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  1. JDK
  2. JDK-4455704

ImageWriter: IllegalStateException instead of UnsupportedOperationException

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    • Subcomponent:
    • Resolved In Build:
      beta2
    • CPU:
      generic
    • OS:
      generic

      Description



      Name: bkR10012 Date: 05/08/2001


      According to the spec. of the class javax.imageio.ImageWriter
      the default implementation throws an UnsupportedOperationException
      for almost all unsupported operation.

      But for methods replacePixels and endReplacePixels spec says:
      "
      .....
           The default implementation throws an IllegalStateException."

      I suppose that behavior of all methods should be similar
      and these methods should throw UnsupportedOperationException.

      Also spec. says about endWriteEmpty and endInsertEmpty methods:
      "
      .....
           The default implementation throws an UnsupportedOperationException
           if the output is non-null. "

      But these methods throw unexpected IllegalStateException.

      Note also that UnsupportedOperationException is not listed in
      the Throws section of the methods spec.

      See test source and log below.
      ---------------------------------------- test.java
      import javax.imageio.*;
      import javax.imageio.spi.*;
      import javax.imageio.metadata.*;
      import javax.imageio.stream.MemoryCacheImageOutputStream;
      import java.io.IOException;
      import java.io.ByteArrayOutputStream;

      public class test {
          private final static byte[] ba = {};

          public static void main(String argv[]) {

              ImageWriter iwriter = new DummyImageWriterImpl(null);
              MemoryCacheImageOutputStream mcios = new MemoryCacheImageOutputStream
                  (new ByteArrayOutputStream());
              iwriter.setOutput(mcios);

              try {
                  iwriter.endWriteEmpty();
              } catch (UnsupportedOperationException e) {
                  System.out.println("endWriteEmpty: OKAY");
              } catch (Throwable ee) {
                  System.out.println("endWriteEmpty Unexpected exception: " + ee);
              }

              try {
                  iwriter.endInsertEmpty();
              } catch (UnsupportedOperationException e) {
                  System.out.println("endInsertEmpty: OKAY");
              } catch (Throwable ee) {
                  System.out.println("endInsertEmpty Unexpected exception: " + ee);
              }
          }
      }

      class DummyImageWriterImpl extends ImageWriter {

          public DummyImageWriterImpl(ImageWriterSpi originatingProvider) {
              super(originatingProvider);
          }
          public IIOMetadata convertImageMetadata(IIOMetadata inData,
                                                  ImageTypeSpecifier imageType,
                                                  ImageWriteParam param) {
              return null;
          }
          public IIOMetadata convertStreamMetadata(IIOMetadata inData,
                                                   ImageWriteParam param) {
              return null;
          }
          public IIOMetadata getDefaultImageMetadata(ImageTypeSpecifier imageType,
                                                     ImageWriteParam param) {
              return null;
          }
          public IIOMetadata getDefaultStreamMetadata(ImageWriteParam param) {
              return null;
          }
          public void write(IIOMetadata streamMetadata,
                            IIOImage image,
                            ImageWriteParam param) throws IOException {
              return;
          }
      }
      ----------------------------------------
      % java -version
      java version "1.4.0-beta"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b63)
      Java HotSpot(TM) Client VM (build 1.4.0-beta-b63, mixed mode)
      % java test
      endWriteEmpty Unexpected exception: java.lang.IllegalStateException: No call to
      prepareInsertEmpty!
      endInsertEmpty Unexpected exception: java.lang.IllegalStateException: No call to
      prepareInsertEmpty!
      ----------------------------------------
      This bug causes failures of the new JCK tests
      api/javax_imageio/ImageWriter/index.html#endWriteEmpty
      api/javax_imageio/ImageWriter/index.html#endInsertEmpty

      ======================================================================

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            Assignee:
            dricesunw Daniel Rice (Inactive)
            Reporter:
            kuzsunw Kuz Kuz (Inactive)
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