I have been working on extending the Highlighter with a new Scorer that
correctly scores phrase and span queries. The highlighter is working
great for me, but could really use some more banging on.
If you have a need or an interest in a more accurate Highlighter, please
give it a whirl and let me know how it went. Unlike most of the other
alternate Lucene Highlighters, this one builds off the original contrib
Highlighter so as to retain all of its goodness.
http://myhardshadow.com/qsolreleases/lucene-highlighter-2.2.jar
Example Usage
IndexSearcher searcher = new IndexSearcher(ramDir);
Query query = QueryParser.parse("Kenne*", FIELD_NAME, analyzer);
query = query.rewrite(reader); //required to expand search terms
Hits hits = searcher.search(query);
for (int i = 0; i < hits.length(); i++)
{
String text = hits.doc(i).get(FIELD_NAME);
CachingTokenFilter tokenStream = new
CachingTokenFilter(analyzer.tokenStream(
FIELD_NAME, new StringReader(text)));
Highlighter highlighter = new Highlighter(new SpanScorer(query,
FIELD_NAME, tokenStream));
tokenStream.reset();
// Get 3 best fragments and seperate with a "..."
String result = highlighter.getBestFragments(tokenStream, text,
3, "...");
System.out.println(result);
}
If you make a call to any of the getBestFragments() methods more than
once, you must call reset() on the SpanScorer between each call.
Pass null as the FIELD_NAME to ignore fields.
If you want to Highlight the whole document, use a NullFragmenter.
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