+ /**
+ * Calculate the display name.
+ */
+ protected function getUserDisplayName(array $displayNameAttr, array $userDetails, string $defaultValue): string
+ {
+ $displayName = [];
+ foreach ($displayNameAttr as $dnAttr) {
+ $dnComponent = $this->getUserResponseProperty($userDetails, $dnAttr, null);
+ if ($dnComponent !== null) {
+ $displayName[] = $dnComponent;
+ }
+ }
+
+ if (count($displayName) == 0) {
+ $displayName = $defaultValue;
+ } else {
+ $displayName = implode(' ', $displayName);
+ }
+
+ return $displayName;
+ }
+