karl �ie wrote:
> I have a Lucene Document with a field named "element" which is stored
> and indexed but not tokenized. The value of the field is "POST"
> (uppercase). But the only way i can match the field is by entering
> "element:POST?" or "element:POST*" in the QueryParser class.
There are two ways to do this.
If this must be entered by users in the query string, then you need to
use a non-lowercasing analyzer for this field. The way to do this if
you're currently using StandardAnalyzer, is to do something like:
public class MyAnalyzer extends Analyzer {
private Analyzer standard = new StandardAnalyzer();
public TokenStream tokenStream(String field, final Reader reader) {
if ("element".equals(field)) { // don't tokenize
return new CharTokenizer(reader) {
protected boolean isTokenChar(char c) { return true; }
};
} else { // use standard analyzer
return standard.tokenStream(field, reader);
}
}
}
Analyzer analyzer = new MyAnalyzer();
Query query = queryParser.parse("... +element:POST", analyzer);
Alternately, if this query field is added by a program, then this can be
done by bypassing the analyzer for this class, building this clause
directly instead:
Analyzer analyzer = new StandardAnalyzer();
BooleanQuery query = (BooleanQuery)queryParser.parse("...", analyzer);
// now add the element clause
query.add(new TermQuery(new Term("element", "POST"))), true, false);
Perhaps this should become an FAQ...
Doug
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