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An example of Prototype pattern

, 7 Feb 2011
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An example of Prototype pattern
The Prototype pattern creates new objects by cloning one of a few stored prototypes.
 
I desided to apply this pattern for a small application to sell different devices.
 
internal abstract class DevicePrototype
    {
        public abstract DevicePrototype Clone();
    }
 
This class defines the interface that says prototypes must be cloneable. Now we need to create a class with cloning capabilities. In our situation it'll be class represented some device:
 
internal class Device: DevicePrototype
    {
        public Guid Guid { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
        public string Owner { get; set; }
        public override DevicePrototype Clone()
        {
            Console.WriteLine("Cloning device - Name: {0}, Price: {1}",
                Name, Price);
            return MemberwiseClone() as DevicePrototype;
        }
        public override string ToString()
        {
            return string.Format("Guid:{0}\nName:{1}\nPrice{2}\nOwner{3}\n\n",
                Guid, Name, Price, Owner);
        }
    }
 
Then we'll create prototype maneger. In our case we'll use this manager as shop to store devices for selling.
 
internal class DeviceManager
    {
        private Hashtable devices=new Hashtable();
 
        public DevicePrototype this[string name]
        {
            get
            {
                return devices.ContainsKey(name)
                           ? devices[name] as DevicePrototype
                           : null;
            }
 
            set
            {
                devices.Add(name, value);
            }
        }
    }
 
And now is the time to play with created classes to demonstrate how we use Prototype pattern:
 
class Program
    {
        static void Main(string[] args)
        {
            //Creates A SHOP / an instance of manager
            var shop = new DeviceManager();
            //Creates a list to store sold devices
            var devices = new List<Device>();
            //Fills product list in the shop with products
            shop["iPhone"] = new Device {Guid = Guid.Empty, 
          Name = "iPhone", Price = 1000};
            shop["iPad"] = new Device {Guid = Guid.Empty, 
          Name = "iPad", Price = 1200};
            //Simulates e-commerce process
            var iPhoneForDavid = shop["iPhone"].Clone() as Device;
            iPhoneForDavid.Guid = Guid.NewGuid();
            iPhoneForDavid.Owner = "David";
            devices.Add(iPhoneForDavid);
            var iPhoneForSara = shop["iPhone"].Clone() as Device;
            iPhoneForSara.Guid = Guid.NewGuid();
            iPhoneForSara.Owner = "Sara";
            devices.Add(iPhoneForSara);
            var iPodForSara = shop["iPad"].Clone() as Device;
            iPodForSara.Guid = Guid.NewGuid();
            iPodForSara.Owner = "Sara";
            devices.Add(iPodForSara);
            //Let's show some results
            Console.WriteLine("\n\n\nShow all iPhones");
            Console.WriteLine("----------------------------");
            var iPhones = devices.Where(d => d.Name == "iPhone");
            foreach (var iPhone in iPhones)
            {
                Console.Write(iPhone);
            }
        }
    }

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Pavel Yermalovich
Software Developer (Senior)
Belarus Belarus
Software developer with over 3 years of extensive experience in analysis, design and development. Recently, most interested in refactoring and design patterns applied to .NET Framework.
 
Core technologies I am using: OOP, OOD, DDD, TDD, N-tier applications, enterprise development.
 
Certificates:
Brainbench: .NET Framework 3.5 Fundamentals, Data Modeling Concepts, Web Design Concepts, C#
 
Microsoft: Exam 70-526: TS: Microsoft .NET Framework 2.0 - Windows-Based Client Development
 
INTUIT.RU: Development of Web-application ASP. NET Using Visual Studio. NET, Web applications in ASP.NET, Microsoft .NET Framework Distributed Applications Development.
 
Specialties
NET Framework : 2.0, 3.5, 4.0
Languages and technologies: C#, ASP.NET MVC 2, ASP.NET MVC 3, WCF, ASP.NET 4.0, Web Services, ADO.NET, LINQ, Entity Framework, NHibernate 3.0, JavaScript, HTML, CSS, XML, Ajax
RDBMS : SQL Server 2005, 2008, 2008 R2, MS Access.
Reporting: MS SQL Reporting Services, Crystal Reports

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