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From Allahbaksh Mohammedali Asadullah <Allahbaksh_Asadul...@infosys.com>
Subject RE: Integer2String Covnersation
Date Wed, 11 Mar 2009 14:25:34 GMT

Hi,
I didn't get what exactly does shifiting 24 times and shifing 12 times does. Is there any
Character at that value or is there some differenciator?
Can some one go in bit details.
Regards.

 
 

-----Original Message-----
From: yseeley@gmail.com [mailto:yseeley@gmail.com] On Behalf Of Yonik Seeley
Sent: Wednesday, March 11, 2009 7:35 PM
To: java-user@lucene.apache.org
Subject: Re: Integer2String Covnersation

On Wed, Mar 11, 2009 at 9:54 AM, Allahbaksh Mohammedali Asadullah
<Allahbaksh_Asadullah@infosys.com> wrote:
> Hi all,
> Can any one explain How function integer2String works.
>
>  public static int int2sortableStr(int val, char[] out, int offset) {
>
>    val += Integer.MIN_VALUE;

This maps MIN_VALUE to 0 and MAX_VALUE to 0xffffffff, making the bits
sort lexicographically the same as the full integer range.  It's the
same as flipping the sign bit.

>    out[offset++] = (char)(val >>> 24);
>    out[offset++] = (char)((val >>> 12) & 0x0fff);
>    out[offset++] = (char)(val & 0x0fff);

This chops up the bits to fit in char sized pieces to make a string,
avoiding invalid character ranges.

-Yonik
http://www.lucidimagination.com

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