Example #1
0
    private final void populateFieldFromMapTypeFamily(
        T entity, Field field, KijiColumn column, KijiRowData row)
        throws IOException, IllegalAccessException {

      LOG.debug("Populating field '{}' from map-type family '{}'.", field, column.family());

      if (column.pageSize() > 0) {
        // Field is a closeable iterator of map-family entries (qualifier, timestamp, value).
        LOG.debug(
            "Populating field '{}' from paging-enabled map-type family '{}'.",
            field,
            column.family());
        final MapFamilyVersionIterator<?> iterator =
            new MapFamilyVersionIterator<Object>(
                row, column.family(), column.pageSize(), column.pageSize());
        field.set(entity, iterator);

      } else if (column.maxVersions() == 1) {
        // Field is a map: qualifier -> single value:

        LOG.debug("Populating single version map field '{}'.", field);
        Object value = null;

        if (field.getType() == KijiCellIterator.class) {
          Iterator<KijiCell<Object>> it = row.iterator(column.family());
          value = new KijiCellIterator<Object>(it);
        } else if (field.getType() == MapTypeCell.class) {
          value = new MapTypeCell<Object>(row.getMostRecentCells(column.family()));
        } else if (field.getType() == MapTypeValue.class) {
          value = new MapTypeValue<Object>(row.getMostRecentValues(column.family()));
        }
        field.set(entity, value);

      } else {
        // Field is a map: qualifier -> time-series
        LOG.debug("Populating map field '{}'.", field);
        Object value = null;
        if (field.getType() == KijiCellIterator.class) {
          Iterator<KijiCell<Object>> it = row.iterator(column.family());
          value = new KijiCellIterator<Object>(it);
        } else if (field.getType() == TSMapTypeValue.class) {
          // TODO: ARGH. This is awful.
          TSMapTypeValue<Object> tsValues = new TSMapTypeValue<Object>();
          for (String s : row.getQualifiers(column.family())) {
            final TimeSeries<Object> timeseries = new TimeSeries<Object>();
            for (final KijiCell<Object> cell : row.asIterable(column.family(), s)) {
              timeseries.put(cell.getTimestamp(), cell.getData());
            }
            tsValues.put(s, timeseries);
          }
          value = tsValues;
        }
        field.set(entity, value);
      }
    }
Example #2
0
    private final void populateFieldFromFullyQualifiedColumn(
        T entity, Field field, KijiColumn column, KijiRowData row)
        throws IOException, IllegalAccessException {

      if (column.maxVersions() == 1) {
        // Field represents a single value from a fully-qualified column:
        LOG.debug(
            "Populating field '{}' from column '{}:{}'.",
            field,
            column.family(),
            column.qualifier());
        KijiCell<?> cell = row.getMostRecentCell(column.family(), column.qualifier());
        if (cell == null) return;
        Object value = cell.getData();

        if (field.getType() == KijiCell.class) {
          value = cell;
        } else if (field.getType() == String.class && value != null) {
          value = value.toString();
        }

        // If there is no cell for a field with a primitive type, use the default value:
        if ((null == value) && field.getType().isPrimitive()) {
          value = Defaults.defaultValue(field.getType());
        }

        field.set(entity, value);
      } else {
        // Field represents a time-series from a fully-qualified column:
        if (column.pageSize() > 0) {
          final ColumnVersionIterator<?> iterator =
              new ColumnVersionIterator<Object>(
                  row, column.family(), column.qualifier(), column.pageSize());
          field.set(entity, iterator);
        } else {
          Object value = null;
          if (field.getType() == KijiCellValueIterator.class) {
            value =
                new KijiCellValueIterator<Object>(
                    row.iterator(column.family(), column.qualifier()));
          } else if (field.getType() == TimeSeries.class) {
            final TimeSeries<Object> timeseries = new TimeSeries<Object>();
            for (final KijiCell<Object> cell :
                row.asIterable(column.family(), column.qualifier())) {
              timeseries.put(cell.getTimestamp(), cell.getData());
            }
            value = timeseries;
          }
          field.set(entity, value);
        }
      }
    }
Example #3
0
    /**
     * Populates a KijiDataRequest from this entity specification.
     *
     * @param builder Builder for the KijiDataRequest to populate.
     */
    public void populateColumnRequests(KijiDataRequestBuilder builder) {
      for (final Field field : mColumnFields) {
        final KijiColumn column = field.getAnnotation(KijiColumn.class);
        Preconditions.checkState(column != null);

        final ColumnsDef def =
            ColumnsDef.create()
                .withMaxVersions(column.maxVersions())
                .withPageSize(column.pageSize());
        if (column.qualifier().isEmpty()) {
          def.addFamily(column.family());
        } else {
          def.add(column.family(), column.qualifier());
        }
        builder.addColumns(def);
      }
    }