selectpostlist.h

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/* Copyright 2017-2022 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_SELECTPOSTLIST_H
#define XAPIAN_INCLUDED_SELECTPOSTLIST_H
 
#include "wrapperpostlist.h"
 
#include <cmath>
 
class EstimateOp;
class PostListTree;
 
class SelectPostList : public WrapperPostList {
    double cached_weight = -HUGE_VAL;
 
    PostListTree* pltree;
 
    bool vet(double w_min);
 
  protected:
    Xapian::doccount accepted = 0;
 
    Xapian::doccount rejected = 0;
 
    EstimateOp* estimate_op;
 
    virtual bool test_doc() = 0;
 
  public:
    SelectPostList(PostList* pl_,
                   EstimateOp* estimate_op_,
                   PostListTree* pltree_)
        : WrapperPostList(pl_), pltree(pltree_), estimate_op(estimate_op_) {}
 
    ~SelectPostList();
 
    double get_weight(Xapian::termcount doclen,
                      Xapian::termcount unique_terms,
                      Xapian::termcount wdfdocmax) const;
 
    bool at_end() const;
 
    PostList* next(double w_min);
 
    PostList* skip_to(Xapian::docid did, double w_min);
 
    PostList* check(Xapian::docid did, double w_min, bool& valid);
};
 
#endif // XAPIAN_INCLUDED_SELECTPOSTLIST_H