public Tuple exec()

in src/main/java/org/apache/datasketches/pig/quantiles/DataToItemsSketch.java [313:356]
36 lines of code
13 McCabe index (conditional complexity)

    public Tuple exec(final Tuple inputTuple) throws IOException { //throws is in API
      if ((inputTuple != null) && (inputTuple.size() > 0)) {
        final ItemsUnion<T> union = this.k_ > 0
            ? ItemsUnion.getInstance(this.k_, this.comparator_)
            : ItemsUnion.getInstance(this.comparator_);
        final DataBag outerBag = (DataBag) inputTuple.get(0);
        for (final Tuple dataTuple: outerBag) {
          final Object f0 = dataTuple.get(0);
          if (f0 == null) { continue; }
          if (f0 instanceof DataBag) {
            final DataBag innerBag = (DataBag) f0; // inputTuple.bag0.dataTupleN.f0:bag
            if (innerBag.size() == 0) { continue; }
            // If field 0 of a dataTuple is a Bag all innerTuples of this inner bag
            // will be passed into the union.
            // It is due to system bagged outputs from multiple mapper Initial functions.
            // The Intermediate stage was bypassed.
            for (final Tuple innerTuple: innerBag) {
              final Object value = innerTuple.get(0);
              if (value != null) {
                union.update(extractValue(value));
              }
            }
          } else if (f0 instanceof DataByteArray) { // inputTuple.bag0.dataTupleN.f0:DBA
            // If field 0 of a dataTuple is a DataByteArray we assume it is a sketch
            // due to system bagged outputs from multiple mapper Intermediate functions.
            // Each dataTuple.DBA:sketch will merged into the union.
            final DataByteArray dba = (DataByteArray) f0;
            union.update(ItemsSketch.getInstance(Memory.wrap(dba.get()), this.comparator_, this.serDe_));
          } else {
            throw new IllegalArgumentException("dataTuple.Field0: Is not a DataByteArray: "
                + f0.getClass().getName());
          }
        }
        final ItemsSketch<T> resultSketch = union.getResultAndReset();
        if (resultSketch != null) {
          return tupleFactory_.newTuple(new DataByteArray(resultSketch.toByteArray(this.serDe_)));
        }
      }
      // return empty sketch
      final ItemsSketch<T> sketch = this.k_ > 0
          ? ItemsSketch.getInstance(this.k_, this.comparator_)
          : ItemsSketch.getInstance(this.comparator_);
      return tupleFactory_.newTuple(new DataByteArray(sketch.toByteArray(this.serDe_)));
    }