get name of file in mapper output directory

[Mark question]

Hi,

  I'm running a job with maps only  and I want by end of each map
(ie.Close() function) to open the file that the current map has wrote using
its output.collector.

  I know "job.getWorkingDirectory()"  would give me the parent path of the
file written, but how to get the full path or the name (ie. part-00000 or
part-00001).

Thanks,
Mark