创建者

叙述

示例

<?php

/**
* 掌握生产步骤，生产工序(需要哪几步)
*/
class Director {
    public static function buildFood(Builder $builer) {
        $builer->hamburger();
        $builer->drink();
        return $builer;
    }
}

/**
* 某个产品的抽象生产器
* 把具体产品的各个部分的构造方法剥离出来，具体的复杂业务逻辑在具体的构造器子类里处理
*/
abstract class Builder {
    protected $_product = null;

    public function __construct() {
        $this->_product = new Product();
    }

    public abstract function hamburger();
    public abstract function drink();

    public function getProduct() {
        return $this->_product;
    }
}

/**
* 生产儿童套餐
*/
class ChildFoodBuilder extends Builder {

    public function hamburger() {
        $this->_product->add('hamburger', 1);
    }

    public function drink() {
        $this->_product->add('drink', 1);
    }
}


/**
* 生产大人套餐
*/
class AdultFoodBuilder extends Builder {

    public function hamburger() {
        $this->_product->add('hamburger', 2);
    }

    public function drink() {
        $this->_product->add('drink', 2);
    }
}

/**
* 具体的产品，把复杂的构造部分分离到创建者中
*/
class Product {
    private $_hamburger = 0;
    private $_drink = 0;

    public function add($item, $num=1) {
        $name = '_'.$item;
        $this->$name += intval($num);
    }

    public function __toString() {
        return "hamburger: ".$this->_hamburger.", drink:".$this->_drink."\n";
    }
}

/**
* 客户需要一个可创建者(要创建什么东西)和一个导演(指导书),让创建者按照指导书去创建产品
*
* 如果产品的建造很复杂，那么请用工厂模式；如果产品的建造更复杂，那么请用建造者模式
*/
class Client {
    public static function main() {

        //$childBuilder = new ChildFoodBuilder();
        $food = Director::buildFood(new ChildFoodBuilder())->getProduct();
        echo $food;

        //$adultFoodBuilder = new AdultFoodBuilder();
        $food = Director::buildFood(new AdultFoodBuilder())->getProduct();
        echo $food;
    }
}

Client::main();