String (int lineNumber) { // TODO: Check what is the difference in returning "" or null if (!myInfos.isValid(lineNumber)) return ""; CommitInfo info = myInfos.get(lineNumber); if (info == null) return null; SvnFileRevision revision = myRevisionMap.get(info.getRevisionNumber()); if (revision == null) return ""; return escapeString(SvnBundle.message("tooltip.revision.number.message", info.getRevisionNumber(), revision.getCommitMessage())); }