protected function checkClassFileName()
{
$fileName = str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', get_class($this->_mageModel)))) . '.php';
$this->_fileName = $this->searchFullPath($fileName);
if (false === $this->_fileName) {
throw new InvalidArgumentException('File not found: ' . $this->_fileName);
}
}