PHP设计模式之装饰者模式代码实例
这篇文章主要介绍了PHP设计模式之装饰者模式代码实例,装饰者模式就是不修改原类代码和继承的情况下动态扩展类的功能,本文就给出了代码实例,需要的朋友可以参考下
定义：
装饰者模式就是不修改原类代码和继承的情况下动态扩展类的功能。传统的编程模式都是子类继承父类实现方法重载，使用装饰器模式，只需添加一个新的装饰器对象，更加灵活，避免类数量和层次过多。
角色：
Component(被装饰对象基类)
ConcreteComponent(具体被装饰对象)
Decorator(装饰者基类)
ContreteDecorator(具体的装饰者类)
示例代码：
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//被装饰者基类 interface Component { public function operation(); }
//装饰者基类 abstract class Decorator implements Component { protected $component;
public function __construct(Component $component) { $this->component = $component; }
public function operation() { $this->component->operation(); } }
//具体装饰者类 class ConcreteComponent implements Component { public function operation() { echo 'do operation'.PHP_EOL; } }
//具体装饰类A class ConcreteDecoratorA extends Decorator { public function __construct(Component $component) { parent::__construct($component);
}
public function operation() { parent::operation(); $this->addedOperationA(); // 新增加的操作 }
public function addedOperationA() { echo 'Add Operation A '.PHP_EOL; } }
//具体装饰类B class ConcreteDecoratorB extends Decorator { public function __construct(Component $component) { parent::__construct($component);
}
public function operation() { parent::operation(); $this->addedOperationB(); }
public function addedOperationB() { echo 'Add Operation B '.PHP_EOL; } }
class Client {
public static function main() { /* do operation Add Operation A */ $decoratorA = new ConcreteDecoratorA(new ConcreteComponent()); $decoratorA->operation();
/* do operation Add Operation A Add Operation B */ $decoratorB = new ConcreteDecoratorB($decoratorA); $decoratorB->operation(); }
}
Client::main(); |
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