Example usage for javax.imageio ImageReader isSeekForwardOnly

Introduction

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

Prototype

public boolean isSeekForwardOnly() 

Source Link

Document

Returns true if the current input source has been marked as seek forward only by passing true as the seekForwardOnly argument to the setInput method.

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 {/*  ww w . j a v  a  2 s .c om*/
        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;
}

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