Only adding rdf:type to the first entry in the jsonld graph (#131)

* Only adding rdf:type to the first entry in the jsonld graph

* Whitespace

* Searching for entity in graph instead of assuming it's the first

src/Plugin/ContextReaction/JsonldTypeAlterReaction.php

@@ -28,12 +28,22 @@ class JsonldTypeAlterReaction extends NormalizerAlterReaction {
    * {@inheritdoc}
    */
   public function execute(EntityInterface $entity = NULL, array &$normalized = NULL, array $context = NULL) {
+    // Check that the source field exists and there's some RDF
+    // to manipulate.
     $config = $this->getConfiguration();
-    // Use a pre-configured field as the source of the additional @type.
+    $ok = $entity->hasField($config['source_field']) &&
-    if (($entity->hasField($config['source_field'])) &&
+        !empty($entity->get($config['source_field'])->getValue()) &&
-        (!empty($entity->get($config['source_field'])->getValue()))) {
+        isset($normalized['@graph']) &&
-      if (isset($normalized['@graph']) && is_array($normalized['@graph'])) {
+        is_array($normalized['@graph']) &&
-        foreach ($normalized['@graph'] as &$graph) {
+        !empty($normalized['@graph']);
+
+    if (!$ok) {
+      return;
+    }
+
+    // Search for the entity in the graph.
+    foreach ($normalized['@graph'] as &$elem) {
+      if ($elem['@id'] === $entity->toUrl()->setAbsolute()->toString() . '?_format=jsonld') {
         foreach ($entity->get($config['source_field'])->getValue() as $type) {
           // If the configured field is using an entity reference,
           // we will see if it uses the core config's field_external_uri.
@@ -43,15 +53,15 @@ class JsonldTypeAlterReaction extends NormalizerAlterReaction {
             if ($referenced_entity->hasField('field_external_uri') &&
                 !empty($referenced_entity->get('field_external_uri')->getValue())) {
               foreach ($referenced_entity->get('field_external_uri')->getValue() as $value) {
-                  $graph['@type'][] = $value['uri'];
+                $elem['@type'][] = $value['uri'];
               }
             }
           }
           else {
-              $graph['@type'][] = NormalizerBase::escapePrefix($type['value'], $context['namespaces']);
+            $elem['@type'][] = NormalizerBase::escapePrefix($type['value'], $context['namespaces']);
-            }
           }
         }
+        return;
       }
     }
   }