Examples with SimpleHTMLEncoder org.apache.lucene.search.highlight.SimpleHTMLEncoder used on opensource projects

Example 6 with SimpleHTMLEncoder

use of org.apache.lucene.search.highlight.SimpleHTMLEncoder in project openolat by klemens.

the class SearchResultsImpl method doHighlight.

/**
 * Highlight (bold,color) query words in result-document. Set HighlightResult for content or description.
 * @param query
 * @param analyzer
 * @param doc
 * @param resultDocument
 * @throws IOException
 */
private void doHighlight(Query query, Analyzer analyzer, Document doc, ResultDocument resultDocument) throws IOException {
    Highlighter highlighter = new Highlighter(new SimpleHTMLFormatter(HIGHLIGHT_PRE_TAG, HIGHLIGHT_POST_TAG), new SimpleHTMLEncoder(), new QueryScorer(query));
    // Get 3 best fragments of content and seperate with a "..."
    try {
        // highlight content
        String content = doc.get(AbstractOlatDocument.CONTENT_FIELD_NAME);
        TokenStream tokenStream = analyzer.tokenStream(AbstractOlatDocument.CONTENT_FIELD_NAME, new StringReader(content));
        String highlightResult = highlighter.getBestFragments(tokenStream, content, 3, HIGHLIGHT_SEPARATOR);
        // if no highlightResult is in content => look in description
        if (highlightResult.length() == 0) {
            String description = doc.get(AbstractOlatDocument.DESCRIPTION_FIELD_NAME);
            tokenStream = analyzer.tokenStream(AbstractOlatDocument.DESCRIPTION_FIELD_NAME, new StringReader(description));
            highlightResult = highlighter.getBestFragments(tokenStream, description, 3, HIGHLIGHT_SEPARATOR);
            resultDocument.setHighlightingDescription(true);
        }
        resultDocument.setHighlightResult(highlightResult);
        // highlight title
        String title = doc.get(AbstractOlatDocument.TITLE_FIELD_NAME);
        title = title.trim();
        if (title.length() > 128) {
            title = FilterFactory.getHtmlTagAndDescapingFilter().filter(title);
            title = Formatter.truncate(title, 128);
        }
        tokenStream = analyzer.tokenStream(AbstractOlatDocument.TITLE_FIELD_NAME, new StringReader(title));
        String highlightTitle = highlighter.getBestFragments(tokenStream, title, 3, " ");
        resultDocument.setHighlightTitle(highlightTitle);
    } catch (InvalidTokenOffsetsException e) {
        log.warn("", e);
    }
}