Name: vrR10176 Date: 06/05/2001



Api spec (jdk1.4.0beta-b66) says about the method
javax.imageio.ImageReadParam.setSourceRenderSize():
"public void setSourceRenderSize(Dimension size)
                         throws UnsupportedOperationException
  If the image is able to be rendered at an arbitrary size, sets
the source width and height to the supplied values.
...
  To remove the render size setting, pass in a value of null for size.
...
Throws:
  IllegalArgumentException - if either the width or the height is negative or 0.
..."

There are two issues in implementation of this method:

1. If canSetSourceRenderSize is set to true and null is passed as argument
to the method, it must remove the render size setting without any exception.
But the method throws NullPointerException.

2. If canSetSourceRenderSize is set to true and either the width or the height
is negative or 0, the method does not throw expected IllegalArgumentException.

This bug causes failure of new JCK test:
api/javax_imageio/ImageReadParam/index.html#setSourceRenderSize

To reproduce the issue execute the following test.
----------------- myImageReadParam.java ------------------------
import javax.imageio.ImageReadParam;
import java.awt.Dimension;

public class myImageReadParam extends ImageReadParam {

    public myImageReadParam(){
        super.canSetSourceRenderSize = true;
    }

    public static void main(String[] argv) {

        myImageReadParam imageReadParam = new myImageReadParam();

        // test case 1
        try {
            imageReadParam.setSourceRenderSize(null); // null argument
            System.out.println("Test case 1 passed");
        } catch (Throwable e) {
            System.out.println("Test case 1 failed with " + e);
        }

        // test case 2
        try {
            imageReadParam.setSourceRenderSize(new Dimension( 0, 4)); // width is 0
            imageReadParam.setSourceRenderSize(new Dimension( 4, 0)); // height is 0
            imageReadParam.setSourceRenderSize(new Dimension(-4, 4)); // width is negative
            imageReadParam.setSourceRenderSize(new Dimension( 4,-4)); // height is negative
            System.out.println("Test case 2 failed. IllegalArgumentException was expected");
        } catch (IllegalArgumentException e) {
            System.out.println("Test case 2 passed");
        } catch (Throwable e) {
            System.out.println("est case 2 failed with unexpected exception: " + e);
        }

    }

}
------------ Logs ------------------------------------------
$ java -version
java version "1.4.0-beta_refresh"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta_refresh-b66)
Java HotSpot(TM) Client VM (build 1.4.0-beta_refresh-b66, mixed mode)

$ javac myImageReadParam.java

$ java myImageReadParam
Test case 1 failed with java.lang.NullPointerException
Test case 2 failed. IllegalArgumentException was expected
-----------------------------------------------

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