using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Factory_Method
{
    /// <summary>

    /// MainApp startup class for Structural 

    /// Factory Method Design Pattern.

    /// </summary>

    class MainApp
    {
        /// <summary>

        /// Entry point into console application.

        /// </summary>

        static void Main()
        {
            // An array of creators

            Creator[] creators = new Creator[2];

            creators[0] = new ConcreteCreatorA();
            creators[1] = new ConcreteCreatorB();

            // Iterate over creators and create products

            foreach (Creator creator in creators)
            {
                Product product = creator.FactoryMethod();
                Console.WriteLine("Created {0}",
                  product.GetType().Name);
            }

            // Wait for user

            Console.ReadKey();
        }
    }

    /// <summary>

    /// The 'Product' abstract class

    /// </summary>

    abstract class Product
    {
    }

    /// <summary>

    /// A 'ConcreteProduct' class

    /// </summary>

    class ConcreteProductA : Product
    {
    }

    /// <summary>

    /// A 'ConcreteProduct' class

    /// </summary>

    class ConcreteProductB : Product
    {
    }

    /// <summary>

    /// The 'Creator' abstract class

    /// </summary>

    abstract class Creator
    {
        public abstract Product FactoryMethod();
    }

    /// <summary>

    /// A 'ConcreteCreator' class

    /// </summary>

    class ConcreteCreatorA : Creator
    {
        public override Product FactoryMethod()
        {
            return new ConcreteProductA();
        }
    }

    /// <summary>

    /// A 'ConcreteCreator' class

    /// </summary>

    class ConcreteCreatorB : Creator
    {
        public override Product FactoryMethod()
        {
            return new ConcreteProductB();
        }
    }
}