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

                // Grid Format?
                Field field = baseGDALGridFormatClass.getDeclaredField(SPI_ATTRIBUTE_GRID_FORMAT);
                field.setAccessible(true);
                Class<?> type = field.getType();
                if (type != null && type.equals(ImageReaderSpi.class)) {
                    ImageReaderSpi spi = (ImageReaderSpi) field.get(format);
                    if (spi instanceof GDALImageReaderSpi) {
                        gdalSPI = (GDALImageReaderSpi) spi;
                    }
                }
            }

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        this.ignoreMetadata = ignoreMetadata;
        this.input = input;
    }


    private boolean isSupported(Object input) {
        ImageReaderSpi spi = getOriginatingProvider();
        if (null != spi) {
            Class[] outTypes = spi.getInputTypes();
            for (Class<?> element : outTypes) {
                if (element.isInstance(input)) {
                    return true;
                }
            }

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        public boolean hasNext() {
            return iter.hasNext();
        }


        public ImageReader next() {
            ImageReaderSpi spi = null;
            try {
                spi = (ImageReaderSpi)iter.next();
                return spi.createReaderInstance();
            } catch (IOException e) {
                // Deregister the spi in this case, but only as
                // an ImageReaderSpi
                theRegistry.deregisterServiceProvider(spi, ImageReaderSpi.class);
            }

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            this.input = input;
        }


        public boolean filter(Object elt) {
            try {
                ImageReaderSpi spi = (ImageReaderSpi)elt;
                ImageInputStream stream = null;
                if (input instanceof ImageInputStream) {
                    stream = (ImageInputStream)input;
                }


                // Perform mark/reset as a defensive measure
                // even though plug-ins are supposed to take
                // care of it.
                boolean canDecode = false;
                if (stream != null) {
                    stream.mark();
                }
                canDecode = spi.canDecodeInput(input);
                if (stream != null) {
                    stream.reset();
                }


                return canDecode;

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                                           ClassLoader.getSystemClassLoader());
        } catch (ClassNotFoundException e) {
            return null;
        }


        ImageReaderSpi readerSpi = (ImageReaderSpi)
            theRegistry.getServiceProviderByClass(readerSpiClass);
        if (readerSpi == null) {
            return null;
        }


        try {
            return readerSpi.createReaderInstance();
        } catch (IOException e) {
            // Deregister the spi in this case, but only as a readerSpi
            theRegistry.deregisterServiceProvider(readerSpi,
                                                  ImageReaderSpi.class);
            return null;

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            throw new IllegalArgumentException("reader == null!");
        }
        if (writer == null) {
            throw new IllegalArgumentException("writer == null!");
        }
        ImageReaderSpi readerSpi = reader.getOriginatingProvider();
        ImageWriterSpi writerSpi = writer.getOriginatingProvider();
        ServiceRegistry.Filter filter =
            new TranscoderFilter(readerSpi, writerSpi);


        Iterator iter;

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    public static ImageWriter getImageWriter(ImageReader reader) {
        if (reader == null) {
            throw new IllegalArgumentException("reader == null!");
        }


        ImageReaderSpi readerSpi = reader.getOriginatingProvider();
        if (readerSpi == null) {
            Iterator readerSpiIter;
            // Ensure category is present
            try {
                readerSpiIter = 
                    theRegistry.getServiceProviders(ImageReaderSpi.class,
                                                    false);
            } catch (IllegalArgumentException e) {
                return null;
            }


            while (readerSpiIter.hasNext()) {
                ImageReaderSpi temp = (ImageReaderSpi) readerSpiIter.next();
                if (temp.isOwnReader(reader)) {
                    readerSpi = temp;
                    break;
                }
            }
            if (readerSpi == null) {

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                                           ClassLoader.getSystemClassLoader());
        } catch (ClassNotFoundException e) {
            return null;
        }


        ImageReaderSpi readerSpi = (ImageReaderSpi)
            theRegistry.getServiceProviderByClass(readerSpiClass);
        if (readerSpi == null) {
            return null;
        }


        try {
            return readerSpi.createReaderInstance();
        } catch (IOException e) {
            // Deregister the spi in this case, but only as a readerSpi
            theRegistry.deregisterServiceProvider(readerSpi,
                                                  ImageReaderSpi.class);
            return null;

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            throw new IllegalArgumentException("reader == null!");
        }
        if (writer == null) {
            throw new IllegalArgumentException("writer == null!");
        }
        ImageReaderSpi readerSpi = reader.getOriginatingProvider();
        ImageWriterSpi writerSpi = writer.getOriginatingProvider();
        ServiceRegistry.Filter filter =
            new TranscoderFilter(readerSpi, writerSpi);


        Iterator iter;

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        public boolean hasNext() {
            return iter.hasNext();
        }


        public ImageReader next() {
            ImageReaderSpi spi = null;
            try {
                spi = (ImageReaderSpi)iter.next();
                return spi.createReaderInstance();
            } catch (IOException e) {
                // Deregister the spi in this case, but only as
                // an ImageReaderSpi
                theRegistry.deregisterServiceProvider(spi, ImageReaderSpi.class);
            }

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