Builder Pattern

The Builder Design Pattern is a Creational Design Pattern, It’s build a complex object by using step by step approach and finally step will return the object. The same build process can create different object.

Builder is independent from the objects creation process.

Example:

Consider you are creating mobile product management application. The client want to ask different kind of mobile products like normal & smart phone. First you can construct mobile phone. Mobile phone is the final end product (object). It build different mobile product like Normal & Smart Phone based on many steps like Operating System Installation, Internal Memory Allocation, Allocate Connectivity, Allocate Screen Type and so on…..Finally the whole mobile phone object is returned.

Sample Demo Diagram:

UML Diagram:

Drawbacks:

· It’s requires code duplication as builder need to copy all fields or properties from original

· Requires creating a separate ConcreteBuilder for each different type of product.

· Requires the builder classes to be mutable.

Sample Demo Program:

The following participants are involved in given program

1. Builder – It’s an interface which is used to declare all the steps to create a product

2. ConcreteBuilder – It’s a class which implements or define the Builder interface to create complex kind of product

3. Product – It’s main object that will be constructed

4. Director – It’s used to construct an object using the Builder Interface.

Entire Code Structure:

using System;
namespace BuilderPattern
{
    class Program
    {
        //Identifying various parts with help of enums helper
        public enum OperatingSystem
        {
            Android,
            Symbian_OS,
            Windows_Phone,
            Windows_Mobile,
            Nokia_Asha,
            Aliyun_OS
        }
        public enum Battery
        {
            mAH_2500,
            mAH_4000,
            mAH_4500,
            mAH_5000
        }
        public enum InternalMemory
        {
            IM_250_MB, //Internal Memory 250 MB
            IM_4_GB,
            IM_8_GB,
            IM_16_GB
        }
        public enum Weight
        {
            W_100_g, //Weight 100 grams
            W_146_g,
            W_200_g,
            W_250_g
        }
        public enum WirelessCommunication
        {
            Bluetooth,
            WiFi_Hotspot
        }
        public enum Connectivity
        {
            GSM,
            CDMA,
            LTE,
            TDD
        }
        public enum ScreenType
        {
            Touch,
            Non_Touch
        }
        public enum Colour
        {
            Black,
            Green,
            Yellow,
            White,
            Gold
        }

        //'Product' Class
        class MobilePhone
        {
            public string ModelNumber { get; set; }
            public string PhoneName { get; set; }
            public OperatingSystem OperatingSystem { get; set; }
            public InternalMemory InternalMemory { get; set; }
            public Weight Weight { get; set; }
            public Battery Battery { get; set; }
            public string WirelessCommunication { get; set; }
            public string Connectivity { get; set; }
            public string Camera { get; set; }
            public Colour Colour { get; set; }
            public ScreenType ScreenType { get; set; }

            public void DisplayPhoneDetails()
            {
                Console.WriteLine(string.Format("Model Number : {0}\nPhone Name : {1}\nOperating System : {2}\n"
                    + "Internal Memory : {3}\nWeight : {4}\nBattery : {5}\nWireless Communication : {6}\n"
                    + "Connectivity : {7}\nCamera : {8}\nColour : {9}\nScreen Type : {10}", ModelNumber, PhoneName, OperatingSystem,
                    InternalMemory, Weight, Battery, WirelessCommunication, Connectivity, Camera, Colour, ScreenType));

            }
        }

        //'Builder' Interface
        interface IPhoneBuilder
        {
            void AddOS();
            void AddInternalMemory();
            void AddWeight();
            void AddBattery();
            void AddWirelessCommunication();
            void AddConnectivity();
            void AddCamera();
            void AddColour();
            void AddScreenType();

            MobilePhone GetPhone();
        }

        //'ConcreteBuilder' class - Implements builder interface
        class NormalPhoneBuilder : IPhoneBuilder
        {
            MobilePhone Phone = new MobilePhone();

            public NormalPhoneBuilder(string modelNumber, string phoneName)
            {
                Phone.ModelNumber = modelNumber;
                Phone.PhoneName = phoneName;
            }

            public void AddOS()
            {
                Phone.OperatingSystem = OperatingSystem.Symbian_OS;
            }

            public void AddInternalMemory()
            {
                Phone.InternalMemory = InternalMemory.IM_250_MB;
            }

            public void AddWeight()
            {
                Phone.Weight = Weight.W_100_g;
            }

            public void AddBattery()
            {
                Phone.Battery = Battery.mAH_2500;
            }

            public void AddWirelessCommunication()
            {
                Phone.WirelessCommunication = WirelessCommunication.Bluetooth.ToString();
            }

            public void AddConnectivity()
            {
                Phone.Connectivity = Connectivity.CDMA.ToString();
            }

            public void AddCamera()
            {
                Phone.Camera = "Not Available";
            }

            public void AddColour()
            {
                Phone.Colour = Colour.Black;
            }

            public void AddScreenType()
            {
                Phone.ScreenType = ScreenType.Non_Touch;
            }

            public MobilePhone GetPhone()
            {
                return Phone;
            }
        }

        //'ConcreteBuilder' class - Implements builder interface
        class SmartPhoneBuilder : IPhoneBuilder
        {
            MobilePhone Phone = new MobilePhone();

            public SmartPhoneBuilder(string modelNumber, string phoneName)
            {
                Phone.ModelNumber = modelNumber;
                Phone.PhoneName = phoneName;
            }

            public void AddOS()
            {
                Phone.OperatingSystem = OperatingSystem.Windows_Mobile;
            }

            public void AddInternalMemory()
            {
                Phone.InternalMemory = InternalMemory.IM_8_GB;
            }

            public void AddWeight()
            {
                Phone.Weight = Weight.W_200_g;
            }

            public void AddBattery()
            {
                Phone.Battery = Battery.mAH_4500;
            }

            public void AddWirelessCommunication()
            {
                Phone.WirelessCommunication = string.Format("{0},{1}", WirelessCommunication.Bluetooth.ToString(), WirelessCommunication.WiFi_Hotspot.ToString());
            }

            public void AddConnectivity()
            {
                Phone.Connectivity = string.Format("{0},{1},{2}",Connectivity.CDMA.ToString(), Connectivity.GSM.ToString(), Connectivity.LTE.ToString());
            }

            public void AddCamera()
            {
                Phone.Camera = "13 MP"; //13 Mega Pixcel
            }

            public void AddColour()
            {
                Phone.Colour = Colour.Gold;
            }

            public void AddScreenType()
            {
                Phone.ScreenType = ScreenType.Touch;
            }

            public MobilePhone GetPhone()
            {
                return Phone;
            }
        }

        //'Director' class - To constract mobile phone
        class MobilePhoneManufacturer
        {
            public void BuildMobilePhone(IPhoneBuilder phoneBuilder)
            {
                phoneBuilder.AddOS();
                phoneBuilder.AddInternalMemory();
                phoneBuilder.AddWeight();
                phoneBuilder.AddBattery();
                phoneBuilder.AddWirelessCommunication();
                phoneBuilder.AddConnectivity();
                phoneBuilder.AddConnectivity();
                phoneBuilder.AddCamera();
                phoneBuilder.AddColour();
                phoneBuilder.AddScreenType();
            }
        }

        static void Main(string[] args)
        {
            //Create 'Director'
            MobilePhoneManufacturer mobilePhoneManufacturer = new MobilePhoneManufacturer();

            //Build Normal Mobile Phone
            IPhoneBuilder normalPhoneBuilder = new NormalPhoneBuilder("Normal_001", "Nokia 1600");
            mobilePhoneManufacturer.BuildMobilePhone(normalPhoneBuilder);
            MobilePhone NormalMobilePhone = normalPhoneBuilder.GetPhone();

            //Display Details
            Console.WriteLine("----------------------Normal Mobile Phone Details-----------------");
            NormalMobilePhone.DisplayPhoneDetails();

            //Build Smart Phone
            Console.WriteLine("\n----------------------Smart Phone Details-----------------");
            IPhoneBuilder smartPhoneBuilder = new SmartPhoneBuilder("SmartPhone_001", "Nokia Asha");
            mobilePhoneManufacturer.BuildMobilePhone(smartPhoneBuilder);
            MobilePhone SmartPhone = smartPhoneBuilder.GetPhone();

            //Display Details
            SmartPhone.DisplayPhoneDetails();

            Console.Write("Press any key to exist...");

            Console.ReadKey();

        }
    }
}

Final Output:

Click here to download sample program

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Software Development Tricky

Software Development Tricky

Monday 25 September 2017

Builder Pattern

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