ResourceLoader.php

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<?php
namespace Magento\Framework\Acl\Loader;

use Magento\Framework\Acl;
use Magento\Framework\Acl\AclResource as AclResource;
use Magento\Framework\Acl\AclResource\ProviderInterface;
use Magento\Framework\Acl\AclResourceFactory;

class ResourceLoader implements \Magento\Framework\Acl\LoaderInterface
{
    protected $_resourceProvider;

    protected $_resourceFactory;

    public function __construct(ProviderInterface $resourceProvider, AclResourceFactory $resourceFactory)
    {
        $this->_resourceProvider = $resourceProvider;
        $this->_resourceFactory = $resourceFactory;
    }

    public function populateAcl(Acl $acl)
    {
        $this->_addResourceTree($acl, $this->_resourceProvider->getAclResources(), null);
    }

    protected function _addResourceTree(Acl $acl, array $resources, AclResource $parent = null)
    {
        foreach ($resources as $resourceConfig) {
            if (!isset($resourceConfig['id'])) {
                throw new \InvalidArgumentException('Missing ACL resource identifier');
            }
            $resource = $this->_resourceFactory->createResource(['resourceId' => $resourceConfig['id']]);
            $acl->addResource($resource, $parent);
            if (isset($resourceConfig['children'])) {
                $this->_addResourceTree($acl, $resourceConfig['children'], $resource);
            }
        }
    }
}