ExportPattern::proccess

public function proccess(array $fields)
{
	$r = $this->getItems($fields);
	if(!$r->isSuccess())
		return $r;

	$entityItems = $r->getData();
	$r = $this->convert($entityItems);
	if(!$r->isSuccess())
		return $r;

	$documents = $r->getData();
	$r = $this->export($documents);

	$this->logger($entityItems);

	return $r;
}