PdfDocumentsMassAction.php

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<?php
namespace Magento\Sales\Controller\Adminhtml\Order;

use Magento\Framework\Controller\ResultFactory;

abstract class PdfDocumentsMassAction extends \Magento\Sales\Controller\Adminhtml\Order\AbstractMassAction
{
    protected $orderCollectionFactory;

    public function execute()
    {
        try {
            $collection = $this->filter->getCollection($this->getOrderCollection()->create());
            return $this->massAction($collection);
        } catch (\Exception $e) {
            $this->messageManager->addErrorMessage($e->getMessage());
            $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
            return $resultRedirect->setPath($this->redirectUrl);
        }
    }

    private function getOrderCollection()
    {
        if ($this->orderCollectionFactory === null) {
            $this->orderCollectionFactory = \Magento\Framework\App\ObjectManager::getInstance()->get(
                \Magento\Sales\Model\ResourceModel\Order\CollectionFactory::class
            );
        }
        return $this->orderCollectionFactory;
    }
}