public override IEnumerable<ObjectUUID> IndexOperation(AAttributeIndex myIndex, TupleDefinition myTuple, TypesOfBinaryExpression typeOfBinExpr, DBContext dbContext)
{
HashSet<ObjectUUID> interestingUUIDs = new HashSet<ObjectUUID>();
IndexKey idxLookupKey = null;
var currentType = dbContext.DBTypeManager.GetTypeByUUID(myIndex.IndexRelatedTypeUUID);
var myOperationValues = myTuple;
switch (typeOfBinExpr)
{
case TypesOfBinaryExpression.LeftComplex:
if (!myIndex.IsListOfBaseObjectsIndex)
{
foreach (var aItem in myOperationValues)
{
idxLookupKey = new IndexKey(myIndex.IndexKeyDefinition.IndexKeyAttributeUUIDs[0], (aItem.Value as ValueDefinition).Value, myIndex.IndexKeyDefinition);
interestingUUIDs.UnionWith(myIndex.GetValues(idxLookupKey, currentType, dbContext));
}
}
else
{
#region In case the index is from a set or list of baseobjects we use this way to get the values
foreach (var aItem in myOperationValues)
{
idxLookupKey = new IndexKey(myIndex.IndexKeyDefinition.IndexKeyAttributeUUIDs[0], (aItem.Value as ValueDefinition).Value, myIndex.IndexKeyDefinition);
interestingUUIDs.UnionWith(myIndex.GetValues(idxLookupKey, currentType, dbContext));
}
/* What the hack is that??? - This is too slow for any usual usage of in operator! */
var indexRelatedType = dbContext.DBTypeManager.GetTypeByUUID(myIndex.IndexRelatedTypeUUID);
foreach (var aKey in myIndex.GetKeys(currentType, dbContext).Where(item => !myOperationValues.Contains(new TupleElement(new ValueDefinition(item.IndexKeyValues[0])))))
{
foreach (var aMatch in myIndex.GetValues(aKey, indexRelatedType, dbContext).Intersect(interestingUUIDs))
{
interestingUUIDs.Remove(aMatch);
}
}
#endregion
}
break;
case TypesOfBinaryExpression.RightComplex:
var myEnumerator = myOperationValues.GetEnumerator();
if (myEnumerator.MoveNext())
{
idxLookupKey = new IndexKey(myIndex.IndexKeyDefinition.IndexKeyAttributeUUIDs[0], (myEnumerator.Current.Value as ValueDefinition).Value, myIndex.IndexKeyDefinition);
interestingUUIDs.UnionWith(myIndex.GetValues(idxLookupKey, currentType, dbContext));
while (myEnumerator.MoveNext())
{
idxLookupKey = new IndexKey(myIndex.IndexKeyDefinition.IndexKeyAttributeUUIDs[0], (myEnumerator.Current.Value as ValueDefinition).Value, myIndex.IndexKeyDefinition);
interestingUUIDs.IntersectWith(myIndex.GetValues(idxLookupKey, currentType, dbContext));
}
}
break;
case TypesOfBinaryExpression.Atom:
case TypesOfBinaryExpression.Complex:
case TypesOfBinaryExpression.Unknown:
default:
break;
}
foreach (var aValidUUID in interestingUUIDs)
{
yield return aValidUUID;
}
yield break;
}
public override Exceptional<IObject> Aggregate(AAttributeIndex attributeIndex, GraphDBType graphDBType, DBContext dbContext)
{
var indexRelatedType = dbContext.DBTypeManager.GetTypeByUUID(attributeIndex.IndexRelatedTypeUUID);
return new Exceptional<IObject>(attributeIndex.GetKeys(indexRelatedType, dbContext).Max().IndexKeyValues[0]);
}
public override Exceptional<FuncParameter> Aggregate(AAttributeIndex attributeIndex, GraphDBType graphDBType, DBContext dbContext)
{
var indexRelatedType = dbContext.DBTypeManager.GetTypeByUUID(attributeIndex.IndexRelatedTypeUUID);
return new Exceptional<FuncParameter>(new FuncParameter(attributeIndex.GetKeys(indexRelatedType, dbContext).Min().IndexKeyValues[0]));
}