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From "Vladimir Ivanov" <ivavladi...@gmail.com>
Subject Re: Suggestion (was: Re: [jira] Closed: (HARMONY-932) [classlib][nio]java.nio.?hannel.DatagramChannel.read(ByteBuffer[] , int, Integer.MAX_VALUE) throws NotYetConnectedException while RI throws IndexOutOfBoundsException)
Date Fri, 21 Jul 2006 05:40:01 GMT
On 7/21/06, Andrew Zhang <zhanghuangzhu@gmail.com> wrote:
>Invoking assertArray(array.length, 0, -1) will throw NullPointerException
>instead of IndexOutOfBoundException.  It's not compatible with RI.
>Do you think so?

No. We should check reference before using :) To corectly process a NPE we
should write:

method m(Object[] array, int offset, int length) {
    if (array == null)
        throw new NullPointerException();
    assertArrayIndex(array.length, offset, length);
    ..........
}

or write something like
 void assertArrayIndex(Object[] array, int offset, int length){
       if (array == null)
           throw new NullPointerException();
       if (offset < 0)
           throw new IndexOutOfBoundsException("Negative offset");
       if (length < 0)
             throw new IndexOutOfBoundsException("Negative length");
       if ((long)offset + (long)length >  array.length)
           throw new IndexOutOfBoundsException("offset+length exceed buffer
size");
}

  thanks, Vladimir

On 7/21/06, Andrew Zhang <zhanghuangzhu@gmail.com> wrote:

> On 7/21/06, Vladimir Ivanov <ivavladimir@gmail.com> wrote:
> >
> > Seems, the same problem is existing not in NIO module only. In any case,
> > it
> > will be useful to use one method instead of many copies of code. That's
> > for
> > me, I just can't find the appropriate class for 'package' functions so
> fix
> > it inline.
> > Seems, the function like:
> > void assertArrayIndex(int arrayLength, int offset, int length){
> >    if(offset < 0 || length < 0 || (long)offset + (long)length
> > >  arrayLength){
> >        throw new IndexOutOfBoundsException();
> >    }
> > }
> > or may be even something like that
> > void assertArrayIndex(int arrayLength, int offset, int length){
> >        if (offset < 0)
> >            throw new IndexOutOfBoundsException("Negative offset");
> >        if (length < 0)             throw new
> > IndexOutOfBoundsException("Negative length");
> >        if ((long)offset + (long)length >  arrayLength)
> >            throw new IndexOutOfBoundsException("offset+length exceed
> > buffer
> > size");
> > }
>
>
> Hi Vladimir, I have some comments on your revised method. :)
> Using int as the first parameter will cause problem. Consider:
> Invoking assertArray(array.length, 0, -1) will throw NullPointerException
> instead of IndexOutOfBoundException.  It's not compatible with RI.
> Do you think so?
>
> Thanks!
>
>
> Thanks, Vladimir
> >
> >
> > On 7/21/06, Andrew Zhang <zhanghuangzhu@gmail.com> wrote:
> > >
> > > Hi Vladimir,
> > >
> > > I noticed the same problem is existing in many places of NIO module.
> > >
> > > How about writing a utility function for array index exception check?
> > > like:
> > >
> > > void assertArrayIndex(Object[] array, int offset, int length){
> > > if(offset < 0 || length < 0 || (long)offset + (long)length >
> > array.length
> > > ){
> > >     throw new IndexOutOfBoundsException();
> > > }
> > > }
> > >
> > > How do you think about it? Any suggestions?
> > >
> > > Thanks!
> > > Best regards,
> > >
> > >
> > > On 7/21/06, Paulex Yang (JIRA) <jira@apache.org> wrote:
> > > >
> > > >     [ http://issues.apache.org/jira/browse/HARMONY-932?page=all ]
> > > >
> > > > Paulex Yang closed HARMONY-932.
> > > > -------------------------------
> > > >
> > > >    Estimated Complexity: Novice
> > > >
> > > > Verified by Vladimir.
> > > >
> > > > > [classlib][nio]java.nio.?hannel.DatagramChannel.read(ByteBuffer[]
> ,
> > > int,
> > > > Integer.MAX_VALUE) throws NotYetConnectedException while RI throws
> > > > IndexOutOfBoundsException
> > > > >
> > > >
> > >
> >
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > > >
> > > > >                 Key: HARMONY-932
> > > > >                 URL:
> > http://issues.apache.org/jira/browse/HARMONY-932
> > > > >             Project: Harmony
> > > > >          Issue Type: Bug
> > > > >          Components: Classlib
> > > > >            Reporter: Vladimir Ivanov
> > > > >         Assigned To: Paulex Yang
> > > > >         Attachments: DatagramChannelImpl.patch
> > > > >
> > > > >
> > > > > The Harmony methods java.nio.?hannel.DatagramChannel.read/write
> > > (ByteBuffer[]
> > > > , int, Integer.MAX_VALUE) throws NotYetConnectedException while RI
> > > throws
> > > > IndexOutOfBoundsException.
> > > > > ==================== test.java ======================
> > > > > import java.nio.channels.*;
> > > > > import java.nio.*;
> > > > > public class test  {
> > > > >     public static void main (String[] args) {
> > > > >         try {
> > > > >             DatagramChannel.open().read(new ByteBuffer[] {}, 2,
> > > > Integer.MAX_VALUE);
> > > > >         } catch (Exception e) {
> > > > >             e.printStackTrace();
> > > > >         }
> > > > >         try {
> > > > >             DatagramChannel.open().write(new ByteBuffer[] {}, 2,
> > > > Integer.MAX_VALUE);
> > > > >         } catch (Exception e) {
> > > > >             e.printStackTrace();
> > > > >         }
> > > > >     }
> > > > > }
> > > > > =================================================
> > > > > Output:
> > > > > C:\tmp\tmp17>C:\jdk1.5.0_06\bin\java.exe -cp . -showversion test
> > > > > java version "1.5.0_06"
> > > > > Java(TM) 2 Runtime Environment, Standard Edition (build
> 1.5.0_06-b05
> > )
> > > > > Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode)
> > > > > java.lang.IndexOutOfBoundsException
> > > > >         at sun.nio.ch.DatagramChannelImpl.read(
> > > DatagramChannelImpl.java
> > > > :366)
> > > > >         at test.main(test.java:8)
> > > > > java.lang.IndexOutOfBoundsException
> > > > >         at sun.nio.ch.DatagramChannelImpl.write(
> > > DatagramChannelImpl.java
> > > > :429)
> > > > >         at test.main(test.java:13)
> > > > > C:\tmp\tmp17>C:\jrockit-jdk1.5.0-windows-ia32\bin\java.exe -cp
.
> > > > -showversion test
> > > > > java version "1.5.0"
> > > > > Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
> > > > > BEA WebLogic JRockit(R) (build dra-38972-20041208-2001-win-ia32,
> > > > R25.0.0-75, GC: System optimized over throughput (initial strategy
> > > > singleparpar))
> > > > > OutOfMemoryError
> > > > > -------end of stacktrace
> > > > > C:\tmp\tmp17>C:\harmony\trunk_0427\deploy\jdk\jre\bin\java.exe
-cp
> .
> > > > -showversion test
> > > > > java version 1.5 (subset)
> > > > > (c) Copyright 1991, 2006 The Apache Software Foundation or its
> > > > licensors, as applicable.
> > > > > java.nio.channels.NotYetConnectedException
> > > > >         at
> > > >
> org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected
> > (
> > > > DatagramChannelImpl.java:567)
> > > > >         at
> org.apache.harmony.nio.internal.DatagramChannelImpl.read(
> > > > DatagramChannelImpl.java:387)
> > > > >         at test.main(test.java:8)
> > > > > java.nio.channels.NotYetConnectedException
> > > > >         at
> > > >
> org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected
> > (
> > > > DatagramChannelImpl.java:567)
> > > > >         at
> org.apache.harmony.nio.internal.DatagramChannelImpl.write
> > (
> > > > DatagramChannelImpl.java:477)
> > > > >         at test.main(test.java:13)
> > > > >
> > > >
> > >
> >
> C:\tmp\tmp17>C:\harmony\drlvm\trunk\build\win_ia32_msvc_debug\deploy\jre\bin\ij
> > > > -Dvm.assert_dialog=false -cp . -showversion test
> > > > > Apache Harmony DRLVM HEAD-4807 (2006-05-02), Windows/ia32/msvc
> 1310,
> > > > debug
> > > > > java.nio.channels.NotYetConnectedException
> > > > >         at
> > > >
> org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected
> > (
> > > > DatagramChannelImpl.java:567)
> > > > >         at
> org.apache.harmony.nio.internal.DatagramChannelImpl.read(
> > > > DatagramChannelImpl.java:387)
> > > > >         at test.main(test.java:8)
> > > > > java.nio.channels.NotYetConnectedException
> > > > >         at
> > > >
> org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected
> > (
> > > > DatagramChannelImpl.java:567)
> > > > >         at
> org.apache.harmony.nio.internal.DatagramChannelImpl.write
> > (
> > > > DatagramChannelImpl.java:477)
> > > > >         at test.main(test.java:13)
> > > >
> > > > --
> > > > This message is automatically generated by JIRA.
> > > > -
> > > > If you think it was sent incorrectly contact one of the
> > administrators:
> > > > http://issues.apache.org/jira/secure/Administrators.jspa
> > > > -
> > > > For more information on JIRA, see:
> > > http://www.atlassian.com/software/jira
> > > >
> > > >
> > > >
> > >
> > >
> > > --
> > > Andrew Zhang
> > > China Software Development Lab, IBM
> > >
> > >
> >
> >
>
>
> --
> Andrew Zhang
> China Software Development Lab, IBM
>
>

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