public void ReverseEdges_Throws()
{
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
// ReSharper disable once AssignNullToNotNullAttribute
Assert.Throws <ArgumentNullException>(
() => EdgeExtensions.ReverseEdges <int, Edge <int> >(null));
}
public static TryFunc <TVertex, IEnumerable <TEdge> > TreeCyclePoppingRandom <TVertex, TEdge>(
this
IVertexListGraph <TVertex, TEdge> visitedGraph,
TVertex root,
IMarkovEdgeChain <TVertex, TEdge> edgeChain)
where TEdge : IEdge <TVertex>
{
Contract.Requires(visitedGraph != null);
Contract.Requires(root != null);
Contract.Requires(visitedGraph.ContainsVertex(root));
Contract.Ensures(Contract.Result <TryFunc <TVertex, IEnumerable <TEdge> > >() != null);
var algo = new CyclePoppingRandomTreeAlgorithm <TVertex, TEdge>(visitedGraph, edgeChain);
var predecessorRecorder = new VertexPredecessorRecorderObserver <TVertex, TEdge>();
using (predecessorRecorder.Attach(algo))
algo.Compute(root);
var predecessors = predecessorRecorder.VertexPredecessors;
return(delegate(TVertex v, out IEnumerable <TEdge> edges)
{
return EdgeExtensions.TryGetPath(predecessors, v, out edges);
});
}
/// <summary>
/// Computes a depth first tree.
/// </summary>
/// <typeparam name="TVertex">The type of the vertex.</typeparam>
/// <typeparam name="TEdge">The type of the edge.</typeparam>
/// <param name="visitedGraph">The visited graph.</param>
/// <param name="root">The root.</param>
/// <returns></returns>
public static TryFunc <TVertex, IEnumerable <TEdge> > TreeDepthFirstSearch <TVertex, TEdge>(
#if !NET20
this
#endif
IVertexListGraph <TVertex, TEdge> visitedGraph,
TVertex root)
where TEdge : IEdge <TVertex>
{
//Contract.Requires(visitedGraph != null);
//Contract.Requires(root != null);
//Contract.Requires(visitedGraph.ContainsVertex(root));
//Contract.Ensures(//Contract.Result<TryFunc<TVertex, IEnumerable<TEdge>>>() != null);
var algo = new DepthFirstSearchAlgorithm <TVertex, TEdge>(visitedGraph);
var predecessorRecorder = new VertexPredecessorRecorderObserver <TVertex, TEdge>();
using (predecessorRecorder.Attach(algo))
algo.Compute(root);
var predecessors = predecessorRecorder.VertexPredecessors;
return(delegate(TVertex v, out IEnumerable <TEdge> edges)
{
return EdgeExtensions.TryGetPath(predecessors, v, out edges);
});
}
public static TryFunc <TVertex, IEnumerable <TEdge> > ShortestPathsAStar <TVertex, TEdge>(
#if !NET20
this
#endif
IVertexAndEdgeListGraph <TVertex, TEdge> visitedGraph,
Func <TEdge, double> edgeWeights,
Func <TVertex, double> costHeuristic,
TVertex source
)
where TEdge : IEdge <TVertex>
{
//Contract.Requires(visitedGraph != null);
//Contract.Requires(edgeWeights != null);
//Contract.Requires(costHeuristic != null);
//Contract.Requires(source != null);
var algorithm = new AStarShortestPathAlgorithm <TVertex, TEdge>(visitedGraph, edgeWeights, costHeuristic);
var predecessorRecorder = new VertexPredecessorRecorderObserver <TVertex, TEdge>();
using (predecessorRecorder.Attach(algorithm))
algorithm.Compute(source);
var predecessors = predecessorRecorder.VertexPredecessors;
return(delegate(TVertex v, out IEnumerable <TEdge> edges)
{
return EdgeExtensions.TryGetPath(predecessors, v, out edges);
});
}
} // {return entryEdges.Count;}}
public Frame(Dictionary <Edge, FrameWall> frameWalls)
{
foreach (Edge edge in EdgeExtensions.AllEdges())
{
if (!frameWalls.ContainsKey(edge))
{
throw new ArgumentException("Missing framewall for an edge");
}
}
if (frameWalls[Edge.Left].Length != frameWalls[Edge.Right].Length)
{
throw new ArgumentException("Parallel vertical framewalls have different Lengths");
}
if (frameWalls[Edge.Bottom].Length != frameWalls[Edge.Top].Length)
{
throw new ArgumentException("Parallel horizontal framewalls have different Lengths");
}
FrameWalls = frameWalls;
Width = frameWalls[Edge.Bottom].Length;
Height = frameWalls[Edge.Left].Length;
EntryEdges = new List <Edge>();
foreach (KeyValuePair <Edge, FrameWall> item in frameWalls)
{
if (item.Value.HasEntry)
{
EntryEdges.Add(item.Key);
}
}
EntryCount = EntryEdges.Count;
}
//my edge
public FrameRange FrameRangeOff(Edge edge)
{
FrameWall wall = FrameWalls[edge];
if (!wall.HasEntry)
{
return(FrameRange.Empty);
}
Dictionary <Edge, FrameWallRange> frameWallRanges = new Dictionary <Edge, FrameWallRange>();
frameWallRanges[edge.Opposite()] = new FrameWallRange(
new FrameWall(0, wall.Entry, 0),
new FrameWall(int.MaxValue, wall.Entry, int.MaxValue)
);
foreach (Edge missingEdge in EdgeExtensions.AllEdges())
{
if (!frameWallRanges.ContainsKey(missingEdge))
{
frameWallRanges[missingEdge] = FrameWallRange.All;
}
}
return(new FrameRange(frameWallRanges));
}
public IEnumerable <IEnumerable <TEdge> > HoffmanPavleyRankedShortestPath <TVertex, TEdge>(
[PexAssumeNotNull] IBidirectionalGraph <TVertex, TEdge> g,
[PexAssumeNotNull] Dictionary <TEdge, double> edgeWeights,
TVertex rootVertex,
TVertex goalVertex,
int pathCount
)
where TEdge : IEdge <TVertex>
{
//GraphConsoleSerializer.DisplayGraph((IEdgeListGraph<TVertex, TEdge>)g);
PexAssert.TrueForAll(g.Edges, edgeWeights.ContainsKey);
var target = new HoffmanPavleyRankedShortestPathAlgorithm <TVertex, TEdge>(g, e => edgeWeights[e]);
target.ShortestPathCount = pathCount;
target.Compute(rootVertex, goalVertex);
double lastWeight = double.MinValue;
foreach (var path in target.ComputedShortestPaths)
{
Console.WriteLine("path: {0}", Enumerable.Sum(path, e => edgeWeights[e]));
double weight = Enumerable.Sum(path, e => edgeWeights[e]);
Assert.IsTrue(lastWeight <= weight, "{0} <= {1}", lastWeight, weight);
Assert.AreEqual(rootVertex, Enumerable.First(path).Source);
Assert.AreEqual(goalVertex, Enumerable.Last(path).Target);
Assert.IsTrue(EdgeExtensions.IsPathWithoutCycles <TVertex, TEdge>(path));
lastWeight = weight;
}
return(target.ComputedShortestPaths);
}
private void EnqueueFirstShortestPath(
IQueue <DeviationPath> queue,
IDictionary <TVertex, TEdge> successors,
IDictionary <TVertex, double> distances,
TVertex root)
{
Contract.Requires(queue != null);
Contract.Requires(queue.Count == 0);
Contract.Requires(successors != null);
Contract.Requires(distances != null);
Contract.Requires(root != null);
var path = new List <TEdge>();
AppendShortestPath(
path,
successors,
root);
if (path.Count == 0)
{
return; // unreachable vertices
}
if (!EdgeExtensions.HasCycles <TVertex, TEdge>(path))
{
this.AddComputedShortestPath(path);
}
// create deviation paths
this.EnqueueDeviationPaths(
queue,
root,
distances,
path.ToArray(),
0);
}
public void TarjanOfflineLeastCommonAncestorAlgorithm <TVertex, TEdge>(
[PexAssumeNotNull] IVertexListGraph <TVertex, TEdge> g,
[PexAssumeNotNull] TVertex root,
[PexAssumeNotNull] SEquatableEdge <TVertex>[] pairs
)
where TEdge : IEdge <TVertex>
{
var lca = g.OfflineLeastCommonAncestorTarjan(root, pairs);
var predecessors = new VertexPredecessorRecorderObserver <TVertex, TEdge>();
var dfs = new DepthFirstSearchAlgorithm <TVertex, TEdge>(g);
using (predecessors.Attach(dfs))
dfs.Compute(root);
TVertex ancestor;
foreach (var pair in pairs)
{
if (lca(pair, out ancestor))
{
Assert.IsTrue(EdgeExtensions.IsPredecessor(predecessors.VertexPredecessors, root, pair.Source));
Assert.IsTrue(EdgeExtensions.IsPredecessor(predecessors.VertexPredecessors, root, pair.Target));
}
}
}
public static TryFunc <TVertex, IEnumerable <TEdge> > ShortestPathsDijkstra <TVertex, TEdge>(
#if !NET20
this
#endif
IUndirectedGraph <TVertex, TEdge> visitedGraph,
Func <TEdge, double> edgeWeights,
TVertex source
)
where TEdge : IEdge <TVertex>
{
Contract.Requires(visitedGraph != null);
Contract.Requires(edgeWeights != null);
Contract.Requires(source != null);
var algorithm = new UndirectedDijkstraShortestPathAlgorithm <TVertex, TEdge>(visitedGraph, edgeWeights);
var predecessorRecorder = new UndirectedVertexPredecessorRecorderObserver <TVertex, TEdge>();
using (predecessorRecorder.Attach(algorithm))
algorithm.Compute(source);
var predecessors = predecessorRecorder.VertexPredecessors;
return(delegate(TVertex v, out IEnumerable <TEdge> edges)
{
return EdgeExtensions.TryGetPath(predecessors, v, out edges);
});
}
public override string ToString()
{
string str = "";
foreach (Edge edge in EdgeExtensions.AllEdges())
{
str += edge + ": " + FrameWalls[edge] + "\n";
}
str = str.Substring(0, str.Length - 1);
return(str);
}
public FrameRange(Dictionary <Edge, FrameWallRange> frameWallRanges)
{
foreach (Edge edge in EdgeExtensions.AllEdges())
{
if (!frameWallRanges.ContainsKey(edge))
{
throw new ArgumentException("Missing framewall range for an edge");
}
}
FrameWallRanges = frameWallRanges;
}
private void EnqueueDeviationPaths(
IQueue <DeviationPath> queue,
TVertex root,
IDictionary <TVertex, TEdge> successors,
IDictionary <TVertex, double> distances,
TEdge[] path,
int startEdge
)
{
Contract.Requires(queue != null);
Contract.Requires(root != null);
Contract.Requires(successors != null);
Contract.Requires(distances != null);
Contract.Requires(path != null);
Contract.Requires(EdgeExtensions.IsAdjacent <TVertex, TEdge>(path[0], root));
Contract.Requires(0 <= startEdge && startEdge < path.Length);
TVertex previousVertex = root;
double previousWeight = 0;
var pathVertices = new Dictionary <TVertex, int>(path.Length);
for (int iedge = 0; iedge < path.Length; ++iedge)
{
var edge = path[iedge];
if (iedge >= startEdge)
{
this.EnqueueDeviationPaths(
queue,
distances,
path,
iedge,
previousVertex,
previousWeight,
pathVertices
);
}
// update counter
previousVertex = edge.Target;
previousWeight += this.edgeWeights(edge);
// detection of loops
if (iedge == 0)
{
pathVertices[edge.Source] = 0;
}
// we should really allow only one key
if (pathVertices.ContainsKey(edge.Target))
{
break;
}
pathVertices[edge.Target] = 0;
}
}
private void EnqueueDeviationPaths(
IQueue <DeviationPath> queue,
IDictionary <TVertex, double> distances,
TEdge[] path,
int iedge,
TVertex previousVertex,
double previousWeight,
Dictionary <TVertex, int> pathVertices
)
{
Contract.Requires(queue != null);
Contract.Requires(distances != null);
Contract.Requires(path != null);
var edge = path[iedge];
foreach (var deviationEdge in this.VisitedGraph.OutEdges(previousVertex))
{
// skip self edges,
// skip equal edges,
if (deviationEdge.Equals(edge) ||
EdgeExtensions.IsSelfEdge <TVertex, TEdge>(deviationEdge))
{
continue;
}
// any edge obviously creating a loop
var atarget = deviationEdge.Target;
double adistance;
if (distances.TryGetValue(atarget, out adistance))
{
var deviationWeight =
this.DistanceRelaxer.Combine(
previousWeight,
this.DistanceRelaxer.Combine(
this.edgeWeights(deviationEdge),
adistance
)
);
var deviation = new DeviationPath(
path,
iedge,
deviationEdge,
deviationWeight
);
queue.Enqueue(deviation);
}
}
}
public IEnumerable <IEnumerable <TEdge> > AllPaths()
{
List <IEnumerable <TEdge> > es = new List <IEnumerable <TEdge> >();
foreach (var v in this.EndPathVertices)
{
IEnumerable <TEdge> path;
if (EdgeExtensions.TryGetPath(this.vertexPredecessors, v, out path))
{
es.Add(path);
}
}
return(es);
}
public bool RemoveEdge(TEdge edge)
{
bool removed = this._adjacentEdges[edge.Source].Remove(edge);
if (removed)
{
if (!EdgeExtensions.IsSelfEdge <TVertex, TEdge>(edge))
{
this._adjacentEdges[edge.Target].Remove(edge);
}
this.EdgeCount--;
Contract.Assert(this.EdgeCount >= 0);
this.OnEdgeRemoved(edge);
return(true);
}
else
{
return(false);
}
}
protected override void InternalCompute()
{
var cancelManager = this.Services.CancelManager;
TVertex root;
if (!this.TryGetRootVertex(out root))
{
throw new InvalidOperationException("root vertex not set");
}
if (this.pairs == null)
{
throw new InvalidOperationException("pairs not set");
}
var gpair = GraphExtensions.ToAdjacencyGraph(this.pairs);
var disjointSet = new ForestDisjointSet <TVertex>();
var vancestors = new Dictionary <TVertex, TVertex>();
var dfs = new DepthFirstSearchAlgorithm <TVertex, TEdge>(this, this.VisitedGraph, new Dictionary <TVertex, GraphColor>(this.VisitedGraph.VertexCount));
dfs.InitializeVertex += v => disjointSet.MakeSet(v);
dfs.DiscoverVertex += v => vancestors[v] = v;
dfs.TreeEdge += edge =>
{
disjointSet.Union(edge.Source, edge.Target);
vancestors[disjointSet.FindSet(edge.Source)] = edge.Source;
};
dfs.FinishVertex += v =>
{
foreach (var e in gpair.OutEdges(v))
{
if (dfs.VertexColors[e.Target] == GraphColor.Black)
{
this.ancestors[EdgeExtensions.ToVertexPair <TVertex, SEquatableEdge <TVertex> >(e)] = vancestors[disjointSet.FindSet(e.Target)];
}
}
};
// go!
dfs.Compute(root);
}
public void ReverseEdges()
{
CollectionAssert.IsEmpty(EdgeExtensions.ReverseEdges <int, Edge <int> >(Enumerable.Empty <Edge <int> >()));
var edge1 = new Edge <int>(1, 2);
CollectionAssert.AreEqual(
new[] { new SReversedEdge <int, Edge <int> >(edge1) },
EdgeExtensions.ReverseEdges <int, Edge <int> >(new[] { edge1 }));
var edge2 = new Edge <int>(2, 2);
var edge3 = new Edge <int>(3, 1);
CollectionAssert.AreEqual(
new[]
{
new SReversedEdge <int, Edge <int> >(edge1),
new SReversedEdge <int, Edge <int> >(edge2),
new SReversedEdge <int, Edge <int> >(edge3)
},
EdgeExtensions.ReverseEdges <int, Edge <int> >(new[] { edge1, edge2, edge3 }));
}
public bool AddVerticesAndEdge(TEdge edge)
{
var sourceEdges = this.AddAndReturnEdges(edge.Source);
var targetEdges = this.AddAndReturnEdges(edge.Target);
if (!this.AllowParallelEdges)
{
if (this.ContainsEdgeBetweenVertices(sourceEdges, edge))
{
return(false);
}
}
sourceEdges.Add(edge);
if (!EdgeExtensions.IsSelfEdge <TVertex, TEdge>(edge))
{
targetEdges.Add(edge);
}
this.EdgeCount++;
this.OnEdgeAdded(edge);
return(true);
}
public bool AddEdge(TEdge edge)
{
var sourceEdges = _adjacentEdges[edge.Source];
if (!AllowParallelEdges)
{
if (ContainsEdgeBetweenVertices(sourceEdges, edge))
{
return(false);
}
}
sourceEdges.Add(edge);
if (!EdgeExtensions.IsSelfEdge <TVertex, TEdge>(edge))
{
var targetEdges = _adjacentEdges[edge.Target];
targetEdges.Add(edge);
}
EdgeCount++;
OnEdgeAdded(edge);
return(true);
}
protected override void InternalCompute()
{
var cancelManager = this.Services.CancelManager;
TVertex root;
if (!this.TryGetRootVertex(out root))
{
throw new InvalidOperationException("root vertex not set");
}
TVertex goal;
if (!this.TryGetGoalVertex(out goal))
{
throw new InvalidOperationException("goal vertex not set");
}
// start by building the minimum tree starting from the goal vertex.
IDictionary <TVertex, TEdge> successors;
IDictionary <TVertex, double> distances;
this.ComputeMinimumTree(goal, out successors, out distances);
if (cancelManager.IsCancelling)
{
return;
}
var queue = new FibonacciQueue <DeviationPath, double>(dp => dp.Weight);
var vertexCount = this.VisitedGraph.VertexCount;
// first shortest path
this.EnqueueFirstShortestPath(queue, successors, distances, root);
while (queue.Count > 0 &&
this.ComputedShortestPathCount < this.ShortestPathCount)
{
if (cancelManager.IsCancelling)
{
return;
}
var deviation = queue.Dequeue();
// turn into path
var path = new List <TEdge>();
for (int i = 0; i < deviation.DeviationIndex; ++i)
{
path.Add(deviation.ParentPath[i]);
}
path.Add(deviation.DeviationEdge);
int startEdge = path.Count;
this.AppendShortestPath(path, successors, deviation.DeviationEdge.Target);
Contract.Assert(deviation.Weight == Enumerable.Sum(path, e => edgeWeights(e)));
Contract.Assert(path.Count > 0);
// add to list if loopless
if (!EdgeExtensions.HasCycles <TVertex, TEdge>(path))
{
this.AddComputedShortestPath(path);
}
// append new deviation paths
if (path.Count < vertexCount)
{
this.EnqueueDeviationPaths(
queue,
root,
successors,
distances,
path.ToArray(),
startEdge
);
}
}
}
public XUndirectedGraph(bool allowParallelEdges) : this(allowParallelEdges, EdgeExtensions.GetUndirectedVertexEquality <TVertex, TEdge>())
{
AllowParallelEdges = allowParallelEdges;
}
public bool TryGetPath(TVertex vertex, out IEnumerable <TEdge> path)
{
return(EdgeExtensions.TryGetPath(this.VertexPredecessors, vertex, out path));
}
protected override void InternalCompute()
{
TVertex root;
if (!this.TryGetRootVertex(out root))
{
throw new InvalidOperationException("root vertex not set");
}
TVertex goal;
if (!this.TryGetGoalVertex(out goal))
{
throw new InvalidOperationException("goal vertex not set");
}
// little shortcut
if (root.Equals(goal))
{
this.OnGoalReached();
return; // found it
}
var cancelManager = this.Services.CancelManager;
var open = new BinaryHeap <double, TVertex>(this.distanceRelaxer.Compare);
var operators = new Dictionary <TEdge, GraphColor>();
var g = this.VisitedGraph;
// (1) Place the initial node on Open, with all its operators marked unused.
open.Add(0, root);
foreach (var edge in g.OutEdges(root))
{
operators.Add(edge, GraphColor.White);
}
while (open.Count > 0)
{
if (cancelManager.IsCancelling)
{
return;
}
// (3) Else, choose an Open node n of lowest cost for expansion
var entry = open.RemoveMinimum();
var cost = entry.Key;
var n = entry.Value;
// (4) if node n is a goal node, terminate with success
if (n.Equals(goal))
{
this.OnGoalReached();
return;
}
// (5) else, expand node n,
// genarting all successors n' reachable via unused legal operators
// compute their cost and delete node n
foreach (var edge in g.OutEdges(n))
{
if (EdgeExtensions.IsSelfEdge <TVertex, TEdge>(edge))
{
continue; // skip self-edges
}
GraphColor edgeColor;
bool hasColor = operators.TryGetValue(edge, out edgeColor);
if (!hasColor || edgeColor == GraphColor.White)
{
var weight = this.edgeWeights(edge);
var ncost = this.distanceRelaxer.Combine(cost, weight);
// (7) foreach neighboring node of n' mark the operator from n to n' as used
// (8) for each node n', if there is no copy of n' in open addit
// else save on open on the copy of n' with lowest cose. Mark as used all operators
// mak as used in any of the copies
operators[edge] = GraphColor.Gray;
if (open.MinimumUpdate(ncost, edge.Target))
{
this.OnTreeEdge(edge);
}
}
else if (hasColor)
{
Contract.Assume(edgeColor == GraphColor.Gray);
// edge already seen, remove it
operators.Remove(edge);
}
}
#if DEBUG
this.operatorMaxCount = Math.Max(this.operatorMaxCount, operators.Count);
#endif
// (6) in a directed graph, generate each predecessor node n via an unused operator
// and create dummy nodes for each with costs of infinity
foreach (var edge in g.InEdges(n))
{
GraphColor edgeColor;
if (operators.TryGetValue(edge, out edgeColor) &&
edgeColor == GraphColor.Gray)
{
// delete node n
operators.Remove(edge);
}
}
}
}
protected override void InternalCompute()
{
var cancelManager = this.Services.CancelManager;
// matrix i,j -> path
this.data.Clear();
var vertices = this.VisitedGraph.Vertices;
var edges = this.VisitedGraph.Edges;
// prepare the matrix with initial costs
// walk each edge and add entry in cost dictionary
foreach (var edge in edges)
{
var ij = EdgeExtensions.ToVertexPair <TVertex, TEdge>(edge);
var cost = this.weights(edge);
VertexData value;
if (!data.TryGetValue(ij, out value))
{
data[ij] = new VertexData(cost, edge);
}
else if (cost < value.Distance)
{
data[ij] = new VertexData(cost, edge);
}
}
if (cancelManager.IsCancelling)
{
return;
}
// walk each vertices and make sure cost self-cost 0
foreach (var v in vertices)
{
data[new SEquatableEdge <TVertex>(v, v)] = new VertexData(0, default(TEdge));
}
if (cancelManager.IsCancelling)
{
return;
}
// iterate k, i, j
foreach (var vk in vertices)
{
if (cancelManager.IsCancelling)
{
return;
}
foreach (var vi in vertices)
{
var ik = new SEquatableEdge <TVertex>(vi, vk);
VertexData pathik;
if (data.TryGetValue(ik, out pathik))
{
foreach (var vj in vertices)
{
var kj = new SEquatableEdge <TVertex>(vk, vj);
VertexData pathkj;
if (data.TryGetValue(kj, out pathkj))
{
double combined = this.distanceRelaxer.Combine(pathik.Distance, pathkj.Distance);
var ij = new SEquatableEdge <TVertex>(vi, vj);
VertexData pathij;
if (data.TryGetValue(ij, out pathij))
{
if (this.distanceRelaxer.Compare(combined, pathij.Distance) < 0)
{
data[ij] = new VertexData(combined, vk);
}
}
else
{
data[ij] = new VertexData(combined, vk);
}
}
}
}
}
}
// check negative cycles
foreach (var vi in vertices)
{
var ii = new SEquatableEdge <TVertex>(vi, vi);
VertexData value;
if (data.TryGetValue(ii, out value) &&
value.Distance < 0)
{
throw new NegativeCycleGraphException();
}
}
}
/// <summary>
/// Edits the items in the database.
/// </summary>
/// <param name="serviceProvider">The application service provider.</param>
/// <param name="token">The cancellation token for the task.</param>
public async Task EditAsync(IServiceProvider serviceProvider, CancellationToken token)
{
// Check if there weren't any valid items found.
if (Items == null)
{
// Throw an exception.
throw new TaskException("No valid items could be found with the provided data.");
}
// Check if the exception item should be shown.
var showExceptionItem = Items.Count() > 1;
// Get the total number of batches.
var count = Math.Ceiling((double)Items.Count() / ApplicationDbContext.BatchSize);
// Go over each batch.
for (var index = 0; index < count; index++)
{
// Check if the cancellation was requested.
if (token.IsCancellationRequested)
{
// Break.
break;
}
// Get the items in the current batch.
var batchItems = Items
.Skip(index * ApplicationDbContext.BatchSize)
.Take(ApplicationDbContext.BatchSize);
// Get the IDs of the items in the current batch.
var batchIds = batchItems
.Where(item => !string.IsNullOrEmpty(item.Id))
.Select(item => item.Id);
// Get the IDs of the related entities that appear in the current batch.
var batchDatabaseIds = batchItems
.Where(item => item.DatabaseEdges != null)
.Select(item => item.DatabaseEdges)
.SelectMany(item => item)
.Where(item => item.Database != null)
.Select(item => item.Database)
.Where(item => !string.IsNullOrEmpty(item.Id))
.Select(item => item.Id)
.Distinct();
var batchDatabaseEdgeFieldIds = batchItems
.Where(item => item.DatabaseEdgeFieldEdges != null)
.Select(item => item.DatabaseEdgeFieldEdges)
.SelectMany(item => item)
.Where(item => item.DatabaseEdgeField != null)
.Select(item => item.DatabaseEdgeField)
.Where(item => !string.IsNullOrEmpty(item.Id))
.Select(item => item.Id)
.Distinct();
var batchNodeIds = batchItems
.Where(item => item.EdgeNodes != null)
.Select(item => item.EdgeNodes)
.SelectMany(item => item)
.Where(item => item.Node != null)
.Select(item => item.Node)
.Where(item => !string.IsNullOrEmpty(item.Id))
.Select(item => item.Id)
.Distinct();
// Define the list of items to get.
var edges = new List <Edge>();
var databases = new List <Database>();
var databaseEdgeFields = new List <DatabaseEdgeField>();
var nodes = new List <Node>();
// Use a new scope.
using (var scope = serviceProvider.CreateScope())
{
// Use a new context instance.
using var context = scope.ServiceProvider.GetRequiredService <ApplicationDbContext>();
// Get the items with the provided IDs.
var items = context.Edges
.Where(item => !item.DatabaseEdges.Any(item1 => item1.Database.DatabaseType.Name == "Generic"))
.Where(item => batchIds.Contains(item.Id));
// Check if there were no items found.
if (items == null || !items.Any())
{
// Continue.
continue;
}
// Get the items found.
edges = items
.ToList();
// Get the related entities that appear in the current batch.
databaseEdgeFields = context.DatabaseEdgeFields
.Where(item => item.Database.DatabaseType.Name != "Generic")
.Where(item => batchDatabaseEdgeFieldIds.Contains(item.Id))
.ToList();
databases = context.Databases
.Where(item => item.DatabaseType.Name != "Generic")
.Where(item => batchDatabaseIds.Contains(item.Id))
.Concat(context.DatabaseEdgeFields
.Where(item => item.Database.DatabaseType.Name != "Generic")
.Where(item => batchDatabaseEdgeFieldIds.Contains(item.Id))
.Select(item => item.Database))
.Distinct()
.ToList();
nodes = context.Nodes
.Where(item => !item.DatabaseNodes.Any(item1 => item1.Database.DatabaseType.Name == "Generic"))
.Where(item => batchNodeIds.Contains(item.Id))
.ToList();
}
// Get the IDs of the items.
var edgeIds = edges
.Select(item => item.Id);
// Save the items to edit.
var edgesToEdit = new List <Edge>();
// Go over each of the valid items.
foreach (var batchItem in batchItems)
{
// Get the corresponding item.
var edge = edges
.FirstOrDefault(item => batchItem.Id == item.Id);
// Check if there was no item found.
if (edge == null)
{
// Continue.
continue;
}
// Check if there were no edge nodes provided.
if (batchItem.EdgeNodes == null || !batchItem.EdgeNodes.Any())
{
// Throw an exception.
throw new TaskException("There were no edge nodes provided.", showExceptionItem, batchItem);
}
// Get the edge nodes.
var edgeNodes = batchItem.EdgeNodes
.Where(item => item.Node != null)
.Where(item => !string.IsNullOrEmpty(item.Node.Id))
.Where(item => item.Type == "Source" || item.Type == "Target")
.Select(item => (item.Node.Id, item.Type))
.Distinct()
.Where(item => nodes.Any(item1 => item1.Id == item.Item1))
.Select(item => new EdgeNode
{
NodeId = item.Item1,
Type = EnumerationExtensions.GetEnumerationValue <EdgeNodeType>(item.Item2)
});
// Check if there were no edge nodes found.
if (edgeNodes == null || !edgeNodes.Any(item => item.Type == EdgeNodeType.Source) || !edgeNodes.Any(item => item.Type == EdgeNodeType.Target))
{
// Throw an exception.
throw new TaskException("There were no edge nodes found.", showExceptionItem, batchItem);
}
// Check if there were no database edges or database edge field edges provided.
if ((batchItem.DatabaseEdges == null || !batchItem.DatabaseEdges.Any()) && (batchItem.DatabaseEdgeFieldEdges == null || !batchItem.DatabaseEdgeFieldEdges.Any()))
{
// Throw an exception.
throw new TaskException("There were no database edges or database edge field edges provided.", showExceptionItem, batchItem);
}
// Get the database edge field edges.
var databaseEdgeFieldEdges = batchItem.DatabaseEdgeFieldEdges != null?
batchItem.DatabaseEdgeFieldEdges
.Where(item => item.DatabaseEdgeField != null)
.Where(item => !string.IsNullOrEmpty(item.DatabaseEdgeField.Id))
.Where(item => !string.IsNullOrEmpty(item.Value))
.Select(item => (item.DatabaseEdgeField.Id, item.Value))
.Distinct()
.Where(item => databaseEdgeFields.Any(item1 => item1.Id == item.Item1))
.Select(item => new DatabaseEdgeFieldEdge
{
DatabaseEdgeFieldId = item.Item1,
Value = item.Item2
}) :
Enumerable.Empty <DatabaseEdgeFieldEdge>();
// Get the database edges.
var databaseEdgeFieldIds = databaseEdgeFieldEdges
.Select(item => item.DatabaseEdgeFieldId)
.Distinct();
var currentDatabaseEdgeFields = databaseEdgeFields
.Where(item => databaseEdgeFieldIds.Contains(item.Id));
var databaseEdges = batchItem.DatabaseEdges != null?
batchItem.DatabaseEdges
.Where(item => item.Database != null)
.Where(item => !string.IsNullOrEmpty(item.Database.Id))
.Select(item => item.Database.Id)
.Concat(currentDatabaseEdgeFields
.Select(item => item.Database.Id))
.Distinct()
.Where(item => databases.Any(item1 => item1.Id == item))
.Select(item => new DatabaseEdge
{
DatabaseId = item,
}) :
Enumerable.Empty <DatabaseEdge>();
// Check if there were no database edges found.
if (databaseEdges == null || !databaseEdges.Any())
{
// Throw an exception.
throw new TaskException("There were no database edges found.", showExceptionItem, batchItem);
}
// Update the edge.
edge.Name = string.Concat(nodes.First(item => item.Id == edgeNodes.First(item => item.Type == EdgeNodeType.Source).NodeId).Name, " - ", nodes.First(item => item.Id == edgeNodes.First(item => item.Type == EdgeNodeType.Target).NodeId).Name);
edge.Description = batchItem.Description;
edge.EdgeNodes = new List <EdgeNode>
{
edgeNodes.First(item => item.Type == EdgeNodeType.Source),
edgeNodes.First(item => item.Type == EdgeNodeType.Target)
};
edge.DatabaseEdgeFieldEdges = databaseEdgeFieldEdges.ToList();
edge.DatabaseEdges = databaseEdges.ToList();
// Add the edge to the list.
edgesToEdit.Add(edge);
}
// Delete the dependent entities.
await EdgeExtensions.DeleteDependentAnalysesAsync(edgeIds, serviceProvider, token);
await EdgeExtensions.DeleteDependentNetworksAsync(edgeIds, serviceProvider, token);
// Delete the related entities.
await EdgeExtensions.DeleteRelatedEntitiesAsync <EdgeNode>(edgeIds, serviceProvider, token);
await EdgeExtensions.DeleteRelatedEntitiesAsync <DatabaseEdgeFieldEdge>(edgeIds, serviceProvider, token);
await EdgeExtensions.DeleteRelatedEntitiesAsync <DatabaseEdge>(edgeIds, serviceProvider, token);
// Update the items.
await IEnumerableExtensions.EditAsync(edgesToEdit, serviceProvider, token);
}
}
/// <summary>
/// Deletes the items from the database.
/// </summary>
/// <param name="serviceProvider">The application service provider.</param>
/// <param name="token">The cancellation token for the task.</param>
public async Task DeleteAsync(IServiceProvider serviceProvider, CancellationToken token)
{
// Check if there weren't any valid items found.
if (Items == null)
{
// Throw an exception.
throw new TaskException("No valid items could be found with the provided data.");
}
// Get the total number of batches.
var count = Math.Ceiling((double)Items.Count() / ApplicationDbContext.BatchSize);
// Go over each batch.
for (var index = 0; index < count; index++)
{
// Check if the cancellation was requested.
if (token.IsCancellationRequested)
{
// Break.
break;
}
// Get the items in the current batch.
var batchItems = Items
.Skip(index * ApplicationDbContext.BatchSize)
.Take(ApplicationDbContext.BatchSize);
// Get the IDs of the items in the current batch.
var batchIds = batchItems.Select(item => item.Id);
// Define the list of items to get.
var edges = new List <Edge>();
// Use a new scope.
using (var scope = serviceProvider.CreateScope())
{
// Use a new context instance.
using var context = scope.ServiceProvider.GetRequiredService <ApplicationDbContext>();
// Get the items with the provided IDs.
var items = context.Edges
.Where(item => batchIds.Contains(item.Id));
// Check if there were no items found.
if (items == null || !items.Any())
{
// Continue.
continue;
}
// Get the items found.
edges = items
.ToList();
}
// Get the IDs of the items.
var edgeIds = edges
.Select(item => item.Id);
// Delete the dependent entities.
await EdgeExtensions.DeleteDependentAnalysesAsync(edgeIds, serviceProvider, token);
await EdgeExtensions.DeleteDependentNetworksAsync(edgeIds, serviceProvider, token);
// Delete the related entities.
await EdgeExtensions.DeleteRelatedEntitiesAsync <EdgeNode>(edgeIds, serviceProvider, token);
await EdgeExtensions.DeleteRelatedEntitiesAsync <DatabaseEdgeFieldEdge>(edgeIds, serviceProvider, token);
await EdgeExtensions.DeleteRelatedEntitiesAsync <DatabaseEdge>(edgeIds, serviceProvider, token);
// Delete the items.
await IEnumerableExtensions.DeleteAsync(edges, serviceProvider, token);
}
}