CBPDocumentService::getDocument

public function getDocument($parameterDocumentId, $parameterDocumentType = null)
{
	$this->checkCache();
	[$moduleId, $entity, $documentId] = CBPHelper::ParseDocumentId($parameterDocumentId);

	$documentType = ($parameterDocumentType && is_array($parameterDocumentType)) ? $parameterDocumentType[2] : null;

	$k = $moduleId."@".$entity."@".$documentId.($documentType ? '@'.$documentType : '');
	if (array_key_exists($k, $this->arDocumentsCache))
	{
		return $this->arDocumentsCache[$k];
	}

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

	if (class_exists($entity) && method_exists($entity, 'GetDocument'))
	{
		$this->arDocumentsCache[$k] = call_user_func_array([$entity, "GetDocument"], [$documentId, $documentType]);
		return $this->arDocumentsCache[$k];
	}

	return null;
}