///////////////////////////////////////////////////////////////////////////////
/// public _import_from_stdin
/// Construct the graph by importing the edges from the standard input.
///
///
/// @remarks The format of the data is as follows:
/// 1. The first line has an integer as the number of vertices of the graph
/// 2. Each line afterwards contains a directed edge in the graph:
/// starting point, ending point and the weight of the edge.
/// These values are separated by 'white space'.
///
///
/// @author Lukas Limacher @date 5/24/2015
///////////////////////////////////////////////////////////////////////////////
void Graph::_import_from_stdin()
{
// Read from stdin
// http://bytes.com/topic/c/answers/667481-copy-std-cin-ifstream
istream* input;
input = &cin;
// read from *input
//2. Reset the members of the class
clear();
//3. Start to read information from the input file.
/// Note the format of the data in the graph file.
//3.1 The first line has an integer as the number of vertices of the graph
*input >> m_nVertexNum;
//3.2 In the following lines, each line contains a directed edge in the graph:
/// the id of starting point, the id of ending point, the weight of the edge.
/// These values are separated by 'white space'.
int start_vertex, end_vertex;
double edge_weight;
int vertex_id = 0;
//TODO check if an EOF or NULL needs to be writte from perl at the end
// or if a delimiter character is needed!
while(*input >> start_vertex)
{
if (start_vertex == -1)
{
break;
}
*input >> end_vertex;
*input >> edge_weight;
///3.2.1 construct the vertices
BaseVertex* start_vertex_pt = get_vertex(start_vertex);
BaseVertex* end_vertex_pt = get_vertex(end_vertex);
///3.2.2 add the edge weight
//// note that the duplicate edge would overwrite the one occurring before.
m_mpEdgeCodeWeight[get_edge_code(start_vertex_pt, end_vertex_pt)] = edge_weight;
///3.2.3 update the fan-in or fan-out variables
//// Fan-in
get_vertex_set_pt(end_vertex_pt, m_mpFaninVertices)->insert(start_vertex_pt);
//// Fan-out
get_vertex_set_pt(start_vertex_pt, m_mpFanoutVertices)->insert(end_vertex_pt);
}
if(m_nVertexNum != m_vtVertices.size())
{
cerr << "The number of nodes in the graph is "<< m_vtVertices.size() << " instead of " << m_nVertexNum << endl;
exit(1);
}
m_nVertexNum = m_vtVertices.size();
m_nEdgeNum = m_mpEdgeCodeWeight.size();
}
///////////////////////////////////////////////////////////////////////////////
/// public _import_from_file
/// Construct the graph by importing the edges from the input file.
///
/// @param [in] file_name const std::string & The input graph file
///
/// This function doesn't return a value
///
/// @remarks The format of the file is as follows:
/// 1. The first line has an integer as the number of vertices of the graph
/// 2. Each line afterwards contains a directed edge in the graph:
/// starting point, ending point and the weight of the edge.
/// These values are separated by 'white space'.
///
/// @see <TODO: insert text here>
///
/// @author Yan Qi @date 5/29/2010
///////////////////////////////////////////////////////////////////////////////
void Graph::_import_from_file( const string& input_file_name )
{
const char* file_name = input_file_name.c_str();
//1. Check the validity of the file
ifstream ifs(file_name);
if (!ifs)
{
cerr << "The file " << file_name << " can not be opened!" << endl;
exit(1);
}
//2. Reset the members of the class
clear();
//3. Start to read information from the input file.
/// Note the format of the data in the graph file.
//3.1 The first line has an integer as the number of vertices of the graph
ifs >> m_nVertexNum;
//3.2 In the following lines, each line contains a directed edge in the graph:
/// the id of starting point, the id of ending point, the weight of the edge.
/// These values are separated by 'white space'.
int start_vertex, end_vertex;
double edge_weight;
int vertex_id = 0;
while(ifs >> start_vertex)
{
if (start_vertex == -1)
{
break;
}
ifs >> end_vertex;
ifs >> edge_weight;
///3.2.1 construct the vertices
BaseVertex* start_vertex_pt = get_vertex(start_vertex);
BaseVertex* end_vertex_pt = get_vertex(end_vertex);
///3.2.2 add the edge weight
//// note that the duplicate edge would overwrite the one occurring before.
m_mpEdgeCodeWeight[get_edge_code(start_vertex_pt, end_vertex_pt)] = edge_weight;
///3.2.3 update the fan-in or fan-out variables
//// Fan-in
get_vertex_set_pt(end_vertex_pt, m_mpFaninVertices)->insert(start_vertex_pt);
//// Fan-out
get_vertex_set_pt(start_vertex_pt, m_mpFanoutVertices)->insert(end_vertex_pt);
}
m_nVertexNum = m_vtVertices.size();
m_nEdgeNum = m_mpEdgeCodeWeight.size();
ifs.close();
}
double Graph::get_original_edge_weight( const BaseVertex* source, const BaseVertex* sink )
{
map<int, double>::const_iterator pos =
m_mpEdgeCodeWeight.find(get_edge_code(source, sink));
if (pos != m_mpEdgeCodeWeight.end())
{
return pos->second;
}else
{
return DISCONNECT;
}
}
