UshortOutOfMemoryTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 6294363
 * @summary Test verifies that creation of tree representation of the native
 *          image metadata for USHORT_GRAY images does not cause the
 *          OutOfMemoryError
 * @run main/othervm -Xms32M -Xmx32M UshortOutOfMemoryTest
 */

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;

public class UshortOutOfMemoryTest {
    private int type;
    private ImageWriter w;

    public UshortOutOfMemoryTest(int type) {
        this.type = type;
        w = ImageIO.getImageWritersByFormatName("GIF").next();
    }

    public void testGetAsTree() {
        ImageWriteParam p = w.getDefaultWriteParam();
        IIOMetadata m =
            w.getDefaultImageMetadata(ImageTypeSpecifier.createFromBufferedImageType(type), p);

        String format = m.getNativeMetadataFormatName();
        System.out.println("native format: " + format);

        int count = 0;
        try {
            while (count < 100) {
                System.out.println(" test " + count++);
                m.getAsTree(format);
            }
        } catch (OutOfMemoryError e) {
            System.gc();
            throw new RuntimeException("Test failed. Number of performed operations: " + count, e);
        }
    }


    public static void main(String[] args) throws IOException {
        UshortOutOfMemoryTest t = new UshortOutOfMemoryTest(
                BufferedImage.TYPE_USHORT_GRAY);
        t.testGetAsTree();
    }
}