ArchiveSearch search = new ArchiveSearch();
search.setParticipants(participant);
search.setIncludeTimestamp(time);
search.setRoom(room);
Collection<Conversation> conversations = archiveSearcher.search(search);
DataForm form = new DataForm(DataForm.Type.result);
FormField field = form.addField();
field.setType(FormField.Type.hidden);