Java 类org.apache.lucene.search.highlight.QueryTermScorer 实例源码

@Override
public String highlight(String locale, boolean useStopWords, String query, String content, String pre, String post, int preview) {
    Analyzer analyzer = termAnalyzers.findAnalyzer(locale, useStopWords);
    QueryParser parser = new QueryParser(defaultField, analyzer);

    String summary = null;
    try {
        SimpleHTMLFormatter formatter = new SimpleHTMLFormatter(pre, post);
        Highlighter hg = new Highlighter(formatter, new QueryTermScorer(parser.parse(query)));
        hg.setMaxDocCharsToAnalyze(preview);
        hg.setTextFragmenter(new SimpleFragmenter(100));

        TokenStream tokens = TokenSources.getTokenStream(defaultField, content, analyzer);
        summary = hg.getBestFragments(tokens, content, 4, " ... ");
    } catch (InvalidTokenOffsetsException | IOException | ParseException ex) {
        LOG.error("Failed to highlight", ex);
    }

    return StringUtils.isBlank(summary) ? null : summary;
}

/**
 * Return a {@link org.apache.lucene.search.highlight.Scorer} suitable for this Query and field.
 * 
 * @param query
 *            The current query
 * @param fieldName
 *            The name of the field
 * @param request
 *            The SolrQueryRequest
 */
private Scorer getQueryScorer(Query query, String requestFieldname, String schemaFieldName, SolrQueryRequest request)
{
    boolean reqFieldMatch = request.getParams().getFieldBool(requestFieldname, HighlightParams.FIELD_MATCH, false);
    if (reqFieldMatch)
    {
        return new QueryTermScorer(query, request.getSearcher().getIndexReader(), schemaFieldName);
    }
    else
    {
        return new QueryTermScorer(query);
    }
}