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/** @file multi_alltermslist.h
* @brief Class for merging AllTermsList objects from subdatabases.
*/
/* Copyright (C) 2007,2008,2011 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
*/
#ifndef XAPIAN_INCLUDED_MULTI_ALLTERMSLIST_H
#define XAPIAN_INCLUDED_MULTI_ALLTERMSLIST_H
#include "backends/alltermslist.h"
#include "backends/database.h"
#include <string>
#include <vector>
/// Class for merging AllTermsList objects from subdatabases.
class MultiAllTermsList : public AllTermsList {
/// Don't allow assignment.
void operator=(const MultiAllTermsList &);
/// Don't allow copying.
MultiAllTermsList(const MultiAllTermsList &);
/// Current termname (or empty if we haven't started yet).
std::string current_term;
/// Vector of sub-termlists which we use as a heap.
std::vector<TermList *> termlists;
public:
/// Constructor.
MultiAllTermsList(const std::vector<Xapian::Internal::intrusive_ptr<Xapian::Database::Internal> > & dbs,
const std::string & prefix);
/// Destructor.
~MultiAllTermsList();
/// Return the termname at the current position.
std::string get_termname() const;
/// Return the term frequency for the term at the current position.
Xapian::doccount get_termfreq() const;
/// Return the collection frequency for the term at the current position.
Xapian::termcount get_collection_freq() const;
/// Advance the current position to the next term in the termlist.
TermList *next();
/** Skip forward to the specified term.
*
* If the specified term isn't in the list, position ourselves on the
* first term after @a term (or at_end() if no terms after @a term exist).
*/
TermList *skip_to(const std::string &term);
/// Return true if the current position is past the last term in this list.
bool at_end() const;
};
#endif // XAPIAN_INCLUDED_MULTI_ALLTERMSLIST_H
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