private com.google.protobuf.SingleFieldBuilderV3<
              com.google.storagetransfer.v1.proto.TransferTypes.NotificationConfig,
              com.google.storagetransfer.v1.proto.TransferTypes.NotificationConfig.Builder,
              com.google.storagetransfer.v1.proto.TransferTypes.NotificationConfigOrBuilder>
          getNotificationConfigFieldBuilder() {
        if (notificationConfigBuilder_ == null) {
          notificationConfigBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.storagetransfer.v1.proto.TransferTypes.NotificationConfig,
                  com.google.storagetransfer.v1.proto.TransferTypes.NotificationConfig.Builder,
                  com.google.storagetransfer.v1.proto.TransferTypes.NotificationConfigOrBuilder>(
                  getNotificationConfig(), getParentForChildren(), isClean());
          notificationConfig_ = null;
        }
        return notificationConfigBuilder_;
      }
<pre>
Notification configuration.
</pre>

<code>.google.storagetransfer.v1.NotificationConfig notification_config = 10;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java