private boolean nextKeyValue4Excel97() throws IOException {
  if (!rowIterator.hasNext()) {
    return false;
  }

  currentRow++;

  Row row = rowIterator.next();
  
  if(ExcelUtils.isEmptyRow(row)) {
    //skip empty rows
    return next();
  }

  //if not fill the schema before as no header or invalid header, set it here and as no valid name as no header, so set a name like this : field1,field2,field3
  if(schema == null) {
    schema = createSchema(row, false);
  }
  value = new GenericData.Record(schema);
  
  List<Field> fields = schema.getFields();
  
  int lastColumn = Math.max(row.getLastCellNum(), fields.size());
  
  for (int i = 0; i < lastColumn; i++) {
    String content = ExcelUtils.getCellValueAsString(row.getCell(i, MissingCellPolicy.RETURN_BLANK_AS_NULL), formulaEvaluator);
    value.put(i, content);
  }

  return true;
}
 

/**
 * 条件に一致するセルを探す
 * @return 見つからない場合は、nullを返す。
 */
private Cell findCell() {
    
    final int rowStart = startRow < 0 ? 0 : startRow;
    final int columnStart = startColumn < 0 ? 0 : startColumn;
    
    final int maxRow = POIUtils.getRows(sheet);
    for(int i=rowStart; i < maxRow; i++) {
        final Row row = sheet.getRow(i);
        if(row == null) {
            continue;
        }
        
        final int maxCol = row.getLastCellNum();;
        for(int j=columnStart; j < maxCol; j++) {
            
            if(excludeStartPoisition && includeInStartPosition(j, i)) {
                // 開始位置を除外する場合
                continue;
            }
            
            final Cell cell = row.getCell(j, MissingCellPolicy.CREATE_NULL_AS_BLANK);
            final String cellValue = POIUtils.getCellContents(cell, config.getCellFormatter());
            if(Utils.matches(cellValue, label, config)) {
                return cell;
            }
        }
    }
    
    return null;
    
}
 

/**
 * Not supported
 */
@Override
public MissingCellPolicy getMissingCellPolicy() {
    throw new UnsupportedOperationException();
}
 

/**
 * Not supported
 */
@Override
public void setMissingCellPolicy(MissingCellPolicy missingCellPolicy) {
    throw new UnsupportedOperationException();
}
 

/**
 * Not supported
 */
@Override
public MissingCellPolicy getMissingCellPolicy() {
    throw new UnsupportedOperationException();
}
 

/**
 * Not supported
 */
@Override
public void setMissingCellPolicy(MissingCellPolicy missingCellPolicy) {
    throw new UnsupportedOperationException();
}
 

/**
 * Not supported
 */
@Override
public MissingCellPolicy getMissingCellPolicy() {
  throw new UnsupportedOperationException();
}
 

/**
 * Not supported
 */
@Override
public void setMissingCellPolicy(MissingCellPolicy missingCellPolicy) {
  throw new UnsupportedOperationException();
}
 

/**
 * Retrieves the current policy on what to do when
 *  getting missing or blank cells from a row.
    * <p>
 * The default is to return blank and null cells.
 *  {@link MissingCellPolicy}
    * </p>
 */
MissingCellPolicy getMissingCellPolicy();
 

/**
 * Sets the policy on what to do when
 *  getting missing or blank cells from a row.
    *
 * This will then apply to all calls to
 *  {@link Row#getCell(int)} }. See
 *  {@link MissingCellPolicy}
 */
void setMissingCellPolicy(MissingCellPolicy missingCellPolicy);
 

/**
 * Retrieves the current policy on what to do when
 *  getting missing or blank cells from a row.
 * The default is to return blank and null cells.
 *  {@link MissingCellPolicy}
 */
@Override
public MissingCellPolicy getMissingCellPolicy() {
    return missingCellPolicy;
}
 

/**
 * Sets the policy on what to do when
 *  getting missing or blank cells from a row.
 * This will then apply to all calls to
 *  {@link HSSFRow#getCell(int)}}. See
 *  {@link MissingCellPolicy}.
 * Note that this has no effect on any
 *  iterators, only on when fetching Cells
 *  by their column index.
 */
@Override
public void setMissingCellPolicy(MissingCellPolicy missingCellPolicy) {
    this.missingCellPolicy = missingCellPolicy;
}