validateInputStream(in);
        try (final HSSFWorkbook workbook = new HSSFWorkbook(in);
                final org.apache.poi.hssf.extractor.ExcelExtractor excelExtractor =
                        new org.apache.poi.hssf.extractor.ExcelExtractor(workbook)) {
            return new ExtractData(excelExtractor.getText());
        } catch (final IOException e) {

  <mime-type type="application/prs.plucker"/>
  <mime-type type="application/qsig"/>

  <mime-type type="application/vnd.ms-spreadsheetml">
    <root-XML localName="Workbook" namespaceURI="urn:schemas-microsoft-com:office:spreadsheet"/>
    <root-XML localName="Workbook"/>
    <sub-class-of type="application/xml"/>
    <_comment>Excel 2003 xml format, pre-ooxml</_comment>
    <_comment>glob pattern typically *.xls</_comment>
  </mime-type>

  TF_Graph* graph_;
  int counter_;
};

// Helper macros for the TF_OperationGetAttr* tests.
// TODO(ashankar): Use gmock matchers instead?
// (https://github.com/google/googletest/blob/master/googlemock/docs/CookBook.md#writing-new-parameterized-matchers-quickly)
// That will require setting up the tensorflow build with gmock.
#define EXPECT_TF_META(attr_name, expected_list_size, expected_type, \