示例#1
1
  /**
   * Loads the drawing. By convention this method is invoked on a worker thread.
   *
   * @param progress A ProgressIndicator to inform the user about the progress of the operation.
   * @return The Drawing that was loaded.
   */
  protected Drawing loadDrawing(ProgressIndicator progress) throws IOException {
    Drawing drawing = createDrawing();
    if (getParameter("datafile") != null) {
      URL url = new URL(getDocumentBase(), getParameter("datafile"));
      URLConnection uc = url.openConnection();

      // Disable caching. This ensures that we always request the
      // newest version of the drawing from the server.
      // (Note: The server still needs to set the proper HTTP caching
      // properties to prevent proxies from caching the drawing).
      if (uc instanceof HttpURLConnection) {
        ((HttpURLConnection) uc).setUseCaches(false);
      }

      // Read the data into a buffer
      int contentLength = uc.getContentLength();
      InputStream in = uc.getInputStream();
      try {
        if (contentLength != -1) {
          in = new BoundedRangeInputStream(in);
          ((BoundedRangeInputStream) in).setMaximum(contentLength + 1);
          progress.setProgressModel((BoundedRangeModel) in);
          progress.setIndeterminate(false);
        }
        BufferedInputStream bin = new BufferedInputStream(in);
        bin.mark(512);

        // Read the data using all supported input formats
        // until we succeed
        IOException formatException = null;
        for (InputFormat format : drawing.getInputFormats()) {
          try {
            bin.reset();
          } catch (IOException e) {
            uc = url.openConnection();
            in = uc.getInputStream();
            in = new BoundedRangeInputStream(in);
            ((BoundedRangeInputStream) in).setMaximum(contentLength + 1);
            progress.setProgressModel((BoundedRangeModel) in);
            bin = new BufferedInputStream(in);
            bin.mark(512);
          }
          try {
            bin.reset();
            format.read(bin, drawing, true);
            formatException = null;
            break;
          } catch (IOException e) {
            formatException = e;
          }
        }
        if (formatException != null) {
          throw formatException;
        }
      } finally {
        in.close();
      }
    }
    return drawing;
  }
示例#2
0
  /**
   * Displays a progress indicator and then invokes <code>loadDrawing</code> on a worker thread.
   * Displays the drawing panel when done successfully. Displays an error message when done
   * unsuccessfully.
   *
   * @see #loadDrawing
   */
  @Override
  public final void init() {
    // set the language of the applet
    if (getParameter("Locale") != null) {
      Locale.setDefault(new Locale(getParameter("Locale")));
    }

    final ResourceBundleUtil labels =
        ResourceBundleUtil.getBundle("org.jhotdraw.samples.svg.Labels");

    // Set look and feel
    // -----------------
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    } catch (Throwable e) {
      // Do nothing.
      // If we can't set the desired look and feel, UIManager does
      // automaticaly the right thing for us.
    }

    // Set our own popup factory, because the one that comes with Mac OS X
    // creates translucent popups which is not useful for color selection
    // using pop menus.
    try {
      PopupFactory.setSharedInstance(new PopupFactory());
    } catch (Throwable e) {
      // If we can't set the popup factory, we have to use what is there.
    }

    // Display a progress indicator while we are loading the drawing
    // ----------------------------------------------------------
    Container c = getContentPane();
    final ProgressIndicator progress =
        new ProgressIndicator(getName(), labels.getString("progressInitializing"));
    c.add(progress);
    progress.revalidate();

    // Load the drawing using a worker thread
    // --------------------------------------
    new Worker<Drawing>() {

      @Override
      protected Drawing construct() throws Exception {
        Thread t =
            new Thread() {

              @Override
              public void run() {
                try {
                  drawingComponent = createDrawingComponent();
                } catch (Throwable t) {
                  t.printStackTrace();
                }
              }
            };
        t.start();
        try {
          progress.setNote(labels.getString("progressLoading"));
          Drawing drawing = loadDrawing(progress);
          progress.setNote(labels.getString("progressOpeningEditor"));
          progress.setIndeterminate(true);
          return drawing;
        } finally {
          t.join();
        }
      }

      @Override
      protected void done(Drawing result) {
        Container c = getContentPane();
        c.removeAll();
        c.setLayout(new BorderLayout());
        c.add(drawingComponent.getComponent());
        initComponents();
        if (result != null) {
          setDrawing(result);
        }
        drawingComponent.revalidate();
        ((JComponent) c).revalidate();
      }

      @Override
      protected void failed(Throwable error) {
        Drawing d = createDrawing();
        String message = (error.getMessage() == null) ? error.toString() : error.getMessage();
        SVGTextAreaFigure txt =
            new SVGTextAreaFigure(
                labels.getFormatted("messageLoadFailed", getParameter("DrawingURL"), message));
        txt.setBounds(new Point2D.Double(0, 0), new Point2D.Double(getWidth(), getHeight()));
        d.add(txt);
        done(d);
        /*
        Container c = getContentPane();
        c.setLayout(new BorderLayout());
        c.removeAll();
        Throwable error = result;
        error.printStackTrace();
        String message = (error.getMessage() == null) ? error.toString() : error.getMessage();
        MessagePanel mp = new MessagePanel(
        UIManager.getIcon("OptionPane.errorIcon"),
        labels.getFormatted("messageLoadFailed", htmlencode(getParameter("DrawingURL")), htmlencode(message)));
        c.add(mp);
        mp.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent evt) {
        if ("close".equals(evt.getActionCommand())) {
        close();
        }
        }
        });
        mp.revalidate();
        */
      }

      @Override
      protected void finished() {
        long end = System.currentTimeMillis();
        System.out.println("AbstractDrawingApplet startup latency:" + (end - start));
      }
    }.start();
  }