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From "Ilya Okomin (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-2689) [classlib][awt] java.awt.image.RescaleOp.getOffsets() throws unexpected IAE if an array has zero legth size.
Date Thu, 14 Dec 2006 11:50:22 GMT
[classlib][awt] java.awt.image.RescaleOp.getOffsets() throws unexpected IAE if an array has
zero legth size.

                 Key: HARMONY-2689
                 URL: http://issues.apache.org/jira/browse/HARMONY-2689
             Project: Harmony
          Issue Type: Bug
          Components: Classlib
            Reporter: Ilya Okomin
            Priority: Minor

There is no mention about any exception in the specification.
Harmony throws IAE for RescaleOp.getOffsets(float[] offsets) if offsets is empty array while
RI returns empty array.
The same problem is for getScaleFactors(float[] scaleFactors) method.

-------------- test.java -----------------
import java.awt.image.*;
import junit.framework.TestCase;
import java.awt.*;
public class test extends TestCase {

    public void testcase1() {                                  
        RescaleOp res = new RescaleOp(new float[1],new float[2],null);         
assertEquals(res.getOffsets(new float[] {}).length, 0);                         
    public void testcase2() {                           
        RescaleOp res = new RescaleOp(new float[1],new float[2],null);         
assertEquals(res.getScaleFactors(new float[] {}).length, 0);                    
Output on RI
Time: 0

OK (2 tests)

Output on Harmony_drlvm/j9:
Time: 0
There were 2 errors:
1) testcase1(test)java.lang.ArrayIndexOutOfBoundsException
        at java.lang.System.arraycopy(System.java:249)
        at java.awt.image.RescaleOp.getOffsets(RescaleOp.java:92)
        at test.testcase1(test.java:8)
        at java.lang.reflect.AccessibleObject.invokeV(AccessibleObject.java:25)
2) testcase2(test)java.lang.ArrayIndexOutOfBoundsException
        at java.lang.System.arraycopy(System.java:249)
        at java.awt.image.RescaleOp.getScaleFactors(RescaleOp.java:83)
        at test.testcase2(test.java:12)
        at java.lang.reflect.AccessibleObject.invokeV(AccessibleObject.java:25)

Tests run: 2,  Failures: 0,  Errors: 2

This issue can be treated as non-bug difference, because it is unclear what is the appropriate
result if sizes of given array and sizes of offsets and scaleFactors arrays in RescaleOp object
are different. Otherwise, to be compatible with RI I can suggest to use min between argument
array and RescaleOp object's array length as length param in j.l.System.arraycopy() call.

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