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
}