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From syedfa <fayyazud...@gmail.com>
Subject Highlighting results returned from MultiFieldQueryParser
Date Wed, 30 Jul 2008 13:54:00 GMT

Dear fellow Lucene/Java developers:

I have an index created from an XML file which I am trying to search using
the MultiFieldQueryParser.  At present, I am using the QueryParser to
successfully return results that are highlighted.  The code is listed here:

public List search(File indexDir, String q) throws Exception { 
          
        List searchResult = new ArrayList(); 
        Directory fsDir=FSDirectory.getDirectory(indexDir); 
        IndexSearcher is=new IndexSearcher(fsDir); 
        
        Analyzer analyser = new StandardAnalyzer(); 
        Query parser=new QueryParser("LINES", analyser).parse(q); 
        long start=new Date().getTime(); 
        Hits hits=is.search(parser); 
        long end=new Date().getTime(); 
        QueryScorer scorer = new QueryScorer(parser); 
        SimpleHTMLFormatter formatter = new SimpleHTMLFormatter("", ""); 
        Highlighter highlighter = new Highlighter(formatter, scorer); 
        Highlighter high = new Highlighter(formatter, scorer); 
        Fragmenter fragmenter = new NullFragmenter(); 
        Fragmenter fragment = new SimpleFragmenter(250); 
        highlighter.setTextFragmenter(fragmenter); 
        high.setTextFragmenter(fragment); 
    
        for(int i=0; i<hits.length(); i++){ 
             Document doc=hits.doc(i); 
             String lns = doc.get("LINES"); 
             TokenStream lines = analyser.tokenStream("LINES", new
StringReader(lns)); 
             CachingTokenFilter filter = new CachingTokenFilter(lines); 
             String highlightedLines = highlighter.getBestFragment(filter,
lns); 
             filter.reset(); 
             String highlight = high.getBestFragment(filter, lns); 
             SearchResult resultBean = new SearchResult(); 
             resultBean.setReference(hits.doc(i).get("REFERENCE")); 
             resultBean.setNarrator(hits.doc(i).get("SPEAKER")); 
             resultBean.setHitResult(highlight); 
             resultBean.setQuote(highlightedLines); 
             searchResult.add(resultBean); 
             System.out.println(resultBean.getReference()); 
             System.out.println(resultBean.getNarrator()); 
             System.out.println(resultBean.getHitResult()); 
             System.out.println(""); 
             System.out.println(resultBean.getQuote()); 
             System.out.println(""); 
        } 
        
        System.err.println("Found " + hits.length() + " document(s)(in " +
(end-start) + " milliseconds) that matched query '" + q + "':"); 
        
        return searchResult;         
    } 

Currently, I have an XML element which I am searching called <LINES>.  Using
the MultiFieldQueryParser, I want the user to be able to search the <LINES>
and <SCENE-COMMENTARY> elements.  The results found within the
<SCENE-COMMENTARY> element I wish to store in a separate javaBean object
that has only two attributes, get/setResult and get/setReference, and wish
to present the results to the user in order of best match (which is what it
is doing at present).  How would I achieve the same results when I am using
the MultiFieldQueryParser class?  Would I do anything different when trying
to return highlighted results from a wildcard search or a fuzzy search?

Thanks to everyone who replies.
Sincerely;
Fayyaz
-- 
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