Import: Allow injecting own link types to LinkProcessor

Author: amenk

app/code/Magento/CatalogImportExport/Model/Import/Product.php

@@ -222,6 +222,8 @@ class Product extends \Magento\ImportExport\Model\Import\Entity\AbstractEntity
     /**
      * Links attribute name-to-link type ID.
      *
+     * @deprecated use DI for LinkProcessor class if you want to add additional types
+     *
      * @var array
      */
     protected $_linkNameToId = [
@@ -882,6 +884,8 @@ public function __construct(
             ->get(StockItemImporterInterface::class);
         $this->linkProcessor = $linkProcessor ?? ObjectManager::getInstance()
                 ->get(LinkProcessor::class);
+        $this->linkProcessor->addNameToIds($this->_linkNameToId);
+
         parent::__construct(
             $jsonHelper,
             $importExportData,

app/code/Magento/CatalogImportExport/Model/Import/Product/LinkProcessor.php

@@ -30,6 +30,10 @@ class LinkProcessor
         '_crosssell_' => \Magento\Catalog\Model\Product\Link::LINK_TYPE_CROSSSELL,
         '_upsell_' => \Magento\Catalog\Model\Product\Link::LINK_TYPE_UPSELL,
     ];
+    /**
+     * @var array
+     */
+    private $linkNameToId;
 
     /** @var LinkFactory */
     private $linkFactory;
@@ -38,21 +42,24 @@ class LinkProcessor
     private $resourceHelper;
 
     /** @var SkuProcessor */
-    protected $skuProcessor;
+    private $skuProcessor;
 
     /** @var LoggerInterface */
-    protected $logger;
+    private $logger;
 
     public function __construct(
         LinkFactory $linkFactory,
         Helper $resourceHelper,
         SkuProcessor $skuProcessor,
-        LoggerInterface $logger
+        LoggerInterface $logger,
+        array $linkNameToId
     ) {
         $this->linkFactory = $linkFactory;
         $this->resourceHelper = $resourceHelper;
         $this->skuProcessor = $skuProcessor;
         $this->logger = $logger;
+
+        $this->linkNameToId = $linkNameToId;
     }
 
     /**
@@ -92,6 +99,11 @@ public function saveLinks(
         return $this;
     }
 
+    public function addNameToIds($nameToIds)
+    {
+        $this->linkNameToId = array_merge($nameToIds, $this->linkNameToId);
+    }
+
     /**
      * Processes link bunches
      *

app/code/Magento/CatalogImportExport/etc/di.xml

@@ -28,4 +28,13 @@
             </argument>
         </arguments>
     </type>
+    <type name="Magento\CatalogImportExport\Model\Import\Product\LinkProcessor">
+        <arguments>
+            <argument name="linkNameToId" xsi:type="array">
+                <item name="_related_" xsi:type="const">Magento\Catalog\Model\Product\Link::LINK_TYPE_RELATED</item>
+                <item name="_crosssell_" xsi:type="const">Magento\Catalog\Model\Product\Link::LINK_TYPE_CROSSSELL</item>
+                <item name="_upsell_" xsi:type="const">Magento\Catalog\Model\Product\Link::LINK_TYPE_UPSELL</item>
+            </argument>
+        </arguments>
+    </type>
 </config>