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https://issues.apache.org/jira/browse/LUCENE-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047046#comment-14047046
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Michael Dodsworth commented on LUCENE-4730:
-------------------------------------------
This appears to be a symptom of LUCENE-4984 (fixed in 4.8).
The following test fails:
{code:java}
// note Version.LUCENE_4_7
assertAnalyzesTo(new SmartChineseAnalyzer(Version.LUCENE_4_7, true), "My China
",
new String[] { "my", "china"}, new int[] {0,3}, new int[] {2, 8});
{code}
whereas this passes:
{code:java}
note Version.LUCENE_4_8
assertAnalyzesTo(new SmartChineseAnalyzer(Version.LUCENE_4_8, true), "My China
",
new String[] { "my", "china"}, new int[] {0,3}, new int[] {2, 8});
{code}
I'll add a test to verify this double-whitespace case but otherwise, this can
be closed out.
> 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, change
> text from "My China " (ends with two spaces) to "My China " (ends with one
> space), 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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