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Factory Method Pattern

16 Temmuz 2010, 12:08

Factory method pattern factory objelerini implement eden desing pattern lardır. Elimizde class olmadan o class a ait objelerin oluşturulmasını sağlar.

 

UML :

 

factory

 

 

Örnek :

 

Java

 

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abstract class Pizza {
    public abstract int getPrice(); // count the cents
}
 
class HamAndMushroomPizza extends Pizza {
    public int getPrice() {
        return 850;
    }
}
 
class DeluxePizza extends Pizza {
    public int getPrice() {
        return 1050;
    }
}
 
class HawaiianPizza extends Pizza {
    public int getPrice() {
        return 1150;
    }
}
 
class PizzaFactory {
    public enum PizzaType {
        HamMushroom,
        Deluxe,
        Hawaiian
    }
 
    public static Pizza createPizza(PizzaType pizzaType) {
        switch (pizzaType) {
            case HamMushroom:
                return new HamAndMushroomPizza();
            case Deluxe:
                return new DeluxePizza();
            case Hawaiian:
                return new HawaiianPizza();
        }
        throw new IllegalArgumentException("The pizza type " + pizzaType + " is not recognized.");
    }
}
 
class PizzaLover {
    /*
     * Create all available pizzas and print their prices
     */
    public static void main (String args[]) {
        for (PizzaFactory.PizzaType pizzaType : PizzaFactory.PizzaType.values()) {
            System.out.println("Price of " + pizzaType + " is " + PizzaFactory.createPizza(pizzaType).getPrice());
        }
    }
}

Output:
Price of HamMushroom is 850
Price of Deluxe is 1050
Price of Hawaiian is 1150

 

 

Php

 

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<?php
 
abstract class Pizza
{
    protected $_price;
    public function getPrice()
    {
        return $this->_price;
    }
}
 
class HamAndMushroomPizza extends Pizza
{
    protected $_price = 8.5;
}
 
class DeluxePizza extends Pizza
{
    protected $_price = 10.5;
}
 
class HawaiianPizza extends Pizza
{
    protected $_price = 11.5;
}
 
class PizzaFactory
{
    public static function createPizza($type)
    {
        $baseClass = 'Pizza';
        $targetClass = ucfirst($type).$baseClass;
 
        if (class_exists($targetClass) && is_subclass_of($targetClass, $baseClass))
            return new $targetClass;
        else
            throw new Exception("The pizza type '$type' is not recognized.");
    }
}
 
$pizzas = array('HamAndMushroom','Deluxe','Hawaiian');
foreach($pizzas as $p) {
    printf(
        "Price of %s is %01.2f".PHP_EOL ,
        $p ,
        PizzaFactory::createPizza($p)->getPrice()
    );
}
 
 
// Output:
// Price of HamAndMushroom is 8.50
// Price of Deluxe is 10.50
// Price of Hawaiian is 11.50
 
?>

 

 

Kaynak: wikipedia

Category: Design Patterns, Java, Php  |  Yorum (RSS)  |  Geri İzleme

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