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[yaffs-website] / web / core / modules / taxonomy / src / Plugin / migrate / process / ForumVocabulary.php

diff --git a/web/core/modules/taxonomy/src/Plugin/migrate/process/ForumVocabulary.php b/web/core/modules/taxonomy/src/Plugin/migrate/process/ForumVocabulary.php
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+++ b/web/core/modules/taxonomy/src/Plugin/migrate/process/ForumVocabulary.php
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+<?php
+
+namespace Drupal\taxonomy\Plugin\migrate\process;
+
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * Checks if the vocabulary being migrated is the one used for forums.
+ *
+ * Drupal 8 Forum is expecting specific machine names for its field and
+ * vocabulary names. This process plugin forces a given machine name to the
+ * field or vocabulary that is being migrated.
+ *
+ * The 'forum_vocabulary' source property is evaluated in the
+ * d6_taxonomy_vocabulary or d7_taxonomy_vocabulary source plugins and is set to
+ * true if the vocabulary vid being migrated is the same as the one in the
+ * 'forum_nav_vocabulary' variable on the source site.
+ *
+ * Example:
+ *
+ * @code
+ * process:
+ *   field_name:
+ *     plugin: forum_vocabulary
+ *     machine_name: taxonomy_forums
+ * @endcode
+ *
+ * @MigrateProcessPlugin(
+ *   id = "forum_vocabulary"
+ * )
+ */
+class ForumVocabulary extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    if ($row->getSourceProperty('forum_vocabulary') && !empty($this->configuration['machine_name'])) {
+      $value = $this->configuration['machine_name'];
+    }
+    return $value;
+  }
+
+}