state gummball winner

.gitignore

@@ -0,0 +1,2 @@
+app
+app.o

README.md

@@ -1,3 +1,39 @@
-# Паттерны проектирования
+# Паттерны проектирования на языке D
 
-Паттерны проектирования на различных языках программирования по книге [Head First. Паттерны проектирования](https://ftp.zhirov.kz/books/IT/%D0%9F%D0%B0%D1%82%D1%82%D0%B5%D1%80%D0%BD%D1%8B/Head%20First.%20%D0%9F%D0%B0%D1%82%D1%82%D0%B5%D1%80%D0%BD%D1%8B%20%D0%BF%D1%80%D0%BE%D0%B5%D0%BA%D1%82%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F%20%28%D0%AD%D1%80%D0%B8%D0%BA%20%D0%A4%D1%80%D0%B8%D0%BC%D0%B5%D0%BD%2C%20%D0%AD%D0%BB%D0%B8%D0%B7%D0%B0%D0%B1%D0%B5%D1%82%20%D0%A0%D0%BE%D0%B1%D1%81%D0%BE%D0%BD%29%202022.pdf)
+Паттерны проектирования по книге [Head First. Паттерны проектирования](https://ftp.zhirov.kz/books/IT/%D0%9F%D0%B0%D1%82%D1%82%D0%B5%D1%80%D0%BD%D1%8B/Head%20First.%20%D0%9F%D0%B0%D1%82%D1%82%D0%B5%D1%80%D0%BD%D1%8B%20%D0%BF%D1%80%D0%BE%D0%B5%D0%BA%D1%82%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F%20%28%D0%AD%D1%80%D0%B8%D0%BA%20%D0%A4%D1%80%D0%B8%D0%BC%D0%B5%D0%BD%2C%20%D0%AD%D0%BB%D0%B8%D0%B7%D0%B0%D0%B1%D0%B5%D1%82%20%D0%A0%D0%BE%D0%B1%D1%81%D0%BE%D0%BD%29%202022.pdf) ([исходный код на Java](Head-First-Design-Patterns-master.zip))
+
+## Паттерны
+
+### Поведенческие
+
+1. [Стратегия](strategy/)
+2. [Наблюдатель](observer/)
+3. [Команда](command/)
+4. [Шаблонный метод](templatemethod/)
+5. [Итератор](iterator/)
+6. [Состояние](state/)
+
+### Структурные
+
+1. [Декоратор](decorator/)
+2. [Адаптер](adapter/)
+3. [Фасад](facade/)
+4. [Компоновщик](composite/)
+
+### Пораждающие
+
+1. [Фабричный метод (Простая фабрика)](factorymethod/)
+2. [Абстрактная фабрика](abstractfactory/)
+3. [Одиночка](singleton/)
+
+## Компиляция
+
+```sh
+dmd *.d
+```
+
+или
+
+```sh
+ldc2 *.d
+```

abstractfactory/README.md

@@ -0,0 +1,15 @@
+# Абстрактная фабрика
+
+Порождающий паттерн проектирования, который позволяет создавать семейства связанных объектов, не привязываясь к конкретным классам создаваемых объектов.
+
+Паттерн **Абстрактная Фабрика** предоставляет интерфейс создания семейств взаимосвязанных или взаимозависимых объектов без указания их конкретных классов.
+
+## Принципы
+
+- Код должен зависеть от абстракций, а не от конкретных классов
+
+## Схемы
+
+![scheme-1](scheme-1.png)
+
+![scheme-2](scheme-2.png)

abstractfactory/app.d

@@ -0,0 +1,37 @@
+module abstractfactory.app;
+
+import abstractfactory.pizza;
+import abstractfactory.pizzastore;
+import abstractfactory.nypizzastore;
+import abstractfactory.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);
+
+    pizza = chicagoStore.orderPizza("cheese");
+    writeln("Joel ordered a ", pizza);
+
+    pizza = nyStore.orderPizza("clam");
+    writeln("Ethan ordered a ", pizza);
+
+    pizza = chicagoStore.orderPizza("clam");
+    writeln("Joel ordered a ", pizza);
+
+    pizza = nyStore.orderPizza("pepperoni");
+    writeln("Ethan ordered a ", pizza);
+
+    pizza = chicagoStore.orderPizza("pepperoni");
+    writeln("Joel ordered a ", pizza);
+
+    pizza = nyStore.orderPizza("veggie");
+    writeln("Ethan ordered a ", pizza);
+
+    pizza = chicagoStore.orderPizza("veggie");
+    writeln("Joel ordered a ", pizza);
+}

abstractfactory/blackolives.d

@@ -0,0 +1,11 @@
+module abstractfactory.blackolives;
+
+import abstractfactory.veggies;
+
+class BlackOlives : Veggies
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Black Olives";
+    }
+}

abstractfactory/cheese.d

@@ -0,0 +1,9 @@
+module abstractfactory.cheese;
+
+interface Cheese
+{
+    string opBinary(string op : "~")(string s) const
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

abstractfactory/cheesepizza.d

@@ -0,0 +1,23 @@
+module abstractfactory.cheesepizza;
+
+import abstractfactory.pizza;
+import abstractfactory.pizzaingredientfactory;
+import std.stdio : writeln;
+
+class CheesePizza : Pizza
+{
+    PizzaIngredientFactory ingredientFactory;
+
+    this(PizzaIngredientFactory ingredientFactory)
+    {
+        this.ingredientFactory = ingredientFactory;
+    }
+
+    override void prepare()
+    {
+        writeln("Preparing ", name);
+        dough = ingredientFactory.createDough();
+        sauce = ingredientFactory.createSauce();
+        cheese = ingredientFactory.createCheese();
+    }
+}

abstractfactory/chicagopizzaingredientfactory.d

@@ -0,0 +1,51 @@
+module abstractfactory.chicagopizzaingredientfactory;
+
+import abstractfactory.pizzaingredientfactory;
+import abstractfactory.dough;
+import abstractfactory.thickcrustdough;
+import abstractfactory.sauce;
+import abstractfactory.plumtomatosauce;
+import abstractfactory.cheese;
+import abstractfactory.mozzarellacheese;
+import abstractfactory.veggies;
+import abstractfactory.blackolives;
+import abstractfactory.spinach;
+import abstractfactory.eggplant;
+import abstractfactory.pepperoni;
+import abstractfactory.slicedpepperoni;
+import abstractfactory.clams;
+import abstractfactory.frozenclams;
+
+class ChicagoPizzaIngredientFactory : PizzaIngredientFactory
+{
+    override Dough createDough()
+    {
+        return new ThinCrustDough();
+    }
+ 
+    override Sauce createSauce()
+    {
+        return new PlumTomatoSauce();
+    }
+ 
+    override Cheese createCheese()
+    {
+        return new MozzarellaCheese();
+    }
+ 
+    override Veggies[] createVeggies()
+    {
+        Veggies[] veggies = cast(Veggies[])[ new BlackOlives(), new Spinach(), new Eggplant() ];
+        return veggies;
+    }
+ 
+    override Pepperoni createPepperoni()
+    {
+        return new SlicedPepperoni();
+    }
+
+    override Clams createClam()
+    {
+        return new FrozenClams();
+    }
+}

abstractfactory/chicagopizzastore.d

@@ -0,0 +1,43 @@
+module abstractfactory.chicagopizzastore;
+
+import abstractfactory.pizza;
+import abstractfactory.pizzastore;
+import abstractfactory.pizzaingredientfactory;
+import abstractfactory.chicagopizzaingredientfactory;
+import abstractfactory.cheesepizza;
+import abstractfactory.veggiepizza;
+import abstractfactory.clampizza;
+import abstractfactory.pepperonipizza;
+
+class ChicagoPizzaStore : PizzaStore
+{
+protected:
+    override Pizza createPizza(string item)
+    {
+        Pizza pizza;
+        PizzaIngredientFactory ingredientFactory = new ChicagoPizzaIngredientFactory();
+
+        if (item == "cheese")
+        {
+            pizza = new CheesePizza(ingredientFactory);
+            pizza.setName("Chicago Style Cheese Pizza");
+        }
+        else if (item == "veggie")
+        {
+            pizza = new VeggiePizza(ingredientFactory);
+            pizza.setName("Chicago Style Veggie Pizza");
+        }
+        else if (item == "clam")
+        {
+            pizza = new ClamPizza(ingredientFactory);
+            pizza.setName("Chicago Style Clam Pizza");
+        }
+        else if (item == "pepperoni")
+        {
+            pizza = new PepperoniPizza(ingredientFactory);
+            pizza.setName("Chicago Style Pepperoni Pizza");
+        }
+
+        return pizza;
+    }
+}

abstractfactory/clampizza.d

@@ -0,0 +1,24 @@
+module abstractfactory.clampizza;
+
+import abstractfactory.pizza;
+import abstractfactory.pizzaingredientfactory;
+import std.stdio : writeln;
+
+class ClamPizza : Pizza
+{
+    PizzaIngredientFactory ingredientFactory;
+
+    this(PizzaIngredientFactory ingredientFactory)
+    {
+        this.ingredientFactory = ingredientFactory;
+    }
+
+    override void prepare()
+    {
+        writeln("Preparing ", name);
+        dough = ingredientFactory.createDough();
+        sauce = ingredientFactory.createSauce();
+        cheese = ingredientFactory.createCheese();
+        clams = ingredientFactory.createClam();
+    }
+}

abstractfactory/clams.d

@@ -0,0 +1,9 @@
+module abstractfactory.clams;
+
+interface Clams
+{
+    string opBinary(string op : "~")(string s) const
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

abstractfactory/dough.d

@@ -0,0 +1,9 @@
+module abstractfactory.dough;
+
+interface Dough
+{
+    string opBinary(string op : "~")(string s) const
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

abstractfactory/eggplant.d

@@ -0,0 +1,11 @@
+module abstractfactory.eggplant;
+
+import abstractfactory.veggies;
+
+class Eggplant : Veggies
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Eggplant";
+    }
+}

abstractfactory/freshclams.d

@@ -0,0 +1,11 @@
+module abstractfactory.freshclams;
+
+import abstractfactory.clams;
+
+class FreshClams : Clams
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Fresh Clams from Long Island Sound";
+    }
+}

abstractfactory/frozenclams.d

@@ -0,0 +1,11 @@
+module abstractfactory.frozenclams;
+
+import abstractfactory.clams;
+
+class FrozenClams : Clams
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Frozen Clams from Chesapeake Bay";
+    }
+}

abstractfactory/garlic.d

@@ -0,0 +1,11 @@
+module abstractfactory.garlic;
+
+import abstractfactory.veggies;
+
+class Garlic : Veggies
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Garlic";
+    }
+}

abstractfactory/marinarasauce.d

@@ -0,0 +1,11 @@
+module abstractfactory.marinarasauce;
+
+import abstractfactory.sauce;
+
+class MarinaraSauce : Sauce
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Marinara Sauce";
+    }
+}

abstractfactory/mozzarellacheese.d

@@ -0,0 +1,11 @@
+module abstractfactory.mozzarellacheese;
+
+import abstractfactory.cheese;
+
+class MozzarellaCheese : Cheese
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Shredded Mozzarella";
+    }
+}

abstractfactory/mushroom.d

@@ -0,0 +1,11 @@
+module abstractfactory.mushroom;
+
+import abstractfactory.veggies;
+
+class Mushroom : Veggies
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Mushroom";
+    }
+}

abstractfactory/nypizzaingredientfactory.d

@@ -0,0 +1,52 @@
+module abstractfactory.nypizzaingredientfactory;
+
+import abstractfactory.pizzaingredientfactory;
+import abstractfactory.dough;
+import abstractfactory.thincrustdough;
+import abstractfactory.sauce;
+import abstractfactory.marinarasauce;
+import abstractfactory.cheese;
+import abstractfactory.reggianocheese;
+import abstractfactory.veggies;
+import abstractfactory.garlic;
+import abstractfactory.onion;
+import abstractfactory.mushroom;
+import abstractfactory.redpepper;
+import abstractfactory.pepperoni;
+import abstractfactory.slicedpepperoni;
+import abstractfactory.clams;
+import abstractfactory.freshclams;
+
+class NYPizzaIngredientFactory : PizzaIngredientFactory
+{
+    override Dough createDough()
+    {
+        return new ThinCrustDough();
+    }
+ 
+    override Sauce createSauce()
+    {
+        return new MarinaraSauce();
+    }
+ 
+    override Cheese createCheese()
+    {
+        return new ReggianoCheese();
+    }
+ 
+    override Veggies[] createVeggies()
+    {
+        Veggies[] veggies = cast(Veggies[])[ new Garlic(), new Onion(), new Mushroom(), new RedPepper() ];
+        return veggies;
+    }
+ 
+    override Pepperoni createPepperoni()
+    {
+        return new SlicedPepperoni();
+    }
+
+    override Clams createClam()
+    {
+        return new FreshClams();
+    }
+}

abstractfactory/nypizzastore.d

@@ -0,0 +1,43 @@
+module abstractfactory.nypizzastore;
+
+import abstractfactory.pizza;
+import abstractfactory.pizzastore;
+import abstractfactory.pizzaingredientfactory;
+import abstractfactory.nypizzaingredientfactory;
+import abstractfactory.cheesepizza;
+import abstractfactory.veggiepizza;
+import abstractfactory.clampizza;
+import abstractfactory.pepperonipizza;
+
+class NYPizzaStore : PizzaStore
+{
+protected:
+    override Pizza createPizza(string item)
+    {
+        Pizza pizza;
+        PizzaIngredientFactory ingredientFactory = new NYPizzaIngredientFactory();
+
+        if (item == "cheese")
+        {
+            pizza = new CheesePizza(ingredientFactory);
+            pizza.setName("New York Style Cheese Pizza");
+        }
+        else if (item == "veggie")
+        {
+            pizza = new VeggiePizza(ingredientFactory);
+            pizza.setName("New York Style Veggie Pizza");
+        }
+        else if (item == "clam")
+        {
+            pizza = new ClamPizza(ingredientFactory);
+            pizza.setName("New York Style Clam Pizza");
+        }
+        else if (item == "pepperoni")
+        {
+            pizza = new PepperoniPizza(ingredientFactory);
+            pizza.setName("New York Style Pepperoni Pizza");
+        }
+
+        return pizza;
+    }
+}

abstractfactory/onion.d

@@ -0,0 +1,11 @@
+module abstractfactory.onion;
+
+import abstractfactory.veggies;
+
+class Onion : Veggies
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Onion";
+    }
+}

abstractfactory/pepperoni.d

@@ -0,0 +1,9 @@
+module abstractfactory.pepperoni;
+
+interface Pepperoni
+{
+    string opBinary(string op : "~")(string s) const
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

abstractfactory/pepperonipizza.d

@@ -0,0 +1,25 @@
+module abstractfactory.pepperonipizza;
+
+import abstractfactory.pizza;
+import abstractfactory.pizzaingredientfactory;
+import std.stdio : writeln;
+
+class PepperoniPizza : Pizza
+{
+    PizzaIngredientFactory ingredientFactory;
+
+    this(PizzaIngredientFactory ingredientFactory)
+    {
+        this.ingredientFactory = ingredientFactory;
+    }
+
+    override void prepare()
+    {
+        writeln("Preparing ", name);
+        dough = ingredientFactory.createDough();
+        sauce = ingredientFactory.createSauce();
+        cheese = ingredientFactory.createCheese();
+        veggies = ingredientFactory.createVeggies();
+        pepperoni = ingredientFactory.createPepperoni();
+    }
+}

abstractfactory/pizza.d

@@ -0,0 +1,88 @@
+module abstractfactory.pizza;
+
+import abstractfactory.dough;
+import abstractfactory.sauce;
+import abstractfactory.veggies;
+import abstractfactory.cheese;
+import abstractfactory.pepperoni;
+import abstractfactory.clams;
+import std.stdio : writeln;
+import std.conv : to;
+
+abstract class Pizza
+{
+protected:
+    string name;
+    Dough dough;
+    Sauce sauce;
+    Veggies[] veggies;
+    Cheese cheese;
+    Pepperoni pepperoni;
+    Clams clams;
+public:
+    void prepare();
+
+    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");
+    }
+
+    void setName(string name)
+    {
+        this.name = name;
+    }
+
+    string getName()
+    {
+        return name;
+    }
+
+    override string toString() const
+    {
+        string s;
+        s ~= "---- " ~ name ~ " ----\n";
+        if (dough !is null)
+        {
+            s ~= dough ~ "\n";
+        }
+        if (sauce !is null)
+        {
+            s ~= sauce ~ "\n";
+        }
+        if (cheese !is null)
+        {
+            s ~= cheese ~ "\n";
+        }
+        if (veggies.length)
+        {
+            foreach (key, val; veggies)
+            {
+                s ~= val.to!string;
+                if (key + 1 < veggies.length)
+                {
+                    s ~= ", ";
+                }
+            }
+        }
+        if (clams !is null)
+        {
+            s ~= clams ~ "\n";
+        }
+        if (pepperoni !is null)
+        {
+            s ~= pepperoni ~ "\n";
+        }
+
+        return s;
+    }
+}

abstractfactory/pizzaingredientfactory.d

@@ -0,0 +1,18 @@
+module abstractfactory.pizzaingredientfactory;
+
+import abstractfactory.dough;
+import abstractfactory.sauce;
+import abstractfactory.cheese;
+import abstractfactory.veggies;
+import abstractfactory.pepperoni;
+import abstractfactory.clams;
+
+interface PizzaIngredientFactory
+{
+    Dough createDough();
+    Sauce createSauce();
+    Cheese createCheese();
+    Veggies[] createVeggies();
+    Pepperoni createPepperoni();
+    Clams createClam();
+}

abstractfactory/pizzastore.d

@@ -0,0 +1,24 @@
+module abstractfactory.pizzastore;
+
+import abstractfactory.pizza;
+import std.stdio : writeln;
+
+abstract class PizzaStore
+{
+protected:
+    Pizza createPizza(string item);
+public:
+    Pizza orderPizza(string type)
+    {
+        Pizza pizza = createPizza(type);
+
+        writeln("--- Making a " ~ pizza.getName() ~ " ---");
+
+        pizza.prepare();
+        pizza.bake();
+        pizza.cut();
+        pizza.box();
+
+        return pizza;
+    }
+}

abstractfactory/plumtomatosauce.d

@@ -0,0 +1,11 @@
+module abstractfactory.plumtomatosauce;
+
+import abstractfactory.sauce;
+
+class PlumTomatoSauce : Sauce
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Tomato sauce with plum tomatoes";
+    }
+}

abstractfactory/redpepper.d

@@ -0,0 +1,11 @@
+module abstractfactory.redpepper;
+
+import abstractfactory.veggies;
+
+class RedPepper : Veggies
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Red Pepper";
+    }
+}

abstractfactory/reggianocheese.d

@@ -0,0 +1,11 @@
+module abstractfactory.reggianocheese;
+
+import abstractfactory.cheese;
+
+class ReggianoCheese : Cheese
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Reggiano Cheese";
+    }
+}

abstractfactory/sauce.d

@@ -0,0 +1,9 @@
+module abstractfactory.sauce;
+
+interface Sauce
+{
+    string opBinary(string op : "~")(string s) const
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

abstractfactory/slicedpepperoni.d

@@ -0,0 +1,11 @@
+module abstractfactory.slicedpepperoni;
+
+import abstractfactory.pepperoni;
+
+class SlicedPepperoni : Pepperoni
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Sliced Pepperoni";
+    }
+}

abstractfactory/spinach.d

@@ -0,0 +1,11 @@
+module abstractfactory.spinach;
+
+import abstractfactory.veggies;
+
+class Spinach : Veggies
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Spinach";
+    }
+}

abstractfactory/thickcrustdough.d

@@ -0,0 +1,16 @@
+module abstractfactory.thickcrustdough;
+
+import abstractfactory.dough;
+
+class ThinCrustDough : Dough
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "ThickCrust style extra thick crust dough";
+    }
+
+    string opBinary(string op : "~")(string s)
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

abstractfactory/thincrustdough.d

@@ -0,0 +1,16 @@
+module abstractfactory.thincrustdough;
+
+import abstractfactory.dough;
+
+class ThinCrustDough : Dough
+{
+    override string toString() const @safe pure nothrow
+    {
+        return "Thin Crust Dough";
+    }
+
+    string opBinary(string op : "~")(string s)
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

abstractfactory/veggiepizza.d

@@ -0,0 +1,24 @@
+module abstractfactory.veggiepizza;
+
+import abstractfactory.pizza;
+import abstractfactory.pizzaingredientfactory;
+import std.stdio : writeln;
+
+class VeggiePizza : Pizza
+{
+    PizzaIngredientFactory ingredientFactory;
+
+    this(PizzaIngredientFactory ingredientFactory)
+    {
+        this.ingredientFactory = ingredientFactory;
+    }
+
+    override void prepare()
+    {
+        writeln("Preparing ", name);
+        dough = ingredientFactory.createDough();
+        sauce = ingredientFactory.createSauce();
+        cheese = ingredientFactory.createCheese();
+        veggies = ingredientFactory.createVeggies();
+    }
+}

abstractfactory/veggies.d

@@ -0,0 +1,9 @@
+module abstractfactory.veggies;
+
+interface Veggies
+{
+    string opBinary(string op : "~")(string s) const
+    {
+        return (cast(Object)this).toString() ~ s;
+    }
+}

adapter/README.md

@@ -0,0 +1,19 @@
+# Адаптер
+
+Структурный паттерн проектирования, который позволяет объектам с несовместимыми интерфейсами работать вместе.
+
+Паттерн **Адаптер** преобразует интерфейс класса к другому интерфейсу, на который рассчитан клиент. Адаптер обеспечивает совместную работу классов, невозможную в обычных условиях из-за несовместимости интерфейсов.
+
+## Схемы
+
+![scheme-1](scheme-1.png)
+
+![scheme-2](scheme-2.png)
+
+![scheme-3](scheme-3.png)
+
+![scheme-4](scheme-4.png)
+
+![scheme-5](scheme-5.png)
+
+![scheme-6](scheme-6.png)

adapter/simpleadapter/app.d

@@ -0,0 +1,28 @@
+module app;
+
+import lib;
+import std.stdio : writeln;
+
+void main()
+{
+    Duck duck = new MallardDuck();
+
+    Turkey turkey = new WildTurkey();
+    Duck turkeyAdapter = new TurkeyAdapter(turkey);
+
+    writeln("The Turkey says...");
+    turkey.gobble();
+    turkey.fly();
+
+    writeln("\nThe Duck says...");
+    testDuck(duck);
+
+    writeln("\nThe TurkeyAdapter says...");
+    testDuck(turkeyAdapter);
+}
+
+void testDuck(Duck duck)
+{
+    duck.quack();
+    duck.fly();
+}

adapter/simpleadapter/lib/duck.d

@@ -0,0 +1,7 @@
+module lib.duck;
+
+interface Duck
+{
+    void quack();
+    void fly();
+}

adapter/simpleadapter/lib/mallarduck.d

@@ -0,0 +1,17 @@
+module lib.mallarduck;
+
+import lib.duck;
+import std.stdio : writeln;
+
+class MallardDuck : Duck
+{
+    void quack()
+    {
+        writeln("Quack!");
+    }
+
+    void fly()
+    {
+        writeln("I'm flying");
+    }
+}

adapter/simpleadapter/lib/package.d

@@ -0,0 +1,7 @@
+module lib;
+
+public import lib.duck;
+public import lib.mallarduck;
+public import lib.turkey;
+public import lib.turkeyadapter;
+public import lib.wildturkey;

adapter/simpleadapter/lib/turkey.d

@@ -0,0 +1,7 @@
+module lib.turkey;
+
+interface Turkey
+{
+    void gobble();
+    void fly();
+}

adapter/simpleadapter/lib/turkeyadapter.d

@@ -0,0 +1,27 @@
+module lib.turkeyadapter;
+
+import lib.turkey;
+import lib.duck;
+
+class TurkeyAdapter : Duck
+{
+    Turkey turkey;
+
+    this(Turkey turkey)
+    {
+        this.turkey = turkey;
+    }
+
+    void quack()
+    {
+        turkey.gobble();
+    }
+
+    void fly()
+    {
+        foreach (val; 0..5)
+        {
+            turkey.fly();
+        }        
+    }
+}

adapter/simpleadapter/lib/wildturkey.d

@@ -0,0 +1,17 @@
+module lib.wildturkey;
+
+import lib.turkey;
+import std.stdio : writeln;
+
+class WildTurkey : Turkey
+{
+    void gobble()
+    {
+        writeln("Gobble gobble");
+    }
+
+    void fly()
+    {
+        writeln("I'm flying a short distance");
+    }
+}

command/README.md

@@ -0,0 +1,13 @@
+# Команда
+
+Поведенческий паттерн проектирования, который превращает запросы в объекты, позволяя передавать их как аргументы при вызове методов, ставить запросы в очередь, логировать их, а также поддерживать отмену операций.
+
+Паттерн **Команда** инкапсулирует запрос в виде объекта, делая возможной параметризацию клиентских объектов с другими запросами, организацию очереди или регистрацию запросов, а также поддержку отмены операций.
+
+## Схемы
+
+![scheme-1](scheme-1.png)
+
+![scheme-2](scheme-2.png)
+
+![scheme-3](scheme-3.png)

command/remote/app.d

@@ -0,0 +1,57 @@
+module command.remote.app;
+
+import command.remote.remotecontrol;
+import command.remote.lightoncommand;
+import command.remote.lightoffcommand;
+import command.remote.light;
+import command.remote.ceilingfan;
+import command.remote.ceilingfanoffcommand;
+import command.remote.ceilingfanoncommand;
+import command.remote.garagedoorupcommand;
+import command.remote.garagedoordowncommand;
+import command.remote.garagedoor;
+import command.remote.stereoonwithcdcommand;
+import command.remote.stereo;
+import command.remote.stereooffcommand;
+import std.stdio : writeln;
+
+void main()
+{
+    auto remoteControl = new RemoteControl();
+
+    auto livingRoomLight = new Light("Living Room");
+    auto kitchenLight =  new Light("Kitchen");
+    auto ceilingFan = new CeilingFan("Living Room");
+    auto garageDoor = new GarageDoor("Garage");
+    auto stereo = new Stereo("Living Room");
+
+    auto livingRoomLightOn = new LightOnCommand(livingRoomLight);
+    auto livingRoomLightOff = new LightOffCommand(livingRoomLight);
+    auto kitchenLightOn = new LightOnCommand(kitchenLight);
+    auto kitchenLightOff = new LightOffCommand(kitchenLight);
+    auto ceilingFanOn = new CeilingFanOnCommand(ceilingFan);
+    auto ceilingFanOff = new CeilingFanOffCommand(ceilingFan);
+    auto garageDoorUp = new GarageDoorUpCommand(garageDoor);
+    auto garageDoorDown = new GarageDoorDownCommand(garageDoor);
+    auto stereoOnWithCD = new StereoOnWithCDCommand(stereo);
+    auto stereoOff = new StereoOffCommand(stereo);
+
+    remoteControl.setCommand(0, livingRoomLightOn, livingRoomLightOff);
+    remoteControl.setCommand(1, kitchenLightOn, kitchenLightOff);
+    remoteControl.setCommand(2, ceilingFanOn, ceilingFanOff);
+    remoteControl.setCommand(3, stereoOnWithCD, stereoOff);
+    remoteControl.setCommand(4, garageDoorUp, garageDoorDown);
+
+    writeln(remoteControl);
+
+    remoteControl.onButtonWasPressed(0);
+    remoteControl.offButtonWasPressed(0);
+    remoteControl.onButtonWasPressed(1);
+    remoteControl.offButtonWasPressed(1);
+    remoteControl.onButtonWasPressed(2);
+    remoteControl.offButtonWasPressed(2);
+    remoteControl.onButtonWasPressed(3);
+    remoteControl.offButtonWasPressed(3);
+    remoteControl.onButtonWasPressed(4);
+    remoteControl.offButtonWasPressed(4);
+}

command/remote/ceilingfan.d

@@ -0,0 +1,48 @@
+module command.remote.ceilingfan;
+
+import std.stdio : writeln;
+
+class CeilingFan
+{
+    private string location;
+    private int level;
+
+    static int HIGH = 2;
+    static int MEDIUM = 1;
+    static int LOW = 0;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+    
+    void high()
+    {
+        level = HIGH;
+        writeln(location ~ " ceiling fan is on high");
+ 
+    } 
+
+    void medium()
+    {
+        level = MEDIUM;
+        writeln(location ~ " ceiling fan is on medium");
+    }
+
+    void low()
+    {
+        level = LOW;
+        writeln(location ~ " ceiling fan is on low");
+    }
+ 
+    void off()
+    {
+        level = 0;
+        writeln(location ~ " ceiling fan is off");
+    }
+ 
+    int getSpeed()
+    {
+        return level;
+    }
+}

command/remote/ceilingfanoffcommand.d

@@ -0,0 +1,19 @@
+module command.remote.ceilingfanoffcommand;
+
+import command.remote.command;
+import command.remote.ceilingfan;
+
+class CeilingFanOffCommand : Command
+{
+    CeilingFan ceilingFan;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    override void execute()
+    {
+        ceilingFan.off();
+    }
+}

command/remote/ceilingfanoncommand.d

@@ -0,0 +1,19 @@
+module command.remote.ceilingfanoncommand;
+
+import command.remote.command;
+import command.remote.ceilingfan;
+
+class CeilingFanOnCommand : Command
+{
+    CeilingFan ceilingFan;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    override void execute()
+    {
+        ceilingFan.high();
+    }
+}

command/remote/command.d

@@ -0,0 +1,6 @@
+module command.remote.command;
+
+interface Command
+{
+    void execute();
+}

command/remote/garagedoor.d

@@ -0,0 +1,38 @@
+module command.remote.garagedoor;
+
+import std.stdio : writeln;
+
+class GarageDoor
+{
+    private string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void up()
+    {
+        writeln(location ~ " garage Door is Up");
+    }
+
+    void down()
+    {
+        writeln(location ~ " garage Door is Down");
+    }
+
+    void stop()
+    {
+        writeln(location ~ " garage Door is Stopped");
+    }
+
+    void lightOn()
+    {
+        writeln(location ~ " garage light is on");
+    }
+
+    void lightOff()
+    {
+        writeln(location ~ " garage light is off");
+    }
+}

command/remote/garagedoordowncommand.d

@@ -0,0 +1,19 @@
+module command.remote.garagedoordowncommand;
+
+import command.remote.command;
+import command.remote.garagedoor;
+
+class GarageDoorDownCommand : Command
+{
+    GarageDoor garageDoor;
+
+    this(GarageDoor garageDoor)
+    {
+        this.garageDoor = garageDoor;
+    }
+
+    override void execute()
+    {
+        garageDoor.down();
+    }
+}

command/remote/garagedoorupcommand.d

@@ -0,0 +1,19 @@
+module command.remote.garagedoorupcommand;
+
+import command.remote.command;
+import command.remote.garagedoor;
+
+class GarageDoorUpCommand : Command
+{
+    GarageDoor garageDoor;
+
+    this(GarageDoor garageDoor)
+    {
+        this.garageDoor = garageDoor;
+    }
+
+    override void execute()
+    {
+        garageDoor.up();
+    }
+}

command/remote/light.d

@@ -0,0 +1,23 @@
+module command.remote.light;
+
+import std.stdio : writeln;
+
+class Light
+{
+    private string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void on()
+    {
+        writeln(location ~ " light is On");
+    }
+
+    void off()
+    {
+        writeln(location ~ " light is Off");
+    }
+}

command/remote/lightoffcommand.d

@@ -0,0 +1,19 @@
+module command.remote.lightoffcommand;
+
+import command.remote.command;
+import command.remote.light;
+
+class LightOffCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    override void execute()
+    {
+        light.off();
+    }
+}

command/remote/lightoncommand.d

@@ -0,0 +1,19 @@
+module command.remote.lightoncommand;
+
+import command.remote.command;
+import command.remote.light;
+
+class LightOnCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    override void execute()
+    {
+        light.on();
+    }
+}

command/remote/nocommand.d

@@ -0,0 +1,8 @@
+module command.remote.nocommand;
+
+import command.remote.command;
+
+class NoCommand : Command
+{
+    override void execute() {}
+}

command/remote/remotecontrol.d

@@ -0,0 +1,54 @@
+module command.remote.remotecontrol;
+
+import command.remote.command;
+import command.remote.nocommand;
+import std.conv : to;
+import std.stdio : writeln;
+import std.algorithm.mutation : fill;
+import std.array : split, back;
+import std.format;
+
+class RemoteControl
+{
+    Command[] onCommands;
+    Command[] offCommands;
+
+    this()
+    {
+        onCommands = new Command[7];
+        offCommands = new Command[7];
+        Command noCommand = new NoCommand();
+        fill(onCommands, noCommand);        
+        fill(offCommands, noCommand);
+    }
+
+    void setCommand(int slot, Command onCommand, Command offCommand)
+    {
+        onCommands[slot] = onCommand;
+        offCommands[slot] = offCommand;
+    }
+
+    void onButtonWasPressed(int slot)
+    {
+        onCommands[slot].execute();
+    }
+
+    void offButtonWasPressed(int slot)
+    {
+        offCommands[slot].execute();
+    }
+
+    override string toString() const
+    {
+        string s = "\n------ Remote Control -------\n";
+        for (int i = 0; i < 7; ++i)
+        {
+            s ~= "[slot " ~ i.to!string ~ "] "
+                ~ format("%22s", (cast(Object)onCommands[i]).classinfo.name.split(".").back())
+                ~ format("%23s", (cast(Object)offCommands[i]).classinfo.name.split(".").back())
+                ~ "\n";
+        }
+
+        return s;
+    }
+}

command/remote/stereo.d

@@ -0,0 +1,44 @@
+module command.remote.stereo;
+
+import std.stdio : writeln;
+import std.conv : to;
+
+class Stereo
+{
+    string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void on()
+    {
+        writeln(location ~ " stereo is on");
+    }
+
+    void off()
+    {
+        writeln(location ~ " stereo is off");
+    }
+
+    void setCD()
+    {
+        writeln(location ~ " stereo is set for CD input");
+    }
+
+    void setDVD()
+    {
+        writeln(location ~ " stereo is set for DVD input");
+    }
+
+    void setRadio()
+    {
+        writeln(location ~ " stereo is set for Radio");
+    }
+
+    void setVolume(int volume)
+    {
+        writeln(location ~ " stereo volume set to " ~ volume.to!string);
+    }
+}

command/remote/stereooffcommand.d

@@ -0,0 +1,19 @@
+module command.remote.stereooffcommand;
+
+import command.remote.command;
+import command.remote.stereo;
+
+class StereoOffCommand : Command
+{
+    Stereo stereo;
+ 
+    this(Stereo stereo)
+    {
+        this.stereo = stereo;
+    }
+ 
+    void execute()
+    {
+        stereo.off();
+    }
+}

command/remote/stereoonwithcdcommand.d

@@ -0,0 +1,21 @@
+module command.remote.stereoonwithcdcommand;
+
+import command.remote.command;
+import command.remote.stereo;
+
+class StereoOnWithCDCommand : Command
+{
+    Stereo stereo;
+ 
+    this(Stereo stereo)
+    {
+        this.stereo = stereo;
+    }
+ 
+    void execute()
+    {
+        stereo.on();
+        stereo.setCD();
+        stereo.setVolume(11);
+    }
+}

command/remoteundo/app.d

@@ -0,0 +1,52 @@
+module command.remoteundo.app;
+
+import command.remoteundo.remotecontrol;
+import command.remoteundo.lightoncommand;
+import command.remoteundo.lightoffcommand;
+import command.remoteundo.light;
+import command.remoteundo.ceilingfan;
+import command.remoteundo.ceilingfanoffcommand;
+import command.remoteundo.ceilingfanoncommand;
+import command.remoteundo.garagedoorupcommand;
+import command.remoteundo.garagedoordowncommand;
+import command.remoteundo.garagedoor;
+import command.remoteundo.stereoonwithcdcommand;
+import command.remoteundo.stereo;
+import command.remoteundo.stereooffcommand;
+import std.stdio : writeln;
+
+void main()
+{
+    auto remoteControl = new RemoteControl();
+
+    auto livingRoomLight = new Light("Living Room");
+    // auto kitchenLight =  new Light("Kitchen");
+    // auto ceilingFan = new CeilingFan("Living Room");
+    // auto garageDoor = new GarageDoor("Garage");
+    // auto stereo = new Stereo("Living Room");
+
+    remoteControl.setCommand(0, new LightOnCommand(livingRoomLight), new LightOffCommand(livingRoomLight));
+    // remoteControl.setCommand(1, new LightOnCommand(kitchenLight), new LightOffCommand(kitchenLight));
+    // remoteControl.setCommand(2, new CeilingFanOnCommand(ceilingFan), new CeilingFanOffCommand(ceilingFan));
+    // remoteControl.setCommand(3, new StereoOnWithCDCommand(stereo), new StereoOffCommand(stereo));
+    // remoteControl.setCommand(4, new GarageDoorUpCommand(garageDoor), new GarageDoorDownCommand(garageDoor));
+
+    // writeln(remoteControl);
+
+    remoteControl.onButtonWasPushed(0);
+    remoteControl.offButtonWasPushed(0);
+    writeln(remoteControl);
+    remoteControl.undoButtonWasPushed();
+    remoteControl.offButtonWasPushed(0);
+    remoteControl.onButtonWasPushed(0);
+    writeln(remoteControl);
+    remoteControl.undoButtonWasPushed();
+    // remoteControl.onButtonWasPushed(1);
+    // remoteControl.offButtonWasPushed(1);
+    // remoteControl.onButtonWasPushed(2);
+    // remoteControl.offButtonWasPushed(2);
+    // remoteControl.onButtonWasPushed(3);
+    // remoteControl.offButtonWasPushed(3);
+    // remoteControl.onButtonWasPushed(4);
+    // remoteControl.offButtonWasPushed(4);
+}

command/remoteundo/ceilingfan.d

@@ -0,0 +1,48 @@
+module command.remoteundo.ceilingfan;
+
+import std.stdio : writeln;
+
+class CeilingFan
+{
+    private string location;
+    private int level;
+
+    static int HIGH = 2;
+    static int MEDIUM = 1;
+    static int LOW = 0;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+    
+    void high()
+    {
+        level = HIGH;
+        writeln(location ~ " ceiling fan is on high");
+ 
+    } 
+
+    void medium()
+    {
+        level = MEDIUM;
+        writeln(location ~ " ceiling fan is on medium");
+    }
+
+    void low()
+    {
+        level = LOW;
+        writeln(location ~ " ceiling fan is on low");
+    }
+ 
+    void off()
+    {
+        level = 0;
+        writeln(location ~ " ceiling fan is off");
+    }
+ 
+    int getSpeed()
+    {
+        return level;
+    }
+}

command/remoteundo/ceilingfanoffcommand.d

@@ -0,0 +1,24 @@
+module command.remoteundo.ceilingfanoffcommand;
+
+import command.remoteundo.command;
+import command.remoteundo.ceilingfan;
+
+class CeilingFanOffCommand : Command
+{
+    CeilingFan ceilingFan;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    void execute()
+    {
+        ceilingFan.off();
+    }
+
+    void undo()
+    {
+        ceilingFan.high();
+    }
+}

command/remoteundo/ceilingfanoncommand.d

@@ -0,0 +1,24 @@
+module command.remoteundo.ceilingfanoncommand;
+
+import command.remoteundo.command;
+import command.remoteundo.ceilingfan;
+
+class CeilingFanOnCommand : Command
+{
+    CeilingFan ceilingFan;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    void execute()
+    {
+        ceilingFan.high();
+    }
+
+    void undo()
+    {
+        ceilingFan.off();
+    }
+}

command/remoteundo/command.d

@@ -0,0 +1,7 @@
+module command.remoteundo.command;
+
+interface Command
+{
+    void execute();
+    void undo();
+}

command/remoteundo/garagedoor.d

@@ -0,0 +1,38 @@
+module command.remoteundo.garagedoor;
+
+import std.stdio : writeln;
+
+class GarageDoor
+{
+    private string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void up()
+    {
+        writeln(location ~ " garage Door is Up");
+    }
+
+    void down()
+    {
+        writeln(location ~ " garage Door is Down");
+    }
+
+    void stop()
+    {
+        writeln(location ~ " garage Door is Stopped");
+    }
+
+    void lightOn()
+    {
+        writeln(location ~ " garage light is on");
+    }
+
+    void lightOff()
+    {
+        writeln(location ~ " garage light is off");
+    }
+}

command/remoteundo/garagedoordowncommand.d

@@ -0,0 +1,24 @@
+module command.remoteundo.garagedoordowncommand;
+
+import command.remoteundo.command;
+import command.remoteundo.garagedoor;
+
+class GarageDoorDownCommand : Command
+{
+    GarageDoor garageDoor;
+
+    this(GarageDoor garageDoor)
+    {
+        this.garageDoor = garageDoor;
+    }
+
+    void execute()
+    {
+        garageDoor.down();
+    }
+
+    void undo()
+    {
+        garageDoor.up();
+    }
+}

command/remoteundo/garagedoorupcommand.d

@@ -0,0 +1,24 @@
+module command.remoteundo.garagedoorupcommand;
+
+import command.remoteundo.command;
+import command.remoteundo.garagedoor;
+
+class GarageDoorUpCommand : Command
+{
+    GarageDoor garageDoor;
+
+    this(GarageDoor garageDoor)
+    {
+        this.garageDoor = garageDoor;
+    }
+
+    void execute()
+    {
+        garageDoor.up();
+    }
+
+    void undo()
+    {
+        garageDoor.down();
+    }
+}

command/remoteundo/light.d

@@ -0,0 +1,23 @@
+module command.remoteundo.light;
+
+import std.stdio : writeln;
+
+class Light
+{
+    private string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void on()
+    {
+        writeln(location ~ " light is On");
+    }
+
+    void off()
+    {
+        writeln(location ~ " light is Off");
+    }
+}

command/remoteundo/lightoffcommand.d

@@ -0,0 +1,24 @@
+module command.remoteundo.lightoffcommand;
+
+import command.remoteundo.command;
+import command.remoteundo.light;
+
+class LightOffCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    void execute()
+    {
+        light.off();
+    }
+
+    void undo()
+    {
+        light.on();
+    }
+}

command/remoteundo/lightoncommand.d

@@ -0,0 +1,24 @@
+module command.remoteundo.lightoncommand;
+
+import command.remoteundo.command;
+import command.remoteundo.light;
+
+class LightOnCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    void execute()
+    {
+        light.on();
+    }
+
+    void undo()
+    {
+        light.off();
+    }
+}

command/remoteundo/nocommand.d

@@ -0,0 +1,9 @@
+module command.remoteundo.nocommand;
+
+import command.remoteundo.command;
+
+class NoCommand : Command
+{
+    void execute() {}
+    void undo() {}
+}

command/remoteundo/remotecontrol.d

@@ -0,0 +1,63 @@
+module command.remoteundo.remotecontrol;
+
+import command.remoteundo.command;
+import command.remoteundo.nocommand;
+import std.conv : to;
+import std.stdio : writeln;
+import std.algorithm.mutation : fill;
+import std.array : split, back;
+import std.format;
+
+class RemoteControl
+{
+    Command[] onCommands;
+    Command[] offCommands;
+    Command undoCommand;
+
+    this()
+    {
+        onCommands = new Command[7];
+        offCommands = new Command[7];
+        Command noCommand = new NoCommand();
+        fill(onCommands, noCommand);        
+        fill(offCommands, noCommand);
+        undoCommand = noCommand;
+    }
+
+    void setCommand(int slot, Command onCommand, Command offCommand)
+    {
+        onCommands[slot] = onCommand;
+        offCommands[slot] = offCommand;
+    }
+
+    void onButtonWasPushed(int slot)
+    {
+        onCommands[slot].execute();
+        undoCommand = onCommands[slot];
+    }
+
+    void offButtonWasPushed(int slot)
+    {
+        offCommands[slot].execute();
+        undoCommand = offCommands[slot];
+    }
+
+    void undoButtonWasPushed()
+    {
+        undoCommand.undo();
+    }
+
+    override string toString() const
+    {
+        string s = "\n------ Remote Control -------\n";
+        for (int i = 0; i < 7; ++i)
+        {
+            s ~= "[slot " ~ i.to!string ~ "] "
+                ~ format("%22s", (cast(Object)onCommands[i]).classinfo.name.split(".").back())
+                ~ format("%23s", (cast(Object)offCommands[i]).classinfo.name.split(".").back())
+                ~ "\n";
+        }
+
+        return s ~ "[undo] " ~ (cast(Object)undoCommand).classinfo.name.split(".").back() ~ "\n";
+    }
+}

command/remoteundo/stereo.d

@@ -0,0 +1,44 @@
+module command.remoteundo.stereo;
+
+import std.stdio : writeln;
+import std.conv : to;
+
+class Stereo
+{
+    string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void on()
+    {
+        writeln(location ~ " stereo is on");
+    }
+
+    void off()
+    {
+        writeln(location ~ " stereo is off");
+    }
+
+    void setCD()
+    {
+        writeln(location ~ " stereo is set for CD input");
+    }
+
+    void setDVD()
+    {
+        writeln(location ~ " stereo is set for DVD input");
+    }
+
+    void setRadio()
+    {
+        writeln(location ~ " stereo is set for Radio");
+    }
+
+    void setVolume(int volume)
+    {
+        writeln(location ~ " stereo volume set to " ~ volume.to!string);
+    }
+}

command/remoteundo/stereooffcommand.d

@@ -0,0 +1,26 @@
+module command.remoteundo.stereooffcommand;
+
+import command.remoteundo.command;
+import command.remoteundo.stereo;
+
+class StereoOffCommand : Command
+{
+    Stereo stereo;
+ 
+    this(Stereo stereo)
+    {
+        this.stereo = stereo;
+    }
+ 
+    void execute()
+    {
+        stereo.off();
+    }
+
+    void undo()
+    {
+        stereo.on();
+        stereo.setCD();
+        stereo.setVolume(11);
+    }
+}

command/remoteundo/stereoonwithcdcommand.d

@@ -0,0 +1,26 @@
+module command.remoteundo.stereoonwithcdcommand;
+
+import command.remoteundo.command;
+import command.remoteundo.stereo;
+
+class StereoOnWithCDCommand : Command
+{
+    Stereo stereo;
+ 
+    this(Stereo stereo)
+    {
+        this.stereo = stereo;
+    }
+ 
+    void execute()
+    {
+        stereo.on();
+        stereo.setCD();
+        stereo.setVolume(11);
+    }
+
+    void undo()
+    {
+        stereo.off();
+    }
+}

command/remoteundostatus/app.d

@@ -0,0 +1,36 @@
+module command.remoteundostatus.app;
+
+import command.remoteundostatus.remotecontrol;
+import command.remoteundostatus.lightoncommand;
+import command.remoteundostatus.lightoffcommand;
+import command.remoteundostatus.light;
+import command.remoteundostatus.ceilingfan;
+import command.remoteundostatus.ceilingfanoffcommand;
+import command.remoteundostatus.ceilingfanhighcommand;
+import command.remoteundostatus.ceilingfanmediumcommand;
+import command.remoteundostatus.ceilingfanlowcommand;
+import command.remoteundostatus.garagedoorupcommand;
+import command.remoteundostatus.garagedoordowncommand;
+import command.remoteundostatus.garagedoor;
+import command.remoteundostatus.stereoonwithcdcommand;
+import command.remoteundostatus.stereo;
+import command.remoteundostatus.stereooffcommand;
+import std.stdio : writeln;
+
+void main()
+{
+    auto remoteControl = new RemoteControl();
+
+    auto ceilingFan = new CeilingFan("Living Room");
+
+    remoteControl.setCommand(0, new CeilingFanMediumCommand(ceilingFan), new CeilingFanOffCommand(ceilingFan));
+    remoteControl.setCommand(1, new CeilingFanHighCommand(ceilingFan), new CeilingFanOffCommand(ceilingFan));
+
+    remoteControl.onButtonWasPushed(0);
+    remoteControl.offButtonWasPushed(0);
+    writeln(remoteControl);
+    remoteControl.undoButtonWasPushed();
+    remoteControl.onButtonWasPushed(1);
+    writeln(remoteControl);
+    remoteControl.undoButtonWasPushed();
+}

command/remoteundostatus/ceilingfan.d

@@ -0,0 +1,49 @@
+module command.remoteundostatus.ceilingfan;
+
+import std.stdio : writeln;
+
+class CeilingFan
+{
+    private string location;
+    private int speed;
+
+    static const int HIGH = 3;
+    static const int MEDIUM = 2;
+    static const int LOW = 1;
+    static const int OFF = 0;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+    
+    void high()
+    {
+        speed = HIGH;
+        writeln(location ~ " ceiling fan is on high");
+ 
+    } 
+
+    void medium()
+    {
+        speed = MEDIUM;
+        writeln(location ~ " ceiling fan is on medium");
+    }
+
+    void low()
+    {
+        speed = LOW;
+        writeln(location ~ " ceiling fan is on low");
+    }
+ 
+    void off()
+    {
+        speed = OFF;
+        writeln(location ~ " ceiling fan is off");
+    }
+ 
+    int getSpeed()
+    {
+        return speed;
+    }
+}

command/remoteundostatus/ceilingfanhighcommand.d

@@ -0,0 +1,41 @@
+module command.remoteundostatus.ceilingfanhighcommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.ceilingfan;
+
+class CeilingFanHighCommand : Command
+{
+    CeilingFan ceilingFan;
+    int prevSpeed;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    void execute()
+    {
+        prevSpeed = ceilingFan.getSpeed();
+        ceilingFan.high();
+    }
+
+    void undo()
+    {
+        switch (prevSpeed)
+        {
+            case CeilingFan.HIGH:
+                ceilingFan.high();
+                break;
+            case CeilingFan.MEDIUM:
+                ceilingFan.medium();
+                break;
+            case CeilingFan.LOW:
+                ceilingFan.low();
+                break;
+            case CeilingFan.OFF:
+                ceilingFan.off();
+                break;
+            default: break;
+        }
+    }
+}

command/remoteundostatus/ceilingfanlowcommand.d

@@ -0,0 +1,41 @@
+module command.remoteundostatus.ceilingfanlowcommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.ceilingfan;
+
+class CeilingFanLowCommand : Command
+{
+    CeilingFan ceilingFan;
+    int prevSpeed;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    void execute()
+    {
+        prevSpeed = ceilingFan.getSpeed();
+        ceilingFan.low();
+    }
+
+    void undo()
+    {
+        switch (prevSpeed)
+        {
+            case CeilingFan.HIGH:
+                ceilingFan.high();
+                break;
+            case CeilingFan.MEDIUM:
+                ceilingFan.medium();
+                break;
+            case CeilingFan.LOW:
+                ceilingFan.low();
+                break;
+            case CeilingFan.OFF:
+                ceilingFan.off();
+                break;
+            default: break;
+        }
+    }
+}

command/remoteundostatus/ceilingfanmediumcommand.d

@@ -0,0 +1,41 @@
+module command.remoteundostatus.ceilingfanmediumcommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.ceilingfan;
+
+class CeilingFanMediumCommand : Command
+{
+    CeilingFan ceilingFan;
+    int prevSpeed;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    void execute()
+    {
+        prevSpeed = ceilingFan.getSpeed();
+        ceilingFan.medium();
+    }
+
+    void undo()
+    {
+        switch (prevSpeed)
+        {
+            case CeilingFan.HIGH:
+                ceilingFan.high();
+                break;
+            case CeilingFan.MEDIUM:
+                ceilingFan.medium();
+                break;
+            case CeilingFan.LOW:
+                ceilingFan.low();
+                break;
+            case CeilingFan.OFF:
+                ceilingFan.off();
+                break;
+            default: break;
+        }
+    }
+}

command/remoteundostatus/ceilingfanoffcommand.d

@@ -0,0 +1,41 @@
+module command.remoteundostatus.ceilingfanoffcommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.ceilingfan;
+
+class CeilingFanOffCommand : Command
+{
+    CeilingFan ceilingFan;
+    int prevSpeed;
+
+    this(CeilingFan ceilingFan)
+    {
+        this.ceilingFan = ceilingFan;
+    }
+
+    void execute()
+    {
+        prevSpeed = ceilingFan.getSpeed();
+        ceilingFan.off();
+    }
+
+    void undo()
+    {
+        switch (prevSpeed)
+        {
+            case CeilingFan.HIGH:
+                ceilingFan.high();
+                break;
+            case CeilingFan.MEDIUM:
+                ceilingFan.medium();
+                break;
+            case CeilingFan.LOW:
+                ceilingFan.low();
+                break;
+            case CeilingFan.OFF:
+                ceilingFan.off();
+                break;
+            default: break;
+        }
+    }
+}

command/remoteundostatus/command.d

@@ -0,0 +1,7 @@
+module command.remoteundostatus.command;
+
+interface Command
+{
+    void execute();
+    void undo();
+}

command/remoteundostatus/garagedoor.d

@@ -0,0 +1,38 @@
+module command.remoteundostatus.garagedoor;
+
+import std.stdio : writeln;
+
+class GarageDoor
+{
+    private string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void up()
+    {
+        writeln(location ~ " garage Door is Up");
+    }
+
+    void down()
+    {
+        writeln(location ~ " garage Door is Down");
+    }
+
+    void stop()
+    {
+        writeln(location ~ " garage Door is Stopped");
+    }
+
+    void lightOn()
+    {
+        writeln(location ~ " garage light is on");
+    }
+
+    void lightOff()
+    {
+        writeln(location ~ " garage light is off");
+    }
+}

command/remoteundostatus/garagedoordowncommand.d

@@ -0,0 +1,24 @@
+module command.remoteundostatus.garagedoordowncommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.garagedoor;
+
+class GarageDoorDownCommand : Command
+{
+    GarageDoor garageDoor;
+
+    this(GarageDoor garageDoor)
+    {
+        this.garageDoor = garageDoor;
+    }
+
+    void execute()
+    {
+        garageDoor.down();
+    }
+
+    void undo()
+    {
+        garageDoor.up();
+    }
+}

command/remoteundostatus/garagedoorupcommand.d

@@ -0,0 +1,24 @@
+module command.remoteundostatus.garagedoorupcommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.garagedoor;
+
+class GarageDoorUpCommand : Command
+{
+    GarageDoor garageDoor;
+
+    this(GarageDoor garageDoor)
+    {
+        this.garageDoor = garageDoor;
+    }
+
+    void execute()
+    {
+        garageDoor.up();
+    }
+
+    void undo()
+    {
+        garageDoor.down();
+    }
+}

command/remoteundostatus/light.d

@@ -0,0 +1,23 @@
+module command.remoteundostatus.light;
+
+import std.stdio : writeln;
+
+class Light
+{
+    private string location;
+
+    this(string location)
+    {
+        this.location = location;
+    }
+
+    void on()
+    {
+        writeln(location ~ " light is On");
+    }
+
+    void off()
+    {
+        writeln(location ~ " light is Off");
+    }
+}

command/remoteundostatus/lightoffcommand.d

@@ -0,0 +1,24 @@
+module command.remoteundostatus.lightoffcommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.light;
+
+class LightOffCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    void execute()
+    {
+        light.off();
+    }
+
+    void undo()
+    {
+        light.on();
+    }
+}

command/remoteundostatus/lightoncommand.d

@@ -0,0 +1,24 @@
+module command.remoteundostatus.lightoncommand;
+
+import command.remoteundostatus.command;
+import command.remoteundostatus.light;
+
+class LightOnCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    void execute()
+    {
+        light.on();
+    }
+
+    void undo()
+    {
+        light.off();
+    }
+}