public void writeRecord(String stnName, Date obsDate, StructureData sdata) throws IOException {
    StationTracker stnTracker = stationMap.get(stnName);
    ProfileTracker proTracker = stnTracker.profileMap.get(obsDate);

    if (proTracker == null) {
      proTracker = new ProfileTracker(profileIndex);
      stnTracker.profileMap.put(obsDate, proTracker);

      stnTracker.link.add(profileIndex);
      stnTracker.lastChild = profileIndex;
      stnTracker.numChildren++;

      try {
        originTime[0] = profileIndex; // 2d index
        timeArray.set(0, dateFormatter.toDateTimeStringISO(obsDate));
        parentArray.set(0, stnTracker.parent_index);
        ncfile.writeStringData(timeName, originTime, timeArray);
        ncfile.write(parentStationIndex, originTime, parentArray);
      } catch (InvalidRangeException e) {
        e.printStackTrace();
        throw new IllegalStateException(e);
      }

      profileIndex++;
    }

    // needs to be wrapped as an ArrayStructure, even though we are only writing one at a time.
    ArrayStructureW sArray = new ArrayStructureW(sdata.getStructureMembers(), new int[] {1});
    sArray.setStructureData(sdata, 0);

    // track the min and max date
    if ((minDate == null) || minDate.after(obsDate)) minDate = obsDate;
    if ((maxDate == null) || maxDate.before(obsDate)) maxDate = obsDate;

    timeArray.set(0, dateFormatter.toDateTimeStringISO(obsDate));
    parentArray.set(0, proTracker.parent_index);

    proTracker.link.add(recno);
    proTracker.lastChild = recno; // not currently used
    proTracker.numChildren++;

    // write the recno record
    origin[0] = recno; // 1d index
    originTime[0] = recno; // 2d index
    try {
      ncfile.write("record", origin, sArray);
      ncfile.write(parentProfileIndex, originTime, parentArray);
    } catch (InvalidRangeException e) {
      e.printStackTrace();
      throw new IllegalStateException(e);
    }

    recno++;
  }
Exemplo n.º 2
0
 /**
  * Remove all files with date < cutoff.
  *
  * @param cutoff earliest date to allow
  * @param sbuff write results here, null is ok.
  */
 public static void cleanCache(Date cutoff, StringBuilder sbuff) {
   if (sbuff != null) sbuff.append("CleanCache files before ").append(cutoff).append("\n");
   File dir = new File(root);
   for (File file : dir.listFiles()) {
     Date lastMod = new Date(file.lastModified());
     if (lastMod.before(cutoff)) {
       file.delete();
       if (sbuff != null)
         sbuff.append(" delete ").append(file).append(" (").append(lastMod).append(")\n");
     }
   }
 }
Exemplo n.º 3
0
  /**
   * Searches for contact ids in history of recent messages.
   *
   * @param provider
   * @param after
   * @return
   */
  List<String> getRecentContactIDs(String provider, Date after) {
    List<String> res = new ArrayList<String>();

    try {
      History history = getHistory();

      if (history != null) {
        Iterator<HistoryRecord> recs = history.getReader().findLast(NUMBER_OF_MSGS_IN_HISTORY);
        SimpleDateFormat sdf = new SimpleDateFormat(HistoryService.DATE_FORMAT);

        while (recs.hasNext()) {
          HistoryRecord hr = recs.next();

          String contact = null;
          String recordProvider = null;
          Date timestamp = null;

          for (int i = 0; i < hr.getPropertyNames().length; i++) {
            String propName = hr.getPropertyNames()[i];

            if (propName.equals(STRUCTURE_NAMES[0])) recordProvider = hr.getPropertyValues()[i];
            else if (propName.equals(STRUCTURE_NAMES[1])) contact = hr.getPropertyValues()[i];
            else if (propName.equals(STRUCTURE_NAMES[2])) {
              try {
                timestamp = sdf.parse(hr.getPropertyValues()[i]);
              } catch (ParseException e) {
                timestamp = new Date(Long.parseLong(hr.getPropertyValues()[i]));
              }
            }
          }

          if (recordProvider == null || contact == null) continue;

          if (after != null && timestamp != null && timestamp.before(after)) continue;

          if (recordProvider.equals(provider)) res.add(contact);
        }
      }
    } catch (IOException ex) {
      logger.error("cannot create recent_messages history", ex);
    }

    return res;
  }
Exemplo n.º 4
0
  // Compute date intervals, working backwards from latestDate, until earliestDate is covered
  // most recent interval is interval 0.
  private static List<Pair<Date, Date>> computeDateIntervals(Date earliestDate, Date latestDate) {
    int DAYS_PER_INTERVAL = 30;
    List<Pair<Date, Date>> intervals = new ArrayList<Pair<Date, Date>>();
    {
      JSPHelper.log.info("computing time intervals");
      Date closingDate = latestDate;

      JSPHelper.log.info(
          "closing = " + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(closingDate));
      if (earliestDate == null || closingDate == null) return intervals;

      while (earliestDate.before(closingDate)) {
        Calendar cal = new GregorianCalendar();
        cal.setTime(closingDate);
        // scroll to the beginning of this month
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        Date endDate = cal.getTime();

        // scroll back by DAYS_PER_INTERVAL days
        cal.add(
            Calendar.DATE,
            (1
                - DAYS_PER_INTERVAL)); // 1- because we want from 0:00 of first date to 23:59 of
                                       // last date
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        Date startDate = cal.getTime();

        intervals.add(new Pair<Date, Date>(startDate, endDate));
        // ok we got an interval

        // closing date for the next interval is 1 day before endDate
        cal.add(Calendar.DATE, -1);
        closingDate = cal.getTime();
      }
    }
    return intervals;
  }
Exemplo n.º 5
0
  /** Generates person names tests from the given archive. @throws IOException */
  public void generatePersonNameQuestions(
      Archive archive,
      NERModel nerModel,
      Collection<EmailDocument> allDocs,
      Lexicon lex,
      int numClues)
      throws IOException, GeneralSecurityException, ClassNotFoundException, ReadContentsException,
          ParseException {
    this.archive = archive;
    questions = new ArrayList<>();
    ArchiveCluer cluer = new ArchiveCluer(null, archive, nerModel, null, lex);

    tabooCluesSet = new LinkedHashSet<>();
    archive.assignThreadIds();

    List<ClueEvaluator> evaluators = getDefaultEvals();

    List<Document> docs = archive.getAllDocs();
    Multimap<Contact, EmailDocument> contactToMessages = LinkedHashMultimap.create();
    Multimap<Contact, Long> contactToThreadIds = LinkedHashMultimap.create();

    // sort by date
    Collections.sort(docs);

    Date earliestDate = null, latestDate = null;
    Map<Contact, Date> contactToLatestDate = new LinkedHashMap<>();

    // compute earliest and latest date across all messages in corpus
    for (Document doc : docs) {
      EmailDocument ed = (EmailDocument) doc;

      if (earliestDate == null || ed.date.before(earliestDate)) earliestDate = ed.date;
      if (latestDate == null || ed.date.after(latestDate)) latestDate = ed.date;
    }
    JSPHelper.log.info(
        "===================\nStarting to generate person names memory questions from "
            + docs.size()
            + " messages with "
            + numClues
            + " questions"
            + ", earliest date = "
            + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(earliestDate)
            + " latest date = "
            + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(latestDate));

    Set<Integer> tabooSentenceHashes = new LinkedHashSet<>();

    // create hashes of all sentences seen at least twice (case insensitive, lower cased)
    {
      Set<Integer> hashesSeen = new LinkedHashSet<>();
      for (Document d : docs) {
        String contents = archive.getContents(d, true);
        String cleanedContents = EmailUtils.cleanupEmailMessage(contents);
        SentenceTokenizer st = new SentenceTokenizer(cleanedContents);
        while (st.hasMoreSentences()) {
          String sentence = st.nextSentence();
          sentence = canonicalizeSentence(sentence);
          int hashCode = sentence.hashCode();
          if (hashesSeen.contains(hashCode)) {
            tabooSentenceHashes.add(hashCode);
            log.info("Marking sentence as taboo: " + sentence);
          } else hashesSeen.add(hashCode);
        }
      }
    }

    // compute contactToLatestDate that contact has been seen on
    for (Document doc : docs) {
      EmailDocument ed = (EmailDocument) doc;
      // discard doc if it is not a sent mail
      if ((ed.sentOrReceived(archive.addressBook) & EmailDocument.SENT_MASK) == 0) continue;

      for (Contact c : ed.getParticipatingContactsExceptOwn(archive.addressBook)) {
        Date currentLatestDate = contactToLatestDate.get(c);
        if (currentLatestDate == null || currentLatestDate.before(ed.date))
          contactToLatestDate.put(c, ed.date);
        contactToMessages.put(c, ed);
        contactToThreadIds.put(c, ed.threadID);
      }
    }

    log.info("We are considering " + contactToLatestDate.size() + " contacts");

    Date currentDate = new Date();
    List<Pair<Date, Date>> intervals =
        computeDateIntervals(earliestDate, currentDate); // go back from current date
    // intervals[0] is the most recent.
    JSPHelper.log.info("done computing " + intervals.size() + " intervals");
    for (Pair<Date, Date> p : intervals)
      JSPHelper.log.info(
          "Interval: "
              + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(p.getFirst())
              + " - "
              + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(p.getSecond()));

    int cluesPerInterval =
        (numClues > 0 && intervals.size() > 0)
            ? (numClues + intervals.size() - 1) / intervals.size()
            : 0;
    JSPHelper.log.info(
        "Will try to generate " + Util.pluralize(cluesPerInterval, "questions") + " per interval");

    Multimap<Integer, Contact> intervalToContacts = LinkedHashMultimap.create();

    // nSent is the number of sentences allowed in a clue text
    int nSent = 2;
    for (Contact c : contactToLatestDate.keySet()) {
      Date lastSeenDate = contactToLatestDate.get(c);

      // which interval does this date belong to? we'll assign this contact in that interval in the
      // intervalToContacts map
      int interval = -1;
      Date intervalStart = null, intervalEnd = null;
      {
        int i = 0;
        for (Pair<Date, Date> p : intervals) {
          intervalStart = p.getFirst();
          intervalEnd = p.getSecond();

          if ((intervalStart.before(lastSeenDate) && intervalEnd.after(lastSeenDate))
              || intervalStart.equals(lastSeenDate)
              || intervalEnd.equals(lastSeenDate)) {
            interval = i;
            break;
          }
          i++;
        }
      }

      if (interval < 0 || interval == intervals.size()) {
        JSPHelper.log.info(
            "What, no interval!? for "
                + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(lastSeenDate));
        continue;
      }

      intervalToContacts.put(interval, c);
    }

    log.info("Interval information (interval 0 is the most recent):");
    for (int interval = 0; interval < intervals.size(); interval++) {
      Collection<Contact> contacts = intervalToContacts.get(interval);
      int nContactsForThisInterval = (contacts == null) ? 0 : contacts.size();
      log.info(
          "In interval "
              + interval
              + " there are "
              + Util.pluralize(nContactsForThisInterval, "candidate contact")
              + " who were last seen in this interval");
    }

    for (int interval = 0; interval < intervals.size(); interval++) {
      Date intervalStart = intervals.get(interval).getFirst();
      Date intervalEnd = intervals.get(interval).getSecond();
      Collection<Contact> candidateContactsForThisInterval = intervalToContacts.get(interval);
      if (candidateContactsForThisInterval == null) {
        log.info("Skipping interval " + interval + " because there are no contacts");
        continue;
      }

      Map<Clue, Contact> clueToContact = new LinkedHashMap<>();
      log.info("=======\nGenerating questions for interval " + interval);

      outer:
      for (Contact c : candidateContactsForThisInterval) {
        String name = c.pickBestName();
        if (name.length() < 2) // could also check if alphanumberic only
        continue outer;

        // ignore contact if name does not contain all alphabets. Even a period is not allowed. only
        // space is allowed.
        for (char ch : name.toCharArray()) {
          if (!Character.isAlphabetic(ch) && !Character.isSpaceChar(ch)) continue outer;
        }

        Clue clue =
            cluer.createPersonNameClue(
                c,
                evaluators,
                nerModel,
                intervalStart,
                intervalEnd,
                nSent,
                archive,
                tabooSentenceHashes);
        if (clue != null) clueToContact.put(clue, c);
      }

      List<Clue> clueList = new ArrayList(clueToContact.keySet());
      Collections.sort(clueList);
      List<Clue> selectedClues = new ArrayList<>();
      for (int i = 0; i < cluesPerInterval && i < clueList.size(); i++) {
        selectedClues.add(clueList.get(i));
      }

      log.info(
          "For interval "
              + interval
              + " selected "
              + selectedClues.size()
              + " contacts out of "
              + clueList.size()
              + " possible candidates.");
      //            for (Clue c: clueList)
      //               log.info ("Clue candidate for " + clueToContact.get(c).pickBestName() + "
      // score = " + c.clueStats.finalScore+ " clue is " + c );
      //          for (Clue c: selectedClues)
      //             log.info ("Selected clue: " + clueToContact.get(c).pickBestName() + " score = "
      // + c.clueStats.finalScore+ " clue is " + c);

      for (Clue selectedClue : selectedClues) {
        Contact c = clueToContact.get(selectedClue);
        String name = c.pickBestName();

        List<Integer> lengthList = Crossword.convertToWord(name).getSecond();
        String lengthDescr = "";
        if (lengthList.size() > 1) lengthDescr += Integer.toString(lengthList.size()) + " words: ";

        for (Integer i : lengthList) {
          lengthDescr += Util.pluralize(i, "letter") + ", ";
        }
        lengthDescr =
            lengthDescr.substring(0, lengthDescr.length() - 2); // subtract the extra comma.

        ClueInfo ci = new ClueInfo();
        ci.lastSeenDate = contactToLatestDate.get(c);
        ci.nMessages = contactToThreadIds.get(c).size();
        ci.nThreads = contactToThreadIds.get(c).size();

        questions.add(new MemoryQuestion(this, name, selectedClue, 1, lengthDescr));
      }
    }

    log.info(questions.size() + " questions generated");

    log.info("Top candidates are:");

    // sort q's by clue score
    Collections.sort(questions);

    //		log.info("Based on clue score, top answers:");
    //		for (MemoryQuestion mq: questions)
    //			log.info (mq.correctAnswer + " times= clue=" + mq.clue.clue);

    int count = 0;
    for (MemoryQuestion mq : questions) {
      mq.setQuestionNum(count++);
    }

    // log the questions as well, just in case we don't get to the final point due to user fatigue
    // or crashes
    logStats("questions.final", false);
  }
Exemplo n.º 6
0
  /**
   * Generates list of questions and stores it in the current instance of MemoryStudy We handle two
   * kinds of questions namely, person names tests and non-person name tests. Non-person name test
   * is a fill in the blank kind where the blank is to be filled with the correct non-person entity
   * to complete the sentence person name test is to guess the person in correspondent list based on
   * some distinctive sentences in the mail
   *
   * @param maxInt - max. number of questions from a interval
   * @throws IOException
   */
  public void generateQuestions(
      Archive archive,
      NERModel nerModel,
      Collection<EmailDocument> allDocs,
      Lexicon lex,
      int maxInt,
      boolean personTest)
      throws IOException, GeneralSecurityException, ClassNotFoundException, ReadContentsException,
          ParseException {
    this.archive = archive;
    if (allDocs == null) allDocs = (Collection) archive.getAllDocs();
    questions = new ArrayList<>();
    ArchiveCluer cluer = new ArchiveCluer(null, archive, nerModel, null, lex);

    Short[] itypes =
        new Short[] {
          FeatureDictionary.BUILDING,
          FeatureDictionary.PLACE,
          FeatureDictionary.RIVER,
          FeatureDictionary.ROAD,
          FeatureDictionary.UNIVERSITY,
          FeatureDictionary.MOUNTAIN,
          FeatureDictionary.AIRPORT,
          FeatureDictionary.ISLAND,
          FeatureDictionary.MUSEUM,
          FeatureDictionary.BRIDGE,
          FeatureDictionary.AIRLINE,
          FeatureDictionary.THEATRE,
          FeatureDictionary.LIBRARY,
          FeatureDictionary.LAWFIRM,
          FeatureDictionary.GOVAGENCY
        };
    double CUTOFF = 0.001;
    tabooCluesSet = new LinkedHashSet<>();
    archive.assignThreadIds();

    List<Document> docs = archive.getAllDocs();
    Map<String, Date> entityToLastDate = new LinkedHashMap<>();
    Multimap<String, EmailDocument> entityToMessages = LinkedHashMultimap.create();
    Multimap<String, Long> entityToThreads = LinkedHashMultimap.create();
    Multimap<String, String> ceToDisplayEntity = LinkedHashMultimap.create();

    int di = 0;

    // sort by date
    Collections.sort(docs);

    Set<String> ownerNames = archive.ownerNames;
    Date earliestDate = null, latestDate = null;
    Set<String> allEntities = new LinkedHashSet<>();
    for (Document doc : docs) {
      EmailDocument ed = (EmailDocument) doc;
      if (earliestDate == null || ed.date.before(earliestDate)) earliestDate = ed.date;
      if (latestDate == null || ed.date.after(latestDate)) latestDate = ed.date;

      List<String> entities = new ArrayList<>();
      if (!personTest) {
        entities.addAll(
            Arrays.asList(archive.getAllNamesInDoc(doc, true))
                .stream()
                .filter(n -> n.typeScore > CUTOFF)
                .map(n -> n.text)
                .collect(Collectors.toList()));
      } else {
        // do not consider mailing lists
        if (ed.sentToMailingLists != null && ed.sentToMailingLists.length > 0) continue;
        // discard doc if it is not a sent mail
        if ((ed.sentOrReceived(archive.addressBook) & EmailDocument.SENT_MASK) == 0) continue;

        List<Address> addrs = new ArrayList<>();
        if (ed.to != null) for (Address addr : ed.to) addrs.add(addr);

        List<String> names = new ArrayList<>();
        for (Address addr : addrs) {
          Contact c = archive.addressBook.lookupByAddress(addr);
          names.add(c.pickBestName());
        }

        for (String name : names) {
          if (!ownerNames.contains(name) && !DictUtils.hasDictionaryWord(name)) {
            entities.add(name);
          }
        }
      }
      allEntities.addAll(entities);

      // get entities
      for (String e : entities) {
        if (Util.nullOrEmpty(e)) continue;
        e = e.replaceAll("^\\W+|\\W+$", "");
        if (e.length() > 10 && e.toUpperCase().equals(e))
          continue; // all upper case, more than 10 letters, you're out.

        String ce = DictUtils.canonicalize(e); // canonicalize
        if (ce == null) {
          JSPHelper.log.info("Dropping entity: " + e);
          continue;
        }

        ceToDisplayEntity.put(ce, e);
        entityToLastDate.put(ce, ed.date);
        entityToMessages.put(ce, ed);
        entityToThreads.put(ce, ed.threadID);
      }

      if ((++di) % 1000 == 0) log.info(di + " of " + docs.size() + " messages processed...<br/>");
    }
    log.info(
        "Considered #"
            + allEntities.size()
            + " unique entities and #"
            + ceToDisplayEntity.size()
            + " good ones in #"
            + docs.size()
            + " docs<br>");
    log.info("Owner Names: " + ownerNames);
    JSPHelper.log.info(
        "Considered #"
            + allEntities.size()
            + " unique entities and #"
            + ceToDisplayEntity.size()
            + " good ones in #"
            + docs.size()
            + "docs");

    JSPHelper.log.info(
        "earliest date = "
            + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(earliestDate));
    JSPHelper.log.info(
        "latest date = " + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(latestDate));

    Multimap<String, String> tokenToCE = LinkedHashMultimap.create();
    for (String ce : ceToDisplayEntity.keySet()) {
      List<String> tokens = Util.tokenize(ce);
      for (String t : tokens) tokenToCE.put(t, ce);
    }

    // Compute date intervals
    int DAYS_PER_INTERVAL = 30;
    List<Pair<Date, Date>> intervals = new ArrayList<Pair<Date, Date>>();
    {
      JSPHelper.log.info("computing time intervals");
      Date closingDate = latestDate;

      JSPHelper.log.info(
          "closing = " + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(closingDate));
      while (earliestDate.before(closingDate)) {
        Calendar cal = new GregorianCalendar();
        cal.setTime(closingDate); // this is the time of the last sighting of the term
        // scroll to the beginning of this month
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        Date endDate = cal.getTime();

        cal.add(
            Calendar.DATE,
            (1
                - DAYS_PER_INTERVAL)); // 1- because we want from 0:00 of first date to 23:59 of
                                       // last date
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        Date startDate = cal.getTime();

        intervals.add(new Pair<Date, Date>(startDate, endDate));
        // ok we got an interval

        // closing date for the next interval is 1 day before endDate
        cal.add(Calendar.DATE, -1);
        closingDate = cal.getTime();
      }
      JSPHelper.log.info("done computing intervals, #time intervals: " + intervals.size());
      for (Pair<Date, Date> p : intervals)
        JSPHelper.log.info(
            "Interval: "
                + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(p.getFirst())
                + " - "
                + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(p.getSecond()));
    }

    // initialize clueInfos to empty lists
    List<ClueInfo> clueInfos[] = new ArrayList[intervals.size()];
    for (int i = 0; i < intervals.size(); i++) {
      clueInfos[i] = new ArrayList<ClueInfo>();
    }

    Map<Integer, Integer> intervalCount = new LinkedHashMap<>();
    // nSent is the number of sentences allowed in a clue text
    int nvalidclues = 0, nSent = 2;
    // generate clueInfos for each entity
    for (String ce : entityToLastDate.keySet()) {
      Date lastSeenDate = entityToLastDate.get(ce);

      // compute displayEntity (which has red for core words) and fullAnswer, which is a simple
      // string
      String fullAnswer = "";
      {
        List<String> tokens = Util.tokenize(ceToDisplayEntity.get(ce).iterator().next());
        for (String t : tokens) {
          if (EnglishDictionary.stopWords.contains(t.toLowerCase())) continue;
          fullAnswer += t + " ";
        }
        fullAnswer = fullAnswer.trim();
      }
      // dont want the answer to be scored low just because it has extra non-word chars in the begin
      // or end
      fullAnswer = fullAnswer.replaceAll("^\\W+|\\W+$", "");

      // which interval does this date belong to?
      int interval = -1;
      Date intervalStart = null, intervalEnd = null;
      {
        int i = 0;
        for (Pair<Date, Date> p : intervals) {
          intervalStart = p.getFirst();
          intervalEnd = p.getSecond();

          if ((intervalStart.before(lastSeenDate) && intervalEnd.after(lastSeenDate))
              || intervalStart.equals(lastSeenDate)
              || intervalEnd.equals(lastSeenDate)) {
            interval = i;
            break;
          }
          i++;
        }
      }
      if (interval < 0 || interval == intervals.size())
        JSPHelper.log.info(
            "What, no interval!? for "
                + edu.stanford.muse.email.CalendarUtil.formatDateForDisplay(lastSeenDate));
      if (!intervalCount.containsKey(interval)) intervalCount.put(interval, 0);
      if (intervalCount.get(interval) > maxInt) continue;
      intervalCount.put(interval, intervalCount.get(interval) + 1);

      List<Integer> lengthList = Crossword.convertToWord(fullAnswer).getSecond();
      String lengthDescr = "";
      if (lengthList.size() > 1) lengthDescr += Integer.toString(lengthList.size()) + " words: ";

      for (Integer i : lengthList) {
        lengthDescr += Util.pluralize(i, "letter") + ", ";
      }
      lengthDescr = lengthDescr.substring(0, lengthDescr.length() - 2); // subtract the extra comma.

      ClueInfo ci = new ClueInfo();
      ci.link = "../browse?term=\"" + fullAnswer + "\"&sort_by=recent&searchType=original";
      ci.lastSeenDate = lastSeenDate;
      ci.nMessages = entityToMessages.get(ce).size();
      ci.nThreads = entityToThreads.get(ce).size();

      // TODO: we are doing default initialisation of evaluators by setting it to null below, it is
      // more appropriate to consider it as an argument for this method
      Clue clue =
          cluer.createClue(
              fullAnswer,
              (personTest
                  ? ArchiveCluer.QuestionType.GUESS_CORRESPONDENT
                  : ArchiveCluer.QuestionType.FILL_IN_THE_BLANK),
              null,
              tabooCluesSet,
              null,
              intervalStart,
              intervalEnd,
              nSent,
              archive);
      if (clue != null) ci.clues = new Clue[] {clue};

      if (ci.clues == null || ci.clues.length == 0 || clue == null) {
        JSPHelper.log.warn("Did not find any clue for: " + fullAnswer);
      } else {
        // is the times value of the clue important?
        questions.add(new MemoryQuestion(this, fullAnswer, clue, 1, lengthDescr));
        nvalidclues++;
        // makes sure that the clue with the same statement is not generated again
        tabooCluesSet.add(clue.clue);
      }
      clueInfos[interval].add(ci);
    }
    log.info("Found valid clues for " + nvalidclues + " answers");
    JSPHelper.log.info("Found valid clues for " + nvalidclues + " answers");

    log.info("Top candidates are:");
    for (MemoryQuestion mq : questions)
      log.info(mq.correctAnswer + " times=" + mq.stats.nMessagesWithAnswer);

    // sort q's by clue score
    Collections.sort(questions);

    //		log.info("Based on clue score, top answers:");
    //		for (MemoryQuestion mq: questions)
    //			log.info (mq.correctAnswer + " times= clue=" + mq.clue.clue);

    // now we have up to 2*N questions, sorted by cluescore.
    // drop ones that are prefix/suffix of another, and cap to N
    int prev_size = questions.size();

    int new_size = questions.size();

    //	log.info ("#questions before prefix-suffix elim: " + prev_size + " after: " + new_size);

    int count = 0;
    for (MemoryQuestion mq : questions) {
      mq.setQuestionNum(count++);
    }

    // log the questions as well, just in case we don't get to the final point due to user fatigue
    // or crashes
    logStats("questions.final", false);
  }