public NodeSet Match(NodeDescription nodeDescription)
{
if (nodeSets.Count == 0 && relationSets.Count == 0)
{
var nodeSet = FirstMatch(nodeDescription);
nodeSets.Add(nodeSet);
return(nodeSet);
}
if (nodeSets.Count != relationSets.Count)
{
throw new Exception("There cannot be 2 consecutive calls to Match(...) for one Query");
}
var lastRelationSet = relationSets.Last();
var newLastNodeSet = new NodeSet();
foreach (var relation in lastRelationSet.Relations)
{
var candidateNode = lastRelationSet.Direction == RelationsDirection.Right ? relation.To : relation.From;
if (nodeDescription.CheckNode(candidateNode))
{
newLastNodeSet.Nodes.Add(candidateNode);
}
}
nodeSets.Add(newLastNodeSet);
return(newLastNodeSet);
}
private NodeSet FirstMatch(NodeDescription nodeDescription)
{
var nodeBlocks = DbFetcher.SelectNodeBlocksByLabelAndProperties(nodeDescription.Label, nodeDescription.Props);
var nodeSet = new NodeSet();
foreach (var nodeBlock in nodeBlocks)
{
nodeSet.Nodes.Add(new Node(nodeBlock, db));
}
return(nodeSet);
}
private static void Main(string[] args)
{
using (var engine = new DbEngine())
{
// engine.DropDatabase();
Node user1 = engine.AddNode("user");
user1["age"] = 19;
Node user2 = engine.AddNode("user");
user2["age"] = 20;
var relation1 = engine.AddRelation(user1, user2, "knows");
relation1["some_property"] = "zzz";
engine.SaveChanges();
var query = new Query(engine);
var firstNodeDescription = new NodeDescription(
"user",
new Dictionary <string, object>
{
{ "age", 19 }
}
);
var relationDescription = new RelationDescription(
"knows",
new Dictionary <string, object>
{
{ "some_property", "zzz" }
}
);
var a = query.Match(firstNodeDescription);
var x = query.To(relationDescription);
var b = query.Match(NodeDescription.Any());
query.Execute();
Console.WriteLine(a.Nodes.First()["age"]);
Console.WriteLine(x.Relations.First()["some_property"]);
Console.WriteLine(b.Nodes.First()["age"]);
Console.ReadLine();
engine.DropDatabase();
}
}
