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C#:Abstract Factory Pattern

By , 18 Jun 2007
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Introduction

Design patterns make it easier to reuse successful designs and architectures.
Design patterns help you choose design alternatives that make a system reusable and avoid alternatives that compromise reusability.
An abstract factory provides an interface for creating families of related objects without specifying their concrete classes

The Abstract Factory pattern let's us group like factory classes together. In the example below we group a factory for creating Indian Bread and a factory for creating American bread together and then we decide what "kind of" bread to create based on the information which we will get at run time.

Using the code

And below there is an implementation in C#:

//Let's define type of bread bases
public enum BreadBase
{
     HotIndianMasalaBase,
     PunjabiTadkaBase,
     ItalianCheeseBase,
     VeggieBase,
}
//This is a breadfactory where people visit to get their favorite bread bases
public interface BreadFactory
{
    Bread GetBread(BreadBase BreadBase);
}

//The abstract bread
public interface Bread
{
    void Bake();
}

//create concrete classes

public class HotIndianMasalaBread :Bread
{
    public void Bake()
    {
        Console.WriteLine ("For you::Hotindian Masala base Bread.");
    }
}
public class VeggieBread : Bread
{
    public void Bake()
    {
        Console.WriteLine("For you::Veggie base Bread.");
    }
}

public class ItalianCheeseBread : Bread
{
    public void Bake()
    {
        Console.WriteLine("For you::Italian cheese base Bread.");
    }
}
public class PunjabiTadkaBaseBread : Bread
{
    public void Bake()
    {
        Console.WriteLine("For you::Punjabi tadka base bread.");
    }
}
//Lets create bread factories aka concrete classes

public class AmericanBreadFactory :BreadFactory
{
    public Bread GetBread(BreadBase BreadBase)
    {
        Bread vBread = null;
        switch (BreadBase)
        {
            case BreadBase.VeggieBase:
                vBread = new VeggieBread();
                break;
            case BreadBase.ItalianCheeseBase:
                vBread = new ItalianCheeseBread();
                break;
        }
        return vBread;
    }
}

public class IndianBreadFactory :BreadFactory
{
    public Bread GetBread(BreadBase BreadBase)
    {
        Bread vBread = null;
        switch (BreadBase)
        {
            case BreadBase.HotIndianMasalaBase:
                vBread = new HotIndianMasalaBread();
                break;
            case BreadBase.PunjabiTadkaBase:
                vBread = new PunjabiTadkaBaseBread();
                break;
        }
        return vBread;
    }
}

//lets order breads

class Program
{
    static void Main(string[] args)
    {
    //example of abstract factory
    AmericanBreadFactory vAmericanBread = new AmericanBreadFactory();
    Bread vBread = vAmericanBread.GetBread(BreadBase.VeggieBase);
    vBread.Bake();

    //lets bak indian punjabi tadka bread
    IndianBreadFactory vIndianBreadFactory = new IndianBreadFactory();
    Bread vIndianBread = vIndianBreadFactory.GetBread(BreadBase.PunjabiTadkaBase);
    vIndianBread.Bake();
    }
} 
//Himachalsoft.com:: my website

License

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

About the Author

PrashantRishu
Web Developer
India India
ASP.NET developer working in India.

Comments and Discussions

 
GeneralNice! PinmemberNAGG21-Jan-09 11:10 
Good work Big Grin | :-D

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