private int[] getWidths(TableModel tableModel) {
   int[] widths = new int[tableModel.getColumnCount()];
   for (int r = 0;
       r < Math.min(tableModel.getRowCount(), 500);
       r++) { // 500 is not for performance, but for using only a sample of data with huge table
     for (int c = 0; c < tableModel.getColumnCount(); c++) {
       Object o = tableModel.getValueAt(r, c);
       if (o instanceof String) {
         String s = ((String) o).trim();
         if (s.length() > widths[c]) widths[c] = s.length();
       }
     }
   }
   return widths;
 }
  public void calculaSumas() {
    try {
      TableModel tm = this.tablaPrincipal.getModel();
      int tamTabla = tm.getRowCount();
      double costo, cantidad, totalFila, sumaTotal;
      sumaTotal = 0.0;

      for (int i = 0; i < tamTabla; i++) {
        if (tm.getValueAt(i, 2) != null && tm.getValueAt(i, 3) != null) {
          costo = Double.valueOf(String.valueOf(tm.getValueAt(i, 2)));
          cantidad = Double.valueOf(String.valueOf(tm.getValueAt(i, 3)));
          totalFila = costo * cantidad;

          tm.setValueAt(totalFila, i, 4);
          sumaTotal += totalFila;
        }
      }

      txtSumaTotal.setText(String.valueOf(sumaTotal));
    } catch (Exception e) {
      Dialogos.lanzarAlerta("Cantidades invalidas, puede que algun numero este mal escrito");
    }
  }
 public int getRowCount() {
   return original.getRowCount();
 }
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    try {
      Locales.setCurrent(request);
      if (Users.getCurrent() == null) { // for a bug in websphere portal 5.1 with Domino LDAP
        Users.setCurrent((String) request.getSession().getAttribute("xava.user"));
      }
      request.getParameter("application"); // for a bug in websphere 5.1
      request.getParameter("module"); // for a bug in websphere 5.1
      Tab tab = (Tab) request.getSession().getAttribute("xava_reportTab");
      int[] selectedRowsNumber =
          (int[]) request.getSession().getAttribute("xava_selectedRowsReportTab");
      Map[] selectedKeys = (Map[]) request.getSession().getAttribute("xava_selectedKeysReportTab");
      int[] selectedRows = getSelectedRows(selectedRowsNumber, selectedKeys, tab);
      request.getSession().removeAttribute("xava_selectedRowsReportTab");
      Integer columnCountLimit =
          (Integer) request.getSession().getAttribute("xava_columnCountLimitReportTab");
      request.getSession().removeAttribute("xava_columnCountLimitReportTab");

      setDefaultSchema(request);
      String user = (String) request.getSession().getAttribute("xava_user");
      request.getSession().removeAttribute("xava_user");
      Users.setCurrent(user);
      String uri = request.getRequestURI();
      if (uri.endsWith(".pdf")) {
        InputStream is;
        JRDataSource ds;
        Map parameters = new HashMap();
        synchronized (tab) {
          tab.setRequest(request);
          parameters.put("Title", tab.getTitle());
          parameters.put("Organization", getOrganization());
          parameters.put("Date", getCurrentDate());
          for (String totalProperty : tab.getTotalPropertiesNames()) {
            parameters.put(totalProperty + "__TOTAL__", getTotal(request, tab, totalProperty));
          }
          TableModel tableModel = getTableModel(request, tab, selectedRows, false, true, null);
          tableModel.getValueAt(0, 0);
          if (tableModel.getRowCount() == 0) {
            generateNoRowsPage(response);
            return;
          }
          is = getReport(request, response, tab, tableModel, columnCountLimit);
          ds = new JRTableModelDataSource(tableModel);
        }
        JasperPrint jprint = JasperFillManager.fillReport(is, parameters, ds);
        response.setContentType("application/pdf");
        response.setHeader(
            "Content-Disposition", "inline; filename=\"" + getFileName(tab) + ".pdf\"");
        JasperExportManager.exportReportToPdfStream(jprint, response.getOutputStream());
      } else if (uri.endsWith(".csv")) {
        String csvEncoding = XavaPreferences.getInstance().getCSVEncoding();
        if (!Is.emptyString(csvEncoding)) {
          response.setCharacterEncoding(csvEncoding);
        }
        response.setContentType("text/x-csv");
        response.setHeader(
            "Content-Disposition", "inline; filename=\"" + getFileName(tab) + ".csv\"");
        synchronized (tab) {
          tab.setRequest(request);
          response
              .getWriter()
              .print(
                  TableModels.toCSV(
                      getTableModel(request, tab, selectedRows, true, false, columnCountLimit)));
        }
      } else {
        throw new ServletException(
            XavaResources.getString("report_type_not_supported", "", ".pdf .csv"));
      }
    } catch (Exception ex) {
      log.error(ex.getMessage(), ex);
      throw new ServletException(XavaResources.getString("report_error"));
    } finally {
      request.getSession().removeAttribute("xava_reportTab");
    }
  }