public Iterator getStreamKeys(){        // We do nothing.        return null;    }     /**     * System parameters.     */    static Hashtable systemParam = new Hashtable();     static {        systemParam.put("codebase", "codebase");        systemParam.put("code", "code");        systemParam.put("alt", "alt");        systemParam.put("width", "width");        systemParam.put("height", "height");        systemParam.put("align", "align");        systemParam.put("vspace", "vspace");        systemParam.put("hspace", "hspace");    }     /**     * Print the HTML tag.     */    public static void printTag(PrintStream out, Hashtable atts) {        out.print("<applet");         String v = (String)atts.get("codebase");        if (v != null) {            out.print(" codebase=\"" + v + "\"");        }         v = (String)atts.get("code");        if (v == null) {            v = "applet.class";        }        out.print(" code=\"" + v + "\"");        v = (String)atts.get("width");        if (v == null) {            v = "150";        }        out.print(" width=" + v);         v = (String)atts.get("height");        if (v == null) {            v = "100";        }        out.print(" height=" + v);         v = (String)atts.get("name");        if (v != null) {            out.print(" name=\"" + v + "\"");        }        out.println(">");         // A very slow sorting algorithm        int len = atts.size();        String params[] = new String[len];        len = 0;        for (Enumeration e = atts.keys() ; e.hasMoreElements() ;) {            String param = (String)e.nextElement();            int i = 0;            for (; i < len ; i++) {                if (params[i].compareTo(param) >= 0) {                    break;                }            }            System.arraycopy(params, i, params, i + 1, len - i);            params[i] = param;            len++;        }         for (int i = 0 ; i < len ; i++) {            String param = params[i];            if (systemParam.get(param) == null) {                out.println("<param name=" + param +                            " value=\"" + atts.get(param) + "\">");            }        }        out.println("</applet>");    }     /**     * Make sure the atrributes are uptodate.     */    public void updateAtts() {        Dimension d = panel.size();        Insets in = panel.insets();        panel.atts.put("width",                       Integer.toString(d.width - (in.left + in.right)));        panel.atts.put("height",                       Integer.toString(d.height - (in.top + in.bottom)));    }     /**     * Restart the applet.     */    void appletRestart() {        panel.sendEvent(AppletPanel.APPLET_STOP);        panel.sendEvent(AppletPanel.APPLET_DESTROY);        panel.sendEvent(AppletPanel.APPLET_INIT);        panel.sendEvent(AppletPanel.APPLET_START);    }     /**     * Reload the applet.     */    void appletReload() {        panel.sendEvent(AppletPanel.APPLET_STOP);        panel.sendEvent(AppletPanel.APPLET_DESTROY);        panel.sendEvent(AppletPanel.APPLET_DISPOSE);         /**         * Fixed #4501142: Classlaoder sharing policy doesn't         * take "archive" into account. This will be overridden         * by Java Plug-in.                     [stanleyh]         */        AppletPanel.flushClassLoader(panel.getClassLoaderCacheKey());         /*         * Make sure we don't have two threads running through the event queue         * at the same time.         */        try {            panel.joinAppletThread();            panel.release();        } catch (InterruptedException e) {            return;   // abort the reload        }         panel.createAppletThread();        panel.sendEvent(AppletPanel.APPLET_LOAD);        panel.sendEvent(AppletPanel.APPLET_INIT);        panel.sendEvent(AppletPanel.APPLET_START);    }     /**     * Save the applet to a well known file (for now) as a serialized object     */    void appletSave() {        AccessController.doPrivileged(new PrivilegedAction() {             public Object run() {                // XXX: this privileged block should be made smaller                // by initializing a private static variable with "user.dir"                 // Applet needs to be stopped for serialization to succeed.                // Since panel.sendEvent only queues the event, there is a                // chance that the event will not be processed before                // serialization begins.  However, by sending the event before                // FileDialog is created, enough time is given such that this                // situation is unlikely to ever occur.                 panel.sendEvent(AppletPanel.APPLET_STOP);                FileDialog fd = new FileDialog(AppletViewer.this,                                               amh.getMessage("appletsave.filedialogtitle"),                                               FileDialog.SAVE);                // needed for a bug under Solaris...                fd.setDirectory(System.getProperty("user.dir"));                fd.setFile(defaultSaveFile);                fd.show();                String fname = fd.getFile();                if (fname == null) {                    // Restart applet if Save is cancelled.                    panel.sendEvent(AppletPanel.APPLET_START);                    return null;                // cancelled                }                String dname = fd.getDirectory();                File file = new File(dname, fname);                 try {                    BufferedOutputStream s = new BufferedOutputStream(new FileOutputStream(file));                    ObjectOutputStream os = new ObjectOutputStream(s);                    showStatus(amh.getMessage("appletsave.err1",                                              panel.applet.toString(), file.toString()));                    os.writeObject(panel.applet);                } catch (IOException ex) {                    System.err.println(amh.getMessage("appletsave.err2", ex));                } finally {                    panel.sendEvent(AppletPanel.APPLET_START);                }                return null;            }        });    }     /**     * Clone the viewer and the applet.     */    void appletClone() {        Point p = location();        updateAtts();        factory.createAppletViewer(p.x + XDELTA, p.y + YDELTA,                                   panel.documentURL, (Hashtable)panel.atts.clone());    }     /**     * Show the applet tag.     */    void appletTag() {        ByteArrayOutputStream out = new ByteArrayOutputStream();        updateAtts();        printTag(new PrintStream(out), panel.atts);        showStatus(amh.getMessage("applettag"));         Point p = location();        new TextFrame(p.x + XDELTA, p.y + YDELTA, amh.getMessage("applettag.textframe"), out.toString());    }     /**     * Show the applet info.     */    void appletInfo() {        String str = panel.applet.getAppletInfo();        if (str == null) {            str = amh.getMessage("appletinfo.applet");        }        str += "\n\n";         String atts[][] = panel.applet.getParameterInfo();        if (atts != null) {            for (int i = 0 ; i < atts.length ; i++) {                str += atts[i][0] + " -- " + atts[i][1] + " -- " + atts[i][2] + "\n";            }        } else {            str += amh.getMessage("appletinfo.param");        }         Point p = location();        new TextFrame(p.x + XDELTA, p.y + YDELTA, amh.getMessage("appletinfo.textframe"), str);     }     /**     * Show character encoding type     */    void appletCharacterEncoding() {        showStatus(amh.getMessage("appletencoding", encoding));    }     /**     * Edit the applet.     */    void appletEdit() {    }     /**     * Print the applet.     */    void appletPrint() {        PrinterJob pj = PrinterJob.getPrinterJob();         if (pj != null) {            PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();            if (pj.printDialog(aset)) {                pj.setPrintable(this);                try {                    pj.print(aset);                    statusMsgStream.println(amh.getMessage("appletprint.finish"));                } catch (PrinterException e) {                   statusMsgStream.println(amh.getMessage("appletprint.fail"));                }            } else {                statusMsgStream.println(amh.getMessage("appletprint.cancel"));            }        } else {            statusMsgStream.println(amh.getMessage("appletprint.fail"));        }    }     public int print(Graphics graphics, PageFormat pf, int pageIndex) {        if (pageIndex > 0) {            return Printable.NO_SUCH_PAGE;        } else {            Graphics2D g2d = (Graphics2D)graphics;            g2d.translate(pf.getImageableX(), pf.getImageableY());            panel.applet.printAll(graphics);            return Printable.PAGE_EXISTS;        }    }     /**     * Properties.     */    static AppletProps props;    public static synchronized void networkProperties() {        if (props == null) {            props = new AppletProps();        }        props.addNotify();        props.setVisible(true);    }     /**     * Start the applet.     */    void appletStart() {        panel.sendEvent(AppletPanel.APPLET_START);    }     /**     * Stop the applet.     */    void appletStop() {        panel.sendEvent(AppletPanel.APPLET_STOP);    }     /**     * Shutdown a viewer.     * Stop, Destroy, Dispose and Quit a viewer     */    private void appletShutdown(AppletPanel p) {        p.sendEvent(AppletPanel.APPLET_STOP);        p.sendEvent(AppletPanel.APPLET_DESTROY);        p.sendEvent(AppletPanel.APPLET_DISPOSE);        p.sendEvent(AppletPanel.APPLET_QUIT);    }     /**     * Close this viewer.     * Stop, Destroy, Dispose and Quit an AppletView, then     * reclaim resources and exit the program if this is     * the last applet.     */    void appletClose() {         // The caller thread is event dispatch thread, so        // spawn a new thread to avoid blocking the event queue        // when calling appletShutdown.        //        final AppletPanel p = panel;         new Thread(new Runnable()        {            public void run()            {                appletShutdown(p);                appletPanels.removeElement(p);                dispose();                 if (countApplets() == 0) {                    appletSystemExit();                }            }        }).start();    }     /**     * Exit the program.     * Exit from the program (if not stand alone) - do no clean-up     */    private void appletSystemExit() {        if (factory.isStandalone())            System.exit(0);    }     /**     * Quit all viewers.     * Shutdown all viewers properly then     * exit from the program (if not stand alone)     */    protected void appletQuit()    {        // The caller thread is event dispatch thread, so        // spawn a new thread to avoid blocking the event queue        // when calling appletShutdown.        //        new Thread(new Runnable()        {            public void run()            {                for (Enumeration e = appletPanels.elements() ; e.hasMoreElements() ;) {                    AppletPanel p = (AppletPanel)e.nextElement();                    appletShutdown(p);                }                appletSystemExit();            }        }).start();    }     /**     * Handle events.     */    public void processUserAction(ActionEvent evt) {         String label = ((MenuItem)evt.getSource()).getLabel();         if (amh.getMessage("menuitem.restart").equals(label)) {            appletRestart();            return;        }         if (amh.getMessage("menuitem.reload").equals(label)) {            appletReload();            return;        }         if (amh.getMessage("menuitem.clone").equals(label)) {            appletClone();            return;        }         if (amh.getMessage("menuitem.stop").equals(label)) {            appletStop();            return;        }         if (amh.getMessage("menuitem.save").equals(label)) {            appletSave();            return;        }         if (amh.getMessage("menuitem.start").equals(label)) {            appletStart();            return;        }         if (amh.getMessage("menuitem.tag").equals(label)) {            appletTag();            return;        }         if (amh.getMessage("menuitem.info").equals(label)) {            appletInfo();            return;        }         if (amh.getMessage("menuitem.encoding").equals(label)) {            appletCharacterEncoding();            return;        }         if (amh.getMessage("menuitem.edit").equals(label)) {            appletEdit();            return;        }         if (amh.getMessage("menuitem.print").equals(label)) {            appletPrint();            return;        }         if (amh.getMessage("menuitem.props").equals(label)) {            networkProperties();            return;        }         if (amh.getMessage("menuitem.close").equals(label)) {            appletClose();            return;        }         if (factory.isStandalone() && amh.getMessage("menuitem.quit").equals(label)) {            appletQuit();            return;        }        //statusMsgStream.println("evt = " + evt);    }     /**     * How many applets are running?     */     public static int countApplets() {        return appletPanels.size();    }      /**     * The current character.     */    static int c;     /**     * Scan spaces.     */    public static void skipSpace(Reader in) throws IOException {        while ((c >= 0) &&               ((c == ' ') || (c == '\t') || (c == '\n') || (c == '\r'))) {            c = in.read();        }    }     /**     * Scan identifier     */    public static String scanIdentifier(Reader in) throws IOException {        StringBuffer buf = new StringBuffer();        while (true) {            if (((c >= 'a') && (c <= 'z')) ||                ((c >= 'A') && (c <= 'Z')) ||                ((c >= '0') && (c <= '9')) || (c == '_')) {                buf.append((char)c);                c = in.read();            } else {                return buf.toString();            }        }    } 

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