* Patterns : Builder Creational Pattern

Builder Creational Pattern separates the process of construction of a complex object from its actual representation. This means that the same process can create different representations of same object.

Consider the following diagram :

The main class here is ShapeCreator which is called Director and controls the process of construction of object. 

    // Director
    public class ShapeCreator
    {
        public void CreateSquare(SquareBuilder sb)
        {
            sb.Create();
            sb.SetColor();
        }
    }

While Square is the actual object. RedSquareBuilder controls the actual representation of the object.

Consider the following client code :

    public class Client
    {
        ShapeCreator d;
        public void Run()
        {
            d = new ShapeCreator(); //Director
            SquareBuilder sb = new RedSquareBuilder();
            d.CreateSquare(sb);
            Square sq;
            sq = sb.GetSquare();
            Console.WriteLine(sq.Color + " Color Square created");
        }
    }

Just by changing the instance value of SquareBuilder, another representation of Square can be created by ShapeCreator.

Download full source code from here : Builder Creational Pattern source code