mergepostlist.h

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/* Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2002 Ananova Ltd
 * Copyright 2002,2003,2004,2005,2009,2011,2015,2016 Olly Betts
 * Copyright 2007 Lemur Consulting Ltd
 *
 * 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_MERGEPOSTLIST_H
#define OM_HGUARD_MERGEPOSTLIST_H

#include "api/postlist.h"

class MultiMatch;
class ValueStreamDocument;

class MergePostList : public PostList {
    private:
        // Prevent copying
        MergePostList(const MergePostList &);
        MergePostList & operator=(const MergePostList &);

        double w_max;

        vector<PostList *> plists;

        int current;

        MultiMatch *matcher;

        ValueStreamDocument & vsdoc;

    public:
        Xapian::termcount get_wdf() const;
        Xapian::doccount get_termfreq_max() const;
        Xapian::doccount get_termfreq_min() const;
        Xapian::doccount get_termfreq_est() const;

        Xapian::docid get_docid() const;
        double get_weight() const;
        const string * get_sort_key() const;
        const string * get_collapse_key() const;

        double get_maxweight() const;

        double recalc_maxweight();

        PostList *next(double w_min);
        PostList *skip_to(Xapian::docid did, double w_min);
        bool at_end() const;

        string get_description() const;

        virtual Xapian::termcount get_doclength() const;

        virtual Xapian::termcount get_unique_terms() const;

        Xapian::termcount count_matching_subqs() const;

        MergePostList(const std::vector<PostList *> & plists_,
                      MultiMatch *matcher_,
                      ValueStreamDocument & vsdoc_)
            : plists(plists_), current(-1), matcher(matcher_), vsdoc(vsdoc_)
        { }

        ~MergePostList();
};

#endif /* OM_HGUARD_MERGEPOSTLIST_H */