Example usage for org.apache.lucene.search.highlight Highlighter Highlighter

Introduction

In this page you can find the example usage for org.apache.lucene.search.highlight Highlighter Highlighter.

Prototype

public Highlighter(Scorer fragmentScorer) 

Source Link

Usage

From source file:org.paxle.se.index.lucene.impl.SnippetFetcher.java

License:Open Source License

public String getSnippet(Query query, String locationStr) {
    Reader textReader = null;//from   www.  ja  va 2s . c o  m
    try {
        // creating a dummy command
        URI locationURI = URI.create(locationStr);
        ICommand cmd = this.docFactory.createDocument(ICommand.class);
        cmd.setLocation(locationURI);

        // crawling the resource
        this.crawler.process(cmd);
        if (cmd.getResult() != Result.Passed)
            return null;

        // parsing the resource
        this.parser.process(cmd);
        if (cmd.getResult() != Result.Passed)
            return null;

        // trying to get the parsed content
        IParserDocument pdoc = cmd.getParserDocument();
        if (pdoc == null)
            return null;
        else if (pdoc.getStatus() != Status.OK)
            return null;

        // getting the document content
        textReader = pdoc.getTextAsReader();
        if (textReader == null)
            return null;

        // reading some text
        StringBuilder text = new StringBuilder();
        this.ioTools.copy(textReader, text, 10240);

        final Highlighter highlighter = new Highlighter(new QueryScorer(query));
        final TokenStream tokenStream = this.analyzer.tokenStream("content", new StringReader(text.toString()));
        final String result = highlighter.getBestFragments(tokenStream, text.toString(), 3, "...");

        return result;
    } catch (Throwable e) {
        this.logger.error(e.getMessage(), e);
    } finally {
        // closing reader
        if (textReader != null) {
            try {
                textReader.close();
            } catch (Exception e) {
                this.logger.error(e.getMessage(), e);
            }
        }
    }

    return null;
}

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From source file:persistence.lucene.search.QueryExecutorHelper.java

License:Open Source License

List<QueryResult> queryDocuments(final String query, final String[] fields, final String user)
        throws ParseException, IOException, InvalidTokenOffsetsException {
    int hitsPerPage = 10;
    MultiFieldQueryParser queryParser = new MultiFieldQueryParser(fields, new StandardAnalyzer());

    Query luceneQuery = queryParser.parse(query);
    Highlighter highlighter = new Highlighter(new QueryScorer(luceneQuery));

    DirectoryReader indexReader = DirectoryReader.open(directory);
    IndexSearcher searcher = new IndexSearcher(indexReader);

    TopScoreDocCollector collector = TopScoreDocCollector.create(hitsPerPage, true);
    TermsFilter filter = new TermsFilter(new Term(FullTextSearchResource.DOCUMENT_OWNER, user.toLowerCase()));
    searcher.search(luceneQuery, filter, collector);

    ScoreDoc[] docs = collector.topDocs().scoreDocs;
    List<QueryResult> resultBeans = new ArrayList<>(docs.length);
    for (ScoreDoc doc : docs) {
        Document document = searcher.doc(doc.doc);
        String text = document.get(FullTextSearchResource.DOCUMENT_CONTENT_FIELD);
        TokenStream tokenStream = TokenSources.getAnyTokenStream(searcher.getIndexReader(), doc.doc,
                FullTextSearchResource.DOCUMENT_CONTENT_FIELD, standardAnalyzer);
        TextFragment[] fragments = highlighter.getBestTextFragments(tokenStream, text, false, 10);

        resultBeans.add(new QueryResult(doc.doc, doc.score, document, fragments));
    }/*from   w w  w .j a v  a 2  s  .c o  m*/

    indexReader.close();
    return resultBeans;
}

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