php 实现设计模式之 建造者模式
?php /** * 建造者模式 * ------------- * 定义:将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示。 * 类型:创建类模式 * 四个要素: * 1:产品类:一般是一个较为复杂的对象 * 2:抽象建造者:提取出复杂产品类的构造。一般至
<?php /** * 建造者模式 * ------------- * 定义:将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示。 * 类型:创建类模式 * 四个要素: * 1:产品类:一般是一个较为复杂的对象 * 2:抽象建造者:提取出复杂产品类的构造。一般至少会有两个抽象方法,一个用来建造产品,一个是用来返回产品。 * 3:建造者:实现抽象类的所有未实现的方法,具体来说一般是两项任务:组建产品;返回组建好的产品。 * 4:导演类:负责调用适当的建造者来组建产品 */ //复杂产品类 class Car{ private $name; private $type; private $price; private $color; public function setName($name){ $this->name = $name; } public function setType($type){ $this->type = $type; } public function setPrice($price){ $this->price = $price; } public function setColor($color){ $this->color = $color; } public function show(){ echo $this->name.': '.$this->type.' '.$this->color.' '.$this->price; echo "<br>"; } } //抽象其创建过程,可用于不同对象创建 interface Bulider{ public function createType($type); public function createName($name); public function createColor($color); public function createPrice($price); public function createCar(); } class ConcreteBulider implements Bulider{//包含一个复杂对象 public $car; public function __construct(){ $this->car = new Car(); } public function createType($type){ $this->car->setType($type); } public function createColor($color){ $this->car->setColor($color); } public function createName($name){ $this->car->setName($name); } public function createPrice($price){ $this->car->setPrice($price); } public function createCar(){ return $this->car; } } //封装易变的部分,比如顺序、属性 class Derictor{ public function __construct(ConcreteBulider $bulider){ $bulider->createColor('红色'); $bulider->createName('宝马'); $bulider->createPrice('150万'); $bulider->createType('SUV'); } } class Client{ public static function main(){ //创建一个建造者,导演类利用其创建对象 $bulider = new ConcreteBulider(); $derictor = new Derictor($bulider); $car = $bulider->createCar(); $car->show(); } } Client::main(); ?>
UML类图如下:
建造者模式 是创建型模式,用于创建比产品族 还复杂的对象。首先 前提是有一个复杂对象,抽象出复杂对象的创建过程,用于创建其他对象。
写法:建造者包含一个 复杂对象,利用复杂对象的构件过程。。 导演类用于创建对象,包含一个建造者对象。

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