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
  public void setData(String text) {
    if (text != null && text.length() > 0) {
      InputStream in = null;
      try {
        Object result = null;
        Drawing drawing = createDrawing();
        // Try to read the data using all known input formats.
        for (InputFormat fmt : drawing.getInputFormats()) {
          try {
            fmt.read(in, drawing);
            in = new ByteArrayInputStream(text.getBytes("UTF8"));
            result = drawing;
            break;
          } catch (IOException e) {
            result = e;
          }
        }
        if (result instanceof IOException) {
          throw (IOException) result;
        }

        setDrawing(drawing);
      } catch (Throwable e) {
        getDrawing().removeAllChildren();
        SVGTextFigure tf = new SVGTextFigure();
        tf.setText(e.getMessage());
        tf.setBounds(new Point2D.Double(10, 10), new Point2D.Double(100, 100));
        getDrawing().add(tf);
        e.printStackTrace();
      } finally {
        if (in != null) {
          try {
            in.close();
          } catch (IOException ex) {
            ex.printStackTrace();
          }
        }
      }
    }
  }