/**
* Add a product or calculated charge as a line to invoice
* @throws Am_Exception_InvalidRequest if items is incompatible
* @return Invoice provides fluent interface
*/
function add(IProduct $product, $qty = 1)
{
$item = $this->findItem($product->getType(), $product->getProductId());
if (null == $item) {
$item = $this->createItem($product);
$error = $this->isItemCompatible($item);
if (null != $error) {
throw new Am_Exception_InputError($error);
}
$this->_items[] = $item;
}
$item->add($qty);
return $this;
}
/**
* Add a product or calculated charge as a line to invoice
* @throws Am_Exception_InvalidRequest if items is incompatible
* @return Invoice provides fluent interface
*/
function add(IProduct $product, $qty = 1)
{
$item = $this->findItem($product->getType(), $product->getProductId(), $product->getBillingPlanId());
if (null == $item) {
$item = $this->createItem($product);
$error = $this->isItemCompatible($item);
if (null != $error) {
throw new Am_Exception_InputError($error);
}
$this->addItem($item);
}
if (!$item->variable_qty) {
$qty = $product->getQty();
}
// get default qty
$item->add($qty);
return $this;
}