decorator

decorator/coffee/app.d

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+module decorator.coffee.app;
+
+import decorator.coffee.beverage;
+import decorator.coffee.espresso;
+import decorator.coffee.darkroast;
+import decorator.coffee.houseblend;
+import decorator.coffee.decaf;
+import decorator.coffee.mocha;
+import decorator.coffee.milk;
+import decorator.coffee.soy;
+import decorator.coffee.whip;
+import std.stdio : writeln;
+
+void print(Beverage beverage)
+{
+    writeln(beverage.getDescription(), " $", beverage.cost());
+}
+
+void main()
+{
+    Beverage beverage = new Espresso();
+    print(beverage);
+
+    Beverage beverage2 = new DarkRoast();
+    beverage2 = new Mocha(beverage2);
+    beverage2 = new Mocha(beverage2);
+    beverage2 = new Whip(beverage2);
+    print(beverage2);
+
+    Beverage beverage3 = new HouseBlend();
+    beverage3 = new Soy(beverage3);
+    beverage3 = new Mocha(beverage3);
+    beverage3 = new Whip(beverage3);
+    print(beverage3);
+}

decorator/coffee/beverage.d

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+module decorator.coffee.beverage;
+
+abstract class Beverage
+{
+protected:
+    string description = "Unknown Beverage";
+public:
+    string getDescription()
+    {
+        return description;
+    }
+
+    double cost();
+}

decorator/coffee/condimentdecorator.d

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+module decorator.coffee.condimentdecorator;
+
+import decorator.coffee.beverage;
+
+abstract class CondimerDecorator : Beverage
+{
+    override string getDescription();
+}

decorator/coffee/darkroast.d

@@ -0,0 +1,16 @@
+module decorator.coffee.darkroast;
+
+import decorator.coffee.beverage;
+
+class DarkRoast : Beverage
+{
+    this()
+    {
+        description = "Dark Roast Coffee";
+    }
+
+    override double cost()
+    {
+        return .99;
+    }
+}

decorator/coffee/decaf.d

@@ -0,0 +1,16 @@
+module decorator.coffee.decaf;
+
+import decorator.coffee.beverage;
+
+class Decaf : Beverage
+{
+    this()
+    {
+        description = "Decaf Coffee";
+    }
+
+    override double cost()
+    {
+        return 1.05;
+    }
+}

decorator/coffee/espresso.d

@@ -0,0 +1,16 @@
+module decorator.coffee.espresso;
+
+import decorator.coffee.beverage;
+
+class Espresso : Beverage
+{
+    this()
+    {
+        description = "Espresso";
+    }
+
+    override double cost()
+    {
+        return 1.99;
+    }
+}

decorator/coffee/houseblend.d

@@ -0,0 +1,16 @@
+module decorator.coffee.houseblend;
+
+import decorator.coffee.beverage;
+
+class HouseBlend : Beverage
+{
+    this()
+    {
+        description = "House Blend Coffee";
+    }
+
+    override double cost()
+    {
+        return .89;
+    }
+}

decorator/coffee/milk.d

@@ -0,0 +1,25 @@
+module decorator.coffee.milk;
+
+import decorator.coffee.beverage;
+import decorator.coffee.condimentdecorator;
+
+class Milk : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Milk";
+    }
+
+    override double cost()
+    {
+        return .10 + beverage.cost();
+    }
+}

decorator/coffee/mocha.d

@@ -0,0 +1,25 @@
+module decorator.coffee.mocha;
+
+import decorator.coffee.beverage;
+import decorator.coffee.condimentdecorator;
+
+class Mocha : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Mocha";
+    }
+
+    override double cost()
+    {
+        return .20 + beverage.cost();
+    }
+}

decorator/coffee/soy.d

@@ -0,0 +1,25 @@
+module decorator.coffee.soy;
+
+import decorator.coffee.beverage;
+import decorator.coffee.condimentdecorator;
+
+class Soy : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Soy";
+    }
+
+    override double cost()
+    {
+        return .15 + beverage.cost();
+    }
+}

decorator/coffee/whip.d

@@ -0,0 +1,25 @@
+module decorator.coffee.whip;
+
+import decorator.coffee.beverage;
+import decorator.coffee.condimentdecorator;
+
+class Whip : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Whip";
+    }
+
+    override double cost()
+    {
+        return .10 + beverage.cost();
+    }
+}

decorator/coffeewithsize/app.d

@@ -0,0 +1,38 @@
+module decorator.coffeewithsize.app;
+
+import decorator.coffeewithsize.beverage;
+import decorator.coffeewithsize.espresso;
+import decorator.coffeewithsize.darkroast;
+import decorator.coffeewithsize.houseblend;
+import decorator.coffeewithsize.decaf;
+import decorator.coffeewithsize.mocha;
+import decorator.coffeewithsize.milk;
+import decorator.coffeewithsize.soy;
+import decorator.coffeewithsize.whip;
+import std.stdio : writeln;
+
+alias Size = Beverage.Size;
+
+void print(Beverage beverage)
+{
+    writeln(beverage.getDescription(), " $", beverage.cost());
+}
+
+void main()
+{
+    Beverage beverage = new Espresso();
+    print(beverage);
+
+    Beverage beverage2 = new DarkRoast();
+    beverage2 = new Mocha(beverage2);
+    beverage2 = new Mocha(beverage2);
+    beverage2 = new Whip(beverage2);
+    print(beverage2);
+
+    Beverage beverage3 = new HouseBlend();
+    beverage3.setSize(Size.VENTI);
+    beverage3 = new Soy(beverage3);
+    beverage3 = new Mocha(beverage3);
+    beverage3 = new Whip(beverage3);
+    print(beverage3);
+}

decorator/coffeewithsize/beverage.d

@@ -0,0 +1,27 @@
+module decorator.coffeewithsize.beverage;
+
+abstract class Beverage
+{
+protected:
+    string description = "Unknown Beverage";
+public:
+    enum Size { TALL, GRANDE, VENTI }
+    Size size = Size.TALL;
+
+    string getDescription()
+    {
+        return description;
+    }
+
+    void setSize(Size size)
+    {
+        this.size = size;
+    }
+
+    Size getSize()
+    {
+        return size;
+    }
+
+    double cost();
+}

decorator/coffeewithsize/condimentdecorator.d

@@ -0,0 +1,8 @@
+module decorator.coffeewithsize.condimentdecorator;
+
+import decorator.coffeewithsize.beverage;
+
+abstract class CondimerDecorator : Beverage
+{
+    override string getDescription();
+}

decorator/coffeewithsize/darkroast.d

@@ -0,0 +1,16 @@
+module decorator.coffeewithsize.darkroast;
+
+import decorator.coffeewithsize.beverage;
+
+class DarkRoast : Beverage
+{
+    this()
+    {
+        description = "Dark Roast Coffee";
+    }
+
+    override double cost()
+    {
+        return .99;
+    }
+}

decorator/coffeewithsize/decaf.d

@@ -0,0 +1,16 @@
+module decorator.coffeewithsize.decaf;
+
+import decorator.coffeewithsize.beverage;
+
+class Decaf : Beverage
+{
+    this()
+    {
+        description = "Decaf Coffee";
+    }
+
+    override double cost()
+    {
+        return 1.05;
+    }
+}

decorator/coffeewithsize/espresso.d

@@ -0,0 +1,16 @@
+module decorator.coffeewithsize.espresso;
+
+import decorator.coffeewithsize.beverage;
+
+class Espresso : Beverage
+{
+    this()
+    {
+        description = "Espresso";
+    }
+
+    override double cost()
+    {
+        return 1.99;
+    }
+}

decorator/coffeewithsize/houseblend.d

@@ -0,0 +1,16 @@
+module decorator.coffeewithsize.houseblend;
+
+import decorator.coffeewithsize.beverage;
+
+class HouseBlend : Beverage
+{
+    this()
+    {
+        description = "House Blend Coffee";
+    }
+
+    override double cost()
+    {
+        return .89;
+    }
+}

decorator/coffeewithsize/milk.d

@@ -0,0 +1,25 @@
+module decorator.coffeewithsize.milk;
+
+import decorator.coffeewithsize.beverage;
+import decorator.coffeewithsize.condimentdecorator;
+
+class Milk : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Milk";
+    }
+
+    override double cost()
+    {
+        return .10 + beverage.cost();
+    }
+}

decorator/coffeewithsize/mocha.d

@@ -0,0 +1,25 @@
+module decorator.coffeewithsize.mocha;
+
+import decorator.coffeewithsize.beverage;
+import decorator.coffeewithsize.condimentdecorator;
+
+class Mocha : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Mocha";
+    }
+
+    override double cost()
+    {
+        return .20 + beverage.cost();
+    }
+}

decorator/coffeewithsize/soy.d

@@ -0,0 +1,38 @@
+module decorator.coffeewithsize.soy;
+
+import decorator.coffeewithsize.beverage;
+import decorator.coffeewithsize.condimentdecorator;
+
+class Soy : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Soy";
+    }
+
+    override double cost()
+    {
+        double cost = beverage.cost();
+		if (beverage.getSize() == Size.TALL)
+        {
+			cost += .10;
+		}
+        else if (beverage.getSize() == Size.GRANDE)
+        {
+			cost += .15;
+		}
+        else if (beverage.getSize() == Size.VENTI)
+        {
+			cost += .20;
+		}
+		return cost;
+    }
+}

decorator/coffeewithsize/whip.d

@@ -0,0 +1,25 @@
+module decorator.coffeewithsize.whip;
+
+import decorator.coffeewithsize.beverage;
+import decorator.coffeewithsize.condimentdecorator;
+
+class Whip : CondimerDecorator
+{
+private:
+    Beverage beverage;
+public:
+    this(Beverage beverage)
+    {
+        this.beverage = beverage;
+    }
+
+    override string getDescription()
+    {
+        return beverage.getDescription() ~ ", Whip";
+    }
+
+    override double cost()
+    {
+        return .10 + beverage.cost();
+    }
+}