StandardCharset vs. StandardCharsets
forax at univ-mlv.fr
Sat May 7 16:00:36 UTC 2011
On 05/07/2011 02:17 PM, Ulf Zibis wrote:
> Hi all,
> please excuse, that I have still problems to accept this additional
> class, but +1 for the plural name.
> If those charset constants are there, people _will use_ them without
> respect on the existing _performance disadvantages_.
> A common typical use case should be: String.getBytes(...)
> On small strings there is a performance lost up to 25 % using the
> charset variant vs. the charset name variant. See:
> So I still think, we should have the standard charset names as
> constants in class j.n.c.Charset:
> public static final String UTF_8 = "UTF-8"; etc...
Using objects instead of string is a better design.
I see the fact that the String method variants that takes a Charset are
slower that the ones that use a String
as a performance bug, not as a design issue.
The String method that takes a Charset should reuse the class-local decoder
and the performance problem will go away.
(The analysis in StringCoding.decode(Charset, ...) (point 1) forget that
initializing a decoder has also a cost)
PS: also the else part of if(c instanceof ArrayDecoder) should be in a
side method to ease
the inlining of decode().
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