EmptyGroupCategory.php

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<?php
namespace Magento\Store\Model\Message;

use Magento\Framework\UrlInterface;
use Magento\Store\Api\Data\GroupInterface;
use Magento\Store\Model\ResourceModel\Group\Collection as GroupCollection;

class EmptyGroupCategory implements \Magento\Framework\Notification\MessageInterface
{
    private $collection;

    private $urlBuilder;

    private $items = null;

    public function __construct(
        GroupCollection $collection,
        UrlInterface $urlBuilder
    ) {
        $this->collection = $collection;
        $this->urlBuilder = $urlBuilder;
    }

    public function isDisplayed()
    {
        return !empty($this->getItems());
    }

    public function getIdentity()
    {
        return 'empty_assigned_group_category';
    }

    public function getText()
    {
        $items = $this->getItems();
        $groupLinks = [];
        foreach ($items as $group) {
            $groupUrl = $this->urlBuilder->getUrl('adminhtml/system_store/editGroup', ['group_id' => $group->getId()]);
            $groupLinks[] = sprintf('<a href="%s">%s</a>', $groupUrl, $group->getName());
        }
        return __(
            'The following stores are not associated with a root category: '
            . implode(', ', $groupLinks) . '. For the store to be displayed in the storefront, '
            . 'it must be associated with a root category.'
        );
    }

    public function getSeverity()
    {
        return self::SEVERITY_MAJOR;
    }

    private function getItems()
    {
        if (null === $this->items) {
            $this->items = $this->collection->setWithoutAssignedCategoryFilter()->getItems();
        }
        return $this->items;
    }
}