GeoTiffBasedReader.java 文件源码

/**
 * Registers a file image input strwM SPI for image input stream, if none is yet registered.
 */
protected void registerSpi() {
    final IIORegistry defaultInstance = IIORegistry.getDefaultInstance();
    Iterator<ImageInputStreamSpi> serviceProviders = defaultInstance.getServiceProviders(ImageInputStreamSpi.class, true);
    ImageInputStreamSpi toUnorder = null;
    if (defaultInstance.getServiceProviderByClass(FileImageInputStreamSpi.class) == null) {
        // register only if not already registered
        while (serviceProviders.hasNext()) {
            ImageInputStreamSpi current = serviceProviders.next();
            if (current.getInputClass() == File.class) {
                toUnorder = current;
                break;
            }
        }
        imageInputStreamSpi = new FileImageInputStreamSpi();
        defaultInstance.registerServiceProvider(imageInputStreamSpi);
        if (toUnorder != null) {
            // Make the custom Spi to be the first one to be used.
            defaultInstance.setOrdering(ImageInputStreamSpi.class, imageInputStreamSpi, toUnorder);
        }
    }
}