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From "Marc Pompl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CODEC-107) Enhance documentation for Language Encoders
Date Sun, 10 Apr 2011 22:11:05 GMT

    [ https://issues.apache.org/jira/browse/CODEC-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018163#comment-13018163
] 

Marc Pompl commented on CODEC-107:
----------------------------------

Hi Gary,

I am glad to see the documentation has been improvd. Thanks! :-)

(Just confused that this JIRA has been marked as "won't be fixed".)

> Enhance documentation for Language Encoders
> -------------------------------------------
>
>                 Key: CODEC-107
>                 URL: https://issues.apache.org/jira/browse/CODEC-107
>             Project: Commons Codec
>          Issue Type: Improvement
>    Affects Versions: 1.4
>            Reporter: Marc Pompl
>            Priority: Minor
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> The current userguide (http://commons.apache.org/codec/userguide.html) just lists four
Language Encoders, but there are five at the moment. CODEC-106 implements a sixth one.
> Would be a good idea, to complete documentation.
> Additionally, I suggest to extent the userguide in order to show a simple performance
measurement:
> _SNIP_
> org.apache.commons.codec.language.Metaphone encodings per msec: 327
> org.apache.commons.codec.language.DoubleMetaphone encodings per msec: 224
> org.apache.commons.codec.language.Soundex encodings per msec: 904
> org.apache.commons.codec.language.RefinedSoundex encodings per msec: 637
> org.apache.commons.codec.language.Caverphone encodings per msec: 5
> org.apache.commons.codec.language.ColognePhonetic encodings per msec: 289
> So, Soundex is the fastest encoder. Caverphone is much slower than any other algorithm.
All others show off nearly the same performance.
> Checked with the following code:
> {code:java}
>   private static final int REPEATS = 1000000;
>   public void checkSpeed() throws Exception {
> 	  checkSpeedEncoding(new Metaphone(), "easgasg", REPEATS);
> 	  checkSpeedEncoding(new DoubleMetaphone(), "easgasg", REPEATS);
> 	  checkSpeedEncoding(new Soundex(), "easgasg", REPEATS);
> 	  checkSpeedEncoding(new RefinedSoundex(), "easgasg", REPEATS);
> 	  checkSpeedEncoding(new Caverphone(), "Carlene", 100000);
> 	  checkSpeedEncoding(new ColognePhonetic(), "Schmitt", REPEATS);
>   }
>   
>   private void checkSpeedEncoding(Encoder encoder, String toBeEncoded, int repeats) throws
Exception {
> 	  long start = System.currentTimeMillis();
> 	  for ( int i=0; i<repeats; i++) {
> 		    encoder.encode(toBeEncoded);
> 	  }
> 	  long duration = System.currentTimeMillis()-start;
> 	  System.out.println(encoder.getClass().getName() + " encodings per msec: "+(repeats/duration));
>   }
> {code}
> _SNAP_

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