《PHP學(xué)習(xí)：PHP設(shè)計(jì)模式之裝飾者模式代碼實(shí)例》要點(diǎn)：
本文介紹了PHP學(xué)習(xí)：PHP設(shè)計(jì)模式之裝飾者模式代碼實(shí)例，希望對(duì)您有用。如果有疑問(wèn)，可以聯(lián)系我們。
界說(shuō)：PHP編程
裝飾者模式就是不修改原類代碼和繼承的情況下動(dòng)態(tài)擴(kuò)展類的功能.傳統(tǒng)的編程模式都是子類繼承父類實(shí)現(xiàn)辦法重載,使用裝飾器模式,只需添加一個(gè)新的裝飾器對(duì)象,更加靈活,避免類數(shù)量和層次過(guò)多.PHP編程
腳色：PHP編程
Component(被裝飾工具基類)
ConcreteComponent(具體被裝飾工具)
Decorator(裝飾者基類)
ContreteDecorator(具體的裝飾者類)PHP編程
示例代碼：PHP編程
//被裝飾者基類
interface Component
{
public function operation();
}
//裝飾者基類
abstract class Decorator implements Component
{
protected $component;
public function __construct(Component $component)
{
$this->component = $component;
}
public function operation()
{
$this->component->operation();
}
}
//詳細(xì)裝飾者類
class ConcreteComponent implements Component
{
public function operation()
{
echo 'do operation'.PHP_EOL;
}
}
//詳細(xì)裝飾類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;
}
}
//詳細(xì)裝飾類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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