//装饰模式
//CopyRight(C) CAnca software Office.2006
//Created by CAnca.

public class DecoratorMode{
 public static void main(String[] args){
  Component component = new ConcreteComponent();
  Decorator decoratorA = new ConcreteDecoratorA();
  Decorator decoratorB = new ConcreteDecoratorB();
  decoratorA.setComponent(component);
  decoratorB.setComponent(decoratorA);
  decoratorB.Operation();
  //decoratorA.Operation();
 }
}

abstract class Component{
 abstract void Operation();
}

class ConcreteComponent extends Component{
 public void Operation(){
  System.out.println("ConcreteComponent.Component()");
 }
}

abstract class Decorator extends Component{
 protected Component component;
 public void setComponent(Component component){
  this.component = component;
 }
 public void Operation(){
  if(this.component != null){
   component.Operation();
  }
 }
}

class ConcreteDecoratorA extends Decorator{
 private String newState = null;
 public void Operation(){
  super.Operation();
  newState = "New State.";
  System.out.println("ConcreteDecoratorA.Operation():" + newState);
 } 
}

class ConcreteDecoratorB extends Decorator{
 public void Operation(){
  super.Operation();
  newPrint();
 }
 
 public void newPrint(){
  System.out.println("ConcreteDecoratorB.Operation()");
 }
}