depthFirstSearch_driver.cpp

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/*PGR-GNU*****************************************************************
File: depthFirstSearch_driver.cpp
 
Generated with Template by:
Copyright (c) 2020 pgRouting developers
Mail: [email protected]
 
Function's developer:
Copyright (c) 2020 Ashish Kumar
Mail: [email protected]
------
 
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*/
 
#include "drivers/traversal/depthFirstSearch_driver.h"
 
#include <vector>
#include <algorithm>
#include <string>
 
#include "cpp_common/pgr_alloc.hpp"
#include "cpp_common/pgr_assert.h"
 
#include "traversal/pgr_depthFirstSearch.hpp"
 
/***********************************************************************
 *
 *   pgr_depthFirstSearch(
 *       edges_sql TEXT,
 *       root_vids ANYARRAY,
 *       max_depth BIGINT DEFAULT 9223372036854775807,
 *       directed BOOLEAN DEFAULT true
 *   );
 *
 ***********************************************************************/
 
template < class G >
std::vector < pgr_mst_rt >
pgr_depthFirstSearch(
        G &graph,
        std::vector < int64_t > roots,
        bool directed,
        int64_t max_depth) {
    std::sort(roots.begin(), roots.end());
    roots.erase(
            std::unique(roots.begin(), roots.end()),
            roots.end());
 
    pgrouting::functions::Pgr_depthFirstSearch < G > fn_depthFirstSearch;
    auto results = fn_depthFirstSearch.depthFirstSearch(graph, roots, directed, max_depth);
    return results;
}
 
void
do_pgr_depthFirstSearch(
        pgr_edge_t  *data_edges,
        size_t total_edges,
 
        int64_t *rootsArr,
        size_t size_rootsArr,
 
        bool directed,
        int64_t max_depth,
 
        pgr_mst_rt **return_tuples,
        size_t *return_count,
 
        char ** log_msg,
        char ** notice_msg,
        char ** err_msg) {
    std::ostringstream log;
    std::ostringstream err;
    std::ostringstream notice;
    try {
        pgassert(!(*log_msg));
        pgassert(!(*notice_msg));
        pgassert(!(*err_msg));
        pgassert(!(*return_tuples));
        pgassert(*return_count == 0);
 
        std::vector < int64_t > roots(rootsArr, rootsArr + size_rootsArr);
 
        std::vector < pgr_mst_rt > results;
 
        graphType gType = directed ? DIRECTED : UNDIRECTED;
 
        if (directed) {
            pgrouting::DirectedGraph digraph(gType);
            digraph.insert_edges(data_edges, total_edges);
 
            results = pgr_depthFirstSearch(
                    digraph,
                    roots,
                    directed,
                    max_depth);
        } else {
            pgrouting::UndirectedGraph undigraph(gType);
            undigraph.insert_edges(data_edges, total_edges);
 
            results = pgr_depthFirstSearch(
                    undigraph,
                    roots,
                    directed,
                    max_depth);
        }
 
        auto count = results.size();
 
        if (count == 0) {
            (*return_tuples) = NULL;
            (*return_count) = 0;
            notice << "No traversal found";
            *log_msg = pgr_msg(notice.str().c_str());
            return;
        }
 
        (*return_tuples) = pgr_alloc(count, (*return_tuples));
        for (size_t i = 0; i < count; i++) {
            *((*return_tuples) + i) = results[i];
        }
        (*return_count) = count;
 
        pgassert(*err_msg == NULL);
        *log_msg = log.str().empty()?
            *log_msg :
            pgr_msg(log.str().c_str());
        *notice_msg = notice.str().empty()?
            *notice_msg :
            pgr_msg(notice.str().c_str());
    } catch (AssertFailedException &except) {
        (*return_tuples) = pgr_free(*return_tuples);
        (*return_count) = 0;
        err << except.what();
        *err_msg = pgr_msg(err.str().c_str());
        *log_msg = pgr_msg(log.str().c_str());
    } catch (std::exception &except) {
        (*return_tuples) = pgr_free(*return_tuples);
        (*return_count) = 0;
        err << except.what();
        *err_msg = pgr_msg(err.str().c_str());
        *log_msg = pgr_msg(log.str().c_str());
    } catch(...) {
        (*return_tuples) = pgr_free(*return_tuples);
        (*return_count) = 0;
        err << "Caught unknown exception!";
        *err_msg = pgr_msg(err.str().c_str());
        *log_msg = pgr_msg(log.str().c_str());
    }
}