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/** @file emptypostlist.cc
* @brief A PostList which contains no entries.
*/
/* Copyright (C) 2009,2010,2011,2015 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
*/
#include <config.h>
#include "emptypostlist.h"
#include "omassert.h"
using namespace std;
Xapian::doccount
EmptyPostList::get_termfreq_min() const
{
return 0;
}
Xapian::doccount
EmptyPostList::get_termfreq_max() const
{
return 0;
}
Xapian::doccount
EmptyPostList::get_termfreq_est() const
{
return 0;
}
// OP_WILDCARD which expands to no terms becomes EmptyPostList, and this is
// needed if that is used under OP_SYNONYM.
TermFreqs
EmptyPostList::get_termfreq_est_using_stats(const Xapian::Weight::Internal &) const
{
return TermFreqs();
}
double
EmptyPostList::get_maxweight() const
{
return 0;
}
Xapian::docid
EmptyPostList::get_docid() const
{
Assert(false);
return 0;
}
Xapian::termcount
EmptyPostList::get_doclength() const
{
return Xapian::termcount(EmptyPostList::get_docid());
}
Xapian::termcount
EmptyPostList::get_unique_terms() const
{
return Xapian::termcount(EmptyPostList::get_docid());
}
double
EmptyPostList::get_weight() const
{
Assert(false);
return 0;
}
bool
EmptyPostList::at_end() const
{
return true;
}
double
EmptyPostList::recalc_maxweight()
{
return EmptyPostList::get_maxweight();
}
PostList *
EmptyPostList::next(double)
{
return NULL;
}
PostList *
EmptyPostList::skip_to(Xapian::docid, double)
{
return NULL;
}
string
EmptyPostList::get_description() const
{
return "EmptyPostList";
}
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