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Posted to dev@lucene.apache.org by "Jinsong Hu (JIRA)" <ji...@apache.org> on 2013/01/29 11:25:14 UTC
[jira] [Updated] (LUCENE-4730) SmartChineseAnalyzer got wrong
matched offset
[ https://issues.apache.org/jira/browse/LUCENE-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jinsong Hu updated LUCENE-4730:
-------------------------------
Description:
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 generate 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.
was:
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.
> 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: 4.0, 4.1
> 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 generate 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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