management //College Principial CompositeEmployee principal = new CompositeEmployee { Name = "Dr.S.Som", Dept = "Planning-Supervising-Managing", Designation = "Principal" }; //Mead of Department of Math and Computer Sciense apply to Principal principal.AddEmpployee(hodMaths); principal.AddEmpployee(hodCompSc); #endregion Console.WriteLine("Details of a Principal are these: "); principal.DisplayDetails(); Console.WriteLine("Details of HOD object are these: "); hodCompSc.DisplayDetails(); Console.WriteLine("Details of individual employee are these: "); mathLecturer1.DisplayDetails(); //Lecturer leaves hodCompSc.RemoveEmployee(cseLecturer2); Console.WriteLine("After resignstion there are only these leecturers"); principal.DisplayDetails(); #endregion }