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New Message on BDOTNET
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From: LovedJohnySmith
Message 2 in Discussion
Builder Pattern is quite confusing.
There is a very subtle difference between Builder Pattern and Factory Pattern.
I am not discussing Factory Pattern in this article but will soon write
about Factory Pattern as well.
In Builder Pattern the user is given the
choice to create the type of object he wants but the construction process
is the same.
We consider an example suppose you went
to buy a car. First you will choose the model of the car and then it's
color and you consider it's price that whether it's feasible for you or
not and if you want some extra luxuries in the car you will note them down
as well and in the end you will place the order. Now you are isolated with
the manufacturing process. You are not bothered by the manufacturing process
it's the duty of the company because they have the assembly plant, which
is programmed to manufacture cars of the model you choose and the manufacturing
process is same for a specified model of car.
In Builder the client instructs the builder
class on how to create the object and then asks it for the result. How
the class is put together is up to the Builder class
The Object Constructed according to user Selection
C# Implementation
IBuilder Interface
using System;
using System.Windows.Forms;
namespace BuilderPattern
{
///
/// Summary description for IBuilder.
///
public interface IBuilder
{
void
MnaufactureCar();
}
}
Classes that extends from IBuilder interface
1)
SuzukiMehran Class
using System;
using System.Windows.Forms;
namespace BuilderPattern
{
///
/// Summary description for SuzukiMehran.
///
public class SuzukiMehran:IBuilder
{
public
void MnaufactureCar()
{
MessageBox.Show("Suzuki Mehran
Model 2002 "
+"Color Balck
"
+ "Air Conditioned
" );
}
}
}
2) SuzukiKhyber Class
using System;
using System.Windows.Forms;
namespace BuilderPattern
{
///
/// Summary description for SuzukiKhyber.
///
public class SuzukiKhyber:IBuilder
{
public
SuzukiKhyber()
{
}
public
void MnaufactureCar()
{
MessageBox.Show("Suzuki Khyber Model 2002 Standard "
+"Color
Red "
+"Air
Conditioned "
+"Alloy
Rim ");
}
}
}
Director class
using System;
namespace BuilderPattern
{
///
/// Summary description for Director.
///
public class Director
{
public
void ConstructCar(IBuilder build)
{
build.MnaufactureCar();
}
}
}
Client Class
private void button1_Click(object sender, System.EventArgs e)
{
if(cmbChooseCar.Text=="Suzuki Mehran")
{
Director car=new
Director();
IBuilder build=new
SuzukiMehran();
car.ConstructCar(build);
}
if(cmbChooseCar.Text=="Suzuki Khyber")
{
Director
car=new Director();
IBuilder
build=new SuzukiKhyber();
car.ConstructCar(build);
}
}
Description of program
The above program contains an interface
IBuilder which declare one function ManufactureCar. Two classes SuzukiMehran
and SuzukiKhyber implement this interface IBuilder and also implements
the interface function ManufactureCar. Now we have a Director class which
contains a method Constructcar which accepts an argument of type IBuilder
and then call Manufacturecar method of any one Class depending upon the
reference type variable build that which type of object of its child class
it is pointing. The Client class just decides what type of object to create
either SuzukiMehran or SuzukiKhyber and then pass this object as an argument
to director method ManufactureCar
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