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https://issues.apache.org/jira/browse/LUCENE-1522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Sekiguchi updated LUCENE-1522:
-----------------------------------
Attachment: LUCENE-1522.patch
to apply this patch, LUCENE-1448 also need to be applied.
{code}
$ svn co -r713975 http://svn.apache.org/repos/asf/lucene/java/trunk
$ cd trunk
$ patch -p0 < LUCENE-1448.patch
$ patch -p0 < LUCENE-1522.patch
{code}
> another highlighter
> -------------------
>
> Key: LUCENE-1522
> URL: https://issues.apache.org/jira/browse/LUCENE-1522
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/highlighter
> Reporter: Koji Sekiguchi
> Priority: Minor
> Attachments: LUCENE-1522.patch
>
>
> I've written this highlighter for my project to support bi-gram token stream.
> The idea was inherited from my previous project with my colleague and
> LUCENE-644. This approach needs highlight fields to be
> TermVector.WITH_POSITIONS_OFFSETS, but is fast and can support N-grams. This
> depends on LUCENE-1448 to get refined term offsets.
> usage:
> {code:java}
> Highlighter h = new Highlighter();
> FieldQuery fq = h.getFieldQuery( query );
> // docId=0, fieldName="content", fragCharSize=100, numFragments=3
> String[] fragments = h.getBestFragments( fq, reader, 0, "content", 100, 3 );
> {code}
> features:
> - fast for large docs
> - supports "fixed size" N-gram (e.g. (2,2), not (1,3)) (can solve LUCENE-1489)
> - supports PhraseQuery, phrase-unit highlighting with slops
> {noformat}
> q="w1 w2"
> <b>w1 w2</b>
> ---------------
> q="w1 w2"~1
> <b>w1</b> w3 <b>w2</b> w3 <b>w1 w2</b>
> {noformat}
> - highlight fields need to be TermVector.WITH_POSITIONS_OFFSETS
> - easy to apply patch due to independent package (contrib/highlighter2)
> - uses Java 1.5
> - looks query boost to score fragments (currently doesn't see idf, but it
> should be possible)
> - pluggable FragListBuilder
> - pluggable FragmentsBuilder
> to do:
> - term positions can be unnecessary when phraseHighlight==false
> - collects performance numbers
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