internal RelationshipDirection(string name, InnerEnum innerEnum, Org.Neo4j.Graphdb.Direction @internal)
{
this.Internal = @internal;
nameValue = name;
ordinalValue = nextOrdinal++;
innerEnumValue = innerEnum;
}
private static int CalculateTotalDegree(NodeCursor nodeCursor, Direction direction, int[] relTypes, CursorFactory cursors)
{
int degree = 0;
foreach (int relType in relTypes)
{
degree += NodeGetDegree(nodeCursor, cursors, direction, relType);
}
return(degree);
}
public override double?GetCost(Relationship relationship, Direction direction)
{
object costProp = relationship.GetProperty(_costPropertyName);
if (costProp is Number)
{
return((( Number )costProp).doubleValue());
}
else
{
return(double.Parse(costProp.ToString()));
}
}
public static RelationshipSelectionCursor ConnectingRelationships(Read read, CursorFactory cursors, NodeCursor nodeCursor, long fromNode, Direction direction, long toNode, int[] relTypes)
{
//Check from
int fromDegree = CalculateTotalDegreeIfDense(read, fromNode, nodeCursor, direction, relTypes, cursors);
if (fromDegree == 0)
{
return(Org.Neo4j.@internal.Kernel.Api.helpers.RelationshipSelectionCursor_EMPTY);
}
bool fromNodeIsDense = fromDegree != NOT_DENSE_DEGREE;
//Check to
read.SingleNode(toNode, nodeCursor);
if (!nodeCursor.Next())
{
return(Org.Neo4j.@internal.Kernel.Api.helpers.RelationshipSelectionCursor_EMPTY);
}
bool toNodeIsDense = nodeCursor.Dense;
//Both are dense, start with the one with the lesser degree
if (fromNodeIsDense && toNodeIsDense)
{
//Note that we have already position the cursor at toNode
int toDegree = CalculateTotalDegree(nodeCursor, direction, relTypes, cursors);
long startNode;
long endNode;
Direction relDirection;
if (fromDegree < toDegree)
{
startNode = fromNode;
endNode = toNode;
relDirection = direction;
}
else
{
startNode = toNode;
endNode = fromNode;
relDirection = direction.reverse();
}
return(ConnectingRelationshipsIterator(CompiledCursorUtils.NodeGetRelationships(read, cursors, nodeCursor, startNode, relDirection, relTypes), endNode));
}
else if (fromNodeIsDense)
{
return(ConnectingRelationshipsIterator(CompiledCursorUtils.NodeGetRelationships(read, cursors, nodeCursor, toNode, direction.reverse(), relTypes), fromNode));
}
else
{ //either only toNode is dense or none of them, just go with what we got
return(ConnectingRelationshipsIterator(CompiledCursorUtils.NodeGetRelationships(read, cursors, nodeCursor, fromNode, direction, relTypes), toNode));
}
}
protected internal override SingleSourceShortestPath <int> GetSingleSourceAlgorithm(Node startNode, Direction direction, params RelationshipType[] relTypes)
{
return(new SingleSourceShortestPathBFS(startNode, direction, relTypes));
}
public override double?GetCost(Relationship relationship, Direction direction)
{
return((( Number )relationship.GetProperty(_costPropertyName, _defaultCost)).doubleValue());
}
protected internal override SingleSourceShortestPath <int> GetSingleSourceAlgorithm(Node startNode, Direction direction, params RelationshipType[] relTypes)
{
return(new SingleSourceShortestPathDijkstra <int>(0, startNode, (relationship, direction1) => 1, new IntegerAdder(), int?.compareTo, direction, relTypes));
}
public static RelationshipSelectionCursor NodeGetRelationships(Read read, CursorFactory cursors, NodeCursor node, long nodeId, Direction direction)
{
return(NodeGetRelationships(read, cursors, node, nodeId, direction, null));
}
public static RelationshipSelectionCursor NodeGetRelationships(Read read, CursorFactory cursors, NodeCursor node, long nodeId, Direction direction, int[] types)
{
read.SingleNode(nodeId, node);
if (!node.Next())
{
return(Org.Neo4j.@internal.Kernel.Api.helpers.RelationshipSelectionCursor_EMPTY);
}
switch (direction.innerEnumValue)
{
case Direction.InnerEnum.OUTGOING:
return(RelationshipSelections.outgoingCursor(cursors, node, types));
case Direction.InnerEnum.INCOMING:
return(RelationshipSelections.incomingCursor(cursors, node, types));
case Direction.InnerEnum.BOTH:
return(RelationshipSelections.allCursor(cursors, node, types));
default:
throw new System.InvalidOperationException("Unknown direction " + direction);
}
}
private static int CalculateTotalDegreeIfDense(Read read, long node, NodeCursor nodeCursor, Direction direction, int[] relTypes, CursorFactory cursors)
{
read.SingleNode(node, nodeCursor);
if (!nodeCursor.Next())
{
return(0);
}
if (!nodeCursor.Dense)
{
return(NOT_DENSE_DEGREE);
}
return(CalculateTotalDegree(nodeCursor, direction, relTypes, cursors));
}
private static int NodeGetDegree(NodeCursor nodeCursor, CursorFactory cursors, Direction direction, int type)
{
switch (direction.innerEnumValue)
{
case Direction.InnerEnum.OUTGOING:
return(countOutgoing(nodeCursor, cursors, type));
case Direction.InnerEnum.INCOMING:
return(countIncoming(nodeCursor, cursors, type));
case Direction.InnerEnum.BOTH:
return(countAll(nodeCursor, cursors, type));
default:
throw new System.InvalidOperationException("Unknown direction " + direction);
}
}
internal static int NodeGetDegreeIfDense(Read read, long node, NodeCursor nodeCursor, CursorFactory cursors, Direction direction, int type)
{
read.SingleNode(node, nodeCursor);
if (!nodeCursor.Next())
{
return(0);
}
if (!nodeCursor.Dense)
{
return(NOT_DENSE_DEGREE);
}
return(NodeGetDegree(nodeCursor, cursors, direction, type));
}