[egit-dev] API to get diff between Index and specific revision

[Pascal Rapicault <pascal@xxxxxxxxxxxx>]

Hi,

Is there a EGit or JGit API that given a file in Index and a commit id, 
can return the diff between the file contained in index and the file 
contained in the commit id?
At this point, I just need to know the added / removed / changed lines 
and their positions.

Thanks in advance for any insight,

Pascal