public void actionPerformed(ActionEvent ev) {

    String s = ev.getActionCommand();

    if (s == null) {
      if (ev.getSource() instanceof JMenuItem) {
        JMenuItem i;

        s = ((JMenuItem) ev.getSource()).getText();
      }
    }

    /*
    // button replace by toolbar
            if (s.equals("Execute")) {
                execute();
            } else
    */
    if (s.equals("Exit")) {
      windowClosing(null);
    } else if (s.equals("Transfer")) {
      Transfer.work(null);
    } else if (s.equals("Dump")) {
      Transfer.work(new String[] {"-d"});
    } else if (s.equals("Restore")) {
      Transfer.work(new String[] {"-r"});
    } else if (s.equals("Logging on")) {
      javaSystem.setLogToSystem(true);
    } else if (s.equals("Logging off")) {
      javaSystem.setLogToSystem(false);
    } else if (s.equals("Refresh Tree")) {
      refreshTree();
    } else if (s.startsWith("#")) {
      int i = Integer.parseInt(s.substring(1));

      txtCommand.setText(sRecent[i]);
    } else if (s.equals("Connect...")) {
      connect(ConnectionDialogSwing.createConnection(fMain, "Connect"));
      refreshTree();
    } else if (s.equals("Results in Grid")) {
      iResult = 0;

      pResult.removeAll();
      pResult.add(gScrollPane, BorderLayout.CENTER);
      pResult.doLayout();
      gResult.fireTableChanged(null);
      pResult.repaint();
    } else if (s.equals("Open Script...")) {
      JFileChooser f = new JFileChooser(".");

      f.setDialogTitle("Open Script...");

      // (ulrivo): set default directory if set from command line
      if (defDirectory != null) {
        f.setCurrentDirectory(new File(defDirectory));
      }

      int option = f.showOpenDialog(fMain);

      if (option == JFileChooser.APPROVE_OPTION) {
        File file = f.getSelectedFile();

        if (file != null) {
          StringBuffer buf = new StringBuffer();

          ifHuge = DatabaseManagerCommon.readFile(file.getAbsolutePath());

          if (4096 <= ifHuge.length()) {
            buf.append("This huge file cannot be edited. Please execute\n");
            txtCommand.setText(buf.toString());
          } else {
            txtCommand.setText(ifHuge);
          }
        }
      }
    } else if (s.equals("Save Script...")) {
      JFileChooser f = new JFileChooser(".");

      f.setDialogTitle("Save Script");

      // (ulrivo): set default directory if set from command line
      if (defDirectory != null) {
        f.setCurrentDirectory(new File(defDirectory));
      }

      int option = f.showSaveDialog(fMain);

      if (option == JFileChooser.APPROVE_OPTION) {
        File file = f.getSelectedFile();

        if (file != null) {
          DatabaseManagerCommon.writeFile(file.getAbsolutePath(), txtCommand.getText());
        }
      }
    } else if (s.equals("Save Result...")) {
      JFileChooser f = new JFileChooser(".");

      f.setDialogTitle("Save Result...");

      // (ulrivo): set default directory if set from command line
      if (defDirectory != null) {
        f.setCurrentDirectory(new File(defDirectory));
      }

      int option = f.showSaveDialog(fMain);

      if (option == JFileChooser.APPROVE_OPTION) {
        File file = f.getSelectedFile();

        if (file != null) {
          showResultInText();
          DatabaseManagerCommon.writeFile(file.getAbsolutePath(), txtResult.getText());
        }
      }
    } else if (s.equals("Results in Text")) {
      iResult = 1;

      pResult.removeAll();
      pResult.add(txtResultScroll, BorderLayout.CENTER);
      pResult.doLayout();
      showResultInText();
      pResult.repaint();
    } else if (s.equals("AutoCommit on")) {
      try {
        cConn.setAutoCommit(true);
      } catch (SQLException e) {
      }
    } else if (s.equals("AutoCommit off")) {
      try {
        cConn.setAutoCommit(false);
      } catch (SQLException e) {
      }
    } else if (s.equals("Commit")) {
      try {
        cConn.commit();
      } catch (SQLException e) {
      }
    } else if (s.equals("Insert test data")) {
      insertTestData();
    } else if (s.equals("Rollback")) {
      try {
        cConn.rollback();
      } catch (SQLException e) {
      }
    } else if (s.equals("Disable MaxRows")) {
      try {
        sStatement.setMaxRows(0);
      } catch (SQLException e) {
      }
    } else if (s.equals("Set MaxRows to 100")) {
      try {
        sStatement.setMaxRows(100);
      } catch (SQLException e) {
      }
    } else if (s.equals("SELECT")) {
      showHelp(DatabaseManagerCommon.selectHelp);
    } else if (s.equals("INSERT")) {
      showHelp(DatabaseManagerCommon.insertHelp);
    } else if (s.equals("UPDATE")) {
      showHelp(DatabaseManagerCommon.updateHelp);
    } else if (s.equals("DELETE")) {
      showHelp(DatabaseManagerCommon.deleteHelp);
    } else if (s.equals("CREATE TABLE")) {
      showHelp(DatabaseManagerCommon.createTableHelp);
    } else if (s.equals("DROP TABLE")) {
      showHelp(DatabaseManagerCommon.dropTableHelp);
    } else if (s.equals("CREATE INDEX")) {
      showHelp(DatabaseManagerCommon.createIndexHelp);
    } else if (s.equals("DROP INDEX")) {
      showHelp(DatabaseManagerCommon.dropIndexHelp);
    } else if (s.equals("CHECKPOINT")) {
      showHelp(DatabaseManagerCommon.checkpointHelp);
    } else if (s.equals("SCRIPT")) {
      showHelp(DatabaseManagerCommon.scriptHelp);
    } else if (s.equals("SHUTDOWN")) {
      showHelp(DatabaseManagerCommon.shutdownHelp);
    } else if (s.equals("SET")) {
      showHelp(DatabaseManagerCommon.setHelp);
    } else if (s.equals("Test Script")) {
      showHelp(DatabaseManagerCommon.testHelp);
    }
  }
  void main() {

    CommonSwing.setDefaultColor();

    fMain = new JFrame("HSQL Database Manager");

    // (ulrivo): An actual icon.
    fMain.getContentPane().add(createToolBar(), "North");
    fMain.setIconImage(CommonSwing.getIcon());
    fMain.addWindowListener(this);

    JMenuBar bar = new JMenuBar();

    // used shortcuts: CERGTSIUDOLM
    String fitems[] = {
      "-Connect...", "--", "-Open Script...", "-Save Script...", "-Save Result...", "--", "-Exit"
    };

    addMenu(bar, "File", fitems);

    String vitems[] = {"RRefresh Tree", "--", "GResults in Grid", "TResults in Text"};

    addMenu(bar, "View", vitems);

    String sitems[] = {
      "SSELECT",
      "IINSERT",
      "UUPDATE",
      "DDELETE",
      "---",
      "-CREATE TABLE",
      "-DROP TABLE",
      "-CREATE INDEX",
      "-DROP INDEX",
      "--",
      "-CHECKPOINT",
      "-SCRIPT",
      "-SET",
      "-SHUTDOWN",
      "--",
      "-Test Script"
    };

    addMenu(bar, "Command", sitems);

    mRecent = new JMenu("Recent");

    bar.add(mRecent);

    String soptions[] = {
      "-AutoCommit on",
      "-AutoCommit off",
      "OCommit",
      "LRollback",
      "--",
      "-Disable MaxRows",
      "-Set MaxRows to 100",
      "--",
      "-Logging on",
      "-Logging off",
      "--",
      "-Insert test data"
    };

    addMenu(bar, "Options", soptions);

    String stools[] = {"-Dump", "-Restore", "-Transfer"};

    addMenu(bar, "Tools", stools);
    fMain.setJMenuBar(bar);
    initGUI();

    sRecent = new String[iMaxRecent];

    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension size = fMain.getSize();

    // (ulrivo): full size on screen with less than 640 width
    if (d.width >= 640) {
      fMain.setLocation((d.width - size.width) / 2, (d.height - size.height) / 2);
    } else {
      fMain.setLocation(0, 0);
      fMain.setSize(d);
    }

    fMain.show();

    // (ulrivo): load query from command line
    if (defScript != null) {
      if (defDirectory != null) {
        defScript = defDirectory + File.separator + defScript;
      }

      // if insert stmet is thousands of records...skip showing it
      // as text.  Too huge.
      StringBuffer buf = new StringBuffer();

      ifHuge = DatabaseManagerCommon.readFile(defScript);

      if (4096 <= ifHuge.length()) {
        buf.append("This huge file cannot be edited. Please execute\n");
        txtCommand.setText(buf.toString());
      } else {
        txtCommand.setText(ifHuge);
      }
    }

    txtCommand.requestFocus();
  }