Builder Design Pattern in c#

Builder: This pattern separate the construction of a complex object from its representation so that the same construction process can create different representations.

The Builder Design Pattern helps us to slice the operations of building an object. 

      It also enforces a process to create an object as a finished product. 

      That means an object has to be massaged by some instructed steps before it is ready and can be used by others.

     

     * Eg: To make a monkey, then pick the set of monkey molds to start.

        Step 1. Make monkey head.

        Step 2. Make monkey body.

        Step 3. Make monkey leg.

        Step 4. Make monkey arm.

        Step 5. Make monkey tail.

   class Program
    {
        static void Main(string[] args)
        {
            //create a constructor object to start building
            Kid aKid = new Kid();
            aKid.Name = "param";

            //param use Monkey mold to make a monkey
            Console.WriteLine("{0} start making a monkey", aKid.Name);
            AnimalBuilder builderA = new MonkeyBuilder();
            aKid.MakeAnimal(builderA);
            builderA.aAnimal.ShowMe();

            //param use Kitten mold to make a kitten
            Console.WriteLine("{0} start making a kitten", aKid.Name);
            AnimalBuilder builderB = new KittenBuilder();
            aKid.MakeAnimal(builderB);
            builderB.aAnimal.ShowMe();

            Console.Read();
        }
    }

    public abstract class Animal
    {
        public string Head { get; set; }
        public string Body { get; set; }
        public string Leg { get; set; }
        public string Arm { get; set; }
        public string Tail { get; set; }

        //helper method for demo the Polymorphism, so we can easily tell what type object it is from client.
        public abstract void Eat();

        //helper method for demo the result from client
        public void ShowMe()
        {
            Console.WriteLine(Head);
            Console.WriteLine(Body);
            Console.WriteLine(Leg);
            Console.WriteLine(Arm);
            Console.WriteLine(Tail);
            Eat();

        }
    }

    public abstract class AnimalBuilder
    {
        public Animal aAnimal;

        public abstract void BuildAnimalHeader();
        public abstract void BuildAnimalBody();
        public abstract void BuildAnimalLeg();
        public abstract void BuildAnimalArm();
        public abstract void BuildAnimalTail();
    }


    //
    public class MonkeyBuilder : AnimalBuilder
    {

        public MonkeyBuilder()
        {
            aAnimal = new Monkey();
        }

        public override void BuildAnimalHeader()
        {
            aAnimal.Head = "Moneky's Head has been built";
        }

        public override void BuildAnimalBody()
        {
            aAnimal.Body = "Moneky's Body has been built";
        }

        public override void BuildAnimalLeg()
        {
            aAnimal.Leg = "Moneky's Leg has been built";
        }

        public override void BuildAnimalArm()
        {
            aAnimal.Arm = "Moneky's Arm has been built";
        }

        public override void BuildAnimalTail()
        {
            aAnimal.Tail = "Moneky's Tail has been built";
        }
    }
    public class KittenBuilder : AnimalBuilder
    {
        public KittenBuilder()
        {
            aAnimal = new Kitten();
        }

        public override void BuildAnimalHeader()
        {
            aAnimal.Head = "Kitten's Head has been built";
        }

        public override void BuildAnimalBody()
        {
            aAnimal.Body = "Kitten's Body has been built";
        }

        public override void BuildAnimalLeg()
        {
            aAnimal.Leg = "Kitten's Leg has been built";
        }

        public override void BuildAnimalArm()
        {
            aAnimal.Arm = "Kitten's Arm has been built";
        }

        public override void BuildAnimalTail()
        {
            aAnimal.Tail = "Kitten's Tail has been built";
        }
    }
    public class Monkey : Animal
    {
        //helper method to show monkey's property for demo purpose
        public override void Eat()
        {
            Console.WriteLine("Since I am Monkey, I like to eat banana");
        }
    }
    public class Kitten : Animal
    {
        public override void Eat()
        {
            Console.WriteLine("Since I am Kitten, I like to eat kitten food");
        }
    }
    public class Kid
    {
        public string Name { get; set; }

        //construct process to build an animal object, 
        //after this process completed, a object 
        //will be consider as a ready to use object.
        public void MakeAnimal(AnimalBuilder aAnimalBuilder)
        {
            aAnimalBuilder.BuildAnimalHeader();
            aAnimalBuilder.BuildAnimalBody();
            aAnimalBuilder.BuildAnimalLeg();
            aAnimalBuilder.BuildAnimalArm();
            aAnimalBuilder.BuildAnimalTail();
        }

    }