the factory pattern

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The Factory Pattern

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Tujuan Pembelajaran• Mengetahui model persoalan yang

menggunakan Simple Factory & Factory Method pattern

• Mengetahui bagaimana menerapkan Simple Factory & Factory Method pattern pada program

• Mampu menerapkan Simple Factory & Factory Method pattern untuk meningkatkan fleksibilitas kode

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Koleksi Desain Pattern• Creational Patterns :– Singleton– Factory

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Persoalan

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Example

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• Program to an interface not an implementation

• You should be open for extension, yet closed for modification

• Identify the aspects that vary and separate them from what stays the same

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SIMPLE FACTORY

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public class PizzaStore { public Pizza orderPizza(String type){

Pizza pizza;

if (type.equals("cheese")){ pizza = new CheesePizza();}else if (type.equals("pepperoni")){ pizza = new PepperoniPizza();}else if (type.equals("greek")){ pizza = new GreekPizza();}

pizza.prepare();pizza.bake();pizza.cut();pizza.box();

return pizza; }}

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public class PizzaStore { public Pizza orderPizza(String type){

Pizza pizza;

pizza.prepare();pizza.bake();pizza.cut();pizza.box();

return pizza; }}

//Keluarkan Kode & Buat objek khusus untuk // membuat Pizza PizzaFactory

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public class SimplePizzaFactory { public Pizza createPizza(String type){

Pizza pizza = null;

if (type.equals("cheese")){ pizza = new CheesePizza();}else if (type.equals("pepperoni")){ pizza = new PepperoniPizza();}else if (type.equals("greek")){ pizza = new GreekPizza();}

return pizza; }}

Buat kelas factory untuk menghasilkan objek Pizza

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public class PizzaStore { SimplePizzaFactory factory;

public PizzaStore(SimplePizzaFactory factory){this.factory = factory;

}

public Pizza orderPizza(String type){Pizza pizza;

pizza = factory.createPizza(type);

pizza.prepare();pizza.bake();pizza.cut();pizza.box();

return pizza; }}

composition

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Class Diagram : Simple FactoryPizza

prepare()bake()cut()box()

SimplePizzaFactory

createPizza()

PizzaStore

orderPizza()

ClamPizza

GreekPizzaPepperoniPizza

CheesePizza

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FACTORY METHOD

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PizzaStore

ChicagoPizzaStore

NYPizzaStore

NYPizzaStore nyFactory = new NYPizzaFactory();PizzaStore nyStore = new PizzaStore(nyFactory);nyStore.order(“cheese”);

ChicacoPizzaStore chicagoFactory = new ChicacoPizzaFactory();PizzaStore chicagoStore = new PizzaStore (chicagoFactory);chicagoStore.order(“cheese”);

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public abstract class PizzaStore {

public Pizza orderPizza(String type){Pizza pizza;

pizza = createPizza(type);

pizza.prepare();pizza.bake();pizza.cut();pizza.box();

return pizza; }

public abstract Pizza createPizza(String type);

}

PizzaStore

ChicagoPizzaStore NYPizzaStore

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public class NYPizzaStore extends PizzaStore {

public Pizza createPizza(String type) { Pizza pizza = null; if (type.equals("cheese")){

pizza = new NYCheesePizza(); } else if (type.equals("pepperoni")){

pizza = new NYPepperoniPizza(); }else if (type.equals("greek")){

pizza = new NYGreekPizza(); }

return pizza; }}

public class ChicagoPizzaStore extends PizzaStore {

public Pizza createPizza(String type) { Pizza pizza = null; if (type.equals("cheese")){

pizza = new ChicagoCheesePizza(); } else if (type.equals("pepperoni")){

pizza = new ChicagoPepperoniPizza(); } else if (type.equals("greek")){

pizza = new ChicagoGreekPizza(); }

return pizza; }}

NYPizzaStore Class

ChicagoPizzaStore Class

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Factory Method

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public class NYCheesePizza extends Pizza { public NYCheesePizza(){

name = "NY Style Sauce and Cheese Pizza";dough = "Thin Crust dough";sauce = "Marinara Sauce";topping = "Grated Reggiano Cheese";

}}

public class NYPepperoniPizza extends Pizza {public NYPepperoniPizza(){

name = "Chicago Style Deep Dish Cheese Pizza";dough = "Extra Thick Crust Dough";sauce = "Plum Tomato Sauce";topping = "Shredded Mozzarella";

}

public void cut (){System.out.println("Cutting the pizza into square slices ");

}}

public class NYGreekPizza extends Pizza {public NYGreekPizza () {

name = "NY Style Greek Pizza";dough = "Thin Crust dough";sauce = "Barbeque Sauce";topping = "Mushroom with Parmesan";

}}

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public class TestPizza {public static void main(String[] args) {

PizzaStore nyStore = new NYPizzaStore();Pizza pizza = nyStore.orderPizza("cheese");

}}

Output :Preparing NY Style Sauce and Cheese PizzaTossing dough ... Adding sauce ... Adding topping ... Grated Reggiano CheeseBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in official PizzaStore box

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All factory patterns encapsulate object creation. The Factory Method Pattern encapsulates object

creation by letting subclasses decide what objects to create.

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The Creator Classes

PizzaStore

ChicagoPizzaStore

NYPizzaStore

The Product Classes

Pizza

NYCheesePizza

NYPepperoniPizza

NYGreekPizza

ChicagoCheesePizza

ChicagoPepperoniPizza

ChicagoGreekPizza

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The Factory Method Pattern defines an interface for creating an object, but lets subclasses decide which

class to instantiate. Factory Method lets a class defer instantiation to subclasses.

Factory Method -- Definisi

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Factory Method – Class Diagram

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• http://www.eelke.com/files/cs330/factory.pdf • Head First Design Pattern

Referensi

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Latihan1. Terapkan Simple Factory pada contoh DuckStore.

public class DuckStore { public void orderDuck(String type){ Duck duck = null; if (type.equals("rubber")){ duck = new RubberDuck(); } else { duck = new DecoyDuck(); } duck.paint(); duck.pack(); } }

public class Test { public static void main(String [] args){ DuckStore store = new DuckStore(); System.out.println("Order RUBBER DUCK"); store.orderDuck("rubber"); System.out.println("Order DECOY DUCK"); store.orderDuck("decoy"); }}

public class Duck { String color; String material; public Duck(String color, String material) { this.color = color; this.material = material; } public void paint(){ System.out.println("Cat bebek dengan warna "+color); } public void pack(){ System.out.println("Masukkan mainan bebek " +material+" ke dalam kotak"); }}

public class RubberDuck extends Duck { public RubberDuck() { super("YELLOW", "PLASTIC"); } }

public class DecoyDuck extends Duck{ public DecoyDuck() { super("BROWN", "WOOD"); } }

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SimpleDuckFactory

createDuck(String type)

DecoyDuck

DecoyDuck()

RubberDuck

RubberDuck()

Duck

Duck(Stringcolor, String material)paint()pack()

String colorString material

DuckStore

DuckStore(SimpleDuckFactory f)orderDuck(String type)

SimpleDuckFactory factory

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2. Ada 2 pabrik pembuat mainan bebek yaitu FactoryA dan FactoryB dimana masing-masing membuat kedua jenis bebek (Rubber dan Decoy). Penjelasan :

Terapkan Factory Method utk skenario di atas.

Tipe Color Material

RubberA ORANGE STANDAR PLASTIC

DecoyA BLACK MERANTI WOOD

RubberB YELLOW PREMIUM PLASTIC

DecoyB BROWN JATI WOOD

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DuckFactory

createDuck(String type)

DecoyDuckADecoyDuck(color, material)

RubberDuckARubberDuck(color, material)

Duck

Duck(Stringcolor, String material)paint()pack()

String colorString material

FactoryA FactoryB

DecoyDuckBDecoyDuck(color, material)

RubberDuckBRubberDuck(color, material)