BuilderPatternExample1.cs

//-------------------------------------------------------------------------------------
//	BuilderPatternExample1.cs
//-------------------------------------------------------------------------------------

using System;
using UnityEngine;
using System.Collections;
using System.Collections.Generic;

//This real-world code demonstates the Builder pattern in which different vehicles are assembled in a step-by-step fashion. 
//The Shop uses VehicleBuilders to construct a variety of Vehicles in a series of sequential steps.

namespace BuilderPatternExample1
{
    public class BuilderPatternExample1 : MonoBehaviour
    {
        void Start()
        {
            VehicleBuilder builder;

            // Create shop with vehicle builders
            Shop shop = new Shop();

            // Construct and display vehicles
            builder = new ScooterBuilder();
            shop.Construct(builder);
            builder.Vehicle.Show();

            builder = new CarBuilder();
            shop.Construct(builder);
            builder.Vehicle.Show();

            builder = new MotorCycleBuilder();
            shop.Construct(builder);
            builder.Vehicle.Show();
        }
    }

    class Shop
    {
        // Builder uses a complex series of steps
        public void Construct(VehicleBuilder vehicleBuilder)
        {
            vehicleBuilder.BuildFrame();
            vehicleBuilder.BuildEngine();
            vehicleBuilder.BuildWheels();
            vehicleBuilder.BuildDoors();
        }
    }

    abstract class VehicleBuilder
    {
        protected Vehicle vehicle;

        public Vehicle Vehicle
        {
            get { return vehicle; }
        }

        public abstract void BuildFrame();
        public abstract void BuildEngine();
        public abstract void BuildWheels();
        public abstract void BuildDoors();
    }

    class MotorCycleBuilder : VehicleBuilder
    {
        public MotorCycleBuilder()
        {
            vehicle = new Vehicle("MotorCycle");
        }

        public override void BuildFrame()
        {
            vehicle["frame"] = "MotorCycle Frame";
        }

        public override void BuildEngine()
        {
            vehicle["engine"] = "500 cc";
        }

        public override void BuildWheels()
        {
            vehicle["wheels"] = "2";
        }

        public override void BuildDoors()
        {
            vehicle["doors"] = "0";
        }
    }

    class CarBuilder : VehicleBuilder
    {
        public CarBuilder()
        {
            vehicle = new Vehicle("Car");
        }

        public override void BuildFrame()
        {
            vehicle["frame"] = "Car Frame";
        }

        public override void BuildEngine()
        {
            vehicle["engine"] = "2500 cc";
        }

        public override void BuildWheels()
        {
            vehicle["wheels"] = "4";
        }

        public override void BuildDoors()
        {
            vehicle["doors"] = "4";
        }
    }

    class ScooterBuilder : VehicleBuilder
    {
        public ScooterBuilder()
        {
            vehicle = new Vehicle("Scooter");
        }

        public override void BuildFrame()
        {
            vehicle["frame"] = "Scooter Frame";
        }

        public override void BuildEngine()
        {
            vehicle["engine"] = "50 cc";
        }

        public override void BuildWheels()
        {
            vehicle["wheels"] = "2";
        }

        public override void BuildDoors()
        {
            vehicle["doors"] = "0";
        }
    }

    class Vehicle
    {
        private string _vehicleType;
        private Dictionary<string, string> _parts = new Dictionary<string, string>();

        public Vehicle(string vehicleType)
        {
            this._vehicleType = vehicleType;
        }

        public string this[string key]
        {
            get { return _parts[key]; }
            set { _parts[key] = value; }
        }

        public void Show()
        {
            Debug.Log("\n---------------------------");
            Debug.Log("Vehicle Type: " + _vehicleType);
            Debug.Log(" Frame : " + _parts["frame"]);
            Debug.Log(" Engine : " + _parts["engine"]);
            Debug.Log(" #Wheels: " + _parts["wheels"]);
            Debug.Log(" #Doors : " + _parts["doors"]);
        }
    }
}