VirtueMart Forum
VirtueMart Dev/Coding Central: VM1 (old version) => Development Projects, Modifications, Hacks & Tweaks. VM1.1 => Topic started by: duccio on January 06, 2012, 18:42:50 pm
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Hi, I made some changes to the VirtueMartCart class and the VirtueMartCart::getCart() to implement the Dependency Injection pattern, so that if somebody wants to extend the cart helper to add or change some behaviors, he just needs to do:
class MyCart extendes VirtueMartCart {
// new or overloaded functions here
}
VirtueMartCart::setCartClass('MyCart');
$cart = VirtueMartCart::getCart();
/* $cart instanceof MyCart */
I believe it could be useful to some people, and it's small enough that could also be included in the standard distribution.
Duccio
(Code also in file attached)
/*
*
* Overcomes the lack of Late State Binding in PHP <5.3
*
* Needs to be added to helpers/cart.php
*
*/
//Beginning of helpers/cart.php or other Exception file
class VirtueMart_Helper_Cart_Exception extends Exception {}
class VirtueMartCart {
private static $_cartClass = 'VirtueMartCart';
/* Other variables and functions */
/**
* Set the name of the class instantiated by getCart
*
* Example
*
* class MyCartClass extends VirtueMartCart {
* // my code here
* }
*
* VirtueMartCart::setCartClass('MyCartClass'); //Or MyCartClass::setCartClass('MyCartClass');
* $cart = VirtueCartClass::getCart(); //Or MyCartClass::getCart();
*
* @param unknown_type $class
* @throws Exception
* @author Duccio Gasparri
*/
public static function setCartClass($class = 'VirtueMartCart', $exceptionIfDifferent = true)
{
if(is_string($class))
self::$_cartClass = $class;
elseif(is_object($class))
self::$_cartClass = get_class($class);
else
throw new VirtueMart_Helper_Cart_Exception('Parameter $class must be string or object, '.gettype($class).' provided.');
if($exceptionIfDifferent && is_object(self::$_cart) && self::$_cartClass != get_class(self::$_cart))
throw new VirtueMart_Helper_Cart_Exception('Cart object already exists of class '.get_class(self::$_cart));
}
/**
* Get the name of the class instantiated by getCart
*
* @return string
* @author Duccio Gasparri
*/
public static function getCartClass()
{
return self::$_cartClass;
}
// and in function getCart(...)
public static function getCart($deleteValidation=true,$setCart=true, $options = array()) {
/* ... other code ... */
//Comment here
//self::$_cart = new VirtueMartCart;
self::$_cart = new self::$_cartClass; //<-- CHANGE HERE
/* ... other code */
// Comment here
//self::$_cart = new VirtueMartCart;
self::$_cart = new self::$_cartClass; //<-- CHANGE HERE
}
}
[attachment cleanup by admin]
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interesting