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

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

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    List<Preference> prefsOfUser789 = new ArrayList<Preference>();
    prefsOfUser456.add(new GenericPreference(789L, 1L, 0.5f));
    prefsOfUser456.add(new GenericPreference(789L, 3L, 1.0f));

    FastByIDMap<PreferenceArray> userData = new FastByIDMap<PreferenceArray>();
    userData.put(123L, new GenericUserPreferenceArray(prefsOfUser123));
    userData.put(456L, new GenericUserPreferenceArray(prefsOfUser456));
    userData.put(789L, new GenericUserPreferenceArray(prefsOfUser789));

    DataModel dataModel = new GenericDataModel(userData);

    CandidateItemsStrategy strategy = new SamplingCandidateItemsStrategy(1, 1);
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        if (relevantItemIDs.contains(pref.getItemID())) {
          iterator.remove();
        }
      }
      if (!prefs2.isEmpty()) {
        trainingUsers.put(userID2, new GenericUserPreferenceArray(prefs2));
      }
    } else {
      trainingUsers.put(userID2, prefs2Array);
    }
  }
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        }
        testPrefs.add(newPref);
      }
    }
    if (trainingPrefs != null) {
      trainingUsers.put(userID, new GenericUserPreferenceArray(trainingPrefs));
      if (testPrefs != null) {
        testUserPrefs.put(userID, new GenericUserPreferenceArray(testPrefs));
      }
    }
  }
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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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          }
          if (exists) {
            if (length == 1) {
              data.remove(userID);
            } else {
              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));
                }
              }
            }
          }
        }

        removeTimestamp(userID, itemID, timestamps);

      } else {

        float preferenceValue = Float.parseFloat(preferenceValueString);

        boolean exists = false;
        if (prefs != null) {
          for (int i = 0; i < prefs.length(); i++) {
            if (prefs.getItemID(i) == itemID) {
              exists = true;
              prefs.setValue(i, preferenceValue);
              break;
            }
          }
        }

        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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      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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      Long currentUserID = null;
      List<Preference> currentPrefs = new ArrayList<Preference>();
      while (rs.next()) {
        long nextUserID = getLongColumn(rs, 1);
        if ((currentUserID != null) && !currentUserID.equals(nextUserID) && !currentPrefs.isEmpty()) {
          result.put(currentUserID, new GenericUserPreferenceArray(currentPrefs));
          currentPrefs.clear();
        }
        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 (prefs.isEmpty()) {
        throw new NoSuchUserException(userID);
      }

      return new GenericUserPreferenceArray(prefs);

    } catch (SQLException sqle) {
      log.warn("Exception while retrieving user", sqle);
      throw new TasteException(sqle);
    } finally {
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