simple remote command

command/simpleremotecontrol/app.d

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+module command.simpleremotecontrol.app;
+
+import command.simpleremotecontrol.simpleremotecontrol;
+import command.simpleremotecontrol.lightoncommand;
+import command.simpleremotecontrol.lightoffcommand;
+import command.simpleremotecontrol.light;
+import command.simpleremotecontrol.garagedooropencommand;
+import command.simpleremotecontrol.garagedoor;
+
+void main()
+{
+    auto remote = new SimpleRemoteControl();
+    auto light = new Light();
+    auto lightOn = new LightOnCommand(light);
+    auto lightOff = new LightOffCommand(light);
+    auto garageDoor = new GarageDoor();
+    auto garageDoorOpen = new GarageDoorOpenCommand(garageDoor);
+
+    remote.setCommand(lightOn);
+    remote.buttonWasPressed();
+    remote.setCommand(lightOff);
+    remote.buttonWasPressed();
+    remote.setCommand(garageDoorOpen);
+    remote.buttonWasPressed();
+}

command/simpleremotecontrol/command.d

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+module command.simpleremotecontrol.command;
+
+interface Command
+{
+    void execute();
+}

command/simpleremotecontrol/garagedoor.d

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+module command.simpleremotecontrol.garagedoor;
+
+import std.stdio : writeln;
+
+class GarageDoor
+{
+    void up()
+    {
+        writeln("Garage Door is Open");
+    }
+
+    void down()
+    {
+        writeln("Garage Door is Closed");
+    }
+
+    void stop()
+    {
+        writeln("Garage Door is Stopped");
+    }
+
+    void lightOn()
+    {
+        writeln("Garage light is on");
+    }
+
+    void lightOff()
+    {
+        writeln("Garage light is off");
+    }
+}

command/simpleremotecontrol/garagedooropencommand.d

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+module command.simpleremotecontrol.garagedooropencommand;
+
+import command.simpleremotecontrol.command;
+import command.simpleremotecontrol.garagedoor;
+
+class GarageDoorOpenCommand : Command
+{
+    GarageDoor garageDoor;
+
+    this(GarageDoor garageDoor)
+    {
+        this.garageDoor = garageDoor;
+    }
+
+    override void execute()
+    {
+        garageDoor.up();
+    }
+}

command/simpleremotecontrol/light.d

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+module command.simpleremotecontrol.light;
+
+import std.stdio : writeln;
+
+class Light
+{
+    void on()
+    {
+        writeln("Light is On");
+    }
+
+    void off()
+    {
+        writeln("Light is Off");
+    }
+}

command/simpleremotecontrol/lightoffcommand.d

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+module command.simpleremotecontrol.lightoffcommand;
+
+import command.simpleremotecontrol.command;
+import command.simpleremotecontrol.light;
+
+class LightOffCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    override void execute()
+    {
+        light.off();
+    }
+}

command/simpleremotecontrol/lightoncommand.d

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+module command.simpleremotecontrol.lightoncommand;
+
+import command.simpleremotecontrol.command;
+import command.simpleremotecontrol.light;
+
+class LightOnCommand : Command
+{
+    Light light;
+
+    this(Light light)
+    {
+        this.light = light;
+    }
+
+    override void execute()
+    {
+        light.on();
+    }
+}

command/simpleremotecontrol/simpleremotecontrol.d

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+module command.simpleremotecontrol.simpleremotecontrol;
+
+import command.simpleremotecontrol.command;
+
+class SimpleRemoteControl
+{
+    Command slot;
+
+    void setCommand(Command command)
+    {
+        slot = command;
+    }
+
+    void buttonWasPressed()
+    {
+        slot.execute();
+    }
+}