private void createMinimumCycleBasis()
{
org._3pq.jgrapht.Graph subgraph = new Subgraph(graph, null, null);
CSGraphT.SupportClass.SetSupport remainingEdges = new CSGraphT.SupportClass.HashSetSupport(graph.edgeSet());
//UPGRADE_TODO: Class 'java.util.HashSet' was converted to 'CSGraphT.SupportClass.HashSetSupport' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilHashSet'"
CSGraphT.SupportClass.SetSupport selectedEdges = new CSGraphT.SupportClass.HashSetSupport();
while (!(remainingEdges.Count == 0))
{
//UPGRADE_TODO: Method 'java.util.Iterator.next' was converted to 'System.Collections.IEnumerator.Current' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilIteratornext'"
Edge edge = (Edge)remainingEdges.GetEnumerator().Current;
subgraph.removeEdge(edge);
// Compute a shortest cycle through edge
System.Collections.IList path = BFSShortestPath.findPathBetween(subgraph, edge.Source, edge.Target);
path.Add(edge);
SimpleCycle cycle = new SimpleCycle(graph, path);
subgraph.addEdge(edge);
selectedEdges.Add(edge);
cycles_Renamed_Field.Insert(0, cycle);
edgeList.Insert(0, edge);
SupportClass.ICollectionSupport.RemoveAll(remainingEdges, path);
}
subgraph.removeAllEdges(selectedEdges);
// The cycles just created are already minimal, so we can start minimizing at startIndex
int startIndex = cycles_Renamed_Field.Count;
// Now we perform a breadth first traversal and build a fundamental tree base
// ("Kirchhoff base") of the remaining subgraph
System.Object currentVertex = graph.vertexSet()[0];
// We build a spanning tree as a directed graph to easily find the parent of a
// vertex in the tree. This means however that we have to create new Edge objects
// for the tree and can't just use the Edge objects of the graph, since the
// the edge in the graph might have a wrong or no direction.
DirectedGraph spanningTree = new SimpleDirectedGraph();
//UPGRADE_TODO: Class 'java.util.HashSet' was converted to 'CSGraphT.SupportClass.HashSetSupport' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilHashSet'"
CSGraphT.SupportClass.SetSupport visitedEdges = new CSGraphT.SupportClass.HashSetSupport();
// FIFO for the BFS
//UPGRADE_TODO: Class 'java.util.LinkedList' was converted to 'System.Collections.ArrayList' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilLinkedList'"
System.Collections.ArrayList vertexQueue = new System.Collections.ArrayList();
// currentVertex is the root of the spanning tree
spanningTree.addVertex(currentVertex);
vertexQueue.Insert(vertexQueue.Count, currentVertex);
// We need to remember the tree edges so we can add them at once to the
// index list for the incidence matrix
System.Collections.IList treeEdges = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
while (!(vertexQueue.Count == 0))
{
System.Object tempObject;
tempObject = vertexQueue[0];
vertexQueue.RemoveAt(0);
currentVertex = tempObject;
System.Collections.IEnumerator edges = subgraph.edgesOf(currentVertex).GetEnumerator();
//UPGRADE_TODO: Method 'java.util.Iterator.hasNext' was converted to 'System.Collections.IEnumerator.MoveNext' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilIteratorhasNext'"
while (edges.MoveNext())
{
// find a neighbour vertex of the current vertex
//UPGRADE_TODO: Method 'java.util.Iterator.next' was converted to 'System.Collections.IEnumerator.Current' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilIteratornext'"
Edge edge = (Edge)edges.Current;
if (!visitedEdges.Contains(edge))
{
// mark edge as visited
visitedEdges.Add(edge);
System.Object nextVertex = edge.oppositeVertex(currentVertex);
if (!spanningTree.containsVertex(nextVertex))
{
// tree edge
treeEdges.Add(edge);
spanningTree.addVertex(nextVertex);
// create a new (directed) Edge object (as explained above)
spanningTree.addEdge(currentVertex, nextVertex);
// add the next vertex to the BFS-FIFO
vertexQueue.Insert(vertexQueue.Count, nextVertex);
}
else
{
// non-tree edge
// This edge defines a cycle together with the edges of the spanning tree
// along the path to the root of the tree. We create a new cycle containing
// these edges (not the tree edges, but the corresponding edges in the graph)
System.Collections.IList edgesOfCycle = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
// follow the path to the root of the tree
System.Object vertex = currentVertex;
// get parent of vertex
System.Collections.IList incomingEdgesOfVertex = spanningTree.incomingEdgesOf(vertex);
System.Object parent = (incomingEdgesOfVertex.Count == 0) ? null : ((Edge)incomingEdgesOfVertex[0]).oppositeVertex(vertex);
while (parent != null)
{
// add the corresponding edge to the cycle
edgesOfCycle.Add(subgraph.getEdge(vertex, parent));
// go up the tree
vertex = parent;
// get parent of vertex
incomingEdgesOfVertex = spanningTree.incomingEdgesOf(vertex);
parent = (incomingEdgesOfVertex.Count == 0) ? null : ((Edge)incomingEdgesOfVertex[0]).oppositeVertex(vertex);
}
// do the same thing for nextVertex
vertex = nextVertex;
// get parent of vertex
incomingEdgesOfVertex = spanningTree.incomingEdgesOf(vertex);
parent = (incomingEdgesOfVertex.Count == 0) ? null : ((Edge)incomingEdgesOfVertex[0]).oppositeVertex(vertex);
while (parent != null)
{
edgesOfCycle.Add(subgraph.getEdge(vertex, parent));
vertex = parent;
// get parent of vertex
incomingEdgesOfVertex = spanningTree.incomingEdgesOf(vertex);
parent = (incomingEdgesOfVertex.Count == 0) ? null : ((Edge)incomingEdgesOfVertex[0]).oppositeVertex(vertex);
}
// finally, add the non-tree edge to the cycle
edgesOfCycle.Add(edge);
// add the edge to the index list for the incidence matrix
edgeList.Add(edge);
SimpleCycle newCycle = new SimpleCycle(graph, edgesOfCycle);
cycles_Renamed_Field.Add(newCycle);
}
}
}
}
// Add all the tree edges to the index list for the incidence matrix
SupportClass.ICollectionSupport.AddAll(edgeList, treeEdges);
edgeIndexMap = createEdgeIndexMap(edgeList);
// Now the index list is ordered: first the non-tree edges, then the tree edge.
// Moreover, since the cycles and the corresponding non-tree edge have been added
// to their lists in the same order, the incidence matrix is in upper triangular form.
// Now we can minimize the cycles created from the tree base
minimize(startIndex);
}
private void InitBlock(Subgraph enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
public BaseGraphListener(Subgraph enclosingInstance)
{
InitBlock(enclosingInstance);
}
private void InitBlock(Subgraph enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
public BaseGraphListener(Subgraph enclosingInstance)
{
InitBlock(enclosingInstance);
}
private System.Collections.IList lazyFindBiconnectedSets()
{
if (biconnectedSets_Renamed_Field == null)
{
biconnectedSets_Renamed_Field = new System.Collections.ArrayList();
IList inspector = new ConnectivityInspector(graph).connectedSets();
System.Collections.IEnumerator connectedSets = inspector.GetEnumerator();
while (connectedSets.MoveNext())
{
object obj = ((DictionaryEntry)connectedSets.Current).Value;
if (!(obj is CSGraphT.SupportClass.HashSetSupport))
continue;
CSGraphT.SupportClass.SetSupport connectedSet = (CSGraphT.SupportClass.SetSupport)obj;
if (connectedSet.Count == 1)
{
continue;
}
org._3pq.jgrapht.Graph subgraph = new Subgraph(graph, connectedSet, null);
// do DFS
// Stack for the DFS
System.Collections.ArrayList vertexStack = new System.Collections.ArrayList();
CSGraphT.SupportClass.SetSupport visitedVertices = new CSGraphT.SupportClass.HashSetSupport();
IDictionary parent = new System.Collections.Hashtable();
IList dfsVertices = new System.Collections.ArrayList();
CSGraphT.SupportClass.SetSupport treeEdges = new CSGraphT.SupportClass.HashSetSupport();
System.Object currentVertex = subgraph.vertexSet()[0];//.ToArray()[0];
vertexStack.Add(currentVertex);
visitedVertices.Add(currentVertex);
while (!(vertexStack.Count == 0))
{
currentVertex = SupportClass.StackSupport.Pop(vertexStack);
System.Object parentVertex = parent[currentVertex];
if (parentVertex != null)
{
Edge edge = subgraph.getEdge(parentVertex, currentVertex);
// tree edge
treeEdges.Add(edge);
}
visitedVertices.Add(currentVertex);
dfsVertices.Add(currentVertex);
System.Collections.IEnumerator edges = subgraph.edgesOf(currentVertex).GetEnumerator();
while (edges.MoveNext())
{
// find a neighbour vertex of the current vertex
Edge edge = (Edge)edges.Current;
if (!treeEdges.Contains(edge))
{
System.Object nextVertex = edge.oppositeVertex(currentVertex);
if (!visitedVertices.Contains(nextVertex))
{
vertexStack.Add(nextVertex);
parent[nextVertex] = currentVertex;
}
else
{
// non-tree edge
}
}
}
}
// DFS is finished. Now create the auxiliary graph h
// Add all the tree edges as vertices in h
SimpleGraph h = new SimpleGraph();
h.addAllVertices(treeEdges);
visitedVertices.Clear();
CSGraphT.SupportClass.SetSupport connected = new CSGraphT.SupportClass.HashSetSupport();
for (System.Collections.IEnumerator it = dfsVertices.GetEnumerator(); it.MoveNext(); )
{
System.Object v = it.Current;
visitedVertices.Add(v);
// find all adjacent non-tree edges
for (System.Collections.IEnumerator adjacentEdges = subgraph.edgesOf(v).GetEnumerator(); adjacentEdges.MoveNext();)
{
Edge l = (Edge)adjacentEdges.Current;
if (!treeEdges.Contains(l))
{
h.addVertex(l);
System.Object u = l.oppositeVertex(v);
// we need to check if (u,v) is a back-edge
if (!visitedVertices.Contains(u))
{
while (u != v)
{
System.Object pu = parent[u];
Edge f = subgraph.getEdge(u, pu);
h.addEdge(f, l);
if (!connected.Contains(f))
{
connected.Add(f);
u = pu;
}
else
{
u = v;
}
}
}
}
}
}
ConnectivityInspector connectivityInspector = new ConnectivityInspector(h);
biconnectedSets_Renamed_Field.Add(connectivityInspector.connectedSets());
}
}
return biconnectedSets_Renamed_Field;
}
