View.php

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

use Magento\Catalog\Model\Product;
use Magento\Review\Model\ResourceModel\Rating\Option\Vote\Collection as VoteCollection;
use Magento\Review\Model\Review;

class View extends \Magento\Catalog\Block\Product\AbstractProduct
{
    protected $_template = 'Magento_Review::customer/view.phtml';

    protected $productRepository;

    protected $_reviewFactory;

    protected $_voteFactory;

    protected $_ratingFactory;

    protected $currentCustomer;

    public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\Review\Model\ReviewFactory $reviewFactory,
        \Magento\Review\Model\Rating\Option\VoteFactory $voteFactory,
        \Magento\Review\Model\RatingFactory $ratingFactory,
        \Magento\Customer\Helper\Session\CurrentCustomer $currentCustomer,
        array $data = []
    ) {
        $this->productRepository = $productRepository;
        $this->_reviewFactory = $reviewFactory;
        $this->_voteFactory = $voteFactory;
        $this->_ratingFactory = $ratingFactory;
        $this->currentCustomer = $currentCustomer;
        parent::__construct(
            $context,
            $data
        );
    }

    protected function _construct()
    {
        parent::_construct();
        $this->setReviewId($this->getRequest()->getParam('id', false));
    }

    public function getProductData()
    {
        if ($this->getReviewId() && !$this->getProductCacheData()) {
            $product = $this->productRepository->getById($this->getReviewData()->getEntityPkValue());
            $this->setProductCacheData($product);
        }
        return $this->getProductCacheData();
    }

    public function getReviewData()
    {
        if ($this->getReviewId() && !$this->getReviewCachedData()) {
            $this->setReviewCachedData($this->_reviewFactory->create()->load($this->getReviewId()));
        }
        return $this->getReviewCachedData();
    }

    public function getBackUrl()
    {
        return $this->getUrl('review/customer');
    }

    public function getRating()
    {
        if (!$this->getRatingCollection()) {
            $ratingCollection = $this->_voteFactory->create()->getResourceCollection()->setReviewFilter(
                $this->getReviewId()
            )->addRatingInfo(
                $this->_storeManager->getStore()->getId()
            )->setStoreFilter(
                $this->_storeManager->getStore()->getId()
            )->load();

            $this->setRatingCollection($ratingCollection->getSize() ? $ratingCollection : false);
        }

        return $this->getRatingCollection();
    }

    public function getRatingSummary()
    {
        if (!$this->getRatingSummaryCache()) {
            $this->setRatingSummaryCache(
                $this->_ratingFactory->create()->getEntitySummary($this->getProductData()->getId())
            );
        }
        return $this->getRatingSummaryCache();
    }

    public function getTotalReviews()
    {
        if (!$this->getTotalReviewsCache()) {
            $this->setTotalReviewsCache(
                $this->_reviewFactory->create()->getTotalReviews($this->getProductData()->getId()),
                false,
                $this->_storeManager->getStore()->getId()
            );
        }
        return $this->getTotalReviewsCache();
    }

    public function dateFormat($date)
    {
        return $this->formatDate($date, \IntlDateFormatter::LONG);
    }

    public function getReviewsSummaryHtml(
        \Magento\Catalog\Model\Product $product,
        $templateType = false,
        $displayIfNoReviews = false
    ) {
        if (!$product->getRatingSummary()) {
            $this->_reviewFactory->create()->getEntitySummary($product, $this->_storeManager->getStore()->getId());
        }
        return parent::getReviewsSummaryHtml($product, $templateType, $displayIfNoReviews);
    }

    protected function _toHtml()
    {
        return $this->currentCustomer->getCustomerId() ? parent::_toHtml() : '';
    }
}