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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
======================================================================
*/
#pragma once
#include <list>
#include <queue>
#include <string>
#include <utility>
#include "graphcore-config.h"
#include <boost/intrusive_ptr.hpp>
#include <boost/optional.hpp>
#include <boost/unordered_map.hpp>
#include <boost/unordered_set.hpp>
#include <boost/pending/queue.hpp>
#include <boost/ptr_container/ptr_deque.hpp>
#include "graphcore-types.h"
namespace oqgraph3
{
typedef open_query::VertexID vertex_id;
typedef open_query::EdgeWeight weight_t;
typedef size_t vertices_size_type;
typedef size_t edges_size_type;
typedef size_t degree_size_type;
struct graph;
struct cursor;
typedef boost::intrusive_ptr<graph> graph_ptr;
struct cursor_ptr : public boost::intrusive_ptr<cursor>
{
cursor_ptr() : boost::intrusive_ptr<cursor>() { }
cursor_ptr(cursor* pos) : boost::intrusive_ptr<cursor>(pos) { }
operator const std::string&() const;
bool operator==(const cursor_ptr&) const;
bool operator!=(const cursor_ptr&) const;
};
struct edge_info
{
cursor_ptr _cursor;
edge_info() : _cursor(0) { }
explicit edge_info(const cursor_ptr& pos) : _cursor(pos) { }
edge_info& operator=(const cursor_ptr& pos) { _cursor= pos; return *this; }
vertex_id origid() const;
vertex_id destid() const;
weight_t weight() const;
bool operator==(const edge_info&) const;
bool operator!=(const edge_info&) const;
};
struct cursor
{
mutable int _ref_count;
graph_ptr _graph;
int _index;
unsigned _parts;
std::string _key;
std::string _position;
int _debugid;
boost::optional<vertex_id> _origid;
boost::optional<vertex_id> _destid;
cursor(const graph_ptr& graph);
cursor(const cursor& src);
~cursor();
operator bool() const
{ return !_position.empty(); }
operator edge_info() const
{ return edge_info(const_cast<cursor*>(this)); }
vertex_id get_origid();
vertex_id get_destid();
weight_t get_weight();
int seek_to(
boost::optional<vertex_id> origid,
boost::optional<vertex_id> destid);
int seek_next();
int seek_prev();
void save_position();
int restore_position();
const std::string& record_position() const;
void clear_position();
int clear_position(int rc) { clear_position(); return rc; }
bool operator==(const cursor& x) const;
bool operator!=(const cursor& x) const;
friend void intrusive_ptr_add_ref(cursor* ptr)
{ ++ptr->_ref_count; }
friend void intrusive_ptr_release(cursor* ptr)
{ if (!--(ptr->_ref_count)) delete ptr; }
};
struct graph
{
mutable int _ref_count;
cursor* _cursor;
bool _stale;
cursor_ptr _rnd_cursor;
size_t _rnd_pos;
::TABLE* _table;
::Field* _source;
::Field* _target;
::Field* _weight;
::THD* get_table_thd();
void set_table_thd(::THD* thd);
graph(
::TABLE* table,
::Field* source,
::Field* target,
::Field* weight= 0);
~graph();
edges_size_type num_edges() const;
friend edges_size_type num_edges(const graph& g)
{ return g.num_edges(); }
friend void intrusive_ptr_add_ref(graph* ptr)
{ ptr->_ref_count++; }
friend void intrusive_ptr_release(graph* ptr)
{ ptr->_ref_count--; }
};
}
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