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From "Sam Halliday (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4284) RFE: stopword filter without lowercase side-effect
Date Thu, 02 Aug 2012 14:43:02 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427353#comment-13427353
] 

Sam Halliday commented on LUCENE-4284:
--------------------------------------

OK, thanks. Actually all I needed was to remove stop words from a String, so the following
did the trick

{noformat}
            Set<Object> stops = StopFilter.makeStopSet(Version.LUCENE_36, Lists.newArrayList(StopAnalyzer.ENGLISH_STOP_WORDS_SET),
true);
            Tokenizer tokeniser = new ClassicTokenizer(Version.LUCENE_36, new StringReader(text));
            StopFilter stopFilter = new StopFilter(Version.LUCENE_36, tokeniser, stops);

            List<String> words = Lists.newArrayList();
            try {
                while (stopFilter.incrementToken()) {
                    String token = stopFilter.getAttribute(CharTermAttribute.class).toString();
                    words.add(token);
                }
            } catch (IOException ex) {
                throw new GuruMeditationFailure();
            }
{noformat}

The API is a bit of a labyrinth - it'll take me some time to understand many of the design
decisions.
                
> RFE: stopword filter without lowercase side-effect
> --------------------------------------------------
>
>                 Key: LUCENE-4284
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4284
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Sam Halliday
>            Priority: Minor
>
> It would appear that accept()-time lowercasing of Tokens is not favourable anymore, due
to the @Deprecation of the only constructor in StopFilter that allows this.
> Please support some way to allow stop-word removal without lowercasing the output:
>   http://stackoverflow.com/questions/11777785

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