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/* Copyright (C) 2007-2013 Arjen G Lentz & Antony T Curtis for Open Query
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; 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 Street, Fifth Floor, Boston, MA 02110-1335 USA */
/* ======================================================================
Open Query Graph Computation Engine, based on a concept by Arjen Lentz
v3 implementation by Antony Curtis, Arjen Lentz, Andrew McDonnell
For more information, documentation, support, enhancement engineering,
see http://openquery.com/graph or contact graph@openquery.com
======================================================================
*/
#include "oqgraph_shim.h"
bool oqgraph3::edge_iterator::seek()
{
if (!_graph->_cursor ||
_graph->_rnd_pos > _offset ||
_graph->_cursor != _graph->_rnd_cursor.operator->())
{
_graph->_rnd_pos= 0;
_graph->_rnd_cursor= new cursor(_graph);
if (_graph->_rnd_cursor->seek_to(boost::none, boost::none))
_graph->_rnd_pos= size_t(-1);
}
while (_graph->_rnd_pos < _offset)
{
if (_graph->_rnd_cursor->seek_next())
{
_offset = size_t(-1);
return true;
}
_graph->_rnd_pos++;
}
return false;
}
oqgraph3::edge_iterator::value_type oqgraph3::edge_iterator::operator*()
{
seek();
return *_graph->_rnd_cursor;
}
bool oqgraph3::edge_iterator::operator==(const self& x)
{
if (_offset == size_t(-1) && x._offset != size_t(-1))
return const_cast<edge_iterator&>(x).seek();
if (_offset != size_t(-1) && x._offset == size_t(-1))
return seek();
return _offset == x._offset;
}
bool oqgraph3::edge_iterator::operator!=(const self& x)
{
if (_offset == size_t(-1) && x._offset != size_t(-1))
return !const_cast<edge_iterator&>(x).seek();
if (_offset != size_t(-1) && x._offset == size_t(-1))
return !seek();
return _offset != x._offset;
}
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