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/* multi_termlist.cc: C++ class definition for multiple database access
*
* Copyright 1999,2000,2001 BrightStation PLC
* Copyright 2002,2003,2004,2005,2006,2007,2008,2010,2011 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
*/
#include <config.h>
#include "multi_termlist.h"
#include "backends/database.h"
#include "debuglog.h"
#include "expand/expandweight.h"
MultiTermList::MultiTermList(TermList * tl_,
const Xapian::Database &db_,
size_t db_index_)
: tl(tl_), db(db_), db_index(db_index_)
{
termfreq_factor = double(db.get_doccount());
termfreq_factor /= db.internal[db_index]->get_doccount();
LOGLINE(DB, "Approximation factor for termfreq: " << termfreq_factor);
}
MultiTermList::~MultiTermList()
{
delete tl;
}
Xapian::termcount
MultiTermList::get_approx_size() const
{
return tl->get_approx_size();
}
void
MultiTermList::accumulate_stats(Xapian::Internal::ExpandStats & stats) const
{
// For a multidb, every termlist access during expand will be through
// a MultiTermList, so it's safe to just set db_index like this.
stats.db_index = db_index;
tl->accumulate_stats(stats);
}
string
MultiTermList::get_termname() const
{
return tl->get_termname();
}
Xapian::termcount MultiTermList::get_wdf() const
{
return tl->get_wdf();
}
Xapian::doccount MultiTermList::get_termfreq() const
{
// Approximate term frequency
return Xapian::doccount(tl->get_termfreq() * termfreq_factor);
}
TermList * MultiTermList::next()
{
return tl->next();
}
TermList * MultiTermList::skip_to(const string & term)
{
return tl->skip_to(term);
}
bool MultiTermList::at_end() const
{
return tl->at_end();
}
Xapian::termcount
MultiTermList::positionlist_count() const
{
return tl->positionlist_count();
}
Xapian::PositionIterator
MultiTermList::positionlist_begin() const
{
return tl->positionlist_begin();
}
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