public override object Read(IPackStreamReader reader, byte signature, long size)
{
// List of unique nodes
var uniqNodes = new INode[(int)reader.ReadListHeader()];
for (var i = 0; i < uniqNodes.Length; i++)
{
var node = reader.Read() as INode;
Throw.ProtocolException.IfFalse(node != null, "receivedNode");
uniqNodes[i] = node;
}
// List of unique relationships, without start/end information
var uniqRels = new Relationship[(int)reader.ReadListHeader()];
for (var i = 0; i < uniqRels.Length; i++)
{
var uniqRel = reader.Read() as Relationship;
Throw.ProtocolException.IfFalse(uniqRel != null, "receivedUnboundRelationship");
uniqRels[i] = uniqRel;
}
// Path sequence
var length = (int)reader.ReadListHeader();
// Knowing the sequence length, we can create the arrays that will represent the nodes, rels and segments in their "path order"
var segments = new ISegment[length / 2];
var nodes = new INode[segments.Length + 1];
var rels = new IRelationship[segments.Length];
var prevNode = uniqNodes[0];
nodes[0] = prevNode;
for (var i = 0; i < segments.Length; i++)
{
var relIdx = (int)reader.ReadLong();
var nextNode =
uniqNodes[(int)reader.ReadLong()]; // Start node is always 0, and isn't encoded in the sequence
// Negative rel index means this rel was traversed "inversed" from its direction
Relationship rel;
if (relIdx < 0)
{
rel = uniqRels[(-relIdx) - 1]; // -1 because rel idx are 1-indexed
rel.SetStartAndEnd(nextNode.Id, prevNode.Id);
}
else
{
rel = uniqRels[relIdx - 1];
rel.SetStartAndEnd(prevNode.Id, nextNode.Id);
}
nodes[i + 1] = nextNode;
rels[i] = rel;
segments[i] = new Segment(prevNode, rel, nextNode);
prevNode = nextNode;
}
return(new Path(segments.ToList(), nodes.ToList(), rels.ToList()));
}
private IPath UnpackPath()
{
// List of unique nodes
var uniqNodes = new INode[(int)_unpacker.UnpackListHeader()];
for (int i = 0; i < uniqNodes.Length; i++)
{
Throw.ArgumentException.IfNotEqual(NodeFields, _unpacker.UnpackStructHeader(), nameof(NodeFields), $"received{nameof(NodeFields)}");
Throw.ArgumentException.IfNotEqual(NODE, _unpacker.UnpackStructSignature(), nameof(NODE), $"received{nameof(NODE)}");
uniqNodes[i] = UnpackNode();
}
// List of unique relationships, without start/end information
var uniqRels = new Relationship[(int)_unpacker.UnpackListHeader()];
for (int i = 0; i < uniqRels.Length; i++)
{
Throw.ArgumentException.IfNotEqual(UnboundRelationshipFields, _unpacker.UnpackStructHeader(), nameof(UnboundRelationshipFields), $"received{nameof(UnboundRelationshipFields)}");
Throw.ArgumentException.IfNotEqual(UNBOUND_RELATIONSHIP, _unpacker.UnpackStructSignature(), nameof(UNBOUND_RELATIONSHIP), $"received{nameof(UNBOUND_RELATIONSHIP)}");
var urn = _unpacker.UnpackLong();
var relType = _unpacker.UnpackString();
var props = UnpackMap();
uniqRels[i] = new Relationship(urn, -1, -1, relType, props);
}
// Path sequence
var length = (int)_unpacker.UnpackListHeader();
// Knowing the sequence length, we can create the arrays that will represent the nodes, rels and segments in their "path order"
var segments = new ISegment[length / 2];
var nodes = new INode[segments.Length + 1];
var rels = new IRelationship[segments.Length];
var prevNode = uniqNodes[0];
INode nextNode; // Start node is always 0, and isn't encoded in the sequence
Relationship rel;
nodes[0] = prevNode;
for (int i = 0; i < segments.Length; i++)
{
int relIdx = (int)_unpacker.UnpackLong();
nextNode = uniqNodes[(int)_unpacker.UnpackLong()];
// Negative rel index means this rel was traversed "inversed" from its direction
if (relIdx < 0)
{
rel = uniqRels[(-relIdx) - 1]; // -1 because rel idx are 1-indexed
rel.SetStartAndEnd(nextNode.Id, prevNode.Id);
}
else
{
rel = uniqRels[relIdx - 1];
rel.SetStartAndEnd(prevNode.Id, nextNode.Id);
}
nodes[i + 1] = nextNode;
rels[i] = rel;
segments[i] = new Segment(prevNode, rel, nextNode);
prevNode = nextNode;
}
return(new Path(segments.ToList(), nodes.ToList(), rels.ToList()));
}
