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/** @file emptypostlist.h
* @brief A PostList which contains no entries.
*/
/* Copyright (C) 2009,2011,2015 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 XAPIAN_INCLUDED_EMPTYPOSTLIST_H
#define XAPIAN_INCLUDED_EMPTYPOSTLIST_H
#include "postlist.h"
/// A PostList which contains no entries.
class EmptyPostList : public PostList {
/// Don't allow assignment.
void operator=(const EmptyPostList &);
/// Don't allow copying.
EmptyPostList(const EmptyPostList &);
public:
/// Constructor.
EmptyPostList() { }
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 &) 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();
PostList * next(double w_min);
PostList * skip_to(Xapian::docid, double w_min);
std::string get_description() const;
};
#endif // XAPIAN_INCLUDED_EMPTYPOSTLIST_H
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