Clear.php

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

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Framework\Controller\ResultFactory;

class Clear extends \Magento\Catalog\Controller\Product\Compare implements HttpPostActionInterface
{
    public function execute()
    {
        $items = $this->_itemCollectionFactory->create();

        if ($this->_customerSession->isLoggedIn()) {
            $items->setCustomerId($this->_customerSession->getCustomerId());
        } elseif ($this->_customerId) {
            $items->setCustomerId($this->_customerId);
        } else {
            $items->setVisitorId($this->_customerVisitor->getId());
        }

        try {
            $items->clear();
            $this->messageManager->addSuccessMessage(__('You cleared the comparison list.'));
            $this->_objectManager->get(\Magento\Catalog\Helper\Product\Compare::class)->calculate();
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->messageManager->addErrorMessage($e->getMessage());
        } catch (\Exception $e) {
            $this->messageManager->addExceptionMessage($e, __('Something went wrong  clearing the comparison list.'));
        }

        $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
        return $resultRedirect->setRefererOrBaseUrl();
    }
}