Thank you for your comments!
Two questions regarding Roberts sample:
1. This sample will work only for UTF8 strings, right?
2. Is it worth to insert it in the Mina project?!
I tried another way for the first part. I used
<code>
char[] buf = in.asCharBuffer().array();
</code>
Unfortunately an UnsupportedOperationException was thrown :(
This happens, when the underlying array is null (not heap allocated).
Regards
Michael
[EMAIL PROTECTED] wrote:
One thing we found with string parsing is that if you know your string
is purely ASCII it is *much much* faster to grab the string as a byte
array, cast each element to a char array and construct the String from
that. The charset decoders have a significant overhead.
For example:
byte[] stringBytes = new byte[length];
buffer.get(stringBytes, 0, length);
char[] stringChars = new char[length];
for (int i = 0; i < stringChars.length; i++)
{
stringChars[i] = (char) stringBytes[i];
}
return new String(stringChars);
Although it looks a bit cumbersome it is five times faster (from my
measurements) than constructing the String directly from a byte array.
Robert
*"Trustin Lee" <[EMAIL PROTECTED]>*
13/04/2006 08:47
Please respond to mina-dev
To: [email protected]
cc:
Subject: Re: converting ASCII represented longs from
ByteBuffer to simple data type?
On 4/13/06, Michael Bauroth <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> has somebody a short code snippet, how I can convert an ASCII span,
> which represents a long (e.g. 1234) from ByteBuffer to the simple java
> type long most efficiently (minimum of new object generation / buffer
> copies ...)
For now, you have to use ByteBuffer.getString() and then parse it using
Integer.parseInt(). It's not optimal but works fine. :)
Trustin
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