andmaybepostlist.h

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/* Copyright 2017 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, see
 * <https://www.gnu.org/licenses/>.
 */
 
#ifndef XAPIAN_INCLUDED_ANDMAYBEPOSTLIST_H
#define XAPIAN_INCLUDED_ANDMAYBEPOSTLIST_H
 
#include "postlisttree.h"
#include "wrapperpostlist.h"
 
class AndMaybePostList : public WrapperPostList {
    PostList* r;
 
    Xapian::docid pl_did = 0;
 
    Xapian::docid r_did = 0;
 
    double pl_max;
 
    double r_max;
 
    PostListTree* pltree;
 
    bool maybe_matches() const { return pl_did == r_did; }
 
    PostList* decay_to_and(Xapian::docid did,
                           double w_min,
                           bool* valid_ptr = NULL);
 
  public:
    AndMaybePostList(PostList* left, PostList* right, PostListTree* pltree_)
        : WrapperPostList(left), r(right), pltree(pltree_)
    {}
 
    AndMaybePostList(PostList* left,
                     PostList* right,
                     double lmax,
                     double rmax,
                     PostListTree* pltree_)
        : WrapperPostList(left), r(right), pl_max(lmax), r_max(rmax),
          pltree(pltree_)
    { }
 
    ~AndMaybePostList() { delete r; }
 
    Xapian::docid get_docid() const;
 
    double get_weight(Xapian::termcount doclen,
                      Xapian::termcount unique_terms,
                      Xapian::termcount wdfdocmax) const;
 
    double recalc_maxweight();
 
    PostList* next(double w_min);
 
    PostList* skip_to(Xapian::docid did, double w_min);
 
    PostList* check(Xapian::docid did, double w_min, bool& valid);
 
    std::string get_description() const;
 
    Xapian::termcount get_wdf() const;
 
    Xapian::termcount count_matching_subqs() const;
 
    void gather_position_lists(OrPositionList* orposlist);
};
 
#endif // XAPIAN_INCLUDED_ANDMAYBEPOSTLIST_H