matcher/valuerangepostlist.h

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/* Copyright 2007,2008 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 XAPIAN_INCLUDED_VALUERANGEPOSTLIST_H
#define XAPIAN_INCLUDED_VALUERANGEPOSTLIST_H

#include "database.h"
#include "postlist.h"

class ValueRangePostList : public PostList {
  protected:
    const Xapian::Database::Internal *db;

    Xapian::valueno valno;

    const std::string begin, end;

    Xapian::docid current;

    Xapian::doccount db_size;

    LeafPostList * alldocs_pl;

    ValueRangePostList(const ValueRangePostList &);

    void operator=(const ValueRangePostList &);

  public:
    ValueRangePostList(const Xapian::Database::Internal *db_,
                       Xapian::valueno valno_,
                       const std::string &begin_, const std::string &end_)
        : db(db_), valno(valno_), begin(begin_), end(end_), current(0),
          db_size(db->get_doccount()), alldocs_pl(0) { }

    ~ValueRangePostList();

    Xapian::doccount get_termfreq_min() const;

    Xapian::doccount get_termfreq_est() const;

    Xapian::doccount get_termfreq_max() const;

    Xapian::weight get_maxweight() const;

    Xapian::docid get_docid() const;

    Xapian::weight get_weight() const;

    Xapian::doclength get_doclength() const;

    Xapian::weight recalc_maxweight();

    PositionList * read_position_list();

    PositionList * open_position_list() const;

    PostList * next(Xapian::weight w_min);

    PostList * skip_to(Xapian::docid, Xapian::weight w_min);

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

    bool at_end() const;

    string get_description() const;
};

#endif /* XAPIAN_INCLUDED_VALUERANGEPOSTLIST_H */

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