Example usage for com.vaadin.server ConnectorResource ConnectorResource

Introduction

In this page you can find the example usage for com.vaadin.server ConnectorResource ConnectorResource.

Prototype

ConnectorResource

Source Link

Usage

From source file:com.foc.vaadin.gui.components.chart.JFreeChartWrapper_Modified.java

License:Apache License

@Override
public Resource getSource() {
    if (res == null) {
        res = new ConnectorResource() {
            private ByteArrayInputStream bytestream = null;

            ByteArrayInputStream getByteStream() {
                if (chart != null && bytestream == null) {
                    int widht = getGraphWidth();
                    int height = getGraphHeight();

                    if (mode == RenderingMode.SVG) {
                        //VAADIN 7
                        /*
                        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
                              .newInstance();
                        DocumentBuilder docBuilder = null;
                        try {/*from  www.  j  a v a 2s  . co  m*/
                           docBuilder = docBuilderFactory
                                 .newDocumentBuilder();
                        } catch (ParserConfigurationException e1) {
                           throw new RuntimeException(e1);
                        }
                        Document document = docBuilder.newDocument();
                        Element svgelem = document.createElement("svg");
                        document.appendChild(svgelem);
                                
                        // Create an instance of the SVG Generator
                                
                        SVGGraphics2D svgGenerator = new SVGGraphics2D(document);
                                
                        // draw the chart in the SVG generator
                        chart.draw(svgGenerator, new Rectangle(widht, height));
                        Element el = svgGenerator.getRoot();
                        el.setAttributeNS(null, "viewBox", "0 0 " + widht + " " + height + "");
                        el.setAttributeNS(null, "style", "width:100%;height:100%;");
                        el.setAttributeNS(null, "preserveAspectRatio", getSvgAspectRatio());
                                
                        // Write svg to buffer
                        ByteArrayOutputStream baoutputStream = new ByteArrayOutputStream();
                        Writer out;
                        try {
                           OutputStream outputStream = gzipEnabled ? new GZIPOutputStream(
                                 baoutputStream) : baoutputStream;
                           out = new OutputStreamWriter(outputStream,
                                 "UTF-8");
                                
                        //                         * don't use css, FF3 can'd deal with the result
                        //                         * perfectly: wrong font sizes
                           boolean useCSS = false;
                           svgGenerator.stream(el, out, useCSS, false);
                           outputStream.flush();
                           outputStream.close();
                           bytestream = new ByteArrayInputStream(
                                 baoutputStream.toByteArray());
                        } catch (Exception e) {
                           e.printStackTrace();
                        }
                        */
                    } else {
                        // Draw png to bytestream
                        try {
                            byte[] bytes = ChartUtilities.encodeAsPNG(chart.createBufferedImage(widht, height));
                            bytestream = new ByteArrayInputStream(bytes);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                    }

                } else {
                    bytestream.reset();
                }
                return bytestream;
            }

            @Override
            public String getMIMEType() {
                if (mode == RenderingMode.PNG) {
                    return "image/png";
                } else {
                    return "image/svg+xml";
                }
            }

            @Override
            public DownloadStream getStream() {
                DownloadStream downloadStream = new DownloadStream(getByteStream(), getMIMEType(),
                        getFilename());
                if (gzipEnabled && mode == RenderingMode.SVG) {
                    downloadStream.setParameter("Content-Encoding", "gzip");
                }
                return downloadStream;
            }

            @Override
            public String getFilename() {
                if (mode == RenderingMode.PNG) {
                    return "graph.png";
                } else {
                    return gzipEnabled ? "graph.svgz" : "graph.svg";
                }
            }
        };
    }
    return res;
}

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