structure.php

См. документацию.

<?php
 
namespace Bitrix\Calendar\Integration\HumanResources;
 
use Bitrix\HumanResources;
use Bitrix\Main\Loader;
 
final class Structure
{
    private const INITIAL_ROOT_DEPARTMENT_ID = -1;
    private static ?int $rootDepartmentId = self::INITIAL_ROOT_DEPARTMENT_ID;
 
    private static ?self $instance;
 
    public static function getInstance(): self
    {
        self::$instance ??= new self();
 
        return self::$instance;
    }
 
    public function getRootDepartmentId(): ?int
    {
        if (self::$rootDepartmentId === self::INITIAL_ROOT_DEPARTMENT_ID)
        {
            self::$rootDepartmentId = $this->loadRootDepartmentId();
        }
 
        return self::$rootDepartmentId;
    }
 
    private function loadRootDepartmentId(): ?int
    {
        if (!Loader::includeModule('humanresources'))
        {
            return null;
        }
 
        $structure = (new HumanResources\Repository\StructureRepository())->getByXmlId(
            HumanResources\Item\Structure::DEFAULT_STRUCTURE_XML_ID,
        );
 
        if (!isset($structure))
        {
            return null;
        }
 
        $rootNode = (new HumanResources\Repository\NodeRepository())->getRootNodeByStructureId($structure->id);
        if (!isset($rootNode))
        {
            return null;
        }
 
        preg_match('/D(\d+)/', $rootNode->accessCode ?? '', $matches);
 
        if (empty($matches[1]))
        {
            return null;
        }
 
        return (int)$matches[1];
    }
}