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/** @file maptermlist.h
* @brief TermList which iterates a std::map.
*/
/* Copyright 1999,2000,2001 BrightStation PLC
* Copyright 2002,2003,2004,2005,2006,2007,2008,2010,2011,2013 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 OM_HGUARD_MAPTERMLIST_H
#define OM_HGUARD_MAPTERMLIST_H
#include "termlist.h"
#include "backends/inmemory/inmemory_positionlist.h"
#include "backends/document.h"
#include "omassert.h"
using namespace std;
class MapTermList : public TermList {
private:
Xapian::Document::Internal::document_terms::const_iterator it;
Xapian::Document::Internal::document_terms::const_iterator it_end;
bool started;
public:
MapTermList(const Xapian::Document::Internal::document_terms::const_iterator &it_,
const Xapian::Document::Internal::document_terms::const_iterator &it_end_)
: it(it_), it_end(it_end_), started(false)
{ }
// Gets size of termlist
Xapian::termcount get_approx_size() const {
// This method shouldn't get called on a MapTermList.
Assert(false);
return 0;
}
// Gets current termname
string get_termname() const {
Assert(started);
Assert(!at_end());
return it->first;
}
// Get wdf of current term
Xapian::termcount get_wdf() const {
Assert(started);
Assert(!at_end());
return it->second.wdf;
}
// Get num of docs indexed by term
Xapian::doccount get_termfreq() const {
throw Xapian::InvalidOperationError("Can't get term frequency from a document termlist which is not associated with a database.");
}
const std::vector<Xapian::termpos> * get_vector_termpos() const {
return &(it->second.positions);
}
Xapian::PositionIterator positionlist_begin() const {
return Xapian::PositionIterator(new InMemoryPositionList(it->second.positions));
}
Xapian::termcount positionlist_count() const {
return it->second.positions.size();
}
TermList * next() {
if (!started) {
started = true;
} else {
Assert(!at_end());
++it;
}
return NULL;
}
TermList * skip_to(const std::string & term) {
while (it != it_end && it->first < term) {
++it;
}
started = true;
return NULL;
}
// True if we're off the end of the list
bool at_end() const {
Assert(started);
return it == it_end;
}
};
#endif /* OM_HGUARD_MAPTERMLIST_H */
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