Rewrite of EUC_TW

[Xueming Shen]

Thanks again for taking time on this. Here is the IBM db charsets webrev

http://cr.openjdk.java.net/~sherman/ibmdb/webrev

This is a bigger fish than the EUC_TW:-)

If you really want to see the performance difference, simply drop the 
EUC_TW.java, EUC_TWMapping.java
(I sent to you last time) into your ws/respository and build, or simply 
remove the package head and use a null
for the alias list in the construct,  and then run the TestEUC_TW.java 
against them.

Sherman


Ulf Zibis wrote:
>
>
> Regrettably I can't compare your results against the results from day 
> before (without the tweaks suggested from my side), as it seems you 
> have used different algorithm. :-(
>
> -Ulf
>
>
>> I simply ran the test case TestEUC_TW attached in the test case, set 
>> the iteration set to 200, run with
>> BMP characters only, supplementary characters only and mixed.
>>
>> http://cr.openjdk.java.net/~sherman/6831794_6229811/webrev/test/sun/nio/cs/TestEUC_TW.java.html 
>>
>>
>> Though this is not a real benchmark, the data does say something.
>>
>> BMP -client:
>>    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 14178,3350 :4.232239
>>    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 5061,3538 :1.430469
>>    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 17917,7431 :2.411116
>>    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 7966,6859 :1.161394
>>
>> SUPP -client
>>    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 72054,7165 :10.056385
>>    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 7912,5550 :1.425586
>>    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 78578,12924 :6.080006
>>    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 13198,11483 :1.149351
>>
>> Mixed -client
>>    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 73012,7499 :9.736231
>>    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 7952,5549 :1.433051
>>    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 77963,13116 :5.944114
>>    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 13139,11727 :1.120406
>>
>> BMP -server:
>>    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 13164,3479 :3.783846
>>    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 4703,2304 :2.041233
>>    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 13758,3572 :3.851624
>>    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 5370,3421 :1.569716
>>
>> SUPP -server
>>    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 67307,5540 :12.149278
>>    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 5825,4434 :1.313712
>>    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 68738,5710 :12.038179
>>    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 5980,4104 :1.457115
>>
>> Mixed -server
>>    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 67568,5465 :12.363769
>>    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 6323,4421 :1.430219
>>    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 68766,5767 :11.924051
>>    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 5637,4040 :1.395297
>>
>>
>