Jinsong Hu created LUCENE-4730:
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Summary: SmartChineseAnalyzer got wrong matched offset
Key: LUCENE-4730
URL: https://issues.apache.org/jira/browse/LUCENE-4730
Project: Lucene - Core
Issue Type: Bug
Components: modules/analysis
Affects Versions: 4.1, 4.0
Environment: JDK1.7 Linux/Windows
Reporter: Jinsong Hu
Priority: Critical
We found that SmartChineseAnalyzer got wrong matched offset with the following
test code:
public void testHighlight() throws Exception {
String text = "My China ";
String queryText = "China";
StringBuilder builder = new StringBuilder("<html>");
Analyzer analyzer = new SmartChineseAnalyzer(Version.LUCENE_40);
//Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_40);
QueryParser parser = new QueryParser(Version.LUCENE_40, "text",
analyzer);
Query query = parser.parse(queryText);
SimpleHTMLFormatter formatter = new SimpleHTMLFormatter("<span
style=\"background: yellow\">", "</span>");
TokenStream tokens = analyzer.tokenStream("text", new
StringReader(text));
QueryScorer scorer = new QueryScorer(query, "text");
Highlighter highlighter = new Highlighter(formatter, scorer);
highlighter.setTextFragmenter(new SimpleSpanFragmenter(scorer));
String result = highlighter.getBestFragments(tokens, text, 10, "...");
if (result.length() < text.length()) {
result = text;
}
builder.append("<body>");
builder.append(result);
builder.append("</body>");
builder.append("</html>");
System.out.println(builder.toString());
}
This method will generated a hilighted text, however, the highlight position is
obviously wrong, and if we remove one space from the text, that is, changed
text from "My China " to "My China ", it will generate a text with correct
highlight. If we change the analyzer from SmartChineseAnalyzer to
StandardAnalyzer, the highlight issue will disappear.
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