Design Patterns in OOP PHP - Factory Method

 

Design Patterns in OOP PHP course - Factory Method


factory method
Most popular pattern you Define interface for creating object but let the subclasses decide which class to initiate factory method lets a class defers instantiation to subclasses 

Example 
we want to have two cars brand each one implements the same interface and two other classes that implements factory interface those class are responsible for creating object from 


we will create as following

  1. interface car brand have one method
  2. two brand classes bmwBrand and benzBrand implements car brand
  3. one interface brand factory 
  4. two classes implements the brand factory and will be responsible for creating new object from the two brand classes bmwBrand and benzBrand





 










































carBrandInterface

<?php
namespace Creational\FactoryMethod;

interface CarBrandInterface{

    public function createBrand();

}

?>
BenzBrand class

<?php
namespace Creational\FactoryMethod;

class BenzBrand implements CarBrandInterface{

    public function createBrand(){

        return  "BenzBrand";
    }

}

?>

BmwBrand class
<?php
namespace Creational\FactoryMethod;

class BmwBrand implements CarBrandInterface{

    public function createBrand(){

        return  "BmwBrand";
    }


}

?>

BrandFactory class

<?php
namespace Creational\FactoryMethod;

interface BrandFactory{

    public function BuildBrand();

}

?>
BmwBrandFactory class

<?php
namespace Creational\FactoryMethod;

class BmwBrandFactory implements BrandFactory{
    public function BuildBrand(){
        return new BmwBrand();

    }
}

?>
BenzBrandFactory class
<?php
namespace Creational\FactoryMethod;

class BenzBrandFactory implements BrandFactory{

    public function BuildBrand(){

        return new BenzBrand();
    }
}

?>
test cases

<?php
namespace Tests;
use PHPUnit\Framework\TestCase;

use Creational\FactoryMethod\BmwBrandFactory;
use Creational\FactoryMethod\BmwBrand;

use Creational\FactoryMethod\BenzBrandFactory;
use Creational\FactoryMethod\BenzBrand;
class FactoryMethodClassTest extends TestCase{

    public function testCanCreateBmWCar(){
        $brand=new BmwBrandFactory();
        $BmWCarToBe=$brand->BuildBrand();

        $this->assertInstanceOf(BmwBrand::Class,$BmWCarToBe);

    }
    public function testCanCreateBenzCar(){
        $brand=new BenzBrandFactory();
        $BmWCarToBe=$brand->BuildBrand();

        $this->assertInstanceOf(BenzBrand::Class,$BmWCarToBe);

    }

}
?>
in terminal run
$ ./vendor/bin/phpunit tests/FactoryMethodClassTest

Runtime:       PHP 7.4.28
Configuration: C:\xampp7\htdocs\desginPattern\phpunit.xml

.
.                                                                  2 / 2 (100%)

Time: 93 ms, Memory: 4.00 MB

OK (2 tests, 2 assertions)



sources

https://www.youtube.com/watch?v=LL5MRxpGVGc&list=PLdYYj2XLw5BnpInmR103TyVwFd_CLI6IS&index=5

Comments

Post a Comment

Popular posts from this blog

ES6 : 5 Prevent Object Mutation

As seen in the previous post declaration alone doesn't really protect your data from mutation. To ensure your data doesn't change, JavaScript provides a function Object.freeze() to prevent data mutation. Once the object is frozen, you can no longer add, update, or delete properties from it. Any attempt at changing the object will be rejected without an error. let obj = { name:"FreeCodeCamp" review:"Awesome" }; Object.freeze(obj); obj.review = "bad"; //will be ignored. Mutation not allowed obj.newProp = "Test"; // will be ignored. Mutation not allowed console.log(obj); // { name: "FreeCodeCamp", review:"Awesome"}
Read more

ES6: 1 Explore Differences Between the var and let Keywords

One of the biggest problems with declaring variables with the var keyword is that you can overwrite variable declarations without an error. var camper = 'James'; var camper = 'David'; console.log(camper); // logs 'David' As you can see in the code above, the camper variable is originally declared as James and then overridden to be David . In a small application, you might not run into this type of problem, but when your code becomes larger, you might accidentally overwrite a variable that you did not intend to overwrite. Because this behavior does not throw an error, searching and fixing bugs becomes more difficult. A new keyword called let was introduced in ES6 to solve this potential issue with the var keyword. If you were to replace var with let in the variable declarations of the code above, the result would be an error. let camper = 'James'; let camper = 'David'; // throws an error This error can be seen...
Read more

CSS Grid: Reduce Repetition Using the repeat Function

 When we used grid-template-columns and grid-template-rows to define the structure of a grid, you entered a value for each row or column you created. Lets say you want a grid with 100 rows of the same height. It isn't very practical to insert 100 values individually. Fortunately, there's a better way - by using the repeat function to specify the number of times you want your column or row to be repeated, followed by a comma and the value you want to repeat. Here's an example that would create the 100 row grid, each row at 50px tall. grid-template-rows: repeat(100, 50px); You can also repeat multiple values with the repeat function, and insert the function amongst other values when defining a grid structure. Here's what I mean: grid-template-columns: repeat(2, 1fr 50px) 20px;  this will be translated to :            grid-template-columns:1fr 50px 1fr 50px  20px;   1fr 50px is repeated t...
Read more