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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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