[Advanced-java] Inheritation of InputStream crashs BufferedReader

[Marco Ferretti]

On Thursday 27 April 2006 18:05, Peter Rader wrote:
> Hi Folks,
>
> i do not often post to this list, but this time i need your help.
>
> My java decompiler show me the sourcecode of InputStream, so i see
> that i only have to override the method "int read()" and "int available()"
> and his constructor?! Right?
>
For what I may see ... yes

> I do so and convert my inputstream to BufferedReader this way:
>
> BufferedReader myreader = new BufferedReader(new
> InputStreamReader(myInheritOfInputstream));
>
> Everything works fine, until my InputStream got no more data.
>
> "myreader.ready()" is true while my InputStream's methode "available()"
> returns 0.
>
> So what do i have to do, to inform the BufferedReader that there is no
> more data?

Actually, the BufferedReader.ready() method : 
return (nextChar < nChars) || in.ready();

in your case you have to check that . If in.ready is called, then the internal 
Reader.ready() is called ( in your case InputStreamReader.ready() )  which 
returns StreamDecoder.ready() .  Now, StramDecoder is 
sun.nio.cs.StreamDecoder which means that it does something dependent on the 
system. What it looks like is that wither the buffer is somehow 
"dirty" ( there's something else to be passed on ) or the StramDecoder sees 
more data . 
Unfortunately, my knowlegde ends here  (it would have been nice 2 have the 
sources of the nio classes ....) .


hope it helps .


-- 
You should go home.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
Url : /lists/advanced-java/attachments/20060427/3cd82441/attachment.bin