【设计模式】之 Builder 建造者模式-优快云博客

本文链接：https://blog.youkuaiyun.com/sniper007/article/details/7319534

本文介绍了一种使用建造者模式创建不同类型的交通工具实例的方法。通过定义一个Vehicle基类和多个具体的建造者子类（如MotorCycleBuilder、CarBuilder、ScooterBuilder），可以构造出具有特定属性的车辆对象。

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

namespace DesignFactory.Builder
{

    /// <summary>
    /// 建造者模式
    /// </summary>
    class Vehicle
    {
        private string type;
        private Hashtable parts = new Hashtable();

        public Vehicle(string type)
        {
            this.type = type;
        }

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

        }

        public void Show()
        {
            Console.WriteLine("--------------------");
            Console.WriteLine("Vehicle Type:" + type);
            Console.WriteLine("Frame:" + parts["frame"]);
            Console.WriteLine("Engine:" + parts["engine"]);
            Console.WriteLine("#Wheels:" + parts["wheels"]);
            Console.WriteLine("#Doors:" + parts["doors"]);
        }
    }

    class Shop
    {
        public void Construct(VehicleBuilder verhicleBuilder)
        {
            verhicleBuilder.BuildFrame();
            verhicleBuilder.BuildEngine();
            verhicleBuilder.BuildWheels();
            verhicleBuilder.BuildDoors();
        }
    }

    abstract class VehicleBuilder
    {
        protected Vehicle vehicle;
        public Vehicle Vehicle 
        {
            get { return vehicle; }
        }

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

    class MotorCycleBuilder : VehicleBuilder
    {
        public override void BuildFrame()
        {
            vehicle = new Vehicle("MotorCycle");
            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 override void BuildFrame()
        {
            vehicle = new Vehicle("Car");
            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 override void BuildFrame()
        {
            vehicle = new Vehicle("Scooter");
            vehicle["frame"] = "Scooter Frame";
        }

        public override void BuildEngine()
        {
            vehicle["engine"] = "none";
        }

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

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

    }

    public class BuilderApp
    {
        public static void Main(string[] args)
        {
            Shop shop = new Shop();
            VehicleBuilder b1 = new ScooterBuilder();
            VehicleBuilder b2 = new CarBuilder();
            VehicleBuilder b3 = new MotorCycleBuilder();

            shop.Construct(b1);
            b1.Vehicle.Show();

            shop.Construct(b2);
            b2.Vehicle.Show();

            shop.Construct(b3);
            b3.Vehicle.Show();
        }
    }

}