private string Highlight(Highlighter highlighter, string description)
{
description = SimpleHTMLEncoder.HtmlEncode(description);
if (highlighter != null)
{
var stream = _analyzer.TokenStream("", new StringReader(description));
var sample = highlighter.GetBestFragments(stream, description, 2, "...");
if (!string.IsNullOrEmpty(sample))
{
return(sample);
}
}
return(description);
}
protected string Highlight(LuceneQuery query, string text, bool htmlEncodeOutput)
{
if (string.IsNullOrEmpty(text))
{
return(string.Empty);
}
try
{
Encoder encoder;
if (htmlEncodeOutput)
{
encoder = new SimpleHTMLEncoder();
}
else
{
encoder = new DefaultEncoder();
}
if (query == null)
{
return(encoder.encodeText(text)); // nothing to highlight
}
// Build the highlighter.
var formatter = new SimpleHTMLFormatter(_configuration.StartTag, _configuration.EndTag);
var highlighter = new LuceneHighlighter(formatter, encoder, new QueryScorer(query));
highlighter.setTextFragmenter(new NullFragmenter());
// Perform highlighting.
var highlightedHtml = highlighter.getBestFragment(_contentAnalyzer, string.Empty, text);
return(highlightedHtml ?? encoder.encodeText(text));
}
catch (Exception)
{
// on error just return the original string
return(text);
}
}
protected string Summarize(LuceneQuery query, string text, bool htmlEncodeOutput)
{
if (query == null || string.IsNullOrEmpty(text))
{
return(null);
}
try
{
// Build the highlighter.
var formatter = new SimpleHTMLFormatter(_configuration.StartTag, _configuration.EndTag);
var scorer = new QueryScorer(query);
Encoder encoder;
if (htmlEncodeOutput)
{
encoder = new SimpleHTMLEncoder();
}
else
{
encoder = new DefaultEncoder();
}
var highlighter = new LuceneHighlighter(formatter, encoder, scorer);
highlighter.setTextFragmenter(new SimpleSpanFragmenter(scorer, _configuration.FragmentSize));
// Perform highlighting.
var tokenStream = _contentAnalyzer.tokenStream(string.Empty, new java.io.StringReader(text));
return(highlighter.getBestFragments(tokenStream, text, _configuration.MaxFragments, _configuration.Separator));
}
catch (Exception)
{
// on error just return the original string
return(text);
}
}
