Example usage for javax.imageio ImageReader read

Introduction

In this page you can find the example usage for javax.imageio ImageReader read.

Prototype

public BufferedImage read(int imageIndex) throws IOException

Source Link

Document

Reads the image indexed by imageIndex and returns it as a complete BufferedImage , using a default ImageReadParam .

Usage

From source file:com.occamlab.te.parsers.ImageParser.java

private static Document parse(InputStream source, Element instruction, PrintWriter logger) throws Exception {
    ImageReader reader;
    try {//  www .  ja  va2 s  . co  m
        ImageInputStream iis = ImageIO.createImageInputStream(source);
        reader = ImageIO.getImageReaders(iis).next();
        reader.setInput(iis);
    } catch (Exception e) {
        logger.println("No image handlers available for the data stream. " + e.getMessage());
        throw e;
    }

    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    Document doc = db.newDocument();

    TransformerFactory tf = TransformerFactory.newInstance();
    Transformer t = tf.newTransformer();
    t.transform(new DOMSource(instruction), new DOMResult(doc));

    Element new_instruction = doc.getDocumentElement();

    int framesRead = 0;
    boolean containsFrames = false;
    Element framesElement = null;
    Element metadataElement = null;

    NodeList nodes = new_instruction.getChildNodes();
    for (int i = 0; i < nodes.getLength(); i++) {
        Node node = nodes.item(i);
        if (node.getNodeType() == Node.ELEMENT_NODE) {
            // System.out.println(node.getLocalName());
            if (node.getLocalName().equals("type")) {
                node.setTextContent(reader.getFormatName().toLowerCase());
            } else if (node.getLocalName().equals("frames")) {
                framesElement = (Element) node;
                containsFrames = true;
            } else if (node.getLocalName().equals("metadata")) {
                metadataElement = (Element) node;
            } else if (node.getLocalName().equals("frame")) {
                int frame;
                String frameStr = ((Element) node).getAttribute("num");
                if (frameStr.length() == 0) {
                    frame = framesRead;
                    framesRead++;
                    ((Element) node).setAttribute("num", Integer.toString(frame));
                } else {
                    frame = Integer.parseInt(frameStr);
                    framesRead = frame + 1;
                }
                processFrame(reader, frame, node.getChildNodes(), logger);
                containsFrames = true;
            }
        }
    }

    if (containsFrames) {
        if (metadataElement != null) {
            IIOMetadata metadata = reader.getStreamMetadata();
            if (metadata != null) {
                String format = metadataElement.getAttribute("format");
                if (format.length() == 0) {
                    format = metadata.getNativeMetadataFormatName();
                }
                Node tree = metadata.getAsTree(format);
                t.transform(new DOMSource(tree), new DOMResult(metadataElement));
            }
        }
        if (framesElement != null) {
            boolean allowSearch = !reader.isSeekForwardOnly();
            int frames = reader.getNumImages(allowSearch);
            if (frames == -1) {
                try {
                    while (true) {
                        reader.read(framesRead);
                        framesRead++;
                    }
                } catch (Exception e) {
                    jlogger.log(Level.SEVERE, "", e);

                    frames = framesRead + 1;
                }
            }
            framesElement.setTextContent(Integer.toString(frames));
        }
    } else {
        processFrame(reader, 0, nodes, logger);
        framesRead = 1;
    }

    // t.transform(new DOMSource(doc), new StreamResult(System.out));
    return doc;
}