/**
* @return \Google_Service_Datastore_ReadOptions
* @throws MissingFieldsException
* @throws ReadOptionsException
*/
public function build()
{
if ($this->readConsistency === null && $this->transaction === null) {
throw new MissingFieldsException(self::class, ['$readConsistency or $transaction']);
}
if ($this->readConsistency !== null && $this->transaction !== null) {
throw new ReadOptionsException('Read consistency cannot be set when transaction is set');
}
$readOptions = new \Google_Service_Datastore_ReadOptions();
if ($this->transaction !== null) {
$readOptions->setTransaction($this->transaction);
}
if ($this->readConsistency !== null) {
$readOptions->setReadConsistency($this->readConsistency->value());
}
return $readOptions;
}
