CBPDocumentService::getDocumentType

public function getDocumentType($parameterDocumentId)
{
	[$moduleId, $entity, $documentId] = CBPHelper::ParseDocumentId($parameterDocumentId);

	$k = $moduleId."@".$entity."@".$documentId;
	if (isset($this->documentTypesCache[$k]))
		return $this->documentTypesCache[$k];

	if ($moduleId)
	{
		CModule::IncludeModule($moduleId);
	}

	if (class_exists($entity) && method_exists($entity, "GetDocumentType"))
	{
		$this->documentTypesCache[$k] = [$moduleId, $entity, call_user_func_array([$entity, "GetDocumentType"], [$documentId])];
		return $this->documentTypesCache[$k];
	}

	return null;
}