private static RasterDataNode[] getReferencedNodes(final RasterDataNode node) {
    final Product product = node.getProduct();
    if (product != null) {
      final List<String> expressions = new ArrayList<String>(10);
      if (node.getValidPixelExpression() != null) {
        expressions.add(node.getValidPixelExpression());
      }
      final ProductNodeGroup<Mask> overlayMaskGroup = node.getOverlayMaskGroup();
      if (overlayMaskGroup.getNodeCount() > 0) {
        final Mask[] overlayMasks =
            overlayMaskGroup.toArray(new Mask[overlayMaskGroup.getNodeCount()]);
        for (final Mask overlayMask : overlayMasks) {
          final String expression;
          if (overlayMask.getImageType() == Mask.BandMathsType.INSTANCE) {
            expression = Mask.BandMathsType.getExpression(overlayMask);
          } else if (overlayMask.getImageType() == Mask.RangeType.INSTANCE) {
            expression = Mask.RangeType.getExpression(overlayMask);
          } else {
            expression = null;
          }
          if (expression != null) {
            expressions.add(expression);
          }
        }
      }
      if (node instanceof VirtualBand) {
        final VirtualBand virtualBand = (VirtualBand) node;
        expressions.add(virtualBand.getExpression());
      }

      final ArrayList<Term> termList = new ArrayList<Term>(10);
      for (final String expression : expressions) {
        try {
          final Term term = product.parseExpression(expression);
          if (term != null) {
            termList.add(term);
          }
        } catch (ParseException e) {
          // @todo se handle parse exception
          Debug.trace(e);
        }
      }

      final Term[] terms = termList.toArray(new Term[termList.size()]);
      final RasterDataSymbol[] refRasterDataSymbols = BandArithmetic.getRefRasterDataSymbols(terms);
      return BandArithmetic.getRefRasters(refRasterDataSymbols);
    }
    return new RasterDataNode[0];
  }
  protected void addBandsToProduct(Product product) {
    Debug.assertNotNull(getSourceProduct());
    Debug.assertNotNull(product);
    for (int i = 0; i < getSourceProduct().getNumBands(); i++) {
      Band sourceBand = getSourceProduct().getBandAt(i);
      String bandName = sourceBand.getName();
      if (isNodeAccepted(bandName)) {
        Band destBand;
        boolean treatVirtualBandsAsRealBands = false;
        if (getSubsetDef() != null && getSubsetDef().getTreatVirtualBandsAsRealBands()) {
          treatVirtualBandsAsRealBands = true;
        }

        // @todo 1 se/se - extract copy of a band or virtual band to create deep clone of band and
        // virtual band
        if (!treatVirtualBandsAsRealBands && sourceBand instanceof VirtualBand) {
          VirtualBand virtualSource = (VirtualBand) sourceBand;
          destBand =
              new VirtualBand(
                  bandName,
                  sourceBand.getDataType(),
                  getSceneRasterWidth(),
                  getSceneRasterHeight(),
                  virtualSource.getExpression());
        } else {
          destBand =
              new Band(
                  bandName,
                  sourceBand.getDataType(),
                  getSceneRasterWidth(),
                  getSceneRasterHeight());
        }
        if (sourceBand.getUnit() != null) {
          destBand.setUnit(sourceBand.getUnit());
        }
        if (sourceBand.getDescription() != null) {
          destBand.setDescription(sourceBand.getDescription());
        }
        destBand.setScalingFactor(sourceBand.getScalingFactor());
        destBand.setScalingOffset(sourceBand.getScalingOffset());
        destBand.setLog10Scaled(sourceBand.isLog10Scaled());
        destBand.setSpectralBandIndex(sourceBand.getSpectralBandIndex());
        destBand.setSpectralWavelength(sourceBand.getSpectralWavelength());
        destBand.setSpectralBandwidth(sourceBand.getSpectralBandwidth());
        destBand.setSolarFlux(sourceBand.getSolarFlux());
        if (sourceBand.isNoDataValueSet()) {
          destBand.setNoDataValue(sourceBand.getNoDataValue());
        }
        destBand.setNoDataValueUsed(sourceBand.isNoDataValueUsed());
        destBand.setValidPixelExpression(sourceBand.getValidPixelExpression());
        FlagCoding sourceFlagCoding = sourceBand.getFlagCoding();
        IndexCoding sourceIndexCoding = sourceBand.getIndexCoding();
        if (sourceFlagCoding != null) {
          String flagCodingName = sourceFlagCoding.getName();
          FlagCoding destFlagCoding = product.getFlagCodingGroup().get(flagCodingName);
          Debug.assertNotNull(
              destFlagCoding); // should not happen because flag codings should be already in
                               // product
          destBand.setSampleCoding(destFlagCoding);
        } else if (sourceIndexCoding != null) {
          String indexCodingName = sourceIndexCoding.getName();
          IndexCoding destIndexCoding = product.getIndexCodingGroup().get(indexCodingName);
          Debug.assertNotNull(
              destIndexCoding); // should not happen because index codings should be already in
                                // product
          destBand.setSampleCoding(destIndexCoding);
        } else {
          destBand.setSampleCoding(null);
        }
        if (isFullScene(getSubsetDef()) && sourceBand.isStxSet()) {
          copyStx(sourceBand, destBand);
        }
        product.addBand(destBand);
        bandMap.put(destBand, sourceBand);
      }
    }
    for (final Map.Entry<Band, RasterDataNode> entry : bandMap.entrySet()) {
      copyImageInfo(entry.getValue(), entry.getKey());
    }
  }