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/** @file externalpostlist.h
* @brief Return document ids from an external source.
*/
/* Copyright 2008,2009,2011 Olly Betts
* Copyright 2009 Lemur Consulting Ltd
*
* 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_EXTERNALPOSTLIST_H
#define XAPIAN_INCLUDED_EXTERNALPOSTLIST_H
#include "api/postlist.h"
namespace Xapian {
class PostingSource;
}
class MultiMatch;
class ExternalPostList : public PostList {
/// Disallow copying.
ExternalPostList(const ExternalPostList &);
/// Disallow assignment.
void operator=(const ExternalPostList &);
Xapian::PostingSource * source;
bool source_is_owned;
Xapian::docid current;
double factor;
PostList * update_after_advance();
public:
/** Constructor.
*
* @param matcher The matcher to notify when maximum weight changes.
*/
ExternalPostList(const Xapian::Database & db,
Xapian::PostingSource *source_,
double factor_,
MultiMatch * matcher);
~ExternalPostList();
Xapian::doccount get_termfreq_min() const;
Xapian::doccount get_termfreq_est() const;
Xapian::doccount get_termfreq_max() const;
double get_maxweight() const;
Xapian::docid get_docid() const;
double get_weight() const;
Xapian::termcount get_doclength() const;
Xapian::termcount get_unique_terms() const;
double recalc_maxweight();
PositionList * read_position_list();
PositionList * open_position_list() const;
PostList * next(double w_min);
PostList * skip_to(Xapian::docid, double w_min);
PostList * check(Xapian::docid did, double w_min, bool &valid);
bool at_end() const;
Xapian::termcount count_matching_subqs() const;
std::string get_description() const;
};
#endif /* XAPIAN_INCLUDED_EXTERNALPOSTLIST_H */
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