Merge pull request mouredev#6320 from martinbohorquez/java#24

#24 java

Author: kontroldev

Roadmap/24 - DECORADORES/java/martinbohorquez.java

@@ -0,0 +1,137 @@
+/*
+ * #24 PATRONES DE DISEÑO: DECORADORES
+ *
+ * @author martinbohorquez
+ */
+public class martinbohorquez {
+    public static void main(String[] args) {
+        Component component = new ConcreteComponent();
+        Component smsConcreteDecorated = new SmsDecorator(component);
+        Component facebookConcreteDecorated = new FacebookDecorator(component);
+        component.notification();
+        smsConcreteDecorated.notification();
+        facebookConcreteDecorated.notification();
+
+        /*
+         * DIFICULTAD EXTRA
+         */
+        ComponentExtra componente = new ConcreteComponentExtra();
+        CountDecorator contadorDecorador = new CountDecorator(componente);
+
+        contadorDecorador.operation();
+        contadorDecorador.operation();
+        contadorDecorador.operation();
+
+        System.out.printf("Total de invocaciones: %s%n", contadorDecorador.getContador());
+    }
+
+    //Interfaz base
+    interface Component {
+        void notification();
+    }
+
+    //Componente concreto
+    static class ConcreteComponent implements Component {
+        @Override
+        public void notification() {
+            System.out.println("Notificación por defecto!");
+        }
+    }
+
+    //Decorador abstracto
+    abstract static class Decorator implements Component {
+        private final Component component;
+
+        private Decorator(Component component) {
+            this.component = component;
+        }
+
+        public void notification() {
+            this.component.notification();
+            System.out.printf("Notificación por %s!%n", this.getClass().getSimpleName());
+        }
+    }
+
+    //Decorador concreto que añade funcionalidad
+    static class SmsDecorator extends Decorator {
+        private SmsDecorator(Component component) {
+            super(component);
+        }
+
+        @Override
+        public void notification() {
+            super.notification();
+            addFunctionality();
+        }
+
+        private void addFunctionality() {
+            System.out.printf("Funcionalidad adicional de %s!%n", this.getClass().getSimpleName());
+        }
+    }
+
+    //Decorador concreto que añade funcionalidad
+    static class FacebookDecorator extends Decorator {
+        private FacebookDecorator(Component component) {
+            super(component);
+        }
+
+        @Override
+        public void notification() {
+            super.notification();
+            addFunctionality();
+        }
+
+        private void addFunctionality() {
+            System.out.printf("Funcionalidad adicional de %s!%n", this.getClass().getSimpleName());
+        }
+    }
+
+    // DIFICULTAD EXTRA
+    interface ComponentExtra {
+        void operation();
+    }
+
+    //Componente concreto
+    static class ConcreteComponentExtra implements ComponentExtra {
+        @Override
+        public void operation() {
+            System.out.println("Ejecutando operación base!");
+        }
+    }
+
+    //Decorador abstracto
+    abstract static class DecoratorExtra implements ComponentExtra {
+        private final ComponentExtra component;
+
+        private DecoratorExtra(ComponentExtra component) {
+            this.component = component;
+        }
+
+        public void operation() {
+            this.component.operation();
+        }
+    }
+
+    // Decorador concreto que cuenta las veces que se llama a la operación
+    static class CountDecorator extends DecoratorExtra {
+        private int contador = 0;
+
+        private CountDecorator(ComponentExtra component) {
+            super(component);
+        }
+
+        @Override
+        public void operation() {
+            System.out.println("La operación se ha llamado " + ++contador + " vez/veces.");
+            super.operation();
+        }
+
+        private int getContador() {
+            return contador;
+        }
+    }
+}
+
+
+
+