Example showing how to reset the ordering of ImageReaderSpis in Image I/O : Image IO « 2D Graphics GUI « Java






Example showing how to reset the ordering of ImageReaderSpis in Image I/O

Example showing how to reset the ordering of ImageReaderSpis in Image I/O
      

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 */
import java.util.Iterator;

import javax.imageio.spi.IIORegistry;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.spi.ServiceRegistry;

/**
 * Example showing how to reset the ordering of ImageReaderSpis in Image I/O.
 * This is particularly applicable to the case where metadata handling is a
 * requirement and is of special importance for the JPEG format as the
 * JAI-Image I/O JPEG plug-ins do not handle metadata and have a higher
 * priority setting in the IIORegistry than do the core J2SE JPEG plug-ins.
 */
public class SetOrderingExample {
    public static void main(String[] args) {
        IIORegistry registry = IIORegistry.getDefaultInstance();

        // Print the initial ordered list of readers.
        System.out.println("- Initial list of readers -");
        Iterator providers =
            registry.getServiceProviders(ImageReaderSpi.class, true);
        while(providers.hasNext()) {
            ImageReaderSpi provider = (ImageReaderSpi) providers.next();
            System.out.println(provider.getPluginClassName());
        }
        System.out.println("");

        // Get the reader SPIs for JPEG.
        providers = registry.getServiceProviders(ImageReaderSpi.class,
                                                 new JPEGFilter(),
                                                 true);

        // Save reader SPIs for JPEG according to whether they support
        // native image metadata. This removes the dependence on knowing
        // the class name of the associated reader plug-in.
        ImageReaderSpi readerMetadataSPI = null;
        ImageReaderSpi readerNoMetadataSPI = null;
        while(providers.hasNext()) {
            ImageReaderSpi readerSPI = (ImageReaderSpi)providers.next();
            if(readerSPI.getNativeImageMetadataFormatName() != null) {
                readerMetadataSPI = readerSPI;
            } else {
                readerNoMetadataSPI = readerSPI;
            }
        }

        // Update ordering if both metadata-capable and -incapable readers
        // are detected.
        if(readerMetadataSPI != null && readerNoMetadataSPI != null) {
            // Remove ordering that places metadata-capable reader last.
            boolean unsetResult = registry.unsetOrdering(ImageReaderSpi.class,
                                                         readerNoMetadataSPI,
                                                         readerMetadataSPI);

            // Add ordering that places metadata-capable reader first.
            boolean setResult = registry.setOrdering(ImageReaderSpi.class,
                                                     readerMetadataSPI,
                                                     readerNoMetadataSPI);
        }

        // Print the final ordered list of readers.
        System.out.println("- Final list of readers -");
        providers = registry.getServiceProviders(ImageReaderSpi.class, true);
        while(providers.hasNext()) {
            ImageReaderSpi provider = (ImageReaderSpi) providers.next();
            System.out.println(provider.getPluginClassName());
        }
    }
}

/**
 * Filter which returns <code>true</code> if and only if the provider is
 * an <code>ImageReaderSpi</code> which supports the JPEG format.
 */
class JPEGFilter implements ServiceRegistry.Filter {
    JPEGFilter() {}

    public boolean filter(Object provider) {
        if(!(provider instanceof ImageReaderSpi)) {
            return false;
        }

        ImageReaderSpi readerSPI = (ImageReaderSpi)provider;
        String[] formatNames = readerSPI.getFormatNames();
        for(int i = 0; i < formatNames.length; i++) {
            if(formatNames[i].equalsIgnoreCase("JPEG")) {
                return true;
            }
        }

        return false;
    }
}

           
         
    
    
    
    
    
  








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