Name: bkR10012 Date: 04/23/2001


Spec. of the class javax.imageio.ImageReader says:

"getDestination

protected static BufferedImage getDestination(ImageReadParam param,
                                              Iterator imageTypes,
                                              int width,
                                              int height)
                                       throws IIOException

.....
Throws:
         IIOException - if the ImageTypeSpecifier specified by param
         does not match any of the legal ones from imageTypes.
         IllegalArgumentException - if the resulting image would have
         a width or height less than 1."
     
But method getDestination throws unexpected exceptions in following cases:

NullPointerException - if imageTypes is null
NoSuchElementException - if imageTypes is empty
ClassCastException - if imageTypes contains value of improper type
IllegalArgumentException - if dimensions (width, height) are too large

See test source and log below.
---------------------------------------- test.java
import javax.imageio.*;
import javax.imageio.spi.*;
import javax.imageio.metadata.*;
import java.util.*;
import java.awt.image.BufferedImage;
import java.io.IOException;

public class test {

    public static void main(String argv[]) {
        Vector imageTypes = new Vector();
        
        try {
            DummyImageReaderImpl.getDestination(null, null, 5, 10);
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 1: " + ee);
        }

        try {
            DummyImageReaderImpl.getDestination(null, imageTypes.iterator(),
                                                5, 10);
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 2: " + ee);
        }

        imageTypes.add("abc");
        try {
            DummyImageReaderImpl.getDestination(null, imageTypes.iterator(),
                                                5, 10);
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 3: " + ee);
        }
        
        imageTypes.clear();
        ImageTypeSpecifier its = ImageTypeSpecifier.createFromBufferedImageType
            (BufferedImage.TYPE_INT_RGB);
        imageTypes.add(its);
        try {
            DummyImageReaderImpl.getDestination(null,
                                                imageTypes.iterator(),
                                                Integer.MAX_VALUE,
                                                Integer.MAX_VALUE);
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 4: " + ee);
        }
    }
}

class DummyImageReaderImpl extends ImageReader {
    public DummyImageReaderImpl(ImageReaderSpi originatingProvider) {
        super(originatingProvider);
    }
    public static BufferedImage getDestination(ImageReadParam param,
                                               Iterator imageTypes,
                                               int width,
                                               int height) throws IIOException {
        return ImageReader.getDestination(param, imageTypes, width, height);
    }
    public int getNumImages(boolean allowSearch) throws IOException {return 1;}
    public int getWidth(int imageIndex) throws IOException {return 1;}
    public int getHeight(int imageIndex) throws IOException {return 1;}
    public Iterator getImageTypes(int imageIndex)
        throws IOException {return null;}
    public IIOMetadata getStreamMetadata() throws IOException {return null;}
    public IIOMetadata getImageMetadata(int imageIndex)
        throws IOException {return null;}
    public BufferedImage read(int imageIndex, ImageReadParam param)
        throws IOException {return null;}
}
----------------------------------------
% java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b61)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b61, mixed mode)
% java test
Unexpected exception 1: java.lang.NullPointerException
Unexpected exception 2: java.util.NoSuchElementException
Unexpected exception 3: java.lang.ClassCastException: java.lang.String
Unexpected exception 4: java.lang.IllegalArgumentException: Dimensions
(width=2147483647 height=2147483647) are too large
----------------------------------------

This bug causes failure of the new JCK test
api/javax_imageio/ImageReader/index.html#getDestination

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