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[yaffs-website] / web / core / lib / Drupal / Core / TypedData / Plugin / DataType / LanguageReference.php

diff --git a/web/core/lib/Drupal/Core/TypedData/Plugin/DataType/LanguageReference.php b/web/core/lib/Drupal/Core/TypedData/Plugin/DataType/LanguageReference.php
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+++ b/web/core/lib/Drupal/Core/TypedData/Plugin/DataType/LanguageReference.php
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+<?php
+
+namespace Drupal\Core\TypedData\Plugin\DataType;
+
+use Drupal\Core\TypedData\DataReferenceBase;
+
+/**
+ * Defines the 'language_reference' data type.
+ *
+ * This serves as 'language' property of language field items and gets
+ * its value set from the parent, i.e. LanguageItem.
+ *
+ * The plain value is the language object, i.e. an instance of
+ * \Drupal\Core\Language\Language. For setting the value the language object or
+ * the language code as string may be passed.
+ *
+ * @DataType(
+ *   id = "language_reference",
+ *   label = @Translation("Language reference"),
+ *   definition_class = "\Drupal\Core\TypedData\DataReferenceDefinition"
+ * )
+ */
+class LanguageReference extends DataReferenceBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTargetIdentifier() {
+    $language = $this->getTarget();
+    return isset($language) ? $language->id() : NULL;
+  }
+
+}