Examples of javax.imageio.spi.ImageReaderSpi

javax.imageio.spi.ImageReaderSpi
The service provider interface (SPI) for ImageReaders. For more information on service provider classes, see the class comment for the IIORegistry class.
Each ImageReaderSpi provides several types of information about the ImageReader class with which it is associated.
The name of the vendor who defined the SPI class and a brief description of the class are available via the getVendorName, getDescription, and getVersion methods. These methods may be internationalized to provide locale-specific output. These methods are intended mainly to provide short, human-readable information that might be used to organize a pop-up menu or other list.
Lists of format names, file suffixes, and MIME types associated with the service may be obtained by means of the getFormatNames, getFileSuffixes, and getMIMETypes methods. These methods may be used to identify candidate ImageReaders for decoding a particular file or stream based on manual format selection, file naming, or MIME associations (for example, when accessing a file over HTTP or as an email attachment).
A more reliable way to determine which ImageReaders are likely to be able to parse a particular data stream is provided by the canDecodeInput method. This methods allows the service provider to inspect the actual stream contents.
Finally, an instance of the ImageReader class associated with this service provider may be obtained by calling the createReaderInstance method. Any heavyweight initialization, such as the loading of native libraries or creation of large tables, should be deferred at least until the first invocation of this method. @see IIORegistry @see javax.imageio.ImageReader

        List<String> possibleExt = Arrays.asList(new String[] { "grb", "grb2", "grib" });
        // Check if the extensions are contained
        Assert.assertTrue(extensions.containsAll(possibleExt));


        // Creation of a NetCDFReaderSPI objectfor checking if it supports the GRIB extension
        ImageReaderSpi spi = new NetCDFImageReaderSpi();
        // Selection of the suffixes, formatNames and mimetypes from the spi object
        List<String> suffixes = Arrays.asList(spi.getFileSuffixes());
        List<String> formatNames = Arrays.asList(spi.getFormatNames());
        List<String> MIMETypes = Arrays.asList(spi.getMIMETypes());
        // Creation of similar lists containing the values for the grib format
        List<String> gribSuffixes = Arrays.asList(new String[] { "grib", "grb", "grb2" });
        List<String> gribFormatNames = Arrays.asList(new String[] { "grib", "grib2", "GRIB",
                "GRIB2" });
        List<String> gribMIMETypes = Arrays.asList(new String[] { "application/octet-stream" });

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                            LOGGER.log(Level.WARNING,Utils.getFileInfo(fileBeingProcessed));
                        }
                        throw new IllegalArgumentException("Unable to get an input stream for the provided file "+granuleUrl.toString());
                    }
                    // Selection of the ImageReaderSpi from the Stream
                    ImageReaderSpi spi = Utils.getReaderSpiFromStream(null, inStream);
                    // Setting of the ImageReaderSpi to the ImageMosaicConfigHandler in order to set it inside the indexer properties
                    configHandler.setCachedReaderSPI(spi);
                }finally{
                    if(inStream!=null){
                        inStream.close();

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        } else
            throw new IllegalArgumentException("Unsupported Input type:" + input);


        PlanarImage planarImage;
        ImageReader reader;
        ImageReaderSpi readerSpi = spi;
        if (useJAI) {
            final ParameterBlock pbjImageRead = new ParameterBlock();
            pbjImageRead.add(paramInput);
            pbjImageRead.add(imageIndex);
            pbjImageRead.add(Boolean.FALSE);
            pbjImageRead.add(Boolean.FALSE);
            pbjImageRead.add(Boolean.FALSE);
            pbjImageRead.add(null);
            pbjImageRead.add(null);
            pbjImageRead.add(imageReadParam);
            reader = readerSpi.createReaderInstance();
            pbjImageRead.add(reader);


            // Check if to use a simple JAI ImageRead operation or a
            // multithreaded one
            final String jaiOperation = useMultithreading ? "ImageReadMT" : "ImageRead";
            // final String jaiOperation = "ImageRead";
            /** TODO: SET HINTS */
            planarImage = JAI.create(jaiOperation, pbjImageRead, null);
        } else {
            reader = readerSpi.createReaderInstance();
            reader.setInput(paramInput, true, true);
            planarImage = PlanarImage.wrapRenderedImage(reader.read(imageIndex, imageReadParam));
            reader.dispose();
        }
        return planarImage;

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                    reader = Utils.getReader(stream);
                    if (reader != null) {
                        reader.setInput(stream);
                        
                        // Setting up properties
                        final ImageReaderSpi spi = reader.getOriginatingProvider();
                        final int width = reader.getWidth(0);
                        final int height = reader.getHeight(0);
                        int numOverviews = reader.getNumImages(false) - 1; 
                        if (numOverviews < 0) {
                            numOverviews = 0;

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        File file = TestData.file(this, "sampleGrib.grb2");
        // Check if the grib file is accepted by the NetCDF driver
        AbstractGridFormat format = new GRIBFormat();
        Assert.assertTrue(format.accepts(file));
        // Check if the netcdf reader spi object can read the input file
        ImageReaderSpi spi = new NetCDFImageReaderSpi();
        Assert.assertTrue(spi.canDecodeInput(file));
    }

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            Iterator readerSPIs =
                registry.getServiceProviders(imageReaderClass,
                                             new JPEGSPIFilter(),
                                             true);
            if(readerSPIs.hasNext()) {
                ImageReaderSpi jpegReaderSPI =
                    (ImageReaderSpi)readerSPIs.next();
                jpegReader = jpegReaderSPI.createReaderInstance();
            }
        } catch(Exception e) {
            // Ignore it ...
        }

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     */
    private static class JPEGSPIFilter implements ServiceRegistry.Filter {
        JPEGSPIFilter() {}


        public boolean filter(Object provider) {
            ImageReaderSpi readerSPI = (ImageReaderSpi)provider;


            if(readerSPI != null) {
                String streamMetadataName =
                    readerSPI.getNativeStreamMetadataFormatName();
                if(streamMetadataName != null) {
                    return streamMetadataName.equals(STREAM_METADATA_NAME);
                } else {
                    return false;
                }

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        IIORegistry theRegistry = initializer.getRegistry();
        // Checks for each Spi class if it is present and then it is added to the list.
        for (String spi : readerSpi) {
            try {
                Class<?> clazz = Class.forName(spi);
                ImageReaderSpi reader = (ImageReaderSpi) theRegistry
                        .getServiceProviderByClass(clazz);
                if (reader != null) {
                    this.spi=reader;
                    break;
                }

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        if (!isAggressiveInputStreamSupported() && aggressiveInputStreamOptimization) {
            throw new UnsupportedOperationException(OPERATION_NOT_SUPPORTED);
        }


        // Selection of the first priority writerSpi
        ImageReaderSpi newSpi = getReaderSpi();
        
        if(newSpi!=null){
            // Creation of the associated Writer
            ImageReader reader = null;
            ImageInputStream stream = null;
            try {
                reader = newSpi.createReaderInstance();
                if (source instanceof FileResource) {
                    // file
                    stream= new FileImageInputStreamExtImpl(((FileResource)source).getFile());
                    // Image reading
                    reader.setInput(stream);

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