Merge pull request #21 from darbyluv2code/feature/add-macro-command

Add MacroCommand demo to Command Pattern

Author: darbyluv2code

section-04-behavioral-design-patterns/16-command/src/main/java/com/luv2code/designpatterns/behavioral/command/MacroCommand.java

@@ -0,0 +1,45 @@
+package com.luv2code.designpatterns.behavioral.command;
+
+import java.util.List;
+
+/**
+ * Role: ConcreteCommand (Macro)
+ *
+ * Groups a list of commands into a single named scene.
+ * Execute runs all commands in order.
+ * Undo runs them in reverse order.
+ */
+public class MacroCommand implements SmartHomeCommand {
+
+    private String name;
+    private List<SmartHomeCommand> commands;
+
+    public MacroCommand(String name, List<SmartHomeCommand> commands) {
+        this.name = name;
+        this.commands = commands;
+    }
+
+    @Override
+    public void execute() {
+        System.out.println("[Macro] Running: " + name);
+
+        for (SmartHomeCommand command : commands) {
+            command.execute();
+        }
+    }
+
+    @Override
+    public void undo() {
+        // go in reverse order
+        System.out.println("[Macro] Running: " + name);
+
+        for (int i = commands.size() -1; i >= 0; i--) {
+            commands.get(i).undo();
+        }
+    }
+
+    @Override
+    public String getDescription() {
+        return "Macro: " + name;
+    }
+}

section-04-behavioral-design-patterns/16-command/src/main/java/com/luv2code/designpatterns/behavioral/command/MainApp.java

@@ -1,5 +1,7 @@
 package com.luv2code.designpatterns.behavioral.command;
 
+import java.util.List;
+
 /**
  * Role: Client
  *
@@ -18,8 +20,34 @@ static void main() {
 
         System.out.println("\n--- Demo 3: Pet Food Demo ---");
         runPetFoodDemo();
+
+        System.out.println("\n--- Demo 4: Macro Command Demo ---");
+        runMacroCommandDemo();
     }
 
+    private static void runMacroCommandDemo() {
+
+        Light officeLight = new Light("Office");
+        Light bedroomLight = new Light("Bedroom");
+        Thermostat thermostat = new Thermostat(16);
+        RemoteControl remoteControl = new RemoteControl();
+
+        // Build a "Good Morning" scene - one button press runs all three commands
+        SmartHomeCommand goodMorningCommand = new MacroCommand("Good Morning",
+                List.of(new LightOnCommand(officeLight),
+                        new LightOnCommand(bedroomLight),
+                        new ThermostatSetCommand(thermostat, 21)
+                ));
+
+        remoteControl.pressButton(goodMorningCommand);
+
+        System.out.println("\n-- Undoing the entire scene with one press --");
+        remoteControl.pressUndo();
+    }
+
+
+
+
     private static void runPetFoodDemo() {
 
         PetFoodDispenser petFoodDispenser = new PetFoodDispenser("Max");