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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-627) highlighter problems with overlapping tokens
Date Thu, 13 Jul 2006 20:05:35 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-627?page=comments#action_12420919 ] 

Yonik Seeley commented on LUCENE-627:
-------------------------------------

OK, here we go... the following test fails with
Expected :ipod <B>foo</B>
Actual  :iiPod <B>foo</B>


  public void testOverlapAnalyzer2() throws Exception
  {

    String s = "iPod foo";
    // the token stream for the string above:
    TokenStream ts = new TokenStream() {
      Iterator iter;
      {
        List lst = new ArrayList();
        Token t;
        t = new Token("i",0,1);
        lst.add(t);
        t = new Token("pod",1,4);
        t.setPositionIncrement(0);
        lst.add(t);
        t = new Token("ipod",0,4);
        lst.add(t);
        t = new Token("foo",5,8);
        lst.add(t);
        iter = lst.iterator();
      }
      public Token next() throws IOException {
        return iter.hasNext() ? (Token)iter.next() : null;
      }
    };

    String srchkey = "foo";

    QueryParser parser=new QueryParser("text",new WhitespaceAnalyzer());
    Query query = parser.parse(srchkey);

    Highlighter highlighter = new Highlighter(new QueryScorer(query));

// Get 3 best fragments and seperate with a "..."
    String result = highlighter.getBestFragments(ts, s, 3, "...");
    String expectedResult="ipod <B>foo</B>";
    assertEquals(expectedResult,result);
  }

> highlighter problems with overlapping tokens
> --------------------------------------------
>
>          Key: LUCENE-627
>          URL: http://issues.apache.org/jira/browse/LUCENE-627
>      Project: Lucene - Java
>         Type: Bug

>   Components: Other
>     Versions: 2.0.1
>     Reporter: Yonik Seeley

>
> The lucene highlighter has problems when tokens that overlap are generated.
> For example, if analysis of iPod generates the tokens "i", "pod", "ipod" (with pod and
ipod in the same position),
> then the highlighter will output this as iipod, regardless of if any of those tokens
are highlighted.
> Discovered via http://issues.apache.org/jira/browse/SOLR-24

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