Строител (Builder) е създаващ шаблон за дизайн, който се използва в обектно-ориентираното програмиране.

Целта е да се раздели създаването на сложен обект от неговото представяне (интерфейс), за да може с един и същ процес да се създават обекти с различно представяне.

Примери C++ // Реализация на C++.

#include <iostream> #include <memory> #include <string>

// Product class Pizza { private: std::string dough; std::string sauce; std::string topping;

public: Pizza() { } ~Pizza() { }

void SetDough(const std::string& d) { dough = d; }; void SetSauce(const std::string& s) { sauce = s; }; void SetTopping(const std::string& t) { topping = t; }

void ShowPizza() { std::cout << " Yummy !!!" << std::endl << "Pizza with Dough as " << dough << ", Sauce as " << sauce << " and Topping as " << topping << " !!! " << std::endl;

// Abstract Builder class PizzaBuilder { protected: std::auto_ptr<Pizza> pizza; public: PizzaBuilder() {} virtual ~PizzaBuilder() {} std::auto_ptr<Pizza> GetPizza() { return pizza; }

void createNewPizzaProduct() { pizza.reset (new Pizza); }

virtual void buildDough()=0; virtual void buildSauce()=0; virtual void buildTopping()=0;

// ConcreteBuilder class HawaiianPizzaBuilder : public PizzaBuilder { public: HawaiianPizzaBuilder() : PizzaBuilder() {} ~HawaiianPizzaBuilder(){}

void buildDough() { pizza->SetDough("cross"); } void buildSauce() { pizza->SetSauce("mild"); } void buildTopping() { pizza->SetTopping("ham and pineapple"); }

// ConcreteBuilder class SpicyPizzaBuilder : public PizzaBuilder { public: SpicyPizzaBuilder() : PizzaBuilder() {} ~SpicyPizzaBuilder() {}

void buildDough() { pizza->SetDough("pan baked"); } void buildSauce() { pizza->SetSauce("hot"); } void buildTopping() { pizza->SetTopping("pepperoni and salami"); }

// Director class Waiter { private: PizzaBuilder* pizzaBuilder; public: Waiter() : pizzaBuilder(NULL) {} ~Waiter() { }

void SetPizzaBuilder(PizzaBuilder* b) { pizzaBuilder = b; } std::auto_ptr<Pizza> GetPizza() { return pizzaBuilder->GetPizza(); } void ConstructPizza() { pizzaBuilder->createNewPizzaProduct(); pizzaBuilder->buildDough(); pizzaBuilder->buildSauce(); pizzaBuilder->buildTopping();

// Клиент поръчва 2 пици int main() { Waiter waiter;

HawaiianPizzaBuilder hawaiianPizzaBuilder; waiter.SetPizzaBuilder (&hawaiianPizzaBuilder); waiter.ConstructPizza(); std::auto_ptr<Pizza> pizza = waiter.GetPizza(); pizza->ShowPizza();

SpicyPizzaBuilder spicyPizzaBuilder; waiter.SetPizzaBuilder(&spicyPizzaBuilder); waiter.ConstructPizza(); pizza = waiter.GetPizza(); pizza->ShowPizza();

return EXIT_SUCCESS; }

C# using System; using System.Collections;

namespace Builder

public class MainApp { public static void Main() { // Create director and builders Director director = new Director();

Builder b1 = new ConcreteBuilder1(); Builder b2 = new ConcreteBuilder2();

// Construct two products director.Construct(b1); Product p1 = b1.GetResult(); p1.Show();

director.Construct(b2); Product p2 = b2.GetResult(); p2.Show();

// Wait for user Console.Read();

// "Director"

class Director { // Builder uses a complex series of steps public void Construct(Builder builder) { builder.BuildPartA(); builder.BuildPartB();

// "Builder"

abstract class Builder { public abstract void BuildPartA(); public abstract void BuildPartB(); public abstract Product GetResult();

// "ConcreteBuilder1"

class ConcreteBuilder1 : Builder { private readonly Product product = new Product();

public override void BuildPartA() { product.Add("PartA");

public override void BuildPartB() { product.Add("PartB");

public override Product GetResult() { return product;

// "ConcreteBuilder2"

class ConcreteBuilder2 : Builder { private readonly Product product = new Product();

public override void BuildPartA() { product.Add("PartX");

public override void BuildPartB() { product.Add("PartY");

public override Product GetResult() { return product;

// "Product"

class Product { private readonly ArrayList parts = new ArrayList();

public void Add(string part) { parts.Add(part);

public void Show() { Console.WriteLine("\nProduct Parts -------"); foreach (string part in parts) Console.WriteLine(part);

Java /** "Product" */ class Pizza { private String dough = ""; private String sauce = ""; private String topping = "";

public void setDough(String dough) { this.dough = dough; } public void setSauce(String sauce) { this.sauce = sauce; } public void setTopping(String topping) { this.topping = topping; }

/** "Abstract Builder" */ abstract class PizzaBuilder { protected Pizza pizza;

public Pizza getPizza() { return pizza; } public void createNewPizzaProduct() { pizza = new Pizza(); }

public abstract void buildDough(); public abstract void buildSauce(); public abstract void buildTopping();

/** "ConcreteBuilder" */ class HawaiianPizzaBuilder extends PizzaBuilder { public void buildDough() { pizza.setDough("cross"); } public void buildSauce() { pizza.setSauce("mild"); } public void buildTopping() { pizza.setTopping("ham+pineapple"); }

/** "ConcreteBuilder" */ class SpicyPizzaBuilder extends PizzaBuilder { public void buildDough() { pizza.setDough("pan baked"); } public void buildSauce() { pizza.setSauce("hot"); } public void buildTopping() { pizza.setTopping("pepperoni+salami"); }

/** "Director" */ class Waiter { private PizzaBuilder pizzaBuilder;

public void setPizzaBuilder(PizzaBuilder pb) { pizzaBuilder = pb; } public Pizza getPizza() { return pizzaBuilder.getPizza(); }

public void constructPizza() { pizzaBuilder.createNewPizzaProduct(); pizzaBuilder.buildDough(); pizzaBuilder.buildSauce(); pizzaBuilder.buildTopping();

/** Клиент поръчва пица. */ class BuilderExample { public static void main(String[] args) { Waiter waiter = new Waiter(); PizzaBuilder hawaiian_pizzabuilder = new HawaiianPizzaBuilder(); PizzaBuilder spicy_pizzabuilder = new SpicyPizzaBuilder();

waiter.setPizzaBuilder(hawaiian_pizzabuilder); waiter.constructPizza();

Pizza pizza = waiter.getPizza();

PHP /* Produit */ class Pizza { private $_pate = ""; private $_sauce = ""; private $_garniture = "";

public function setPate($pate) { $this->_pate = $pate; } public function setSauce($sauce) { $this->_sauce = $sauce; } public function setGarniture($garniture) { $this->_garniture = $garniture; } }

/* Monteur */ abstract class MonteurPizza { protected $_pizza;

public function getPizza() { return $this->_pizza; } public function creerNouvellePizza() { $this->_pizza = new Pizza(); }

abstract public function monterPate(); abstract public function monterSauce(); abstract public function monterGarniture(); }

/* MonteurConcret */ class MonteurPizzaHawaii extends MonteurPizza { public function monterPate() { $this->_pizza.setPate("croisée"); } public function monterSauce() { $this->_pizza.setSauce("douce"); } public function monterGarniture() { $this->_pizza.setGarniture("jambon+ananas"); } }

/* MonteurConcret */ class MonteurPizzaPiquante extends MonteurPizza { public function monterPate() { $this->_pizza.setPate("feuilletée"); } public function monterSauce() { $this->_pizza.setSauce("piquante"); } public function monterGarniture() { $this->_pizza.setGarniture("pepperoni+salami"); } }

/* Directeur */ class Serveur { private $_monteurPizza;

public function setMonteurPizza(MonteurPizza $mp) { $this->_monteurPizza = $mp; } public function getPizza() { return $this->_monteurPizza->getPizza(); }

public void construirePizza() { $this->_monteurPizza->creerNouvellePizza(); $this->_monteurPizza->monterPate(); $this->_monteurPizza->monterSauce(); $this->_monteurPizza->monterGarniture();

/* Клиент поръчва пица. */ $serveur = new Serveur(); $monteurPizzaHawaii = new MonteurPizzaHawaii(); $monteurPizzaPiquante = new MonteurPizzaPiquante();

$serveur->setMonteurPizza($monteurPizzaHawaii); $serveur->construirePizza();

$pizza = $serveur->getPizza();

Категория:Шаблони за софтуерен дизайн