public UserComment updateEntryComment(
String userId, long partId, long commentId, UserComment userComment) {
Entry entry = dao.get(partId);
if (entry == null) return null;
authorization.canRead(userId, entry);
Comment comment = commentDAO.get(commentId);
if (comment == null) return createEntryComment(userId, partId, userComment);
if (comment.getEntry().getId() != partId) return null;
if (userComment.getMessage() == null || userComment.getMessage().isEmpty()) return null;
comment.setBody(userComment.getMessage());
comment.setModificationTime(new Date());
return commentDAO.update(comment).toDataTransferObject();
}
