Add|RemoveNoteComand: Reduce duplicated code

The private method commitNoteMap is in both classes with the same
implementation.

Make it static in AddNoteCommand and reuse it from RemoveNoteCommand.

Change-Id: Ia037bf9efdd94ee7b8d33b41321e9cfd6ea4a6a5
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/AddNoteCommand.java

 				map = NoteMap.read(walk.getObjectReader(), notesCommit);
 			}
 			map.set(id, message, inserter);
-			commitNoteMap(walk, map, notesCommit, inserter,
+			commitNoteMap(repo, notesRef, walk, map, notesCommit, inserter,
 					"Notes added by 'git notes add'"); //$NON-NLS-1$
 			return map.getNote(id);
 		} catch (IOException e) {
 		return this;
 	}
 
-	private void commitNoteMap(RevWalk walk, NoteMap map,
+	static void commitNoteMap(Repository r, String ref, RevWalk walk,
+			NoteMap map,
 			RevCommit notesCommit,
 			ObjectInserter inserter,
 			String msg)
 		// commit the note
 		CommitBuilder builder = new CommitBuilder();
 		builder.setTreeId(map.writeTree(inserter));
-		builder.setAuthor(new PersonIdent(repo));
+		builder.setAuthor(new PersonIdent(r));
 		builder.setCommitter(builder.getAuthor());
 		builder.setMessage(msg);
 		if (notesCommit != null)
 			builder.setParentIds(notesCommit);
 		ObjectId commit = inserter.insert(builder);
 		inserter.flush();
-		RefUpdate refUpdate = repo.updateRef(notesRef);
+		RefUpdate refUpdate = r.updateRef(ref);
 		if (notesCommit != null)
 			refUpdate.setExpectedOldObjectId(notesCommit);
 		else

org.eclipse.jgit/src/org/eclipse/jgit/api/RemoveNoteCommand.java

 
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
-import org.eclipse.jgit.lib.CommitBuilder;
 import org.eclipse.jgit.lib.Constants;
-import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectInserter;
-import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.lib.Ref;
-import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.notes.Note;
 import org.eclipse.jgit.notes.NoteMap;
 				map = NoteMap.read(walk.getObjectReader(), notesCommit);
 			}
 			map.set(id, null, inserter);
-			commitNoteMap(walk, map, notesCommit, inserter,
+			AddNoteCommand.commitNoteMap(repo, notesRef, walk, map, notesCommit,
+					inserter,
 					"Notes removed by 'git notes remove'"); //$NON-NLS-1$
 			return map.getNote(id);
 		} catch (IOException e) {
 		return this;
 	}
 
-	private void commitNoteMap(RevWalk walk, NoteMap map,
-			RevCommit notesCommit,
-			ObjectInserter inserter,
-			String msg)
-			throws IOException {
-		// commit the note
-		CommitBuilder builder = new CommitBuilder();
-		builder.setTreeId(map.writeTree(inserter));
-		builder.setAuthor(new PersonIdent(repo));
-		builder.setCommitter(builder.getAuthor());
-		builder.setMessage(msg);
-		if (notesCommit != null)
-			builder.setParentIds(notesCommit);
-		ObjectId commit = inserter.insert(builder);
-		inserter.flush();
-		RefUpdate refUpdate = repo.updateRef(notesRef);
-		if (notesCommit != null)
-			refUpdate.setExpectedOldObjectId(notesCommit);
-		else
-			refUpdate.setExpectedOldObjectId(ObjectId.zeroId());
-		refUpdate.setNewObjectId(commit);
-		refUpdate.update(walk);
-	}
-
 	/**
 	 * Set the name of the <code>Ref</code> to remove a note from.
 	 *