Package org.apache.mahout.cf.taste.impl.model

Examples of org.apache.mahout.cf.taste.impl.model.GenericUserPreferenceArray$PreferenceArrayIterator

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        if (prefValues[i][j] != null) {
          prefsList.add(new GenericPreference(userIDs[i], j, prefValues[i][j].floatValue()));
        }
      }
      if (!prefsList.isEmpty()) {
        result.put(userIDs[i], new GenericUserPreferenceArray(prefsList));
      }
    }
    return new GenericDataModel(result);
  }
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          }
        }
        if (exists) {
          rawData.remove(userID);
          if (length > 1) {
            PreferenceArray newPrefs = new GenericUserPreferenceArray(length - 1);
            for (int i = 0, j = 0; i < length; i++, j++) {
              if (prefs.getItemID(i) == itemID) {
                j--;
              } else {
                newPrefs.set(j, prefs.get(i));
              }
            }
            rawData.put(userID, newPrefs);
          }
          log.info("Removing userID: {} itemID: {}", userID, itemID);
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          }
        }
      }
      if (!exists) {
        if (prefs == null) {
          prefs = new GenericUserPreferenceArray(1);
        } else {
          PreferenceArray newPrefs = new GenericUserPreferenceArray(prefs.length() + 1);
          for (int i = 0, j = 1; i < prefs.length(); i++, j++) {
            newPrefs.set(j, prefs.get(i));
          }
          prefs = newPrefs;
        }
        prefs.setUserID(0, userID);
        prefs.setItemID(0, itemID);
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      List<HColumn<Long,Float>> itemIDColumns = result.getColumns();
      if (itemIDColumns.isEmpty()) {
        throw new NoSuchUserException(userID);
      }
      int size = itemIDColumns.size();
      PreferenceArray prefs = new GenericUserPreferenceArray(size);
      prefs.setUserID(0, userID);
      for (int i = 0; i < size; i++) {
        HColumn<Long,Float> itemIDColumn = itemIDColumns.get(i);
        prefs.setItemID(i, itemIDColumn.getName());
        prefs.setValue(i, itemIDColumn.getValue());
      }
      return prefs;
    }
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    List<Preference> prefsOfUser789 = Lists.newArrayList();
    prefsOfUser789.add(new GenericPreference(789L, 1L, 0.5f));
    prefsOfUser789.add(new GenericPreference(789L, 3L, 1.0f));

    PreferenceArray prefArrayOfUser123 = new GenericUserPreferenceArray(prefsOfUser123);

    FastByIDMap<PreferenceArray> userData = new FastByIDMap<PreferenceArray>();
    userData.put(123L, prefArrayOfUser123);
    userData.put(456L, new GenericUserPreferenceArray(prefsOfUser456));
    userData.put(789L, new GenericUserPreferenceArray(prefsOfUser789));

    DataModel dataModel = new GenericDataModel(userData);

    CandidateItemsStrategy strategy =
        new SamplingCandidateItemsStrategy(1, 1, 1, dataModel.getNumUsers(), dataModel.getNumItems());
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    if (result.isEmpty()) {
      throw new NoSuchUserException(userID);
    }

    SortedMap<byte[], byte[]> families = result.getFamilyMap(ITEMS_CF);
    PreferenceArray prefs = new GenericUserPreferenceArray(families.size());
    prefs.setUserID(0, userID);
    int i = 0;
    for (Map.Entry<byte[], byte[]> entry : families.entrySet()) {
      prefs.setItemID(i, Bytes.toLong(entry.getKey()));
      prefs.setValue(i, Bytes.toFloat(entry.getValue()));
      i++;
    }
    return prefs;
  }
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    long userID = Long.parseLong(tokens[0]);
    int ratingsLeftToRead = Integer.parseInt(tokens[1]);
    int ratingsRead = 0;

    PreferenceArray currentUserPrefs = new GenericUserPreferenceArray(ratingsLeftToRead);
    long[] timestamps = new long[ratingsLeftToRead];

    while (ratingsLeftToRead > 0) {

      line = lineIterator.next();

      // Then a data line. May be 1-4 tokens depending on whether preference info is included (it's not in test data)
      // or whether date info is included (not inluded in track 2). Item ID is always first, and date is the last
      // two fields if it exists.
      tokens = TAB_PATTERN.split(line);
      boolean hasPref = tokens.length == 2 || tokens.length == 4;
      boolean hasDate = tokens.length > 2;

      long itemID = Long.parseLong(tokens[0]);

      currentUserPrefs.setUserID(0, userID);
      currentUserPrefs.setItemID(ratingsRead, itemID);
      if (hasPref) {
        float preference = Float.parseFloat(tokens[1]);
        currentUserPrefs.setValue(ratingsRead, preference);
      }

      if (hasDate) {
        long timestamp;
        if (hasPref) {
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      if (prefs.isEmpty()) {
        throw new NoSuchUserException();
      }

      return new GenericUserPreferenceArray(prefs);

    } catch (SQLException sqle) {
      log.warn("Exception while retrieving user", sqle);
      throw new TasteException(sqle);
    } finally {
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      List<Preference> currentPrefs = new ArrayList<Preference>();
      while (rs.next()) {
        long nextUserID = getLongColumn(rs, 1);
        if (currentUserID != null && !currentUserID.equals(nextUserID)) {
          if (!currentPrefs.isEmpty()) {
            result.put(currentUserID, new GenericUserPreferenceArray(currentPrefs));
            currentPrefs.clear();
          }
        } else {
          currentPrefs.add(buildPreference(rs));
        }
        currentUserID = nextUserID;
      }
      if (!currentPrefs.isEmpty()) {
        result.put(currentUserID, new GenericUserPreferenceArray(currentPrefs));
      }

      return result;

    } catch (SQLException sqle) {
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        if (prefValues[i][j] != null) {
          prefsList.add(new GenericPreference(userIDs[i], j, prefValues[i][j].floatValue()));
        }
      }
      if (!prefsList.isEmpty()) {
        result.put(userIDs[i], new GenericUserPreferenceArray(prefsList));
      }
    }
    return new GenericDataModel(result);
  }
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