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/** @file chert_modifiedpostlist.cc
* @brief A ChertPostList plus pending modifications
*/
/* Copyright (C) 2006,2007,2008,2009,2010 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 "chert_modifiedpostlist.h"
#include "chert_database.h"
#include "debuglog.h"
ChertModifiedPostList::~ChertModifiedPostList()
{
delete poslist;
}
void
ChertModifiedPostList::skip_deletes(Xapian::weight w_min)
{
while (!ChertPostList::at_end()) {
while (it != mods.end() && it->second.first == 'D' &&
it->first < ChertPostList::get_docid())
++it;
if (it == mods.end()) return;
if (it->first != ChertPostList::get_docid()) return;
if (it->second.first != 'D') return;
++it;
ChertPostList::next(w_min);
}
while (it != mods.end() && it->second.first == 'D') ++it;
}
Xapian::doccount
ChertModifiedPostList::get_termfreq() const
{
return this_db->get_termfreq(term);
}
Xapian::docid
ChertModifiedPostList::get_docid() const
{
if (it == mods.end()) return ChertPostList::get_docid();
if (ChertPostList::at_end()) return it->first;
Assert(it->second.first != 'D');
return min(it->first, ChertPostList::get_docid());
}
Xapian::termcount
ChertModifiedPostList::get_doclength() const
{
LOGCALL(DB, Xapian::termcount, "ChertModifiedPostList::get_doclength", NO_ARGS);
if (it != mods.end() && (ChertPostList::at_end() || it->first <= ChertPostList::get_docid()))
RETURN(this_db->get_doclength(it->first));
RETURN(ChertPostList::get_doclength());
}
Xapian::termcount
ChertModifiedPostList::get_wdf() const
{
if (ChertPostList::at_end()) return it->second.second;
Xapian::docid unmod_did = ChertPostList::get_docid();
if (it != mods.end() && it->first <= unmod_did) {
if (it->first < unmod_did) return it->second.second;
return it->second.second;
}
return ChertPostList::get_wdf();
}
PositionList *
ChertModifiedPostList::read_position_list()
{
if (it != mods.end() && (ChertPostList::at_end() || it->first <= ChertPostList::get_docid())) {
if (poslist) {
delete poslist;
poslist = NULL;
}
poslist = this_db->open_position_list(it->first, term);
return poslist;
}
return ChertPostList::read_position_list();
}
PositionList *
ChertModifiedPostList::open_position_list() const
{
if (it != mods.end() && (ChertPostList::at_end() || it->first <= ChertPostList::get_docid())) {
return this_db->open_position_list(it->first, term);
}
return ChertPostList::open_position_list();
}
PostList *
ChertModifiedPostList::next(Xapian::weight w_min)
{
if (have_started) {
if (ChertPostList::at_end()) {
++it;
skip_deletes(w_min);
return NULL;
}
Xapian::docid unmod_did = ChertPostList::get_docid();
if (it != mods.end() && it->first <= unmod_did) {
if (it->first < unmod_did && it->second.first != 'D') {
++it;
skip_deletes(w_min);
return NULL;
}
++it;
}
}
ChertPostList::next(w_min);
skip_deletes(w_min);
return NULL;
}
PostList *
ChertModifiedPostList::skip_to(Xapian::docid desired_did, Xapian::weight w_min)
{
if (!ChertPostList::at_end()) ChertPostList::skip_to(desired_did, w_min);
/* FIXME: should we use lower_bound() on the map? */
while (it != mods.end() && it->first < desired_did) ++it;
skip_deletes(w_min);
return NULL;
}
bool
ChertModifiedPostList::at_end() const {
return it == mods.end() && ChertPostList::at_end();
}
std::string
ChertModifiedPostList::get_description() const
{
std::string desc = "ChertModifiedPostList(";
desc += ChertPostList::get_description();
desc += ')';
return desc;
}
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