in the file outbound-channel-adapter, add the ability to append to a file if the filename given already exists

We have an application that reads XML from a message queue and writes to a flat file. The naming convention we have to use for the flat file limits us to writing one file per second, but the file is allowed to have multiple comma-delimited lines. The filename included the date/time to the second and is dictated by a third party application.

It's not practical to rewrite the entire application in Spring Batch.

Can a change be made to configure file:outbound-channel-adapter to allow me to append to file with the same name as generated by FilenameGenerator?