ImageIO SPI Ordering.java

    static <T> void setOrder(Class<T> pt, String p1, String p2) {
        IIORegistry iioRegistry = IIORegistry.getDefaultInstance();
        T sp1 = null;
        T sp2 = null;
        Iterator<T> i = iioRegistry.getServiceProviders(pt, true);
        while (i.hasNext()) {
            T p = i.next();
            if (p1.equals(p.getClass().getName())) {
                sp1 = p;
                System.err.println("1: " + sp1.getClass().getName());
            } else if (p2.equals(p.getClass().getName())) {
                sp2 = p;
                System.err.println("2: " + sp2.getClass().getName());
            }
        }
        if (sp1 == null || sp2 == null) {
            throw new IllegalArgumentException(p1 + " or " + p2 + " not found");
        }
        iioRegistry.setOrdering(pt, sp1, sp2);
    }


        setOrder(ImageReaderSpi.class,
                 "com.sixlegs.png.iio.PngImageReaderSpi",
                 "com.sun.imageio.plugins.png.PNGImageReaderSpi");