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/*PGR-GNU*****************************************************************
File: binaryBreadthFirstSearch.hpp
Copyright (c) 2019 pgRouting developers
Mail: project@pgrouting.org
Copyright (c) 2019 Gudesa Venkata Sai AKhil
Mail: gvs.akhil1997@gmail.com
------
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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
********************************************************************PGR-GNU*/
#ifndef INCLUDE_BREADTHFIRSTSEARCH_BINARYBREADTHFIRSTSEARCH_HPP_
#define INCLUDE_BREADTHFIRSTSEARCH_BINARYBREADTHFIRSTSEARCH_HPP_
#pragma once
#include <deque>
#include <algorithm>
#include <cmath>
#include <limits>
#include <vector>
#include <set>
#include <map>
#include <cstdint>
#include "cpp_common/path.hpp"
#include "cpp_common/base_graph.hpp"
#include "cpp_common/assert.hpp"
#include "c_types/ii_t_rt.h"
namespace pgrouting {
namespace functions {
template <class G>
class Pgr_binaryBreadthFirstSearch {
public:
typedef typename G::V V;
typedef typename G::E E;
typedef typename G::B_G B_G;
typedef typename G::EO_i EO_i;
typedef typename G::E_i E_i;
std::deque<Path> binaryBreadthFirstSearch(
G &graph,
const std::vector<int64_t> &start_vertex,
const std::vector<int64_t> &end_vertex) {
std::deque<Path> paths;
for (const auto &source : start_vertex) {
auto result_paths = one_to_many_binaryBreadthFirstSearch(
graph,
source,
end_vertex);
std::sort(result_paths.begin(), result_paths.end(),
[](const Path &e1, const Path &e2) -> bool {
return e1.end_id() < e2.end_id();
});
paths.insert(
paths.begin(),
std::make_move_iterator(result_paths.begin()),
std::make_move_iterator(result_paths.end()));
}
return paths;
}
std::deque<Path> binaryBreadthFirstSearch(
G &graph,
const std::map<int64_t, std::set<int64_t>> &combinations) {
std::deque<Path> paths;
for (const auto &c : combinations) {
if (!graph.has_vertex(c.first)) continue;
std::deque<Path> result_paths = one_to_many_binaryBreadthFirstSearch(
graph, c.first, c.second);
paths.insert(
paths.begin(),
std::make_move_iterator(result_paths.begin()),
std::make_move_iterator(result_paths.end()));
}
std::sort(paths.begin(), paths.end(),
[](const Path &e1, const Path &e2) -> bool {
return e1.end_id() < e2.end_id();
});
std::stable_sort(paths.begin(), paths.end(),
[](const Path &e1, const Path &e2) -> bool {
return e1.start_id() < e2.start_id();
});
return paths;
}
private:
E default_edge;
std::deque<Path> one_to_many_binaryBreadthFirstSearch(
const G &graph,
int64_t start_vertex,
const std::set<int64_t> &end_vertex) {
std::deque<Path> paths;
if (!graph.has_vertex(start_vertex)) return paths;
std::vector<double> current_cost(graph.num_vertices(), std::numeric_limits<double>::infinity());
std::vector<E> from_edge(graph.num_vertices());
std::deque<V> dq;
default_edge = from_edge[0];
auto bgl_start_vertex = graph.get_V(start_vertex);
current_cost[bgl_start_vertex] = 0;
dq.push_front(bgl_start_vertex);
while (dq.empty() == false) {
auto head_vertex = dq.front();
dq.pop_front();
updateVertexCosts(graph, current_cost, from_edge, dq, head_vertex);
}
for (auto target_vertex : end_vertex) {
if (!graph.has_vertex(target_vertex)) continue;
auto bgl_target_vertex = graph.get_V(target_vertex);
if (from_edge[bgl_target_vertex] == default_edge) continue;
paths.push_front(
getPath(graph, bgl_start_vertex, target_vertex, bgl_target_vertex, from_edge, current_cost));
}
return paths;
}
Path getPath(
const G &graph,
V bgl_start_vertex,
int64_t target,
V bgl_target_vertex,
std::vector<E> &from_edge,
std::vector<double> ¤t_cost) {
auto current_node = bgl_target_vertex;
Path path = Path(graph[bgl_start_vertex].id, graph[current_node].id);
/* TODO(v4) add correct predecessor node */
path.push_back({target, -1, 0, current_cost[current_node], 0});
do {
E e = from_edge[current_node];
auto from = graph.source(e);
/* TODO(v4) add correct predecessor node */
path.push_back({graph[from].id, graph[e].id, graph[e].cost, current_cost[from], 0});
current_node = from;
} while (from_edge[current_node] != default_edge);
std::reverse(path.begin(), path.end());
return path;
}
void updateVertexCosts(
const G &graph,
std::vector<double> ¤t_cost,
std::vector<E> &from_edge,
std::deque<V> &dq,
V &head_vertex) {
auto out_edges = boost::out_edges(head_vertex, graph.graph);
E e;
EO_i out_i;
EO_i out_end;
V v_source, v_target;
for (boost::tie(out_i, out_end) = out_edges;
out_i != out_end; ++out_i) {
e = *out_i;
v_target = graph.target(e);
v_source = graph.source(e);
double edge_cost = graph[e].cost;
if (std::isinf(current_cost[v_target]) || current_cost[v_source] + edge_cost < current_cost[v_target]) {
current_cost[v_target] = current_cost[v_source] + edge_cost;
from_edge[v_target] = e;
if (edge_cost != 0) {
dq.push_back(v_target);
} else {
dq.push_front(v_target);
}
}
}
}
};
} // namespace functions
} // namespace pgrouting
#endif // INCLUDE_BREADTHFIRSTSEARCH_BINARYBREADTHFIRSTSEARCH_HPP_
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