学习php设计模式 php实现装饰器模式(decorator)

<?php
/
  抽象构件角色
 /
interface Component {
 /
   示例方法
  /
 public function operation();
}
 
/
  装饰角色
 /
abstract class Decorator implements Component{
 
 protected $_ponent;
 
 public function __construct(Component $ponent) {
  $this->_ponent = $ponent;
 }
 
 public function operation() {
  $this->_ponent->operation();
 }
}
 
/
  具体装饰类A
 /
class ConcreteDecoratorA extends Decorator {
 public function __construct(Component $ponent) {
  parent::__construct($ponent);
 
 }
 
 public function operation() {
  parent::operation(); // 调用装饰类的操作
  $this->addedOperationA(); // 新增加的操作
 }
 
 /
   新增加的操作A，即装饰上的功能
  /
 public function addedOperationA() {
  echo 'Add Operation A <br />';
 }
}
 
/
  具体装饰类B
 /
class ConcreteDecoratorB extends Decorator {
 public function __construct(Component $ponent) {
  parent::__construct($ponent);
 
 }
 
 public function operation() {
  parent::operation();
  $this->addedOperationB();
 }
 
 /
   新增加的操作B，即装饰上的功能
  /
 public function addedOperationB() {
  echo 'Add Operation B <br />';
 }
}
 
/
  具体构件
 /
class ConcreteComponent implements Component{
 
 public function operation() {
  echo 'Concrete Component operation <br />';
 }
 
}
 
/
  客户端
 /
class Client {
 
  /
   Main program.
  /
 public static function main() {
  $ponent = new ConcreteComponent();
  $decoratorA = new ConcreteDecoratorA($ponent);
  $decoratorB = new ConcreteDecoratorB($decoratorA);
 
  $decoratorA->operation();
  $decoratorB->operation();
 }
 
}
 
Client::main();
?>