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From Bill Janssen <jans...@parc.com>
Subject new version of NewMultiFieldQueryParser
Date Tue, 26 Oct 2004 17:33:01 GMT
Thanks to something Doug said when I first opened this discussion, I
went back and looked at my implementation.  He said, "Can't we just do
this in getFieldQuery?".  Figuring that he probably knew what he was
talking about, I looked a bit harder, and it turns out he was right.
Here's a much simpler version of NewMultiFieldQueryParser that seems
to work.

[For those just tuning in, this is a version of MultiFieldQueryParser
that will work with a default query operator of AND, as well as with
OR.]

Enjoy!

Bill

class NewMultiFieldQueryParser extends QueryParser {

    static private final String DEFAULT_FIELD = "%%";

    protected String[] fieldnames = null;
    private Analyzer analyzer = null;

    public NewMultiFieldQueryParser (Analyzer a) {
        super(DEFAULT_FIELD, a);
    }

    public NewMultiFieldQueryParser (String[] f, Analyzer a) {
        super(DEFAULT_FIELD, a);
        fieldnames = f;
        analyzer = a;
    }

    public void setFieldNames (String[] f) {
        fieldnames = f;
    }

    protected Query getFieldQuery (String field,
                                   Analyzer a,
                                   String queryText)
        throws ParseException {

        Query x = super.getFieldQuery(field, a, queryText);

        if (field == DEFAULT_FIELD && (fieldnames != null)) {

            BooleanQuery q2 = new BooleanQuery();

            if (x instanceof PhraseQuery) {
                Term[] terms = ((PhraseQuery)x).getTerms();
                for (int i = 0;  i < fieldnames.length;  i++) {
                    PhraseQuery q3 = new PhraseQuery();
                    q3.setSlop(((PhraseQuery)x).getSlop());
                    for (int j = 0;  j < terms.length;  j++) {
                        q3.add(new Term(fieldnames[i], terms[j].text()));
                    }
                    q2.add(q3, false, false);
                }
            } else if (x instanceof TermQuery) {
                String text = ((TermQuery)x).getTerm().text();
                for (int i = 0;  i < fieldnames.length;  i++) {
                    q2.add(new TermQuery(new Term(fieldnames[i], text)), false, false);
                }
            }

            return q2;
        }
        return x;
    }
}


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