public IReadOnlyList <TNode> FindReachable(TNode initialNode,
ProgressReporterCallback?progressReporter = null)
{
var visitedNodes = new HashSet <NodeWithPredecessor>(_comparer);
var initial = new NodeWithPredecessor(initialNode);
var nextNodes = new HashSet <NodeWithPredecessor>(_comparer)
{
initial
};
while (nextNodes.Count > 0)
{
progressReporter?.Invoke(visitedNodes.Count, nextNodes.Count);
visitedNodes.UnionWith(nextNodes);
var expanded = SequentialExpandTuple(nextNodes, visitedNodes).ToList();
nextNodes.Clear();
foreach (var(pred, nodes) in expanded)
{
var successorNodes = nodes.ToList();
if (successorNodes.Any())
{
nextNodes.UnionWith(successorNodes);
}
}
}
return(visitedNodes.Select(n => n.Item).ToList());
}
public IList <IPath <TNode> > FindAll2(TNode initialNode,
Func <NodeWithPredecessor, bool> targetPredicate,
ProgressReporterCallback?progressReporter = null,
int minResults = int.MaxValue)
{
if (targetPredicate == null)
{
throw new ArgumentNullException(nameof(targetPredicate), "A meaningful targetPredicate must be provided");
}
var visitedNodes = new HashSet <NodeWithPredecessor>(_comparer);
var initial = new NodeWithPredecessor(initialNode);
var nextNodes = new HashSet <NodeWithPredecessor>(_comparer)
{
initial
};
var results = new List <IPath <TNode> >();
var expander = PerformParallelSearch
? (Func <IEnumerable <NodeWithPredecessor>, IEnumerable <NodeWithPredecessor> >)(n =>
ParallelExpand(n, visitedNodes))
: n => SequentialExpand(n, visitedNodes);
if (targetPredicate(initial))
{
results.Add(new BfsPath(initialNode));
}
while (nextNodes.Count > 0)
{
progressReporter?.Invoke(visitedNodes.Count, nextNodes.Count);
visitedNodes.UnionWith(nextNodes);
var expanded = expander(nextNodes);
nextNodes = new HashSet <NodeWithPredecessor>(expanded, _comparer);
foreach (var node in nextNodes)
{
if (targetPredicate(node))
{
results.Add(new BfsPath(node));
}
}
if (results.Count >= minResults)
{
break;
}
}
return(results);
}
public IList <IPath <TNode> > FindLeafs(TNode initialNode,
ProgressReporterCallback?progressReporter = null,
int minResults = int.MaxValue)
{
var visitedNodes = new HashSet <NodeWithPredecessor>(_comparer);
var initial = new NodeWithPredecessor(initialNode);
var nextNodes = new HashSet <NodeWithPredecessor>(_comparer)
{
initial
};
var results = new List <IPath <TNode> >();
while (nextNodes.Count > 0)
{
progressReporter?.Invoke(visitedNodes.Count, nextNodes.Count);
visitedNodes.UnionWith(nextNodes);
var expanded = SequentialExpandTuple(nextNodes, visitedNodes).ToList();
nextNodes.Clear();
foreach (var(pred, nodes) in expanded)
{
var successorNodes = nodes.ToList();
if (successorNodes.Any())
{
nextNodes.UnionWith(successorNodes);
}
else
{
results.Add(new BfsPath(pred));
}
}
if (results.Count >= minResults)
{
break;
}
}
return(results);
}
public NodeWithPredecessor(TNode current, NodeWithPredecessor predecessor = null)
{
Predecessor = predecessor;
Current = current;
}
public BfsPath(NodeWithPredecessor target)
{
Target = target.Current;
Steps = target.GetHistory().Reverse().ToArray();
Length = Steps.Length - 1;
}
