private void UpdateLowerLevels(IExpressionNode myNode, LevelKey myCurrentLevelKey, IEnumerable<LevelKey> myLowerLevelKeys, IExpressionGraph myGraph)
{
if (myCurrentLevelKey.Level > 0)
{
lock (myGraph)
{
//iterate the next lower LevelKeys
foreach (var aLowerLevelKey in myLowerLevelKeys)
{
#region data
//get next lower attribute (might be more than one step away)
int levelDistance = myCurrentLevelKey.Level - aLowerLevelKey.Level;
//GraphDBType currentType = null;
EdgeKey myCurrentBackwardEdgekey = null;
TypeAttribute currentAttribute = null;
SettingInvalidReferenceHandling invalidReferenceSetting = null;
#endregion
if (levelDistance >= 1)
{
if (myCurrentLevelKey.Level > 1)
{
myCurrentBackwardEdgekey = myCurrentLevelKey.Edges[myCurrentLevelKey.Level - 1];
}
else
{
myCurrentBackwardEdgekey = myCurrentLevelKey.Edges[0];
}
}
else
{
throw new GraphDBException(new Error_ExpressionGraphInternal(new System.Diagnostics.StackTrace(true), "Distances below 1 are not valid."));
}
IEnumerable<ObjectUUID> referencedUUIDs = null;
GraphDBType referencedType = null;
currentAttribute = _DBContext.DBTypeManager.GetTypeByUUID(myCurrentBackwardEdgekey.TypeUUID).GetTypeAttributeByUUID(myCurrentBackwardEdgekey.AttrUUID);
if (currentAttribute.IsBackwardEdge)
{
var backwardEdgeTypeInfo = currentAttribute.BackwardEdgeDefinition.GetTypeAndAttributeInformation(_DBContext.DBTypeManager);
var dbObjectStream = myNode.GetDBObjectStream(_DBObjectCache, backwardEdgeTypeInfo.Item1.UUID);
referencedType = backwardEdgeTypeInfo.Item2.GetDBType(_DBContext.DBTypeManager);
if (dbObjectStream.HasAttribute(backwardEdgeTypeInfo.Item2.UUID, backwardEdgeTypeInfo.Item1))
{
referencedUUIDs = GetUUIDsForAttribute(dbObjectStream, backwardEdgeTypeInfo.Item2, backwardEdgeTypeInfo.Item1);
}
}
else
{
referencedType = currentAttribute.GetRelatedType(_DBContext.DBTypeManager);
if (myNode.BackwardEdges.ContainsKey(aLowerLevelKey.LastEdge))
{
//take the edges that are already available
referencedUUIDs = myNode.BackwardEdges[aLowerLevelKey.LastEdge].Select(item => item.Destination);
}
else
{
//load the backward edge stream
var currentBackwardEdgeStream = _DBObjectCache.LoadDBBackwardEdgeStream(currentAttribute.GetDBType(_DBContext.DBTypeManager), myNode.GetObjectUUID());
if (currentBackwardEdgeStream.Failed())
{
throw new GraphDBException(new Error_CouldNotLoadBackwardEdge(myNode.GetDBObjectStream(_DBObjectCache, currentAttribute.GetRelatedType(_DBContext.DBTypeManager).UUID), currentAttribute, currentBackwardEdgeStream.IErrors));
}
if (currentBackwardEdgeStream.Value.ContainsBackwardEdge(myCurrentBackwardEdgekey))
{
referencedUUIDs = currentBackwardEdgeStream.Value.GetBackwardEdgeUUIDs(myCurrentBackwardEdgekey);
}
}
}
if (referencedUUIDs != null)
{
var lowerLevelKeys = ExtractLowerLevelKeys(GetPreviousLevel(aLowerLevelKey.Level, myGraph.Levels), aLowerLevelKey, myGraph);
EdgeKey edgeKeyForBackwardEdge = null;
//get edgeKey for backwardEdge
if (myCurrentLevelKey.Level == 1)
{
edgeKeyForBackwardEdge = aLowerLevelKey.LastEdge;
}
else
{
edgeKeyForBackwardEdge = aLowerLevelKey.Edges[aLowerLevelKey.Level - 1];
}
Exceptional<DBObjectStream> referencedDBObject = null;
foreach (var aReferenceObjectUUID in referencedUUIDs)
{
referencedDBObject = _DBObjectCache.LoadDBObjectStream(referencedType, aReferenceObjectUUID);
if (!referencedDBObject.Success())
{
#region error
if (invalidReferenceSetting == null)
{
invalidReferenceSetting = (SettingInvalidReferenceHandling)_DBContext.DBSettingsManager.GetSetting(SettingInvalidReferenceHandling.UUID, _DBContext, Enums.TypesSettingScope.ATTRIBUTE, referencedType, currentAttribute).Value;
}
switch (invalidReferenceSetting.Behaviour)
{
case BehaviourOnInvalidReference.ignore:
#region ignore
//set lower levelKeys to null because it is not possible to go any lower
AddNodeRecursiveBackward(aReferenceObjectUUID, myNode.GetObjectUUID(), myCurrentLevelKey, aLowerLevelKey, null, myGraph);
myNode.AddBackwardEdge(edgeKeyForBackwardEdge, aReferenceObjectUUID, null);
#endregion
break;
case BehaviourOnInvalidReference.log:
AddWarning(new Warning_EdgeToNonExistingNode(myNode.GetDBObjectStream(_DBObjectCache, referencedType.UUID), currentAttribute.GetDBType(_DBContext.DBTypeManager), currentAttribute, referencedDBObject.IErrors));
break;
default:
throw new GraphDBException(new Error_NotImplemented(new System.Diagnostics.StackTrace()));
}
#endregion
}
else
{
AddNodeRecursiveBackward(aReferenceObjectUUID, myNode.GetObjectUUID(), myCurrentLevelKey, aLowerLevelKey, lowerLevelKeys, myGraph);
myNode.AddBackwardEdge(edgeKeyForBackwardEdge, aReferenceObjectUUID, null);
}
}
}
}
}
}
}
