factory method

factorymethod/README.md

@@ -2,6 +2,8 @@
 
 Порождающий паттерн проектирования, который определяет общий интерфейс для создания объектов в суперклассе, позволяя подклассам изменять тип создаваемых объектов.
 
+Паттерн **Фабричный Метод** определяет интерфейс создания объекта, но позволяет субклассам выбрать создаваемый экземпляр. Таким образом, Фабричный Метод делегирует операцию создания экземпляра субклассам.
+
 ## Принципы
 
 - По возможности использовать абстракции в коде

factorymethod/pizzafactorymethod/app.d

@@ -0,0 +1,37 @@
+module factorymethod.pizzafactorymethod.app;
+
+import factorymethod.pizzafactorymethod.pizza;
+import factorymethod.pizzafactorymethod.pizzastore;
+import factorymethod.pizzafactorymethod.nypizzastore;
+import factorymethod.pizzafactorymethod.chicagopizzastore;
+import std.stdio : writeln;
+
+void main()
+{
+    PizzaStore nyStore = new NYPizzaStore();
+    PizzaStore chicagoStore = new ChicagoPizzaStore();
+
+    Pizza pizza = nyStore.orderPizza("cheese");
+    writeln("Ethan ordered a ", pizza.getName());
+
+    pizza = chicagoStore.orderPizza("cheese");
+    writeln("Joel ordered a ", pizza.getName());
+
+    pizza = nyStore.orderPizza("clam");
+    writeln("Ethan ordered a ", pizza.getName());
+
+    pizza = chicagoStore.orderPizza("clam");
+    writeln("Joel ordered a ", pizza.getName());
+
+    pizza = nyStore.orderPizza("pepperoni");
+    writeln("Ethan ordered a ", pizza.getName());
+
+    pizza = chicagoStore.orderPizza("pepperoni");
+    writeln("Joel ordered a ", pizza.getName());
+
+    pizza = nyStore.orderPizza("veggie");
+    writeln("Ethan ordered a ", pizza.getName());
+
+    pizza = chicagoStore.orderPizza("veggie");
+    writeln("Joel ordered a ", pizza.getName());
+}

factorymethod/pizzafactorymethod/chicagopizzastore.d

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+module factorymethod.pizzafactorymethod.chicagopizzastore;
+
+import factorymethod.pizzafactorymethod.pizza;
+import factorymethod.pizzafactorymethod.pizzastore;
+import factorymethod.pizzafactorymethod.chicagostylecheesepizza;
+import factorymethod.pizzafactorymethod.chicagostyleclampizza;
+import factorymethod.pizzafactorymethod.chicagostylepepperonipizza;
+import factorymethod.pizzafactorymethod.chicagostyleveggiepizza;
+
+class ChicagoPizzaStore : PizzaStore
+{
+	override Pizza createPizza(string item)
+    {
+		if (item == "cheese")
+        {
+			return new ChicagoStyleCheesePizza();
+		}
+        else if (item == "veggie")
+        {
+			return new ChicagoStyleVeggiePizza();
+		}
+        else if (item == "clam")
+        {
+			return new ChicagoStyleClamPizza();
+		}
+        else if (item == "pepperoni")
+        {
+			return new ChicagoStylePepperoniPizza();
+		}
+        else
+        {
+            return null;
+        }
+	}
+}

factorymethod/pizzafactorymethod/chicagostylecheesepizza.d

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+module factorymethod.pizzafactorymethod.chicagostylecheesepizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+import std.stdio : writeln;
+
+class ChicagoStyleCheesePizza : Pizza
+{
+    this()
+    { 
+        name = "Chicago Style Deep Dish Cheese Pizza";
+        dough = "Extra Thick Crust Dough";
+        sauce = "Plum Tomato Sauce";
+ 
+        toppings ~= "Shredded Mozzarella Cheese";
+    }
+ 
+    override void cut()
+    {
+        writeln("Cutting the pizza into square slices");
+    }
+}

factorymethod/pizzafactorymethod/chicagostyleclampizza.d

@@ -0,0 +1,22 @@
+module factorymethod.pizzafactorymethod.chicagostyleclampizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+import std.stdio : writeln;
+
+class ChicagoStyleClamPizza : Pizza
+{
+    this()
+    { 
+        name = "Chicago Style Clam Pizza";
+        dough = "Extra Thick Crust Dough";
+        sauce = "Plum Tomato Sauce";
+ 
+        toppings ~= "Shredded Mozzarella Cheese";
+        toppings ~= "Frozen Clams from Chesapeake Bay";
+    }
+ 
+    override void cut()
+    {
+        writeln("Cutting the pizza into square slices");
+    }
+}

factorymethod/pizzafactorymethod/chicagostylepepperonipizza.d

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+module factorymethod.pizzafactorymethod.chicagostylepepperonipizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+import std.stdio : writeln;
+
+class ChicagoStylePepperoniPizza : Pizza
+{
+    this()
+    { 
+        name = "Chicago Style Pepperoni Pizza";
+        dough = "Extra Thick Crust Dough";
+        sauce = "Plum Tomato Sauce";
+ 
+        toppings ~= "Shredded Mozzarella Cheese";
+        toppings ~= "Black Olives";
+        toppings ~= "Spinach";
+        toppings ~= "Eggplant";
+        toppings ~= "Sliced Pepperoni";
+    }
+ 
+    override void cut()
+    {
+        writeln("Cutting the pizza into square slices");
+    }
+}

factorymethod/pizzafactorymethod/chicagostyleveggiepizza.d

@@ -0,0 +1,24 @@
+module factorymethod.pizzafactorymethod.chicagostyleveggiepizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+import std.stdio : writeln;
+
+class ChicagoStyleVeggiePizza : Pizza
+{
+    this()
+    { 
+        name = "Chicago Deep Dish Veggie Pizza";
+        dough = "Extra Thick Crust Dough";
+        sauce = "Plum Tomato Sauce";
+ 
+        toppings ~= "Shredded Mozzarella Cheese";
+        toppings ~= "Black Olives";
+        toppings ~= "Spinach";
+        toppings ~= "Eggplant";
+    }
+ 
+    override void cut()
+    {
+        writeln("Cutting the pizza into square slices");
+    }
+}

factorymethod/pizzafactorymethod/nypizzastore.d

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+module factorymethod.pizzafactorymethod.nypizzastore;
+
+import factorymethod.pizzafactorymethod.pizza;
+import factorymethod.pizzafactorymethod.pizzastore;
+import factorymethod.pizzafactorymethod.nystylecheesepizza;
+import factorymethod.pizzafactorymethod.nystyleclampizza;
+import factorymethod.pizzafactorymethod.nystylepepperonipizza;
+import factorymethod.pizzafactorymethod.nystyleveggiepizza;
+
+class NYPizzaStore : PizzaStore
+{
+	override Pizza createPizza(string item)
+    {
+		if (item == "cheese")
+        {
+			return new NYStyleCheesePizza();
+		}
+        else if (item == "veggie")
+        {
+			return new NYStyleVeggiePizza();
+		}
+        else if (item == "clam")
+        {
+			return new NYStyleClamPizza();
+		}
+        else if (item == "pepperoni")
+        {
+			return new NYStylePepperoniPizza();
+		}
+        else
+        {
+            return null;
+        }
+	}
+}

factorymethod/pizzafactorymethod/nystylecheesepizza.d

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+module factorymethod.pizzafactorymethod.nystylecheesepizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+
+class NYStyleCheesePizza : Pizza
+{
+    this()
+    { 
+        name = "NY Style Sauce and Cheese Pizza";
+        dough = "Thin Crust Dough";
+        sauce = "Marinara Sauce";
+ 
+        toppings ~= "Grated Reggiano Cheese";
+    }
+}

factorymethod/pizzafactorymethod/nystyleclampizza.d

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+module factorymethod.pizzafactorymethod.nystyleclampizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+
+class NYStyleClamPizza : Pizza
+{
+    this()
+    { 
+        name = "NY Style Clam Pizza";
+        dough = "Thin Crust Dough";
+        sauce = "Marinara Sauce";
+ 
+        toppings ~= "Grated Reggiano Cheese";
+        toppings ~= "Fresh Clams from Long Island Sound";
+    }
+}

factorymethod/pizzafactorymethod/nystylepepperonipizza.d

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+module factorymethod.pizzafactorymethod.nystylepepperonipizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+
+class NYStylePepperoniPizza : Pizza
+{
+    this()
+    { 
+        name = "NY Style Pepperoni Pizza";
+        dough = "Thin Crust Dough";
+        sauce = "Marinara Sauce";
+ 
+        toppings ~= "Grated Reggiano Cheese";
+        toppings ~= "Sliced Pepperoni";
+        toppings ~= "Garlic";
+		toppings ~= "Onion";
+		toppings ~= "Mushrooms";
+		toppings ~= "Red Pepper";
+    }
+}

factorymethod/pizzafactorymethod/nystyleveggiepizza.d

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+module factorymethod.pizzafactorymethod.nystyleveggiepizza;
+
+import factorymethod.pizzafactorymethod.pizza;
+
+class NYStyleVeggiePizza : Pizza
+{
+    this()
+    { 
+        name = "NY Style Veggie Pizza";
+        dough = "Thin Crust Dough";
+        sauce = "Marinara Sauce";
+ 
+        toppings ~= "Grated Reggiano Cheese";
+        toppings ~= "Garlic";
+		toppings ~= "Onion";
+		toppings ~= "Mushrooms";
+		toppings ~= "Red Pepper";
+    }
+}

factorymethod/pizzafactorymethod/pizza.d

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+module factorymethod.pizzafactorymethod.pizza;
+
+import std.stdio : writeln;
+
+abstract class Pizza
+{
+protected:
+    string name;
+    string dough;
+    string sauce;
+    string[] toppings;
+public:
+    string getName()
+    {
+        return name;
+    }
+
+    void prepare()
+    {
+        writeln("Prepare " ~ name);
+        writeln("Tossing dough...");
+        writeln("Adding sauce...");
+        writeln("Adding toppings: ");
+        foreach (val; toppings)
+        {
+            writeln("   " ~ val);
+        }
+    }
+
+    void bake()
+    {
+        writeln("Bake for 25 minutes at 350");
+    }
+
+    void cut()
+    {
+        writeln("Cut the pizza into diagonal slices");
+    }
+
+    void box()
+    {
+        writeln("Place pizza in official PizzaStore box");
+    }
+
+    override string toString() const @safe pure nothrow
+    {
+        string s;
+        s ~= "---- " ~ name ~ " ----\n";
+        s ~= dough ~ "\n";
+        s ~= sauce ~ "\n";
+        foreach (val; toppings)
+        {
+            s ~= val ~ '\n';
+        }
+        return s;
+    }
+}

factorymethod/pizzafactorymethod/pizzastore.d

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+module factorymethod.pizzafactorymethod.pizzastore;
+
+import factorymethod.pizzafactorymethod.pizza;
+import std.stdio : writeln;
+
+class PizzaStore
+{
+    abstract Pizza createPizza(string type);
+
+    Pizza orderPizza(string type)
+    {
+        Pizza pizza = createPizza(type);
+
+        writeln("--- Making a " ~ pizza.getName() ~ " ---");
+
+        pizza.prepare();
+        pizza.bake();
+        pizza.cut();
+        pizza.box();
+
+        return pizza;
+    }
+}