Package org.apache.mahout.cf.taste.common

Examples of org.apache.mahout.cf.taste.common.NoSuchUserException

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      SliceQuery<Long,Long,byte[]> query = buildNoValueSliceQuery(USERS_CF);
      query.setKey(userID);
      FastIDSet itemIDs = new FastIDSet();
      ColumnSlice<Long,byte[]> result = query.execute().get();
      if (result == null) {
        throw new NoSuchUserException(userID);
      }
      List<HColumn<Long,byte[]>> columns = result.getColumns();
      if (columns.isEmpty()) {
        throw new NoSuchUserException(userID);
      }
      for (HColumn<Long,?> itemIDColumn : columns) {
        itemIDs.add(itemIDColumn.getName());
      }
      return itemIDs;
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    } catch (IOException e) {
      throw new TasteException("Failed to retrieve user preferences from HBase", e);
    }

    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);
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    } catch (IOException e) {
      throw new TasteException("Failed to retrieve item IDs from HBase", e);
    }

    if (result.isEmpty()) {
      throw new NoSuchUserException(userID);
    }

    SortedMap<byte[],byte[]> families = result.getFamilyMap(ITEMS_CF);
    FastIDSet ids = new FastIDSet(families.size());
    for (byte[] family : families.keySet()) {
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    } catch (IOException e) {
      throw new TasteException("Failed to retrieve user preferences from HBase", e);
    }

    if (result.isEmpty()) {
      throw new NoSuchUserException(userID);
    }

    if (result.containsColumn(ITEMS_CF, Bytes.toBytes(itemID))) {
      return Bytes.toFloat(result.getValue(ITEMS_CF, Bytes.toBytes(itemID)));
    } else {
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    } catch (IOException e) {
      throw new TasteException("Failed to retrieve user preferences from HBase", e);
    }

    if (result.isEmpty()) {
      throw new NoSuchUserException(userID);
    }

    if (result.containsColumn(ITEMS_CF, Bytes.toBytes(itemID))) {
      KeyValue kv = result.getColumnLatest(ITEMS_CF, Bytes.toBytes(itemID));
      return kv.getTimestamp();
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      while (rs.next()) {
        prefs.add(buildPreference(rs));
      }

      if (prefs.isEmpty()) {
        throw new NoSuchUserException();
      }

      return new GenericUserPreferenceArray(prefs);

    } catch (SQLException sqle) {
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      while (rs.next()) {
        result.add(getLongColumn(rs, 2));
      }

      if (result.isEmpty()) {
        throw new NoSuchUserException();
      }

      return result;

    } catch (SQLException sqle) {
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  @Override
  public float estimatePreference(long userID, long itemID) throws TasteException {
    Integer useridx = userMap.get(userID);
    if (useridx == null) {
      throw new NoSuchUserException();
    }
    Integer itemidx = itemMap.get(itemID);
    if (itemidx == null) {
      throw new NoSuchItemException();
    }
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  /** @throws NoSuchUserException if there is no such user */
  @Override
  public PreferenceArray getPreferencesFromUser(long userID) throws NoSuchUserException {
    PreferenceArray prefs = preferenceFromUsers.get(userID);
    if (prefs == null) {
      throw new NoSuchUserException();
    }
    return prefs;
  }
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  /** @throws NoSuchUserException if there is no such user */
  @Override
  public PreferenceArray getPreferencesFromUser(long userID) throws NoSuchUserException {
    FastIDSet itemIDs = preferenceFromUsers.get(userID);
    if (itemIDs == null) {
      throw new NoSuchUserException();
    }
    PreferenceArray prefArray = new BooleanUserPreferenceArray(itemIDs.size());
    int i = 0;
    LongPrimitiveIterator it = itemIDs.iterator();
    while (it.hasNext()) {
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