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/** @file multi_postlist.h
* @brief C++ class definition for multiple database access
*/
/* Copyright 1999,2000,2001 BrightStation PLC
* Copyright 2003,2005,2007,2009,2011 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 OM_HGUARD_MULTI_POSTLIST_H
#define OM_HGUARD_MULTI_POSTLIST_H
#include "api/leafpostlist.h"
#include <vector>
class MultiPostList : public PostList {
friend class Xapian::Database;
private:
std::vector<LeafPostList *> postlists;
const Xapian::Database &this_db;
bool finished;
Xapian::docid currdoc;
Xapian::doccount multiplier;
MultiPostList(std::vector<LeafPostList *> & pls,
const Xapian::Database &this_db_);
public:
~MultiPostList();
Xapian::doccount get_termfreq_min() const;
Xapian::doccount get_termfreq_max() const;
Xapian::doccount get_termfreq_est() const;
double get_maxweight() const;
double get_weight() const;
double recalc_maxweight();
Xapian::docid get_docid() const; // Gets current docid
Xapian::termcount get_doclength() const; // Get length of current document
Xapian::termcount get_unique_terms() const; // Get number of unique term in current document
Xapian::termcount get_wdf() const; // Within Document Frequency
PositionList * open_position_list() const;
PostList *next(double w_min); // Moves to next docid
PostList *skip_to(Xapian::docid did, double w_min);// Moves to next docid >= specified docid
bool at_end() const; // True if we're off the end of the list
std::string get_description() const;
};
#endif /* OM_HGUARD_MULTI_POSTLIST_H */
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