protected function setUp()
 {
     $this->productBuilder = $this->getMock('Magento\\Catalog\\Controller\\Adminhtml\\Product\\Builder', ['build'], [], '', false);
     $this->product = $this->getMockBuilder('Magento\\Catalog\\Model\\Product')->disableOriginalConstructor()->setMethods(['addData', 'getSku', 'getTypeId', 'getStoreId', '__sleep', '__wakeup', 'getAttributes', 'setAttributeSetId'])->getMock();
     $this->product->expects($this->any())->method('getTypeId')->will($this->returnValue('simple'));
     $this->product->expects($this->any())->method('getStoreId')->will($this->returnValue('1'));
     $this->product->expects($this->any())->method('getAttributes')->will($this->returnValue([]));
     $this->productBuilder->expects($this->any())->method('build')->will($this->returnValue($this->product));
     $this->resultPage = $this->getMockBuilder('Magento\\Backend\\Model\\View\\Result\\Page')->disableOriginalConstructor()->getMock();
     $resultPageFactory = $this->getMockBuilder('Magento\\Framework\\View\\Result\\PageFactory')->disableOriginalConstructor()->setMethods(['create'])->getMock();
     $resultPageFactory->expects($this->any())->method('create')->willReturn($this->resultPage);
     $this->resultForward = $this->getMockBuilder('Magento\\Backend\\Model\\View\\Result\\Forward')->disableOriginalConstructor()->getMock();
     $resultForwardFactory = $this->getMockBuilder('Magento\\Backend\\Model\\View\\Result\\ForwardFactory')->disableOriginalConstructor()->setMethods(['create'])->getMock();
     $resultForwardFactory->expects($this->any())->method('create')->willReturn($this->resultForward);
     $this->resultPage->expects($this->any())->method('getLayout')->willReturn($this->layout);
     $this->resultRedirectFactory = $this->getMock('Magento\\Backend\\Model\\View\\Result\\RedirectFactory', ['create'], [], '', false);
     $this->resultRedirect = $this->getMock('Magento\\Backend\\Model\\View\\Result\\Redirect', [], [], '', false);
     $this->resultRedirectFactory->expects($this->any())->method('create')->willReturn($this->resultRedirect);
     $this->initializationHelper = $this->getMock('Magento\\Catalog\\Controller\\Adminhtml\\Product\\Initialization\\Helper', [], [], '', false);
     $this->productFactory = $this->getMockBuilder('Magento\\Catalog\\Model\\ProductFactory')->disableOriginalConstructor()->setMethods(['create'])->getMock();
     $this->productFactory->expects($this->any())->method('create')->willReturn($this->product);
     $this->resultJson = $this->getMock('Magento\\Framework\\Controller\\Result\\Json', [], [], '', false);
     $this->resultJsonFactory = $this->getMockBuilder('Magento\\Framework\\Controller\\Result\\JsonFactory')->disableOriginalConstructor()->setMethods(['create'])->getMock();
     $this->resultJsonFactory->expects($this->any())->method('create')->willReturn($this->resultJson);
     $additionalParams = ['resultRedirectFactory' => $this->resultRedirectFactory];
     $this->action = (new ObjectManagerHelper($this))->getObject('Magento\\Catalog\\Controller\\Adminhtml\\Product\\Validate', ['context' => $this->initContext($additionalParams), 'productBuilder' => $this->productBuilder, 'resultPageFactory' => $resultPageFactory, 'resultForwardFactory' => $resultForwardFactory, 'initializationHelper' => $this->initializationHelper, 'resultJsonFactory' => $this->resultJsonFactory, 'productFactory' => $this->productFactory]);
 }

 protected function setUp()
 {
     $this->product = $this->getMock('Magento\\Catalog\\Model\\Product', [], [], '', false);
     $this->productFactory = $this->getMock('Magento\\Catalog\\Model\\ProductFactory', ['create'], [], '', false);
     $this->productFactory->expects($this->any())->method('create')->will($this->returnValue($this->product));
     $this->visibility = $this->getMock('Magento\\Catalog\\Model\\Product\\Visibility', [], [], '', false);
     $this->timezone = $this->getMock('Magento\\Framework\\Stdlib\\DateTime\\Timezone', [], [], '', false);
     $this->objectManagerHelper = new ObjectManagerHelper($this);
     $this->newProducts = $this->objectManagerHelper->getObject('Magento\\Catalog\\Model\\Rss\\Product\\NewProducts', ['productFactory' => $this->productFactory, 'visibility' => $this->visibility, 'localeDate' => $this->timezone]);
 }

 protected function setUp()
 {
     $this->objectManagerHelper = new ObjectManagerHelper($this);
     $this->mathDivision = $this->getMock('\\Magento\\Framework\\Math\\Division', ['getExactDivision'], [], '', false);
     $this->localeFormat = $this->getMockForAbstractClass('\\Magento\\Framework\\Locale\\FormatInterface', ['getNumber']);
     $this->localeFormat->expects($this->any())->method('getNumber')->willReturn($this->qty);
     $this->object = $this->objectManagerHelper->getObject('Magento\\Framework\\DataObject');
     $this->objectFactory = $this->getMock('\\Magento\\Framework\\DataObject\\Factory', ['create'], [], '', false);
     $this->objectFactory->expects($this->any())->method('create')->willReturn($this->object);
     $this->product = $this->getMock('Magento\\Catalog\\Model\\Product', ['load', 'isComposite', '__wakeup', 'isSaleable'], [], '', false);
     $this->productFactory = $this->getMock('Magento\\Catalog\\Model\\ProductFactory', ['create'], [], '', false);
     $this->productFactory->expects($this->any())->method('create')->willReturn($this->product);
     $this->stockStateProvider = $this->objectManagerHelper->getObject('Magento\\CatalogInventory\\Model\\StockStateProvider', ['mathDivision' => $this->mathDivision, 'localeFormat' => $this->localeFormat, 'objectFactory' => $this->objectFactory, 'productFactory' => $this->productFactory, 'qtyCheckApplicable' => $this->qtyCheckApplicable]);
 }

 /**
  * Get or create new instance of product
  *
  * @return \Magento\Catalog\Model\Product
  */
 private function _getProduct()
 {
     if (!$this->hasData('product')) {
         $this->setProduct($this->_productFactory->create());
     }
     return $this->getProduct();
 }

 /**
  * Product variations attributes validation
  *
  * @param Product $parentProduct
  * @param array $products
  * @param RequestInterface $request
  * @return array
  */
 protected function _validateProductVariations(Product $parentProduct, array $products, RequestInterface $request)
 {
     $this->eventManager->dispatch('catalog_product_validate_variations_before', ['product' => $parentProduct, 'variations' => $products]);
     $validationResult = [];
     foreach ($products as $productData) {
         $product = $this->productFactory->create();
         $product->setData('_edit_mode', true);
         $storeId = $request->getParam('store');
         if ($storeId) {
             $product->setStoreId($storeId);
         }
         $product->setAttributeSetId($parentProduct->getAttributeSetId());
         $product->addData($this->getRequiredDataFromProduct($parentProduct));
         $product->addData($productData);
         $product->setCollectExceptionMessages(true);
         $configurableAttribute = [];
         $encodedData = $productData['configurable_attribute'];
         if ($encodedData) {
             $configurableAttribute = $this->jsonHelper->jsonDecode($encodedData);
         }
         $configurableAttribute = implode('-', $configurableAttribute);
         $errorAttributes = $product->validate();
         if (is_array($errorAttributes)) {
             foreach ($errorAttributes as $attributeCode => $result) {
                 if (is_string($result)) {
                     $key = 'variations-matrix-' . $configurableAttribute . '-' . $attributeCode;
                     $validationResult[$key] = $result;
                 }
             }
         }
     }
     return $validationResult;
 }

 /**
  * @return string
  */
 protected function _toHtml()
 {
     $storeId = $this->_getStoreId();
     $storeModel = $this->_storeManager->getStore($storeId);
     $newUrl = $this->_urlBuilder->getUrl('rss/catalog/new/store_id/' . $storeId);
     $title = __('New Products from %1', $storeModel->getFrontendName());
     $lang = $this->_scopeConfig->getValue('general/locale/code', \Magento\Store\Model\ScopeInterface::SCOPE_STORE, $storeModel);
     /** @var $rssObj \Magento\Rss\Model\Rss */
     $rssObj = $this->_rssFactory->create();
     $rssObj->_addHeader(array('title' => $title, 'description' => $title, 'link' => $newUrl, 'charset' => 'UTF-8', 'language' => $lang));
     /** @var $product \Magento\Catalog\Model\Product */
     $product = $this->_productFactory->create();
     $todayStartOfDayDate = $this->_localeDate->date()->setTime('00:00:00')->toString(\Magento\Framework\Stdlib\DateTime::DATETIME_INTERNAL_FORMAT);
     $todayEndOfDayDate = $this->_localeDate->date()->setTime('23:59:59')->toString(\Magento\Framework\Stdlib\DateTime::DATETIME_INTERNAL_FORMAT);
     /** @var $products \Magento\Catalog\Model\Resource\Product\Collection */
     $products = $product->getCollection();
     $products->setStoreId($storeId);
     $products->addStoreFilter()->addAttributeToFilter('news_from_date', array('or' => array(0 => array('date' => true, 'to' => $todayEndOfDayDate), 1 => array('is' => new \Zend_Db_Expr('null')))), 'left')->addAttributeToFilter('news_to_date', array('or' => array(0 => array('date' => true, 'from' => $todayStartOfDayDate), 1 => array('is' => new \Zend_Db_Expr('null')))), 'left')->addAttributeToFilter(array(array('attribute' => 'news_from_date', 'is' => new \Zend_Db_Expr('not null')), array('attribute' => 'news_to_date', 'is' => new \Zend_Db_Expr('not null'))))->addAttributeToSort('news_from_date', 'desc')->addAttributeToSelect(array('name', 'short_description', 'description'), 'inner')->addAttributeToSelect(array('price', 'special_price', 'special_from_date', 'special_to_date', 'msrp_enabled', 'msrp_display_actual_price_type', 'msrp', 'thumbnail'), 'left')->applyFrontendPriceLimitations();
     $products->setVisibility($this->_visibility->getVisibleInCatalogIds());
     /*
     using resource iterator to load the data one by one
     instead of loading all at the same time. loading all data at the same time can cause the big memory allocation.
     */
     $this->_resourceIterator->walk($products->getSelect(), array(array($this, 'addNewItemXmlCallback')), array('rssObj' => $rssObj, 'product' => $product));
     return $rssObj->createRssXml();
 }

 /**
  * Populate product with variation of attributes
  *
  * @param \Magento\Catalog\Api\Data\ProductInterface $product
  * @param array $attributes
  * @return \Magento\Catalog\Api\Data\ProductInterface[]
  */
 public function create(\Magento\Catalog\Api\Data\ProductInterface $product, $attributes)
 {
     $variations = $this->variationMatrix->getVariations($attributes);
     $products = [];
     foreach ($variations as $variation) {
         $price = $product->getPrice();
         /** @var \Magento\Catalog\Model\Product $item */
         $item = $this->productFactory->create();
         $item->setData($product->getData());
         $suffix = '';
         foreach ($variation as $attributeId => $valueInfo) {
             $suffix .= '-' . $valueInfo['value'];
             $customAttribute = $this->customAttributeFactory->create()->setAttributeCode($attributes[$attributeId]['attribute_code'])->setValue($valueInfo['value']);
             $customAttributes = array_merge($item->getCustomAttributes(), [$attributes[$attributeId]['attribute_code'] => $customAttribute]);
             $item->setData('custom_attributes', $customAttributes);
             $priceInfo = $valueInfo['price'];
             $price += (!empty($priceInfo['is_percent']) ? $product->getPrice() / 100.0 : 1.0) * $priceInfo['pricing_value'];
         }
         $item->setPrice($price);
         $item->setName($product->getName() . $suffix);
         $item->setSku($product->getSku() . $suffix);
         $item->setVisibility(\Magento\Catalog\Model\Product\Visibility::VISIBILITY_NOT_VISIBLE);
         $products[] = $item;
     }
     return $products;
 }

 /**
  * Create product duplicate
  *
  * @param \Magento\Catalog\Model\Product $product
  * @return \Magento\Catalog\Model\Product
  */
 public function copy(\Magento\Catalog\Model\Product $product)
 {
     $product->getWebsiteIds();
     $product->getCategoryIds();
     $duplicate = $this->productFactory->create();
     $duplicate->setData($product->getData());
     $duplicate->setIsDuplicate(true);
     $duplicate->setOriginalId($product->getId());
     $duplicate->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_DISABLED);
     $duplicate->setCreatedAt(null);
     $duplicate->setUpdatedAt(null);
     $duplicate->setId(null);
     $duplicate->setStoreId(\Magento\Store\Model\Store::DEFAULT_STORE_ID);
     $this->copyConstructor->build($product, $duplicate);
     $isDuplicateSaved = false;
     do {
         $urlKey = $duplicate->getUrlKey();
         $urlKey = preg_match('/(.*)-(\\d+)$/', $urlKey, $matches) ? $matches[1] . '-' . ($matches[2] + 1) : $urlKey . '-1';
         $duplicate->setUrlKey($urlKey);
         try {
             $duplicate->save();
             $isDuplicateSaved = true;
         } catch (DuplicateEntryException $e) {
         }
     } while (!$isDuplicateSaved);
     $product->getOptionInstance()->duplicate($product->getId(), $duplicate->getId());
     $product->getResource()->duplicate($product->getId(), $duplicate->getId());
     return $duplicate;
 }

 /**
  * Products collection.
  *
  * @return array
  */
 public function getLoadedProductCollection()
 {
     $productsToDisplay = [];
     $mode = $this->getRequest()->getActionName();
     $customerId = $this->getRequest()->getParam('customer_id');
     $limit = $this->recommnededHelper->getDisplayLimitByMode($mode);
     //login customer to receive the recent products
     $session = $this->sessionFactory->create();
     $isLoggedIn = $session->loginById($customerId);
     $collection = $this->viewed;
     $productItems = $collection->getItemsCollection()->setPageSize($limit);
     //get the product ids from items collection
     $productIds = $productItems->getColumnValues('product_id');
     //get product collection to check for salable
     $productCollection = $this->productFactory->create()->getCollection()->addAttributeToSelect('*')->addFieldToFilter('entity_id', ['in' => $productIds]);
     //show products only if is salable
     foreach ($productCollection as $product) {
         if ($product->isSalable()) {
             $productsToDisplay[$product->getId()] = $product;
         }
     }
     $this->helper->log('Recentlyviewed customer  : ' . $customerId . ', mode ' . $mode . ', limit : ' . $limit . ', items found : ' . count($productItems) . ', is customer logged in : ' . $isLoggedIn . ', products :' . count($productsToDisplay));
     $session->logout();
     return $productsToDisplay;
 }

 /**
  * Get associated grouped products grid popup
  *
  * @return void
  */
 public function execute()
 {
     $productId = (int) $this->getRequest()->getParam('id');
     /** @var $product \Magento\Catalog\Model\Product */
     $product = $this->factory->create();
     $product->setStoreId($this->getRequest()->getParam('store', 0));
     $typeId = $this->getRequest()->getParam('type');
     if (!$productId && $typeId) {
         $product->setTypeId($typeId);
     }
     $product->setData('_edit_mode', true);
     if ($productId) {
         try {
             $product->load($productId);
         } catch (\Exception $e) {
             $product->setTypeId(\Magento\Catalog\Model\Product\Type::DEFAULT_TYPE);
             $this->logger->logException($e);
         }
     }
     $setId = (int) $this->getRequest()->getParam('set');
     if ($setId) {
         $product->setAttributeSetId($setId);
     }
     $this->registry->register('current_product', $product);
     $this->_view->loadLayout(false);
     $this->_view->renderLayout();
 }

 /**
  * Get categories tree as recursive array
  *
  * @param int $parentId
  * @param bool $asJson
  * @param int $recursionLevel
  * @return array
  */
 public function getTreeArray($parentId = null, $asJson = false, $recursionLevel = 3)
 {
     $productId = $this->_request->getParam('product');
     if ($productId) {
         $product = $this->_productFactory->create()->setId($productId);
         $this->_allowedCategoryIds = $product->getCategoryIds();
         unset($product);
     }
     $result = [];
     if ($parentId) {
         try {
             $category = $this->categoryRepository->get($parentId);
         } catch (NoSuchEntityException $e) {
             $category = null;
         }
         if ($category) {
             $tree = $this->_getNodesArray($this->getNode($category, $recursionLevel));
             if (!empty($tree) && !empty($tree['children'])) {
                 $result = $tree['children'];
             }
         }
     } else {
         $result = $this->_getNodesArray($this->getRoot(null, $recursionLevel));
     }
     if ($asJson) {
         return $this->_jsonEncoder->encode($result);
     }
     $this->_allowedCategoryIds = [];
     return $result;
 }

 /**
  * Create product duplicate
  *
  * @param \Magento\Catalog\Model\Product $product
  * @return \Magento\Catalog\Model\Product
  */
 public function copy(\Magento\Catalog\Model\Product $product)
 {
     $product->getWebsiteIds();
     $product->getCategoryIds();
     /** @var \Magento\Catalog\Model\Product $duplicate */
     $duplicate = $this->productFactory->create();
     $duplicate->setData($product->getData());
     $duplicate->setOptions([]);
     $duplicate->setIsDuplicate(true);
     $duplicate->setOriginalId($product->getEntityId());
     $duplicate->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_DISABLED);
     $duplicate->setCreatedAt(null);
     $duplicate->setUpdatedAt(null);
     $duplicate->setId(null);
     $duplicate->setStoreId(\Magento\Store\Model\Store::DEFAULT_STORE_ID);
     $this->copyConstructor->build($product, $duplicate);
     $isDuplicateSaved = false;
     do {
         $urlKey = $duplicate->getUrlKey();
         $urlKey = preg_match('/(.*)-(\\d+)$/', $urlKey, $matches) ? $matches[1] . '-' . ($matches[2] + 1) : $urlKey . '-1';
         $duplicate->setUrlKey($urlKey);
         try {
             $duplicate->save();
             $isDuplicateSaved = true;
         } catch (\Magento\Framework\Exception\AlreadyExistsException $e) {
         }
     } while (!$isDuplicateSaved);
     $this->getOptionRepository()->duplicate($product, $duplicate);
     $metadata = $this->getMetadataPool()->getMetadata(ProductInterface::class);
     $product->getResource()->duplicate($product->getData($metadata->getLinkField()), $duplicate->getData($metadata->getLinkField()));
     return $duplicate;
 }

 /**
  * Get associated grouped products grid popup
  *
  * @return \Magento\Framework\View\Result\Layout
  */
 public function execute()
 {
     $productId = (int) $this->getRequest()->getParam('id');
     /** @var $product \Magento\Catalog\Model\Product */
     $product = $this->factory->create();
     $product->setStoreId($this->getRequest()->getParam('store', 0));
     $typeId = $this->getRequest()->getParam('type');
     if (!$productId && $typeId) {
         $product->setTypeId($typeId);
     }
     $product->setData('_edit_mode', true);
     if ($productId) {
         try {
             $product->load($productId);
         } catch (\Exception $e) {
             $product->setTypeId(\Magento\Catalog\Model\Product\Type::DEFAULT_TYPE);
             $this->logger->critical($e);
         }
     }
     $setId = (int) $this->getRequest()->getParam('set');
     if ($setId) {
         $product->setAttributeSetId($setId);
     }
     $this->registry->register('current_product', $product);
     /** @var \Magento\Framework\View\Result\Layout $resultLayout */
     $resultLayout = $this->resultFactory->create(ResultFactory::TYPE_LAYOUT);
     return $resultLayout;
 }

 /**
  * Build product based on user request
  *
  * @param RequestInterface $request
  * @return \Magento\Catalog\Model\Product
  */
 public function build(RequestInterface $request)
 {
     $productId = (int) $request->getParam('id');
     /** @var $product \Magento\Catalog\Model\Product */
     $product = $this->productFactory->create();
     $product->setStoreId($request->getParam('store', 0));
     $typeId = $request->getParam('type');
     if (!$productId && $typeId) {
         $product->setTypeId($typeId);
     }
     $product->setData('_edit_mode', true);
     if ($productId) {
         try {
             $product->load($productId);
         } catch (\Exception $e) {
             $product->setTypeId(\Magento\Catalog\Model\Product\Type::DEFAULT_TYPE);
             $this->logger->critical($e);
         }
     }
     $setId = (int) $request->getParam('set');
     if ($setId) {
         $product->setAttributeSetId($setId);
     }
     $this->registry->register('product', $product);
     $this->registry->register('current_product', $product);
     $this->wysiwygConfig->setStoreId($request->getParam('store'));
     return $product;
 }

 /**
  * {@inheritdoc}
  */
 public function run()
 {
     $this->logger->log('Installing product links:');
     $entityFileAssociation = ['related', 'upsell', 'crosssell'];
     foreach ($this->postInstaller->getInstalledModuleList() as $moduleName) {
         foreach ($entityFileAssociation as $linkType) {
             $fileName = substr($moduleName, strpos($moduleName, "_") + 1) . '/Links/' . $linkType . '.csv';
             $fileName = $this->fixtureHelper->getPath($fileName);
             if (!$fileName) {
                 continue;
             }
             /** @var \Magento\SampleData\Helper\Csv\ReaderFactory $csvReader */
             $csvReader = $this->csvReaderFactory->create(['fileName' => $fileName, 'mode' => 'r']);
             foreach ($csvReader as $row) {
                 /** @var \Magento\Catalog\Model\Product $product */
                 $product = $this->productFactory->create();
                 $productId = $product->getIdBySku($row['sku']);
                 if (!$productId) {
                     continue;
                 }
                 $product->setId($productId);
                 $links = [$linkType => []];
                 foreach (explode("\n", $row['linked_sku']) as $linkedProductSku) {
                     $linkedProductId = $product->getIdBySku($linkedProductSku);
                     if ($linkedProductId) {
                         $links[$linkType][$linkedProductId] = [];
                     }
                 }
                 $this->linksInitializer->initializeLinks($product, $links);
                 $product->getLinkInstance()->saveProductRelations($product);
                 $this->logger->logInline('.');
             }
         }
     }
 }

 /**
  * @return array
  */
 public function getMediaAttributes()
 {
     static $simple;
     if (empty($simple)) {
         $simple = $this->productFactory->create()->setTypeId(Type::TYPE_SIMPLE)->getMediaAttributes();
     }
     return $simple;
 }

 /**
  * @param int $storeId
  * @param int $customerGroupId
  * @return \Magento\Catalog\Model\ResourceModel\Product\Collection
  */
 public function getProductsCollection($storeId, $customerGroupId)
 {
     $websiteId = $this->storeManager->getStore($storeId)->getWebsiteId();
     /** @var $product \Magento\Catalog\Model\Product */
     $product = $this->productFactory->create();
     $product->setStoreId($storeId);
     $collection = $product->getResourceCollection()->addPriceDataFieldFilter('%s < %s', ['final_price', 'price'])->addPriceData($customerGroupId, $websiteId)->addAttributeToSelect(['name', 'short_description', 'description', 'price', 'thumbnail', 'special_price', 'special_to_date', 'msrp_display_actual_price_type', 'msrp'], 'left')->addAttributeToSort('name', 'asc');
     return $collection;
 }

 /**
  * Get product id
  *
  * @param \Magento\Sales\Model\Order\Admin\Item $subject
  * @param callable $proceed
  * @param \Magento\Sales\Model\Order\Item $item
  *
  * @return int
  * @SuppressWarnings(PHPMD.UnusedFormalParameter)
  */
 public function aroundGetProductId(\Magento\Sales\Model\Order\Admin\Item $subject, \Closure $proceed, \Magento\Sales\Model\Order\Item $item)
 {
     if ($item->getProductType() == \Magento\ConfigurableProduct\Model\Product\Type\Configurable::TYPE_CODE) {
         $productOptions = $item->getProductOptions();
         $product = $this->productFactory->create();
         return $product->getIdBySku($productOptions['simple_sku']);
     }
     return $proceed($item);
 }

 /**
  * Get the products to display for table.
  *
  * @return $this
  */
 public function getLoadedProductCollection()
 {
     $mode = $this->getRequest()->getActionName();
     $limit = $this->recommnededHelper->getDisplayLimitByMode($mode);
     $productIds = $this->recommnededHelper->getProductPushIds();
     $productCollection = $this->productFactory->create()->getCollection()->addAttributeToSelect('*')->addAttributeToFilter('entity_id', ['in' => $productIds]);
     $productCollection->getSelect()->limit($limit);
     //important check the salable product in template
     return $productCollection;
 }

 /**
  * Apply sorting and filtering to collection
  *
  * @return $this
  */
 protected function _prepareCollection()
 {
     $collection = $this->_productFactory->create()->getCollection()->setOrder('id')->addAttributeToSelect('name')->addAttributeToSelect('sku')->addAttributeToSelect('price')->addAttributeToSelect('attribute_set_id')->addAttributeToFilter('entity_id', ['nin' => $this->_getSelectedProducts()])->addAttributeToFilter('type_id', ['in' => $this->getAllowedSelectionTypes()])->addFilterByRequiredOptions()->addStoreFilter(\Magento\Store\Model\Store::DEFAULT_STORE_ID);
     if ($this->getFirstShow()) {
         $collection->addIdFilter('-1');
         $this->setEmptyText(__('Please enter search conditions to view products.'));
     }
     $this->setCollection($collection);
     return parent::_prepareCollection();
 }