List <string> OrderProjects(ProjectBuildGraph graph)
{
List <string> order = new List <string>();
Queue <ProjectBuildNode> noDpNodes = new Queue <ProjectBuildNode>();
var projectNodes = graph.Nodes;
// TOPOLOGICAL SORT
// find nodes with no dependencies
foreach (DictionaryEntry e in projectNodes)
{
var projectBuildNode = (ProjectBuildNode)e.Value;
if (projectBuildNode.Dependencies == 0)
{
noDpNodes.Enqueue(projectBuildNode);
}
}
while (noDpNodes.Count > 0)
{
var node = noDpNodes.Dequeue();
order.Add(node.Name);
foreach (var pbn in node.Children)
{
pbn.Dependencies--;
if (pbn.Dependencies == 0)
{
noDpNodes.Enqueue(pbn);
}
}
}
foreach (DictionaryEntry e in projectNodes)
{
var projectBuildNode = (ProjectBuildNode)e.Value;
if (projectBuildNode.Dependencies > 0)
{
return(new List <string>());
}
}
return(order);
}
ProjectBuildGraph CreateGraph(List <string> allProjects, List <Tuple <string, string> > dependencies)
{
ProjectBuildGraph graph = new ProjectBuildGraph();
foreach (var p in allProjects)
{
if (!graph.Nodes.ContainsKey(p))
{
graph.Nodes.Add(p, new ProjectBuildNode()
{
Name = p
});
}
}
foreach (var d in dependencies)
{
var node1 = (ProjectBuildNode)graph.Nodes[d.Item1];
var node2 = (ProjectBuildNode)graph.Nodes[d.Item2];
node1.Children.Add(node2);
node2.Dependencies++;
}
return(graph);
}
