public function plus($addSet)
{
$newSet = new self();
foreach ($this->getProcessed() as $key => $value) {
if (!is_scalar($value)) {
continue;
}
$newSet->set($key, $value);
}
if ($addSet instanceof PricingSetInterface) {
foreach ($addSet->getProcessed() as $key => $value) {
if (!is_scalar($value)) {
continue;
}
$total = $this->get($key) + $value;
$newSet->set($key, $total);
}
}
$newSet->setProcessingState(self::PROCESSING_FINISHED);
return $newSet;
}