This
pattern allows to set up a tree structure and ask each element in the tree
structure to perform a task. A typical tree structure would be a company organization
chart, where the CEO is at the top and other employees at the bottom. After the
tree structure is established, you can then ask each element, or employee, to
perform a common operation.
Fig:Simple Concept of composite pattern
Fig:Class UML of composite pattern
- Create a console
project in visual studio
- Create Interface of
named it IEmployee
IEmployee.cs
public interface IEmployee
{
void ShowLevel();
}
- Create a class Worker
and implement IEmployee
public class Worker:IEmployee
{
private string name;
private int level;
public Worker(string name, int level)
{
this.name
= name;
this.level
= level;
}
void IEmployee.ShowLevel()
{
Console.WriteLine(name
+ " Access Level:" + level);
}
}
- Create Admin class and implement
IEmployee
public class Admin:IEmployee
{
private string name;
private int level;
private List<IEmployee> subLevelObj = new List<IEmployee>();
public Admin(string name, int level)
{
this.name
= name;
this.level
= level;
}
void IEmployee.ShowLevel()
{
Console.WriteLine(name
+ " Access level of:" + level);
//show all sub level
foreach (IEmployee i in subLevelObj)
i.ShowLevel();
}
public void AddSubLevel(IEmployee employeeObj)
{
subLevelObj.Add(employeeObj);
}
}
- In the
programs.cs file
static void Main(string[] args)
{
Worker aObj = new Worker("Faruk",4);
Admin bObj = new Admin("Omar", 7);
Admin cObj = new Admin("Jubayer",9);
Admin dObj = new Admin("Khalid",8);
Worker eObj = new Worker("Miki",6);
Worker fObj = new Worker("Rajib",5);
//Now Setup the relations
bObj.AddSubLevel(dObj); //khalid belongs to Omar
dObj.AddSubLevel(eObj); //miki belongs to khalid
cObj.AddSubLevel(bObj); //Omar belongs to Jubayer
cObj.AddSubLevel(fObj); //Rajib belongs to Jubayer
bObj.AddSubLevel(aObj); //Faruk belongs to Omar
//Jubayer shows the lavel and ask everyont to do
the same
if (cObj is IEmployee)
(cObj as IEmployee).ShowLevel();
Console.ReadKey();
}
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