void _main()

in HSQL/src/org/hsqldb1/util/Transfer.java [365:505]
109 lines of code
23 McCabe index (conditional complexity)

    void _main(String[] arg) {

        /*
         ** What function is asked from the transfer tool?
         */
        iTransferMode = TRFM_TRANSFER;

        if (arg != null) {
            if (arg.length != 1) {
                throw new IllegalArgumentException();
            }
            if ((arg[0].toLowerCase().equals("-r"))
                    || (arg[0].toLowerCase().equals("--restore"))) {
                iTransferMode = TRFM_RESTORE; } else if ((arg[0].toLowerCase().equals("-d"))
                       || (arg[0].toLowerCase().equals("--dump"))) {
                iTransferMode = TRFM_DUMP;
            } else if ((arg[0].toLowerCase().equals("-h"))
                       || (arg[0].toLowerCase().equals("--help"))) {
                System.out.println(Transfer.SYNTAX_MSG);
                return;
            } else {
                throw new IllegalArgumentException();
            }
        }

        fMain = new Frame("HSQL Transfer Tool");
        imgEmpty = createImage(new MemoryImageSource(2, 2, new int[4 * 4], 2,
                2));

        fMain.setIconImage(imgEmpty);
        fMain.addWindowListener(this);
        fMain.setSize(640, 480);
        fMain.add("Center", this);

        MenuBar  bar    = new MenuBar();
        String[] extras = {
            "Insert 10 rows only", "Insert 1000 rows only", "Insert all rows",
            "-", "Load Settings...", "Save Settings...", "-", "Exit"
        };
        Menu menu = new Menu("Options");

        addMenuItems(menu, extras);
        bar.add(menu);
        fMain.setMenuBar(bar);
        initGUI();

        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.setVisible(true);

        CurrentTransfer = CurrentAlter = 0;

        try {
            if ((iTransferMode == TRFM_DUMP)
                    || (iTransferMode == TRFM_TRANSFER)) {
                sourceDb = new TransferDb(
                    ConnectionDialog.createConnection(
                        fMain, "Source Database"), this);

                if (!sourceDb.isConnected()) {
                    exit();

                    return;
                }
            } else {
                FileDialog f = new FileDialog(fMain, "Restore FileName",
                                              FileDialog.LOAD);

                f.show();

                String sFileName = f.getFile();
                String Path      = f.getDirectory();

                if ((sFileName == null) || (sFileName.equals(""))) {
                    exit();

                    return;
                } else {
                    sourceDb = new TransferSQLText(Path + sFileName, this);
                }
            }

            if ((iTransferMode == TRFM_RESTORE)
                    || (iTransferMode == TRFM_TRANSFER)) {
                targetDb = new TransferDb(
                    ConnectionDialog.createConnection(
                        fMain, "Target Database"), this);

                if (!targetDb.isConnected()) {
                    exit();

                    return;
                }
            } else {
                FileDialog f = new FileDialog(fMain, "Dump FileName",
                                              FileDialog.SAVE);

                f.show();

                String sFileName = f.getFile();
                String Path      = f.getDirectory();

                if ((sFileName == null) || (sFileName.equals(""))) {
                    exit();

                    return;
                } else {
                    targetDb = new TransferSQLText(Path + sFileName, this);
                }
            }
        } catch (Exception e) {
            exit();
            e.printStackTrace();

            return;
        }

        if ((iTransferMode == TRFM_DUMP)
                || (iTransferMode == TRFM_TRANSFER)) {
            iSelectionStep = SELECT_SOURCE_CATALOG;
            sSourceCatalog = null;
        } else {
            iSelectionStep = SELECT_DEST_CATALOG;
            sDestCatalog   = null;
        }

        ProcessNextStep();
        fMain.show();

        return;
    }