depthFirstSearch_driver.h File Reference

#include <stddef.h>
#include "c_types/pgr_edge_t.h"
#include "c_types/pgr_mst_rt.h"

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Functions
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)
	Performs exception handling and converts the results to postgres. More...

Function Documentation

do_pgr_depthFirstSearch()

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
	)

Performs exception handling and converts the results to postgres.

Precondition

log_msg is empty

notice_msg is empty

err_msg is empty

return_tuples is empty

return_count is 0

It builds the graph using the data_edges, depending on whether the graph is directed or undirected. It also converts the C types to the C++ types, such as the rootsArr to roots vector and passes these variables to the template function pgr_depthFirstSearch which calls the main function defined in the C++ Header file. It also does exception handling.

Parameters

data_edges	the set of edges from the SQL query
total_edges	the total number of edges in the SQL query
rootsArr	the array containing the root vertices
size_rootsArr	the size of the array containing the root vertices
directed	whether the graph is directed or undirected
max_depth	the maximum depth of traversal
return_tuples	the rows in the result
return_count	the count of rows in the result
log_msg	stores the log message
notice_msg	stores the notice message
err_msg	stores the error message

Returns

void

Definition at line 118 of file depthFirstSearch_driver.cpp.

                         {
    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());
    }
}

References DIRECTED, pgrouting::graph::Pgr_base_graph< G, T_V, T_E >::insert_edges(), pgassert, pgr_alloc(), pgr_depthFirstSearch(), pgr_free(), pgr_msg(), UNDIRECTED, and AssertFailedException::what().

Referenced by process().