public function setItemType($itemType = null)
{
// validation for constraint: enumeration
if (!\Api\EnumType\ApiItemType::valueIsValid($itemType)) {
throw new \InvalidArgumentException(sprintf('Value "%s" is invalid, please use one of: %s', $itemType, implode(', ', \Api\EnumType\ApiItemType::getValidValues())), __LINE__);
}
$this->itemType = $itemType;
return $this;
}