装饰器模式
角色分析
1、抽象构件角色
定义一个对象接口，以规范准备接受附件职责的对象，从而可以给这些对象动态的添加职责
2、具体构件角色
定义一个即将要接受附加职责的类
3、装饰角色
持有一个纸箱Componnet对象的指针，并定义一个与Component接口一致的接口。
4、具体装饰角色
负责给构件对象增加附加的职责。
<?php
//抽象构件角色
interface Component
{
public function operation();
}
//具体构件角色
class ConcreComponent implements Component
{
public function operation()
{
echo "Concrete Component operation";
}
}
//装饰角色
abstract class Decorator implements Component
{
protected $_component;
public function __construct(Component $component)
{
$this->_component = $component;
}
public function operation()
{
$this->_component->operation();
}
}
//具体装饰角色
class ConcreteDecoratorA extends Decorator
{
public function __construct(Component $component)
{
parent::__construct($component);
}
public function operation()
{
parent::operation(); // TODO: Change the autogenerated stub
$this->addOperationA();
}
public function addOperationA()
{
echo "add operation A";
}
}
class ConcreteDecoratorB extends Decorator
{
public function __construct(Component $component)
{
parent::__construct($component);
}
public function operation()
{
parent::operation(); // TODO: Change the autogenerated stub
$this->addOperationB();
}
public function addOperationB()
{
echo "add operation B";
}
}
$component = new ConcreComponent();
$decoratorA = new ConcreteDecoratorA($component);
$decoratorB = new ConcreteDecoratorB($component);
$decoratorA->operation();
$decoratorB->operation();
?>
