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PHP设计模式之装!饰者模式代码实例

2019-11-02 15:38:22
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   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:

  ?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 //被装饰者基类 interface Component { public function operation(); }   //装饰者基类 abstract class Decorator implements Comp
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onent { 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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