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();