inmemory_positionlist.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_INMEMORY_POSITIONLIST_H
#define XAPIAN_INCLUDED_INMEMORY_POSITIONLIST_H
 
#include "api/smallvector.h"
#include "backends/positionlist.h"
 
class InMemoryPositionList : public PositionList {
    Xapian::VecCOW<Xapian::termpos> positions;
 
    size_t index = size_t(-1);
 
    void operator=(const InMemoryPositionList&) = delete;
 
    InMemoryPositionList(const InMemoryPositionList&) = delete;
 
  public:
    InMemoryPositionList() {}
 
    explicit
    InMemoryPositionList(Xapian::VecCOW<Xapian::termpos>&& positions_)
        : positions(std::move(positions_)) {}
 
    explicit
    InMemoryPositionList(const Xapian::VecCOW<Xapian::termpos>& positions_)
        : positions(positions_.copy()) {}
 
    void assign(Xapian::VecCOW<Xapian::termpos>&& positions_) {
        positions = std::move(positions_);
        index = size_t(-1);
    }
 
    void assign(const Xapian::VecCOW<Xapian::termpos>& positions_) {
        positions = positions_.copy();
        index = size_t(-1);
    }
 
    Xapian::termcount get_approx_size() const;
 
    Xapian::termpos back() const;
 
    Xapian::termpos get_position() const;
 
    bool next();
 
    bool skip_to(Xapian::termpos termpos);
};
 
#endif // XAPIAN_INCLUDED_INMEMORY_POSITIONLIST_H