multixorpostlist.h

Go to the documentation of this file.

 
/* Copyright (C) 2007,2009,2010,2011,2012 Olly Betts
 * Copyright (C) 2009 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 XAPIAN_INCLUDED_MULTIXORPOSTLIST_H
#define XAPIAN_INCLUDED_MULTIXORPOSTLIST_H
 
#include "multimatch.h"
#include "api/postlist.h"
#include <algorithm>
 
class MultiMatch;
 
class MultiXorPostList : public PostList {
    void operator=(const MultiXorPostList &);
 
    MultiXorPostList(const MultiXorPostList &);
 
    Xapian::docid did;
 
    size_t n_kids;
 
    PostList ** plist;
 
    double max_total;
 
    Xapian::doccount db_size;
 
    MultiMatch *matcher;
 
    void erase_sublist(size_t i) {
        delete plist[i];
        --n_kids;
        for (size_t j = i; j < n_kids; ++j) {
            plist[j] = plist[j + 1];
        }
        matcher->recalc_maxweight();
    }
 
  public:
    template<class RandomItor>
    MultiXorPostList(RandomItor pl_begin, RandomItor pl_end,
                     MultiMatch * matcher_, Xapian::doccount db_size_)
        : did(0), n_kids(pl_end - pl_begin), plist(NULL),
          max_total(0), db_size(db_size_), matcher(matcher_)
    {
        plist = new PostList * [n_kids];
        std::copy(pl_begin, pl_end, plist);
    }
 
    ~MultiXorPostList();
 
    Xapian::doccount get_termfreq_min() const;
 
    Xapian::doccount get_termfreq_max() const;
 
    Xapian::doccount get_termfreq_est() const;
 
    TermFreqs get_termfreq_est_using_stats(
        const Xapian::Weight::Internal & stats) const;
 
    double get_maxweight() const;
 
    Xapian::docid get_docid() const;
 
    Xapian::termcount get_doclength() const;
 
    Xapian::termcount get_unique_terms() const;
 
    double get_weight() const;
 
    bool at_end() const;
 
    double recalc_maxweight();
 
    PositionList * read_position_list() {
        return NULL;
    }
 
    PostList* next(double w_min);
 
    PostList* skip_to(Xapian::docid, double w_min);
 
    std::string get_description() const;
 
    Xapian::termcount get_wdf() const;
 
    Xapian::termcount count_matching_subqs() const;
};
 
#endif // XAPIAN_INCLUDED_MULTIXORPOSTLIST_H