Example usage for com.vaadin.server StreamResource.StreamSource StreamResource.StreamSource

Introduction

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

Prototype

StreamResource.StreamSource

Source Link

Usage

From source file:com.adonis.ui.menu.Menu.java

private void showUploadedImage(UploadField upload, Image image, String fileName, String newNameFile)
        throws IOException {
    File value = (File) upload.getValue();
    //copy to resources
    FileReader.copyFile(value.getAbsolutePath().toString(), VaadinUtils.getResourcePath(newNameFile));
    //copy to server directory
    FileReader.createDirectoriesFromCurrent(getInitialPath());
    FileReader.copyFile(value.getAbsolutePath().toString(),
            VaadinUtils.getInitialPath() + File.separator + newNameFile);
    FileInputStream fileInputStream = new FileInputStream(value);
    long byteLength = value.length(); //bytecount of the file-content

    byte[] filecontent = new byte[(int) byteLength];
    fileInputStream.read(filecontent, 0, (int) byteLength);
    final byte[] data = filecontent;

    StreamResource resource = new StreamResource(new StreamResource.StreamSource() {
        @Override/*w w w. j  a v  a  2s .c om*/
        public InputStream getStream() {
            return new ByteArrayInputStream(data);
        }
    }, fileName);

    image.setSource(resource);
    image.setVisible(true);
}

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From source file:com.esofthead.mycollab.community.ui.chart.JFreeChartWrapper.java

License:Open Source License

@Override
public Resource getSource() {
    if (res == null) {
        StreamSource streamSource = new StreamResource.StreamSource() {
            private ByteArrayInputStream bytestream = null;

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

                    if (mode == RenderingMode.SVG) {

                        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
                        DocumentBuilder docBuilder = null;
                        try {
                            docBuilder = docBuilderFactory.newDocumentBuilder();
                        } catch (ParserConfigurationException e1) {
                            throw new RuntimeException(e1);
                        }/*from   w  w  w  .j a v a  2  s. co m*/
                        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(width, height));
                        Element el = svgGenerator.getRoot();
                        el.setAttributeNS(null, "viewBox", "0 0 " + width + " " + 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) {
                            log.error("Error while generating SVG chart", e);
                        }
                    } else {
                        // Draw png to bytestream
                        try {
                            byte[] bytes = ChartUtilities.encodeAsPNG(chart.createBufferedImage(width, height));
                            bytestream = new ByteArrayInputStream(bytes);
                        } catch (Exception e) {
                            log.error("Error while generating PNG chart", e);
                        }

                    }

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

            @Override
            public InputStream getStream() {
                return getByteStream();
            }
        };

        res = new StreamResource(streamSource, String.format("graph%d", System.currentTimeMillis())) {

            @Override
            public int getBufferSize() {
                if (getStreamSource().getStream() != null) {
                    try {
                        return getStreamSource().getStream().available();
                    } catch (IOException e) {
                        log.warn("Error while get stream info", e);
                        return 0;
                    }
                } else {
                    return 0;
                }
            }

            @Override
            public long getCacheTime() {
                return 0;
            }

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

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

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

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From source file:com.esofthead.mycollab.ui.chart.JFreeChartWrapper.java

License:Open Source License

@Override
public Resource getSource() {
    if (res == null) {
        StreamSource streamSource = new StreamResource.StreamSource() {
            private ByteArrayInputStream bytestream = null;

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

                    if (mode == RenderingMode.SVG) {
                        // Create an instance of the SVG Generator
                        SVGGraphics2D svgGenerator = new SVGGraphics2D(width, height);

                        // draw the chart in the SVG generator
                        chart.draw(svgGenerator, new Rectangle(width, height));
                        // create an xml string in svg format from the drawing
                        String drawingSVG = svgGenerator.getSVGElement();
                        return new ByteArrayInputStream(drawingSVG.getBytes(StandardCharsets.UTF_8));
                    } else {
                        // Draw png to bytestream
                        try {
                            byte[] bytes = ChartUtilities.encodeAsPNG(chart.createBufferedImage(width, height));
                            bytestream = new ByteArrayInputStream(bytes);
                        } catch (Exception e) {
                            log.error("Error while generating PNG chart", e);
                        }/*from   w w  w . jav a2  s  . c  o m*/

                    }

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

            @Override
            public InputStream getStream() {
                return getByteStream();
            }
        };

        res = new StreamResource(streamSource, String.format("graph%d", System.currentTimeMillis())) {

            @Override
            public int getBufferSize() {
                if (getStreamSource().getStream() != null) {
                    try {
                        return getStreamSource().getStream().available();
                    } catch (IOException e) {
                        log.warn("Error while get stream info", e);
                        return 0;
                    }
                } else {
                    return 0;
                }
            }

            @Override
            public long getCacheTime() {
                return 0;
            }

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

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

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

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