[Decorator] Added pattern clases

src/decorator/pattern/Client.java

@@ -0,0 +1,17 @@
+package decorator.pattern;
+
+/**
+ * Created by luisburgos on 11/08/15.
+ */
+public class Client {
+
+    public static void main(String[] args) {
+
+        Component component = new ConcreteDecoratorOne(new ConcreteComponent());
+        component.doOperation();
+        System.out.println("Adding concrete component two...");
+        component = new ConcreteDecoratorOne(new ConcreteDecoratorTwo(new ConcreteComponent()));
+        component.doOperation();
+    }
+
+}

src/decorator/pattern/Component.java

@@ -0,0 +1,8 @@
+package decorator.pattern;
+
+/**
+ * Created by luisburgos on 11/08/15.
+ */
+public interface Component {
+    public void doOperation();
+}

src/decorator/pattern/ConcreteComponent.java

@@ -0,0 +1,13 @@
+package decorator.pattern;
+
+/**
+ * Created by luisburgos on 11/08/15.
+ */
+public class ConcreteComponent implements Component {
+
+    @Override
+    public void doOperation() {
+        System.out.println("Concrete Component doing operation");
+    }
+
+}

src/decorator/pattern/ConcreteDecoratorOne.java

@@ -0,0 +1,22 @@
+package decorator.pattern;
+
+/**
+ * Created by luisburgos on 11/08/15.
+ */
+public class ConcreteDecoratorOne extends Decorator {
+
+    public ConcreteDecoratorOne(Component component) {
+        super(component);
+    }
+
+    @Override
+    public void doOperation() {
+        super.doOperation();
+        doAdditionalOperation();
+    }
+
+    public void doAdditionalOperation() {
+        System.out.println("Doing additional operation concrete decorator ONE.");
+    }
+
+}

src/decorator/pattern/ConcreteDecoratorTwo.java

@@ -0,0 +1,22 @@
+package decorator.pattern;
+
+/**
+ * Created by luisburgos on 11/08/15.
+ */
+public class ConcreteDecoratorTwo extends Decorator{
+
+    public ConcreteDecoratorTwo(Component component) {
+        super(component);
+    }
+
+    @Override
+    public void doOperation() {
+        super.doOperation();
+        doAdditionalOperation();
+    }
+
+    public void doAdditionalOperation() {
+        System.out.println("Doing additional operation concrete decorator TWO.");
+    }
+
+}

src/decorator/pattern/Decorator.java

@@ -0,0 +1,18 @@
+package decorator.pattern;
+
+/**
+ * Created by luisburgos on 11/08/15.
+ */
+public abstract class Decorator implements Component {
+
+    protected Component component;
+
+    public Decorator(Component component){
+        this.component = component;
+    }
+
+    @Override
+    public void doOperation() {
+        component.doOperation();
+    }
+}