GenerationFileHandler gfh = (GenerationFileHandler) fileHandlers.get(l);
GenerationFileHandler newGfh = gfh.rotate(generationSuffix, "", mergeOld);
if (gfh.shouldManifest()) {
addToManifest((String) newGfh.getFilenameSeries().get(1),
MANIFEST_LOG_FILE, newGfh.shouldManifest());
}
l.removeHandler(gfh);
l.addHandler(newGfh);
fileHandlers.put(l, newGfh);