Compare.php

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<?php
namespace Magento\Catalog\Controller\Product;

use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Framework\Data\Form\FormKey\Validator;
use Magento\Framework\View\Result\PageFactory;

abstract class Compare extends \Magento\Framework\App\Action\Action
{
    protected $_customerId = null;

    protected $_catalogSession;

    protected $_catalogProductCompareList;

    protected $_customerVisitor;

    protected $_customerSession;

    protected $_itemCollectionFactory;

    protected $_compareItemFactory;

    protected $_storeManager;

    protected $_formKeyValidator;

    protected $resultPageFactory;

    protected $productRepository;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Catalog\Model\Product\Compare\ItemFactory $compareItemFactory,
        \Magento\Catalog\Model\ResourceModel\Product\Compare\Item\CollectionFactory $itemCollectionFactory,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Customer\Model\Visitor $customerVisitor,
        \Magento\Catalog\Model\Product\Compare\ListCompare $catalogProductCompareList,
        \Magento\Catalog\Model\Session $catalogSession,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        Validator $formKeyValidator,
        PageFactory $resultPageFactory,
        ProductRepositoryInterface $productRepository
    ) {
        $this->_storeManager = $storeManager;
        $this->_compareItemFactory = $compareItemFactory;
        $this->_itemCollectionFactory = $itemCollectionFactory;
        $this->_customerSession = $customerSession;
        $this->_customerVisitor = $customerVisitor;
        $this->_catalogProductCompareList = $catalogProductCompareList;
        $this->_catalogSession = $catalogSession;
        $this->_formKeyValidator = $formKeyValidator;
        $this->resultPageFactory = $resultPageFactory;
        $this->productRepository = $productRepository;
        parent::__construct($context);
    }

    public function setCustomerId($customerId)
    {
        $this->_customerId = $customerId;
        return $this;
    }
}