protected Exceptional<Boolean> RemoveBackwardEdgesOnReferences(AAttributeAssignOrUpdate myAAttributeAssign, IReferenceEdge myReference, DBObjectStream myDBObject, DBContext myDBContext)
{
foreach (var item in myReference.GetAllReferenceIDs())
{
var streamExcept = myDBContext.DBObjectCache.LoadDBObjectStream(myAAttributeAssign.AttributeIDChain.LastAttribute.GetDBType(myDBContext.DBTypeManager), (ObjectUUID)item);
if (!streamExcept.Success())
return new Exceptional<Boolean>(streamExcept.IErrors.First());
var removeExcept = myDBContext.DBObjectManager.RemoveBackwardEdge(streamExcept.Value, myAAttributeAssign.AttributeIDChain.LastAttribute.RelatedGraphDBTypeUUID, myAAttributeAssign.AttributeIDChain.LastAttribute.UUID, myDBObject.ObjectUUID);
if (!removeExcept.Success())
return new Exceptional<Boolean>(removeExcept.IErrors.First());
}
return new Exceptional<Boolean>(true);
}
/// <summary>
/// Sucht im Graphen nach Knoten "myEnd" ausgehend von der Knotenmenge "myEdge", bis zur max. Tiefe "myMaxDepth".
/// </summary>
/// <param name="myTypeAttribute">Kante über die gesucht werden soll</param>
/// <param name="myDBContext"></param>
/// <param name="myStart">Startknoten</param>
/// <param name="myEnd">gesuchter Knoten</param>
/// <param name="myEdge">Menge an Knoten, ausgehend vom Startknoten welche mittels einer Funktion eingeschränkt wurde</param>
/// <param name="myMaxDepth">max. Tiefe</param>
/// <returns>true wenn gesuchter Knoten min. 1 mal gefunden, false sonst</returns>
public bool Find(TypeAttribute myTypeAttribute, DBContext myDBContext, DBObjectStream myStart, DBObjectStream myEnd, IReferenceEdge myEdge, byte myMaxDepth)
{
#region data
//queue for BFS
Queue<ObjectUUID> queue = new Queue<ObjectUUID>();
//Dictionary to store visited TreeNodes
BigHashSet<ObjectUUID> visitedNodes = new BigHashSet<ObjectUUID>();
//current depth
byte depth = 2;
//first node in path tree, the start of the select
ObjectUUID root = myStart.ObjectUUID;
//constrainted set of nodes, of start node
HashSet<ObjectUUID> rootFriends = new HashSet<ObjectUUID>();
//target node, the target of the select
ObjectUUID target = myEnd.ObjectUUID;
//dummy node to check in which level the BFS is
ObjectUUID dummy = null;
//add root to visitedNodes
visitedNodes.Add(root);
//holds the actual DBObject
Exceptional<DBObjectStream> currentDBObject;
#endregion data
#region validate root
//check if root has edge
var dbo = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), root);
if (dbo.Failed())
{
throw new NotImplementedException();
}
if (!dbo.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
return false;
}
#endregion validate root
#region get friends of startElement and check if they are the target and valid
//instead of inserting only the startObject, we are using the startObject and the friends of the startObject (which could be restricted)
var firstUUIDs = myEdge.GetAllReferenceIDs();
for (int i = 0; i < firstUUIDs.Count(); i++)
{
var element = firstUUIDs.ElementAt(i);
if (element != null)
{
//create a new node and set root = parent
var currentNode = element;
#region check if the child is the target
//start and target are conntected directly
if (currentNode.Equals(myEnd.ObjectUUID))
{
//add node (which coud be the target) to startFriends (if start and target are directly connected, the target in the rootFriends list is needed)
rootFriends.Add(currentNode);
return true;
}
#endregion check if the child is the target
//check if element has edge
var dbobject = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), currentNode);
if (dbobject.Failed())
{
continue;
}
if (!dbobject.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
continue;
}
//enqueue node to start from left side
queue.Enqueue(currentNode);
//add node to visitedNodes
visitedNodes.Add(currentNode);
//add node to startFriends
rootFriends.Add(currentNode);
}
}
#endregion get friends of startElement and check if they are the target and valid
//enqueue dummy
queue.Enqueue(dummy);
#region BFS
//if there is more than one object in the queue and the actual depth is less than MaxDepth
while ((queue.Count > 1) && (depth <= myMaxDepth))
{
//get the first Object of the queue
ObjectUUID nodeOfQueue = queue.Dequeue();
#region check if nodeOfQueue is a dummy
//if nodeOfQueue is a dummy, this level is completely worked off
if (nodeOfQueue == null)
{
depth++;
queue.Enqueue(nodeOfQueue);
continue;
}
#endregion check if current is a dummy
//load DBObject
currentDBObject = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), nodeOfQueue);
if (currentDBObject.Failed())
{
throw new NotImplementedException();
}
if (currentDBObject.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
#region EdgeType is ASetOfReferencesEdgeType
if (myTypeAttribute.EdgeType is ASetOfReferencesEdgeType)
{
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDs = (currentDBObject.Value.GetAttribute(myTypeAttribute.UUID) as ASetOfReferencesEdgeType).GetAllReferenceIDs();
ObjectUUID currentNode;
foreach (ObjectUUID obj in objectUUIDs)
{
#region obj is target
//if the child is the target
if (target.Equals(obj))
{
return true;
}
#endregion obj is target
#region never seen before
else if (!visitedNodes.Contains(obj))
{
//create new node and set nodeOfQueue as parent
currentNode = new ObjectUUID(obj.ToString());
//mark the node as visited
visitedNodes.Add(currentNode);
//put created node in queue
queue.Enqueue(currentNode);
}
#endregion never seen before
}
}
#endregion EdgeType is ASetOfReferencesEdgeType
#region EdgeType is ASingleReferenceEdgeType
else if (myTypeAttribute.EdgeType is ASingleReferenceEdgeType)
{
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDs = (currentDBObject.Value.GetAttribute(myTypeAttribute.UUID) as ASingleReferenceEdgeType).GetAllReferenceIDs();
ObjectUUID objectUUID = objectUUIDs.First<ObjectUUID>();
ObjectUUID currentNode;
#region obj is target
//if the child is the target
if (target.Equals(objectUUID))
{
return true;
}
#endregion obj is target
#region never seen before
else if (!visitedNodes.Contains(objectUUID))
{
//create new node and set nodeOfQueue as parent
currentNode = new ObjectUUID(objectUUID.ToString());
//mark the node as visited
visitedNodes.Add(currentNode);
//put created node in queue
queue.Enqueue(currentNode);
}
#endregion never seen before
}
#endregion EdgeType is ASingleReferenceEdgeType
else
{
throw new NotImplementedException();
}
}
}
#endregion BFS
return false;
}
/// <summary>
/// Returns just UUID and Type for this edge
/// </summary>
/// <param name="referenceEdge"></param>
/// <param name="typeAttribute"></param>
/// <param name="myGraphDBType"></param>
/// <param name="myDBContext"></param>
/// <returns></returns>
private Edge GetNotResolvedReferenceEdgeAttributeValue(IReferenceEdge referenceEdge, GraphDBType myGraphDBType, DBContext myDBContext)
{
if (referenceEdge is ASetOfReferencesEdgeType)
{
return new Edge(null, (referenceEdge as ASetOfReferencesEdgeType).GetVertices((_ObjectUUID) => GenerateNotResolvedVertex(_ObjectUUID, myGraphDBType)), myGraphDBType.Name);
}
else if (referenceEdge is ASingleReferenceEdgeType)
{
return new Edge(null, (referenceEdge as ASingleReferenceEdgeType).GetVertex((_ObjectUUID) => GenerateNotResolvedVertex(_ObjectUUID, myGraphDBType)), myGraphDBType.Name);
}
else
{
throw new GraphDBException(new Error_NotImplemented(new StackTrace(true)));
}
}
//Logger
//private static Logger //_Logger = LogManager.GetCurrentClassLogger();
/// <summary>
/// Please look at the class documentation for detailed description how this algorithm works.
/// </summary>
/// <param name="myTypeAttribute">The Attribute representing the edge to follow (p.e. "Friends")</param>
/// <param name="myDBContext">The DBContext holds the TypeManager and the ObjectCache</param>
/// <param name="myStart">The start node</param>
/// <param name="myEnd">The end node</param>
/// <param name="shortestOnly">true, if only shortest path shall be found</param>
/// <param name="findAll">if true and shortestOnly is true, all shortest paths will be found. if true, and shortest only is false, all paths will be searched</param>
/// <param name="myMaxDepth">The maximum depth to search</param>
/// <param name="myMaxPathLength">The maximum path length which shall be analyzed</param>
/// <returns>A HashSet which contains all found paths. Every path is represented by a List of ObjectUUIDs</returns>m>
public HashSet<List<ObjectUUID>> Find(TypeAttribute myTypeAttribute, DBContext myDBContext, DBObjectStream myStart, IReferenceEdge myEdge, DBObjectStream myEnd, bool shortestOnly, bool findAll, byte myMaxDepth, byte myMaxPathLength)
{
#region declarations
//queue for BFS
var queueLeft = new Queue<Node>();
var queueRight = new Queue<Node>();
//Dictionary to store visited TreeNodes
var visitedNodesLeft = new BigDictionary<ObjectUUID, Node>();
var visitedNodesRight = new BigDictionary<ObjectUUID, Node>();
//set current depth left
byte depthLeft = 2;
//set current depth right
byte depthRight = 1;
//maximum depth
byte maxDepthLeft = 0;
byte maxDepthRight = 0;
#region initialize maxDepths
//if the maxDepth is greater then maxPathLength, then set maxDepth to maxPathLength
if (myMaxDepth > myMaxPathLength)
{
myMaxDepth = myMaxPathLength;
}
//set depth for left side
maxDepthLeft = Convert.ToByte(myMaxDepth / 2 + 1);
//if myMaxDepth is 1 maxDepthRight keeps 0, just one side is searching
if (myMaxDepth > 1)
{
//both sides have the same depth
maxDepthRight = maxDepthLeft;
}
//if myMaxDepth is even, one side has to search in a greater depth
if ((myMaxDepth % 2) == 0)
{
maxDepthRight = Convert.ToByte(maxDepthLeft - 1);
}
#endregion
//shortest path length
byte shortestPathLength = 0;
//target node, the target of the select
var target = new Node(myEnd.ObjectUUID);
var root = new Node(myStart.ObjectUUID);
HashSet<ObjectUUID> rootFriends = new HashSet<ObjectUUID>();
//dummy node to check in which level the BFS is
var dummyLeft = new Node();
var dummyRight = new Node();
#region get friends of startElement and check if they are the target and valid
//instead of inserting only the startObject, we are using the startObject and the friends of the startObject (which could be restricted)
var firstUUIDs = myEdge.GetAllReferenceIDs();
foreach (var element in firstUUIDs)
{
if (element != null)
{
//create a new node and set root = parent
var currentNodeLeft = new Node(element);
#region check if the child is the target
//start and target are conntected directly
if (currentNodeLeft.Key == myEnd.ObjectUUID)
{
//set depthRight to zero
depthRight = 0;
//add node (which coud be the target) to startFriends (if start and target are directly connected, the target in the rootFriends list is needed)
rootFriends.Add(currentNodeLeft.Key);
shortestPathLength = Convert.ToByte(depthLeft);
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
#endregion check if the child is the target
//check if element has edge
var dbo = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), currentNodeLeft.Key);
if (dbo.Failed())
{
continue;
}
if (!dbo.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
continue;
}
//enqueue node to start from left side
queueLeft.Enqueue(currentNodeLeft);
//add node to visitedNodes
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//add node to startFriends
rootFriends.Add(currentNodeLeft.Key);
}
}
#endregion get friends of startElement and check if they are the target and valid
//elements of myEdge doesn't have edge
if (visitedNodesLeft.Count == 0)
{
return null;
}
//check if target already found
if (shortestPathLength != 0)
{
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
//enqueue dummyLeft to analyze the depth of the left side
queueLeft.Enqueue(dummyLeft);
//holds the key of the backwardedge
var edgeKey = new EdgeKey(myTypeAttribute);
//holds the actual DBObject
Exceptional<DBObjectStream> currentDBObjectLeft;
Exceptional<BackwardEdgeStream> currentDBObjectRight;
#endregion declarations
#region BidirectionalBFS
//check if the EdgeType is ASetReferenceEdgeType
#region EdgeType is ASetReferenceEdgeType
if (myEdge is ASetOfReferencesEdgeType)
{
#region initialize variables
//enqueue target node to start from right side
queueRight.Enqueue(target);
//enqueue dummyRight to analyze the depth of the right side
queueRight.Enqueue(dummyRight);
//add root and target to visitedNodes
visitedNodesRight.Add(target.Key, target);
#endregion initialize variables
#region check if target has backwardedge
var be = myDBContext.DBObjectCache.LoadDBBackwardEdgeStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), target.Key);
if (be.Failed())
{
throw new NotImplementedException();
}
if (!be.Value.ContainsBackwardEdge(edgeKey))
{
return null;
}
#endregion check if target has backwardedge
//if there is more than one object in the queue and the actual depth is less than MaxDepth
while (((queueLeft.Count > 0) && (queueRight.Count > 0)) && ((depthLeft <= maxDepthLeft) || (depthRight <= maxDepthRight)))
{
#region both queues contain objects and both depths are not reached
if (((queueLeft.Count > 0) && (queueRight.Count > 0)) && ((depthLeft <= maxDepthLeft) && (depthRight <= maxDepthRight)))
{
//hold the actual element of the queues
Node currentLeft;
Node currentRight;
#region check if there is a dummyNode at the beginning of a queue
//first of both queues are dummies
if ((queueLeft.First<Node>() == dummyLeft) && (queueRight.First<Node>() == dummyRight))
{
//if maxDepth of a side is reached and there is a dummy, one level is totaly searched
if (depthLeft == maxDepthLeft && depthRight == maxDepthRight)
{
////_Logger.Info("going deeper in the dungeon on the left side.. current level: " + depthLeft);
depthLeft++;
////_Logger.Info("going deeper in the dungeon on the right side.. current level: " + depthRight);
depthRight++;
continue;
}
else if (depthLeft == maxDepthLeft)
{
////_Logger.Info("going deeper in the dungeon on the left side.. current level: " + depthLeft);
depthLeft++;
continue;
}
else if (depthRight == maxDepthRight)
{
////_Logger.Info("going deeper in the dungeon on the right side.. current level: " + depthRight);
depthRight++;
continue;
}
//dequeue dummies
queueLeft.Dequeue();
queueRight.Dequeue();
//increase depth's
////_Logger.Info("going deeper in the dungeon on the left side.. current level: " + depthLeft);
depthLeft++;
////_Logger.Info("going deeper in the dungeon on the right side.. current level: " + depthRight);
depthRight++;
//if both queues are empty -> break loop
if (queueLeft.Count == 0 && queueRight.Count == 0)
{
break;
}
//if left queue is empty enqueue right dummy and continue
else if (queueLeft.Count == 0)
{
queueRight.Enqueue(dummyRight);
continue;
}
//if right queue is empty enqueue left dummy and continue
else if (queueRight.Count == 0)
{
queueLeft.Enqueue(dummyLeft);
continue;
}
//enqueue both dummies
else
{
queueLeft.Enqueue(dummyLeft);
queueRight.Enqueue(dummyRight);
}
}
//first of left queue is a dummy
else if (queueLeft.First<Node>() == dummyLeft)
{
//if maxDepth of a side is reached and there is a dummy, one level is totaly searched
if (depthLeft == maxDepthLeft)
{
//_Logger.Info("going deeper in the dungeon on the left side.. current level: " + depthLeft);
depthLeft++;
continue;
}
//dequeue dummy
queueLeft.Dequeue();
//increase depth
//_Logger.Info("going deeper in the dungeon on the left side.. current level: " + depthLeft);
depthLeft++;
//if left queue is empty continue
if (queueLeft.Count == 0)
{
continue;
}
//enqueue dummy
else
{
queueLeft.Enqueue(dummyLeft);
}
}
//first of right queue is a dummy
else if (queueRight.First<Node>() == dummyRight)
{
//if maxDepth of a side is reached and there is a dummy, one level is totaly searched
if (depthRight == maxDepthRight)
{
//_Logger.Info("going deeper in the dungeon on the right side.. current level: " + depthRight);
depthRight++;
continue;
}
//dequeue dummy
queueRight.Dequeue();
//increase depth
//_Logger.Info("going deeper in the dungeon on the right side.. current level: " + depthRight);
depthRight++;
//if right queue is empty continue
if (queueRight.Count == 0)
{
continue;
}
//enqueue dummy
else
{
queueRight.Enqueue(dummyRight);
}
}
#endregion check if there is a dummyNode at the beginning of a queue
#region get first nodes of the queues
//get the first Object of the queue
currentLeft = queueLeft.Dequeue();
//get the first Object of the queue
currentRight = queueRight.Dequeue();
#endregion get first nodes of the queues
#region load DBObjects
//load DBObject
currentDBObjectLeft = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), currentLeft.Key);
if (currentDBObjectLeft.Failed())
{
throw new NotImplementedException();
}
//load DBObject
currentDBObjectRight = myDBContext.DBObjectCache.LoadDBBackwardEdgeStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), new ObjectUUID(currentRight.Key.ToString().TrimStart()));
if (currentDBObjectRight.Failed())
{
throw new NotImplementedException();
}
#endregion load DBObjects
#region the edge and the backwardedge are existing
if (currentDBObjectLeft.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager))
&& currentDBObjectRight.Value.ContainsBackwardEdge(edgeKey))
{
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDsLeft = (currentDBObjectLeft.Value.GetAttribute(myTypeAttribute.UUID) as ASetOfReferencesEdgeType).GetAllReferenceIDs();
Node currentNodeLeft;
#region check left friends
foreach (var dboLeft in objectUUIDsLeft)
{
#region if the child is the target
if (dboLeft == myEnd.ObjectUUID)
{
//set currentLeft as parent of target
target.addParent(currentLeft);
#region check if already visited
if (visitedNodesLeft.ContainsKey(dboLeft))
{
//set currentLeft as parent
visitedNodesLeft[dboLeft].addParent(currentLeft);
//set currentNodeLeft as child
currentLeft.addChild(visitedNodesLeft[dboLeft]);
}
else
{
//create a new node and set currentLeft = parent
currentNodeLeft = new Node(dboLeft, currentLeft);
//set currentNodeLeft as child of currentLeft
currentLeft.addChild(currentNodeLeft);
//never seen before
//mark the node as visited
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//and put node into the queue
queueLeft.Enqueue(currentNodeLeft);
}
#endregion check if already visited
#region check how much parents are searched
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
//if find all shortest paths
else if (shortestOnly && findAll)
{
//set maxDepth to actual depth
maxDepthLeft = depthLeft;
maxDepthRight = depthRight;
if ((depthLeft + depthRight) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight);
}
}
#endregion check how much parents are searched
}
#endregion if the child is the target
#region already visited
else if (visitedNodesLeft.ContainsKey(dboLeft))
{
//set currentLeft as parent
visitedNodesLeft[dboLeft].addParent(currentLeft);
//set currentNodeLeft as child
currentLeft.addChild(visitedNodesLeft[dboLeft]);
}
#endregion already visited
#region set as visited
else
{
//create a new node and set currentLeft = parent
currentNodeLeft = new Node(dboLeft, currentLeft);
//set currentNodeLeft as child of currentLeft
currentLeft.addChild(currentNodeLeft);
//never seen before
//mark the node as visited
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//and put node into the queue
queueLeft.Enqueue(currentNodeLeft);
}
#endregion set as visited
}
#endregion check left friends
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDsRight = currentDBObjectRight.Value.GetBackwardEdgeUUIDs(edgeKey);
Node currentNodeRight;
#region check right friends
foreach (ObjectUUID dboRight in objectUUIDsRight)
{
#region if the child is the target
if (rootFriends.Contains(dboRight))
{
#region check if already visited
//mark node as visited
if (visitedNodesRight.ContainsKey(dboRight))
{
//set found children
visitedNodesRight[dboRight].addChild(currentRight);
currentRight.addParent(visitedNodesRight[dboRight]);
}
else
{
//create a new node and set currentRight = child
currentNodeRight = new Node(dboRight);
currentNodeRight.addChild(currentRight);
//set currentNodeRight as parent of current Right
currentRight.addParent(currentNodeRight);
//never seen before
//mark the node as visited
visitedNodesRight.Add(currentNodeRight.Key, currentNodeRight);
//and look what comes on the next level of depth
queueRight.Enqueue(currentNodeRight);
}
#endregion check if already visited
#region check how much paths are searched
if (shortestOnly && !findAll)
{
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
//if find all shortest paths
else if (shortestOnly && findAll)
{
//set maxDepth to actual depth
maxDepthLeft = depthLeft;
maxDepthRight = depthRight;
if ((depthLeft + depthRight) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight);
}
}
#endregion check how much paths are searched
}
#endregion if the child is the target
#region already visited
else if (visitedNodesRight.ContainsKey(dboRight))
{
//set found children
visitedNodesRight[dboRight].addChild(currentRight);
currentRight.addParent(visitedNodesRight[dboRight]);
}
#endregion already visited
#region set as visited
else
{
//create a new node and set currentRight = child
currentNodeRight = new Node(dboRight);
currentNodeRight.addChild(currentRight);
//set currentNodeRight as parent of current Right
currentRight.addParent(currentNodeRight);
//never seen before
//mark the node as visited
visitedNodesRight.Add(currentNodeRight.Key, currentNodeRight);
//and look what comes on the next level of depth
queueRight.Enqueue(currentNodeRight);
}
#endregion set as visited
}
#endregion check right friends
#region build intersection of visitedNodesLeft and visitedNodesRight
//marks if intersection nodes are existing
bool foundIntersect = false;
foreach (var node in visitedNodesLeft)
{
if (visitedNodesRight[node.Key] != null)
{
//set nodes children and parents
node.Value.addChildren(visitedNodesRight[node.Key].Children);
node.Value.addParents(visitedNodesRight[node.Key].Parents);
//set nodes children and parents
visitedNodesRight[node.Key].addChildren(node.Value.Children);
visitedNodesRight[node.Key].addParents(node.Value.Parents);
foundIntersect = true;
}
}
#endregion build intersection of visitedNodesLeft and visitedNodesRight
#region analyze intersection
//if intersection nodes existing
if (foundIntersect)
{
//only shortest path
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
//if find all shortest paths
else if (shortestOnly && findAll)
{
//set maxDepth to actual depth
maxDepthLeft = depthLeft;
maxDepthRight = depthRight;
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else if (shortestPathLength == 0)
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
}
}
#endregion analyze intersection
}
#endregion the edge and the backwardedge are existing
#region only the edge exists
else if (currentDBObjectLeft.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDsLeft = (currentDBObjectLeft.Value.GetAttribute(myTypeAttribute.UUID) as ASetOfReferencesEdgeType).GetAllReferenceIDs();
Node currentNodeLeft;
#region check left friends
foreach (ObjectUUID dboLeft in objectUUIDsLeft)
{
#region if the child is the target
if (dboLeft == myEnd.ObjectUUID)
{
target.addParent(currentLeft);
#region check if already visited
if (visitedNodesLeft.ContainsKey(dboLeft))
{
//set currentLeft as parent
visitedNodesLeft[dboLeft].addParent(currentLeft);
//set currentNodeLeft as child
currentLeft.addChild(visitedNodesLeft[dboLeft]);
}
else
{
//create a new node and set currentLeft = parent
currentNodeLeft = new Node(dboLeft, currentLeft);
//set currentNodeLeft as child of currentLeft
currentLeft.addChild(currentNodeLeft);
//never seen before
//mark the node as visited
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//and put node into the queue
queueLeft.Enqueue(currentNodeLeft);
}
#endregion check if already visited
#region check how much paths are searched
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthLeft = depthLeft;
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
#endregion check if already visited
}
#endregion if the child is the target
#region already visited from right side
else if (visitedNodesRight.ContainsKey(dboLeft))
{
//get node
Node temp = visitedNodesRight[dboLeft];
//add parent new
temp.addParent(currentLeft);
//add as child
currentLeft.addChild(temp);
visitedNodesRight.Remove(temp.Key);
visitedNodesRight.Add(temp.Key, temp);
if (visitedNodesLeft.Remove(temp.Key))
{
visitedNodesLeft.Add(temp.Key, temp);
}
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthLeft = depthLeft;
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
}
#endregion already visited from right side
#region already visited
else if (visitedNodesLeft.ContainsKey(dboLeft))
{
//set found parents from left side as parents of matchNode
//matchNode has now parents and children
visitedNodesLeft[dboLeft].addParent(currentLeft);
currentLeft.addChild(visitedNodesLeft[dboLeft]);
}
#endregion already visited
#region set as visited
else
{
//create a new node and set currentLeft = parent
currentNodeLeft = new Node(dboLeft, currentLeft);
//set currentNodeLeft as child of currentLeft
currentLeft.addChild(currentNodeLeft);
//never seen before
//mark the node as visited
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//and look what comes on the next level of depth
queueLeft.Enqueue(currentNodeLeft);
}
#endregion set as visited
}
#endregion check left friends
}
#endregion only the edge exists
#region only the backwardedge exists
else if (currentDBObjectRight.Value.ContainsBackwardEdge(edgeKey))
{
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDsRight = currentDBObjectRight.Value.GetBackwardEdgeUUIDs(edgeKey);
Node currentNodeRight;
#region check right friends
foreach (ObjectUUID dboRight in objectUUIDsRight)
{
#region if the child is the target
if (rootFriends.Contains(dboRight))
{
#region check if already visited
//mark node as visited
if (visitedNodesRight.ContainsKey(dboRight))
{
//set found children
visitedNodesRight[dboRight].addChild(currentRight);
currentRight.addParent(visitedNodesRight[dboRight]);
}
else
{
//create a new node and set currentRight = child
currentNodeRight = new Node(dboRight);
currentNodeRight.addChild(currentRight);
//set currentNodeRight as parent of current Right
currentRight.addParent(currentNodeRight);
//never seen before
//mark the node as visited
visitedNodesRight.Add(currentNodeRight.Key, currentNodeRight);
//and look what comes on the next level of depth
queueRight.Enqueue(currentNodeRight);
}
#endregion check if already visited
#region check how much paths are searched
if (shortestOnly && !findAll)
{
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthRight = depthRight;
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
#endregion check how much paths are searched
}
#endregion if the child is the target
#region already visited from left side
else if (visitedNodesLeft.ContainsKey(dboRight))
{
//get node
Node temp = visitedNodesLeft[dboRight];
temp.addChild(currentRight);
currentRight.addParent(temp);
visitedNodesLeft.Remove(temp.Key);
visitedNodesLeft.Add(temp.Key, temp);
if (visitedNodesRight.Remove(temp.Key))
{
visitedNodesRight.Add(temp.Key, temp);
}
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthRight = depthRight;
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
}
#endregion already visited from left side
#region already visited
else if (visitedNodesRight.ContainsKey(dboRight))
{
//set found children
visitedNodesRight[dboRight].addChild(currentRight);
currentRight.addParent(visitedNodesRight[dboRight]);
}
#endregion already visited
#region set as visited
else
{
//create a new node and set currentRight = child
currentNodeRight = new Node(dboRight);
currentNodeRight.addChild(currentRight);
//set currentNodeRight as parent of currentRight
currentRight.addParent(currentNodeRight);
//never seen before
//mark the node as visited
visitedNodesRight.Add(currentNodeRight.Key, currentNodeRight);
//and look what comes on the next level of depth
queueRight.Enqueue(currentNodeRight);
}
#endregion set as visited
}
#endregion check right friends
}
#endregion only the backwardedge exists
}
#endregion both queues contain objects and both depths are not reached
#region only left queue contain objects
else if ((queueLeft.Count > 0) && (depthLeft <= maxDepthLeft))
{
#region check if first element of queue is a dummy
//dummy
if (queueLeft.First<Node>().Key == null)
{
queueLeft.Dequeue();
//_Logger.Info("going deeper in the dungeon on the left side.. current level: " + depthLeft);
depthLeft++;
if (queueLeft.Count == 0)
{
continue;
}
else if (depthLeft > maxDepthLeft)
{
continue;
}
}
#endregion check if first element of queue is a dummy
//get the first Object of the queue
Node currentLeft = queueLeft.Dequeue();
//load DBObject
currentDBObjectLeft = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), currentLeft.Key);
if (currentDBObjectLeft.Failed())
{
throw new NotImplementedException();
}
if (currentDBObjectLeft.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDsLeft = (currentDBObjectLeft.Value.GetAttribute(myTypeAttribute.UUID) as ASetOfReferencesEdgeType).GetAllReferenceIDs();
Node currentNodeLeft;
#region check left friends
foreach (ObjectUUID dboLeft in objectUUIDsLeft)
{
#region if the child is the target
if (dboLeft == myEnd.ObjectUUID)
{
target.addParent(currentLeft);
#region check if already visited
if (visitedNodesLeft.ContainsKey(dboLeft))
{
//set currentLeft as parent
visitedNodesLeft[dboLeft].addParent(currentLeft);
//set currentNodeLeft as child
currentLeft.addChild(visitedNodesLeft[dboLeft]);
}
else
{
//create a new node and set currentLeft = parent
currentNodeLeft = new Node(dboLeft, currentLeft);
//set currentNodeLeft as child of currentLeft
currentLeft.addChild(currentNodeLeft);
//never seen before
//mark the node as visited
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//and put node into the queue
queueLeft.Enqueue(currentNodeLeft);
}
#endregion check if already visited
#region check how much paths are searched
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthLeft = depthLeft;
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
#endregion check how much paths are searched
}
#endregion if the child is the target
#region already visited from right side
else if (visitedNodesRight.ContainsKey(dboLeft))
{
//get node
Node temp = visitedNodesRight[dboLeft];
//add parent new
temp.addParent(currentLeft);
//add as child
currentLeft.addChild(temp);
visitedNodesRight.Remove(temp.Key);
visitedNodesRight.Add(temp.Key, temp);
if (visitedNodesLeft.Remove(temp.Key))
{
visitedNodesLeft.Add(temp.Key, temp);
}
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthLeft = depthLeft;
if (shortestPathLength < (maxDepthLeft + maxDepthRight))
{
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
}
}
#endregion already visited from right side
#region already visited
else if (visitedNodesLeft.ContainsKey(dboLeft))
{
//set found parents from left side as parents of matchNode
//matchNode has now parents and children
visitedNodesLeft[dboLeft].addParent(currentLeft);
currentLeft.addChild(visitedNodesLeft[dboLeft]);
}
#endregion already visited
#region set as visited
else
{
//create a new node and set currentLeft = parent
currentNodeLeft = new Node(dboLeft, currentLeft);
currentLeft.addChild(currentNodeLeft);
//never seen before
//mark the node as visited
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//and look what comes on the next level of depth
queueLeft.Enqueue(currentNodeLeft);
}
#endregion set as visited
}
#endregion check left friends
}
}
#endregion only left queue contain objects
#region only right queue contain objects
else if ((queueRight.Count > 0) && (depthRight <= maxDepthRight))
{
//get the first Object of the queue
Node currentRight;
#region check if first element of the queue is a dummy
//dummy
if (queueRight.First<Node>().Key == null)
{
queueRight.Dequeue();
//_Logger.Info("going deeper in the dungeon on the right side.. current level: " + depthRight);
depthRight++;
if (queueRight.Count == 0)
{
continue;
}
}
#endregion check if first element of the queue is a dummy
currentRight = queueRight.Dequeue();
//load DBObject
currentDBObjectRight = myDBContext.DBObjectCache.LoadDBBackwardEdgeStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), currentRight.Key);
if (currentDBObjectRight.Failed())
{
throw new NotImplementedException();
}
if (currentDBObjectRight.Value.ContainsBackwardEdge(edgeKey))
{
//get all referenced ObjectUUIDs using the given Edge
var objectUUIDsRight = currentDBObjectRight.Value.GetBackwardEdgeUUIDs(edgeKey);
Node currentNodeRight;
#region check right friends
foreach (ObjectUUID dboRight in objectUUIDsRight)
{
#region if the child is the target
if (rootFriends.Contains(dboRight))
{
#region check if already visited
//mark node as visited
if (visitedNodesRight.ContainsKey(dboRight))
{
//set found children
visitedNodesRight[dboRight].addChild(currentRight);
currentRight.addParent(visitedNodesRight[dboRight]);
}
else
{
//create a new node and set currentRight = child
currentNodeRight = new Node(dboRight);
currentNodeRight.addChild(currentRight);
//set currentNodeRight as parent of current Right
currentRight.addParent(currentNodeRight);
//never seen before
//mark the node as visited
visitedNodesRight.Add(currentNodeRight.Key, currentNodeRight);
//and look what comes on the next level of depth
queueRight.Enqueue(currentNodeRight);
}
#endregion check if already visited
#region check how much paths are searched
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
shortestPathLength = Convert.ToByte(depthLeft + depthRight);
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthRight = depthRight;
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
#endregion check how much paths are searched
}
#endregion if the child is the target
#region already visited from left side
else if (visitedNodesLeft.ContainsKey(dboRight))
{
//get node
Node temp = visitedNodesLeft[dboRight];
temp.addChild(currentRight);
currentRight.addParent(temp);
visitedNodesLeft.Remove(temp.Key);
visitedNodesLeft.Add(temp.Key, temp);
if (visitedNodesRight.Remove(temp.Key))
{
visitedNodesRight.Add(temp.Key, temp);
}
if (shortestOnly && !findAll)
{
//_Logger.Info("found shortest path..starting analyzer");
if ((depthLeft + depthRight + 1) > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
else
{
shortestPathLength = Convert.ToByte(depthLeft + depthRight + 1);
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else if (shortestOnly && findAll)
{
maxDepthRight = depthRight;
shortestPathLength = Convert.ToByte(maxDepthLeft + maxDepthRight);
}
}
#endregion already visited from left side
#region already visited
else if (visitedNodesRight.ContainsKey(dboRight))
{
//set found children
visitedNodesRight[dboRight].addChild(currentRight);
currentRight.addParent(visitedNodesRight[dboRight]);
}
#endregion already visited
#region set as visited
else
{
//create a new node and set currentRight = child
currentNodeRight = new Node(dboRight);
currentNodeRight.addChild(currentRight);
currentRight.addParent(currentNodeRight);
//never seen before
//mark the node as visited
visitedNodesRight.Add(currentNodeRight.Key, currentNodeRight);
//and look what comes on the next level of depth
queueRight.Enqueue(currentNodeRight);
}
#endregion set as visited
}
#endregion check right friends
}
}
#endregion only right queue contain objects
#region abort loop
else
{
break;
}
#endregion abort loop
}
}
#endregion EdgeType is ASetReferenceEdgeType
//check if the EdgeType is ASingleReferenceEdgeType
#region EdgeType is ASingleReferenceEdgeType
else if (myEdge is ASingleReferenceEdgeType)
{
#region initialize variables
//if the maxDepth is greater then maxPathLength, then set maxDepth to maxPathLength
if (myMaxDepth > myMaxPathLength)
{
myMaxDepth = myMaxPathLength;
}
//set depth for left side
maxDepthLeft = myMaxDepth;
#endregion initialize variables
#region check if friends of root node have edge
foreach (var node in visitedNodesLeft)
{
var dbo = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), node.Key);
if (dbo.Failed())
{
if (visitedNodesLeft.Count != 0)
{
visitedNodesLeft.Remove(node.Key);
}
else
{
throw new NotImplementedException();
}
}
if (!dbo.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
if (visitedNodesLeft.Count != 0)
{
visitedNodesLeft.Remove(node.Key);
}
else
{
return null;
}
}
}
#endregion check if friends of root node have edge
//if there is more than one object in the queue and the actual depth is less than MaxDepth
while ((queueLeft.Count > 0) && (depthLeft <= maxDepthLeft))
{
#region check if first element of queue is a dummy
//dummy
if (queueLeft.First<Node>().Key == null)
{
queueLeft.Dequeue();
//_Logger.Info("going deeper in the dungeon on the left side.. current level: " + depthLeft);
depthLeft++;
if ((queueLeft.Count == 0) || (depthLeft > maxDepthLeft))
{
break;
}
else
{
queueLeft.Enqueue(dummyLeft);
continue;
}
}
#endregion check if first element of queue is a dummy
#region load DBObject
//get the first Object of the queue
var currentLeft = queueLeft.Dequeue();
//load DBObject
currentDBObjectLeft = myDBContext.DBObjectCache.LoadDBObjectStream(myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager), currentLeft.Key);
if (currentDBObjectLeft.Failed())
{
throw new NotImplementedException();
}
#endregion load DBObject
#region check if currentDBObjectLeft has attribute
if (currentDBObjectLeft.Value.HasAttribute(myTypeAttribute.UUID, myTypeAttribute.GetRelatedType(myDBContext.DBTypeManager)))
{
//get referenced ObjectUUID using the given Edge
var objectUUIDsLeft = (currentDBObjectLeft.Value.GetAttribute(myTypeAttribute.UUID) as ASingleReferenceEdgeType).GetAllReferenceIDs();
Node currentNodeLeft;
#region check left friend
var dboLeft = objectUUIDsLeft.First();
//create a new node and set currentLeft = parent
currentNodeLeft = new Node(dboLeft, currentLeft);
#region if the child is the target
if (currentNodeLeft.Key == myEnd.ObjectUUID)
{
//set currentLeft as parent of target
target.addParent(currentLeft);
//shortestPathLength is actual depth of left side plus 1 (because the depth starts with zero, but the pathLength with 1)
shortestPathLength = Convert.ToByte(depthLeft + 1);
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
#endregion if the child is the target
#region already visited
else if (visitedNodesLeft.ContainsKey(currentNodeLeft.Key))
{
//set currentLeft as parent
visitedNodesLeft[currentNodeLeft.Key].addParent(currentLeft);
//set currentNodeLeft as child
currentLeft.addChild(visitedNodesLeft[currentNodeLeft.Key]);
}
#endregion already visited
#region set as visited
else
{
//set currentNodeLeft as child of currentLeft
currentLeft.addChild(currentNodeLeft);
//never seen before
//mark the node as visited
visitedNodesLeft.Add(currentNodeLeft.Key, currentNodeLeft);
//and put node into the queue
queueLeft.Enqueue(currentNodeLeft);
}
#endregion set as visited
#endregion check left friend
}
#endregion check if currentDBObjectLeft has attribute
#region abort loop
else
{
break;
}
#endregion abort loop
}
}
#endregion EdgeType is ASingleReferenceEdgeType
else
{
throw new NotImplementedException();
}
#region start TargetAnalyzer
if (shortestOnly && findAll)
{
if (shortestPathLength > myMaxPathLength)
{
shortestPathLength = myMaxPathLength;
}
return new TargetAnalyzer(root, rootFriends, target, shortestPathLength, shortestOnly, findAll).getPaths();
}
else
{
return new TargetAnalyzer(root, rootFriends, target, myMaxPathLength, shortestOnly, findAll).getPaths();
}
#endregion start TargetAnalyzer
#endregion BidirectionalBFS
}