why do they use translate_name hook in mod_file_cache.c?

[Zeus Capricorn]

Hi,folks.
   i am new here .

   When i read the mod_file_cache.c in the apache source code,i found that
they use translate_name hook to set the match.But i want to know why they do
not use handler hook to set the match and get it directly? it seems that the
only thing translate_name hook do is to set the match and send it to the
next hook.

   Am i right?

   i need some advice.

   Thanks in advance.