static void Main(string[] args)
{
Console.WriteLine("***Visitor Pattern with Composite Pattern Demo. ***");
#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 = "Mathematics", Designation = "Lecturer", Experience = 6.5
};
//The college has a Head of Department in Mathematics
CompositeEmployee hodMaths = new CompositeEmployee {
Name = "Mrs.S.Das", Dept = "Maths", Designation = "HOD-Maths", Experience = 14
};
//Lecturers of Mathematics directly reports to HOD-Maths
hodMaths.AddEmployee(mathTeacher1);
hodMaths.AddEmployee(mathTeacher2);
#endregion
#region Computer Science department
//3 lecturers work in Computer Sc. department
Employee cseTeacher1 = new Employee {
Name = "C.Sam", Dept = "Computer Science", Designation = "Lecturer", Experience = 10.2
};
Employee cseTeacher2 = new Employee {
Name = "C.Jones", Dept = "Computer Science.", Designation = "Lecturer", Experience = 13.5
};
Employee cseTeacher3 = new Employee {
Name = "C.Marium", Dept = "Computer Science", Designation = "Lecturer", Experience = 7.3
};
//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.", Experience = 16.5
};
//Lecturers of Computer Sc. directly reports to HOD-CSE
hodCompSc.AddEmployee(cseTeacher1);
hodCompSc.AddEmployee(cseTeacher2);
hodCompSc.AddEmployee(cseTeacher3);
#endregion
#region Top level management
//The college also has a Principal
CompositeEmployee principal = new CompositeEmployee {
Name = "Dr.S.Som", Dept = "Planning-Supervising-Managing", Designation = "Principal", Experience = 21
};
//Head of Departments's of Maths and Computer Science directly reports to Principal.
principal.AddEmployee(hodMaths);
principal.AddEmployee(hodCompSc);
#endregion
/*
* Printing the leaf-nodes and branches in the same way.
* i.e. in each case, we are calling DisplayDetails() method.
*/
Console.WriteLine("\nDetails of a college structure is as follows:");
//Prints the complete structure
principal.DisplayDetails();
List <IEmployee> participants = new List <IEmployee>();
//For employees who directly reports to Principal
foreach (IEmployee e in principal.subordinateList)
{
// e.Accept(aVisitor);
participants.Add(e);
}
//For employees who directly reports to HOD-Maths
foreach (IEmployee e in hodMaths.subordinateList)
{
//e.Accept(aVisitor);
participants.Add(e);
}
//For employees who directly reports to HOD-Comp.Sc
foreach (IEmployee e in hodCompSc.subordinateList)
{
//e.Accept(aVisitor);
participants.Add(e);
}
Console.WriteLine("\n***Visitor starts visiting our composite structure***\n");
IVisitor visitor = new PromotionCheckerVisitor();
/*
* Principal is already holding the highest position.
* We are not checking whether he is eligible
* for promotion or not.
*/
//principal.Accept(visitor);
//Visitor is traversing the participant list
foreach (IEmployee emp in participants)
{
emp.Accept(visitor);
}
//Wait for user
Console.ReadKey();
}
public void VisitEmployees(CompositeEmployee employee)
{
//We'll promote them if experience is greater than 15 years
eligibleForPromotion = employee.Experience > 15 ? "Yes" : "No";
Console.WriteLine($"{ employee.Name } from {employee.Dept} is eligible for promotion? :{eligibleForPromotion}");
}