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From Bernhard Messer <bernhard.mes...@intrafind.de>
Subject MultiFieldQueryParser, can't change default search operator
Date Wed, 29 Oct 2003 16:27:02 GMT
hi all,

just played around with the MultiFieldQueryParser and didn't find a 
working way to change the "operator" value.

The problem is that MultiFieldQueryParser is implementing two public 
static methods "parse" only. Calling one of those, in the extended 
superclass, the static method implementation for "parse" is called. Due 
to the fact that the QueryParser class creates a new Instance for each 
call thru the static method, the "operator" flag is simply ignored.

There would be a simple fix within MultiFieldQueryParser class without 
touching the rest of the system. One have to add a new non static method 
"parse" which could look like this:

/***********************************************************/
public Query parse(String query, String[] fields) throws ParseException {
        BooleanQuery bQuery = new BooleanQuery();

        for (int i = 0; i < fields.length; i++)
        {
            QueryParser parser = new QueryParser(fields[i], analyzer);
            parser.setOperator(getOperator());
            Query q = parser.parse(query);
            bQuery.add(q, false, false);
        }
        return bQuery;
      }
/***********************************************************/


To test the new implementation, following code fragment can be used:

/***********************************************************/
            Directory directory = 
FSDirectory.getDirectory("/tmp/idx-test", false);
            Analyzer analyzer = new SimpleAnalyzer();
            Searcher searcher = new IndexSearcher(directory);
            Hits hits = null;
           
            String[] fields = { "contents", "title" };
            MultiFieldQueryParser parser = new 
MultiFieldQueryParser("britney spears", analyzer);
           
            parser.setOperator(QueryParser.DEFAULT_OPERATOR_AND);
                   
            Query query = parser.parse("britney spears", fields);
           
            System.out.println("Query: " + query.toString());
           
            hits = searcher.search(query);

            System.out.println ("Results: " + hits.length());
           
            searcher.close();
/***********************************************************/


best regards

Bernhard



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