/**
* Extracts specific field values from a complex data object.
*
* @param \Drupal\Core\TypedData\ComplexDataInterface $item
* The item from which fields should be extracted.
* @param \Drupal\search_api\Item\FieldInterface[] $fields
* The field objects into which data should be extracted, keyed by their
* property paths on $item.
*/
public static function extractFields(ComplexDataInterface $item, array $fields)
{
// Figure out which fields are directly on the item and which need to be
// extracted from nested items.
$direct_fields = array();
$nested_fields = array();
foreach (array_keys($fields) as $key) {
if (strpos($key, ':') !== FALSE) {
list($direct, $nested) = explode(':', $key, 2);
$nested_fields[$direct][$nested] = $fields[$key];
} else {
$direct_fields[] = $key;
}
}
// Extract the direct fields.
foreach ($direct_fields as $key) {
try {
self::extractField($item->get($key), $fields[$key]);
} catch (\InvalidArgumentException $e) {
// This can happen with properties added by processors.
// @todo Find a cleaner solution for this.
}
}
// Recurse for all nested fields.
foreach ($nested_fields as $direct => $fields_nested) {
try {
$item_nested = $item->get($direct);
if ($item_nested instanceof DataReferenceInterface) {
$item_nested = $item_nested->getTarget();
}
if ($item_nested instanceof EntityInterface) {
$item_nested = $item_nested->getTypedData();
}
if ($item_nested instanceof ComplexDataInterface && !$item_nested->isEmpty()) {
self::extractFields($item_nested, $fields_nested);
} elseif ($item_nested instanceof ListInterface && !$item_nested->isEmpty()) {
foreach ($item_nested as $list_item) {
self::extractFields($list_item, $fields_nested);
}
}
} catch (\InvalidArgumentException $e) {
// This can happen with properties added by processors.
// @todo Find a cleaner solution for this.
}
}
}
/**
* {@inheritdoc}
*/
public function viewItem(ComplexDataInterface $item, $view_mode, $langcode = NULL)
{
try {
if ($item instanceof EntityAdapter) {
$entity = $item->getValue();
$langcode = $langcode ?: $entity->language()->getId();
return $this->getEntityManager()->getViewBuilder($this->getEntityTypeId())->view($entity, $view_mode, $langcode);
}
} catch (\Exception $e) {
// The most common reason for this would be a
// \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException in
// getViewBuilder(), because the entity type definition doesn't specify a
// view_builder class.
}
return array();
}
