//Utility to parse the Tuples to stack and retrieve as per Neighbor path
public HashSet <T> DFS <T>(GraphTask <T> graph, T start, Action <T> preVisit = null)
{
var visited = new HashSet <T>();
if (!graph.AdjacencyList.ContainsKey(start))
{
return(visited);
}
var stack = new Stack <T>();
stack.Push(start);
while (stack.Count > 0)
{
var vertex = stack.Pop();
if (visited.Contains(vertex))
{
continue;
}
if (preVisit != null)
{
preVisit(vertex);
}
visited.Add(vertex);
//Pick from the path provided remove "Reverse" incase of no sequence required
foreach (var neighbor in graph.AdjacencyList[vertex].Where(node => !visited.Contains(node)).Reverse())
{
if (!visited.Contains(neighbor))
{
stack.Push(neighbor);
}
}
}
return(visited);
}
//parse the CSV data and generate vertices & Tuple Lists - INIT Graph
public EmployeeTask(string[] csvLines)
{
employees = new Dictionary <string, Employee>();
empList = new List <Employee>();
var csvData = csvLines.Select(deli => deli.Split('\t'));
var csv = from line in csvData select(from dataLn in line select dataLn);
int top = 0;
foreach (var n in csv)
{
var p = n.GetEnumerator();
while (p.MoveNext())
{
try
{
var data = p.Current.ToString().Split(',');
if (string.IsNullOrEmpty(data[0]))
{
Console.WriteLine("ER001 : Employee ID is null or Empty in the Data File !!");
continue;
}
if (string.IsNullOrEmpty(data[1]) && top < 1)
{
top++;
}
else if (string.IsNullOrEmpty(data[1]) && top == 1)
{
Console.WriteLine("ER002 : Multiple CEOs found and Data file incorrect !!");
continue;
}
int empSalary = 0;
if (Int32.TryParse(data[2], out empSalary))
{
var empl = new Employee(data[0], data[1], empSalary);
try
{
empList.Add(empl);
if (employees.ContainsKey(empl.EmpName))
{
Console.WriteLine("ER004: Multiple Reporting Identified ");
}
else
{
employees.Add(empl.EmpName, empl);
}
}
catch (Exception e)
{
Console.WriteLine("EX001: While Adding data to the Lists ", e);
}
}
else
{
Console.WriteLine("ER003 : Employee Salary not an Integer !!");
}
}
catch (Exception e)
{
Console.WriteLine("EX002: While parsing Data ", e);
}
}
p.Dispose();
}
var empsObjs = GetVertices();
var empTuples = GetTuples();
graph = new GraphTask <Employee>(empsObjs, empTuples);
}