common/expand.h

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/* expand.h: class for finding expand terms
 *
 * Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2002,2003,2007 Olly Betts
 *
 * 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_EXPAND_H
#define OM_HGUARD_EXPAND_H

#include "database.h"
#include "termlist.h"
#include <xapian/enquire.h>

#include <queue>
#include <stack>
#include <vector>
#include "autoptr.h"

class RSetI;

class OmExpand {
    private:
        // disallow copy
        OmExpand(const OmExpand &);
        void operator=(const OmExpand &);

        const Xapian::Database &db;

        bool recalculate_maxweight;
        AutoPtr<TermList> build_tree(const RSetI *rset);

    public:
        OmExpand(const Xapian::Database &db_);

        void expand(Xapian::termcount max_esize,
                    Xapian::ESet & eset,
                    const RSetI * rset,
                    const Xapian::ExpandDecider * decider,
                    bool use_exact_termfreq,
                    double expand_k);
};

inline OmExpand::OmExpand(const Xapian::Database &db_) : db(db_)
{
}

#endif /* OM_HGUARD_EXPAND_H */

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