php设计模式 Builder (建造者模式)

<?php
/**
 * 建造者模式
 *
 * 将一个复杂对象的构建与它的表示分离,使用同样的构建过程可以创建不同的表示
 */
class Product {
    public $_type = null;
    public $_size = null;
    public $_color = null;
    public function setType($type) {
        echo "set product type<br/>";
        $this->_type = $type;
    }
    public function setSize($size) {
        echo "set product size<br/>";
        $this->_size = $size;
    }
    public function setColor($color) {
        echo "set product color<br/>";
        $this->_color = $color;
    }
}
$config = array(
    "type" => "shirt",
    "size" => "xl",
    "color" => "red",
);
// 没有使用bulider以前的处理
$oProduct = new Product();
$oProduct->setType($config['type']);
$oProduct->setSize($config['size']);
$oProduct->setColor($config['color']);
// 创建一个builder类
class ProductBuilder {
    var $_config = null;
    var $_object = null;
    public function ProductBuilder($config) {
        $this->_object = new Product();
        $this->_config = $config;
    }
    public function build() {
        echo "--- in builder---<br/>";
        $this->_object->setType($this->_config['type']);
        $this->_object->setSize($this->_config['size']);
        $this->_object->setColor($this->_config['color']);
    }
    public function getProduct() {
        return $this->_object;
    }
}
$objBuilder = new ProductBuilder($config);
$objBuilder->build();
$objProduct = $objBuilder->getProduct();