Main.php

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<?php
namespace Magento\Review\Block\Adminhtml;

class Main extends \Magento\Backend\Block\Widget\Grid\Container
{
    protected $_coreRegistry = null;

    protected $customerRepository;

    protected $_productFactory;

    protected $_customerViewHelper;

    public function __construct(
        \Magento\Backend\Block\Widget\Context $context,
        \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository,
        \Magento\Catalog\Model\ProductFactory $productFactory,
        \Magento\Framework\Registry $registry,
        \Magento\Customer\Helper\View $customerViewHelper,
        array $data = []
    ) {
        $this->_coreRegistry = $registry;
        $this->customerRepository = $customerRepository;
        $this->_productFactory = $productFactory;
        $this->_customerViewHelper = $customerViewHelper;
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        $this->_addButtonLabel = __('New Review');
        parent::_construct();

        $this->_blockGroup = 'Magento_Review';
        $this->_controller = 'adminhtml';

        // lookup customer, if id is specified
        $customerId = $this->getRequest()->getParam('customerId', false);
        $customerName = '';
        if ($customerId) {
            $customer = $this->customerRepository->getById($customerId);
            $customerName = $this->escapeHtml($this->_customerViewHelper->getCustomerName($customer));
        }
        $productId = $this->getRequest()->getParam('productId', false);
        $productName = null;
        if ($productId) {
            $product = $this->_productFactory->create()->load($productId);
            $productName = $this->escapeHtml($product->getName());
        }

        if ($this->_coreRegistry->registry('usePendingFilter') === true) {
            if ($customerName) {
                $this->_headerText = __('Pending Reviews of Customer `%1`', $customerName);
            } else {
                $this->_headerText = __('Pending Reviews');
            }
            $this->buttonList->remove('add');
        } else {
            if ($customerName) {
                $this->_headerText = __('All Reviews of Customer `%1`', $customerName);
            } elseif ($productName) {
                $this->_headerText = __('All Reviews of Product `%1`', $productName);
            } else {
                $this->_headerText = __('All Reviews');
            }
        }
    }
}