matcher/orpostlist.h

Go to the documentation of this file.

/* orpostlist.h: OR of two posting lists
 *
 * Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2002 Ananova Ltd
 * Copyright 2003,2004,2009,2010 Olly Betts
 * Copyright 2009 Lemur Consulting Ltd
 * Copyright 2010 Richard Boulton
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

#ifndef OM_HGUARD_ORPOSTLIST_H
#define OM_HGUARD_ORPOSTLIST_H

#include "branchpostlist.h"

class OrPostList : public BranchPostList {
    private:
        Xapian::docid lhead, rhead;
        bool lvalid, rvalid;
        Xapian::weight lmax, rmax, minmax;
        Xapian::doccount dbsize;
    public:
        Xapian::doccount get_termfreq_max() const;
        Xapian::doccount get_termfreq_min() const;
        Xapian::doccount get_termfreq_est() const;
        TermFreqs get_termfreq_est_using_stats(
            const Xapian::Weight::Internal & stats) const;

        Xapian::docid  get_docid() const;
        Xapian::weight get_weight() const;
        Xapian::weight get_maxweight() const;

        Xapian::weight recalc_maxweight();

        PostList *next(Xapian::weight w_min);
        PostList *skip_to(Xapian::docid did, Xapian::weight w_min);
        PostList *check(Xapian::docid did, Xapian::weight w_min, bool &valid);
        bool   at_end() const;

        std::string get_description() const;

        virtual Xapian::termcount get_doclength() const;

        OrPostList(PostList * left_,
                   PostList * right_,
                   MultiMatch * matcher_,
                   Xapian::doccount dbsize_);

        Xapian::termcount get_wdf() const;

        Xapian::termcount count_matching_subqs() const;
};

#endif /* OM_HGUARD_ORPOSTLIST_H */

---