Mailing-List: contact java-user-help@lucene.apache.org; run by ezmlm
Precedence: bulk
Reply-To: java-user@lucene.apache.org
Received-SPF: pass (herse.apache.org: local policy)
From: Nicolas =?iso-8859-1?q?Lalev=E9e?= <nicolas.lalevee@anyware-tech.com>
Organization: Anyware Technologies
To: java-user@lucene.apache.org
Subject: Decorating a Query
Date: Thu, 15 Feb 2007 10:21:06 +0100
User-Agent: KMail/1.9.5
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
Message-Id: <200702151021.06794.nicolas.lalevee@anyware-tech.com>

Hi,

I wanted to implement my own query, query wich will be specific to my=20
application. The query I want to implement is in fact just a combinaison of=
=20
sevral already implemented queries. So acheive this, I do this kind of=20
things :
public class MyQuery extends Query {
  private Query query;
  public MyQuery(String foo) {
    query =3D new TermQuery("myfield", foo);
  }
  public Weight weight(Searcher searcher) throws IOException {
    return query.weight(searcher);
  }
  public String toString(String field) {
    return foo;
  }
}

But I have an issue with that kind of queries : I cannot implement=20
createWeight() as I cannot access this function on the underlying query. So=
=20
the Query's function is used with raise a UnsupportedOperationException. Fo=
r=20
basic search.search(query), it works. But when I want to filter it :
query =3D new FilteredQuery(query, filter);
search.search(query);
This raise the UnsupportedOperationException.

I just see two options there.
* make my own interface which is a factory of query. But I lost the=20
flexibility of extending Query. Even if I want to do a little term query, I=
=20
will have to make a factory of this term query.
* patch Lucene to make createWeight() public

any other advise ?

cheers,
Nicolas

=2D-=20
Nicolas LALEV=C9E
Solutions & Technologies
ANYWARE TECHNOLOGIES
Tel : +33 (0)5 61 00 52 90
=46ax : +33 (0)5 61 00 51 46
http://www.anyware-tech.com

---------------------------------------------------------------------
To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-user-help@lucene.apache.org