/**
* @param string $action
* @param EntityId $entityId
* @param Diff $diff
* @param array $fields
*
* @return EntityChange
*/
private function newEntityChange($action, EntityId $entityId, Diff $diff, array $fields)
{
/** @var EntityChange $instance */
$instance = new ItemChange($fields);
if (!$instance->hasField('object_id')) {
$instance->setField('object_id', $entityId->getSerialization());
}
if (!$instance->hasField('info')) {
$instance->setField('info', array());
}
// Note: the change type determines how the client will
// instantiate and handle the change
$type = 'wikibase-' . $entityId->getEntityType() . '~' . $action;
$instance->setField('type', $type);
$instance->setDiff($diff);
return $instance;
}
