harmony-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andrew Zhang" <zhanghuang...@gmail.com>
Subject Re: [classlib][luni][charset]Strange behavior of UnicodeBig
Date Thu, 19 Oct 2006 10:24:38 GMT
On 10/19/06, Tony Wu <wuyuehao@gmail.com> wrote:
>
> I think to support UnicodeBig in nio is not a bug but a feature. And
> the key point is how can I get UnicodeBig supportted in IO/Lang?


If ICU/NIO supports "UnicodeBig", wouldn't IO/LANG support "UnicodeBig"  as
well?

On 10/19/06, Andrew Zhang <zhanghuangzhu@gmail.com> wrote:
> > On 10/19/06, Tony Wu <wuyuehao@gmail.com> wrote:
> > >
> > > The implemetion is from ICU, so, I think we'd better not to wrap it by
> > > ourselves. I'll post to ICU mailing list and ask if they can help to
> > > supply these legacy charsets.
> >
> >
> > Hey Tony, please keep in mind that following code[1] should print false
> and
> > throw an UnsupportedCharsetException. If ICU provides "UnicodeBig"
> support,
> > does it mean harmony nio also support "UnicodeBig"?
> >
> > [1]
> > System.out.println(Charset.isSupported("UnicodeBig"));
> > Charset.forName("UncodeBig");
> >
> > On 10/19/06, Andrew Zhang <zhanghuangzhu@gmail.com> wrote:
> > > > On 10/19/06, Tony Wu <wuyuehao@gmail.com> wrote:
> > > > >
> > > > > Thank you all,
> > > > > It is not just an issue about name.
> > > > > The precondition of mapping is that ICU has really supported this
> > > > > charset. AFAIK UnicodeBig is not implemented by ICU, refer to [1].
> > > > > Shall we map the UnicodeBit&UnicodeLittle to UTF-16 as work
> around[2]?
> > > >
> > > >
> > > > No, I don't think so. The only difference between "UnicodeBig" and
> > > > "UTF-16BE" is with/without byte-order mark. So it should be easy to
> wrap
> > > > "UTF-16BE"  as "UnicodeBig" for java.io/java.lang. Just put 0xFE
> 0xFF at
> > > the
> > > > begining of the bytes and then encode the buffer as "UTF-16BE". Do I
> > > miss
> > > > something?
> > > >
> > > > [1]http://dev.icu-
> > > > >
> > >
> project.org/cgi-bin/viewcvs.cgi/icu/source/data/mappings/convrtrs.txt?view=co
> > > > >
> > > > > [2]
> > > > > UTF-16
> > > > > Sixteen-bit UCS Transformation Format, byte order identified by an
> > > > > optional byte-order mark
> > > > > UnicodeBig
> > > > > Sixteen-bit Unicode Transformation Format, big-endian byte order,
> > > > > with byte-order mark
> > > > > UnicodeLittle
> > > > > Sixteen-bit Unicode Transformation Format, little-endian byte
> order,
> > > > > with byte-order mark
> > > > >
> > > > > On 10/17/06, Paulex Yang <paulex.yang@gmail.com> wrote:
> > > > > > Tony Wu wrote:
> > > > > > > Thank you Andrew,
> > > > > > > I think I got the point. The j.l.String of RI uses the
> encoding of
> > > IO
> > > > > > > whereas Charset.forName use another of NIO.
> > > > > > >
> > > > > > > And the new problem is shall we follow the spec[1] to support
> the
> > > two
> > > > > > > suites of charset implemetation? I just have a look and
find
> we
> > > does
> > > > > > > not support some Canonical Name for java.io and java.lang
API
> such
> > > as
> > > > > > >
> > > UnicodeBigUnmarked,UnicodeLittleUnmarked,UnicodeBig,Unicodelittle,etc.
> > > > > > There is such a charset name mapping in InputStreamReader, I
> think
> > > we
> > > > > > have no choice but to support these legacy charset names, you
> may
> > > need
> > > > > > some refactory work to make these classes use the same mapping
> data.
> > > > > > >
> > > > > > > [1]
> > > http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html
> > > > > > >
> > > > > > > On 10/17/06, Andrew Zhang <zhanghuangzhu@gmail.com>
wrote:
> > > > > > >> On 10/17/06, Andrew Zhang <zhanghuangzhu@gmail.com>
wrote:
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> > On 10/17/06, Leo Li <liyilei1979@gmail.com>
wrote:
> > > > > > >> > >
> > > > > > >> > > I think Harmony is more reasonable.
> > > > > > >> > >
> > > > > > >> > > As spec says, if  Charset.forName("UnicodeBig")
throws
> > > > > > >> > > .UnsupportedCharsetException then no support
for the
> named
> > > > > > >> charset is
> > > > > > >> > > available in this instance of the Java virtual
machine.
> Then
> > > how
> > > > > > >> can we
> > > > > > >> > > get
> > > > > > >> > > new String(b, "UnicodeBig") without throwing
> > > > > > >> UnsupportedCharsetException
> > > > > > >> > > on
> > > > > > >> > > the same jvm? The spec for String(byte[]
bytes,String
> > > > > > >> charsetName) also
> > > > > > >> > > says
> > > > > > >> > > if the named charset is not supported,
> > > > > UnsupportedCharsetException
> > > > > > >> > > should be
> > > > > > >> > > thrown out.
> > > > > > >> >
> > > > > > >> >
> > > > > > >> > UNICODEBIG is a java alias for UTF-16BE. I think
we'd
> better
> > > > > > >> support such
> > > > > > >> > mapping in String and follow RI.
> > > > > > >> >
> > > > > > >>
> > > > > > >> You can find the encoding set from spec. [1]
> > > > > > >>
> > > > > > >> [1]
> > > http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html
> > > > > > >>
> > > > > > >>  On 10/17/06, Tony Wu <wuyuehao@gmail.com> wrote:
> > > > > > >> > > >
> > > > > > >> > > > Hi all,
> > > > > > >> > > > I found this when I tried to debug the
failure tests of
> ant
> > > on
> > > > > > >> > > > harmony. Note the output of testcases
below.
> > > > > > >> > > >
> > > > > > >> > > > import java.io.UnsupportedEncodingException;
> > > > > > >> > > > import java.nio.charset.Charset ;
> > > > > > >> > > > import junit.framework.TestCase;
> > > > > > >> > > >
> > > > > > >> > > > public class TestCharset extends TestCase
{
> > > > > > >> > > >    public void test1() throws
> UnsupportedEncodingException
> > > {
> > > > > > >> > > >        byte[] b = new byte[] { 'a',
'b', 'c' };
> > > > > > >> > > >        String s = new String(b, "UnicodeBig");
> > > > > > >> > > >        assertEquals("abc", s);
> > > > > > >> > > >    }
> > > > > > >> > > >
> > > > > > >> > > >    public void test2() {
> > > > > > >> > > >        Charset.forName("UnicodeBig");
> > > > > > >> > > >    }
> > > > > > >> > > > }
> > > > > > >> > > >
> > > > > > >> > > > RI:
> > > > > > >> > > > test1: junit.framework.ComparisonFailure:
> expected:<abc>
> > > but
> > > > > > >> was:<>
> > > > > > >> > > > test2: java.nio.charset.UnsupportedCharsetException:
> > > UnicodeBig
> > > > > > >> > > >
> > > > > > >> > > > Harmony:
> > > > > > >> > > > test1:java.nio.charset.UnsupportedCharsetException:
> > > UnicodeBig
> > > > > > >> > > > test2:
> > > > > > >> > > > java.nio.charset.UnsupportedCharsetException:
The
> > > unsupported
> > > > > > >> charset
> > > > > > >> > > > name is "UnicodeBig"
> > > > > > >> > > >
> > > > > > >> > > > seems RI can recognize the *UnicodeBig*
in Constructor
> of
> > > > > > >> j.l.String,
> > > > > > >> > > > whereas Harmony does not support this
alias at all.
> > > > > > >> > > >
> > > > > > >> > > > Do you have any concern about that?
> > > > > > >> > > > --
> > > > > > >> > > > Tony Wu
> > > > > > >> > > > China Software Development Lab, IBM
> > > > > > >> > > >
> > > > > > >> > > >
> > > > > > >>
> > > ---------------------------------------------------------------------
> > > > > > >> > > > Terms of use :
> > > http://incubator.apache.org/harmony/mailing.html
> > > > > > >> > > > To unsubscribe, e-mail:
> > > > > > >> harmony-dev-unsubscribe@incubator.apache.org
> > > > > > >> > > > For additional commands, e-mail:
> > > > > > >> harmony-dev-help@incubator.apache.org
> > > > > > >> > > >
> > > > > > >> > > >
> > > > > > >> > >
> > > > > > >> > >
> > > > > > >> > > --
> > > > > > >> > > Leo Li
> > > > > > >> > > China Software Development Lab, IBM
> > > > > > >> > >
> > > > > > >> > >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> > --
> > > > > > >> > Best regards,
> > > > > > >> > Andrew Zhang
> > > > > > >>
> > > > > > >>
> > > > > > >>
> > > > > > >>
> > > > > > >> --
> > > > > > >> Best regards,
> > > > > > >> Andrew Zhang
> > > > > > >>
> > > > > > >>
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Paulex Yang
> > > > > > China Software Development Lab
> > > > > > IBM
> > > > > >
> > > > > >
> > > > > >
> > > ---------------------------------------------------------------------
> > > > > > Terms of use : http://incubator.apache.org/harmony/mailing.html
> > > > > > To unsubscribe, e-mail:
> harmony-dev-unsubscribe@incubator.apache.org
> > > > > > For additional commands, e-mail:
> > > harmony-dev-help@incubator.apache.org
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Tony Wu
> > > > > China Software Development Lab, IBM
> > > > >
> > > > >
> ---------------------------------------------------------------------
> > > > > Terms of use : http://incubator.apache.org/harmony/mailing.html
> > > > > To unsubscribe, e-mail:
> harmony-dev-unsubscribe@incubator.apache.org
> > > > > For additional commands, e-mail:
> harmony-dev-help@incubator.apache.org
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Best regards,
> > > > Andrew Zhang
> > > >
> > > >
> > >
> > >
> > > --
> > > Tony Wu
> > > China Software Development Lab, IBM
> > >
> > > ---------------------------------------------------------------------
> > > Terms of use : http://incubator.apache.org/harmony/mailing.html
> > > To unsubscribe, e-mail: harmony-dev-unsubscribe@incubator.apache.org
> > > For additional commands, e-mail: harmony-dev-help@incubator.apache.org
> > >
> > >
> >
> >
> > --
> > Best regards,
> > Andrew Zhang
> >
> >
>
>
> --
> Tony Wu
> China Software Development Lab, IBM
>
> ---------------------------------------------------------------------
> Terms of use : http://incubator.apache.org/harmony/mailing.html
> To unsubscribe, e-mail: harmony-dev-unsubscribe@incubator.apache.org
> For additional commands, e-mail: harmony-dev-help@incubator.apache.org
>
>


-- 
Best regards,
Andrew Zhang

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message