public Builder addEventTypes(
          com.google.storagetransfer.v1.proto.TransferTypes.NotificationConfig.EventType value) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureEventTypesIsMutable();
        eventTypes_.add(value.getNumber());
        onChanged();
        return this;
      }
<pre>
Event types for which a notification is desired. If empty, send
notifications for all event types.
</pre>

<code>repeated .google.storagetransfer.v1.NotificationConfig.EventType event_types = 2;
</code>

@param value The eventTypes to add.
@return This builder for chaining.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java