public IEnumerable <IndexElement> EnumerateKeys()
{
List <int> subCounters = new List <int>()
{
0
};
Stack <IndexSector> sectorStack = new Stack <IndexSector>();
int currentLevel = 0;// current Gradient Level < MAXGRADIENTLEVEL
IndexSector currentSector = RootGradient;
while (true)
{
int idx = subCounters[currentLevel];
if (currentSector.IndexElements.Count == idx)
{
subCounters[currentLevel] = 0;
currentLevel--;
if (currentLevel < 0)
{
break;
}
currentSector = sectorStack.Pop();
subCounters[currentLevel]++;
continue;
}
IndexElement el = currentSector.IndexElements[idx];
if (currentSector.IsSerial)
{
yield return(el);
subCounters[currentLevel] = idx + 1;
}
else
{
sectorStack.Push(currentSector);
currentSector = GetSector(el.Reference);
currentLevel++;
if (subCounters.Count == currentLevel)
{
subCounters.Add(0);
}
}
}
}
public int Search(TaskQueue.ValueMap <string, object> key)
{
int outCmp = 0, idx;
IndexSector currentSector = RootGradient;
for (int i = 0; i < 1000; i++)
{
idx = currentSector.BinarySearch(key, out outCmp);
IndexElement el = currentSector.IndexElements[idx];
if (currentSector.IsSerial)
{
return(idx);
}
else
{
currentSector = GetSector(el.Reference);
}
}
return(-1);
}
public TaskQueue.ValueMap <string, object> GetMinKey()
{
IndexElement il = GetMinWithoutLeftBehindSectors();
return(il == null ? null : il.IndexKey);
}
public bool Remove(TaskQueue.ValueMap <string, object> key)
{
int outCmp = 0, idx;
IndexSector currentSector = RootGradient;
for (int i = 0; i < MAXGRADIENTLEVEL; i++)
{
idx = currentSector.BinarySearch(key, out outCmp);
if (currentSector.IsSerial)
{
if (outCmp == 0)
{
// ok we found it, remove it now
currentSector.IndexElements.RemoveAt(idx);
if (currentSector.IndexElements.Count == 0)
{
// nothing to do with it, sector remains with references on it in gradients
// or we can remove it if storage in-memory...
TaskQueue.ValueMap <string, object> newKey = null;
IndexSector refSector = currentSector;
IndexSector grad = GetSector(currentSector.TopGradientReference);
bool elementFound = true, nextElement = false, removeElement = true;
while (true)
{
elementFound = nextElement = false;
for (int j = 0; j < grad.IndexElements.Count; j++)
{
if (grad.IndexElements[j].Reference == refSector.Location)
{
elementFound = true;
if (removeElement)
{
if (grad.TopGradientReference != ROOTGRADIENT || grad.IndexElements.Count > 1)
{
grad.IndexElements.RemoveAt(j);
}
}
else
{
// update key if key in previous sector located at 0 index
grad.IndexElements[j].IndexKey = newKey;
}
if (grad.IndexElements.Count == 0 && grad.TopGradientReference != ROOTGRADIENT)
{
FreeSectors.Enqueue(grad.Location);
AllSectors[grad.Location] = null;
removeElement = true;
refSector = grad;
grad = GetSector(grad.TopGradientReference);
nextElement = true;
}
else
if (j == 0 && grad.TopGradientReference != ROOTGRADIENT)
{
removeElement = false;
newKey = grad.IndexElements[j].IndexKey;
refSector = grad;
grad = GetSector(grad.TopGradientReference);
nextElement = true;
}
break;//
}
}
if (!elementFound)
{
throw new Exception("reference key to sector not found");
}
else if (!nextElement)
{
break;
}
}
keysCount--;
return(true);
}
else
if (idx == 0)
{
// update ranges
TaskQueue.ValueMap <string, object> newKey = currentSector.IndexElements[0].IndexKey;
IndexSector refSector = currentSector;
IndexSector grad = GetSector(currentSector.TopGradientReference);
bool elementFound = true, nextElement = false;
while (true)
{
elementFound = nextElement = false;
for (int j = 0; j < grad.IndexElements.Count; j++)
{
if (grad.IndexElements[j].Reference == refSector.Location)
{
elementFound = true;
grad.IndexElements[j].IndexKey = newKey;
if (j == 0 && grad.TopGradientReference != ROOTGRADIENT)
{
refSector = grad;
grad = GetSector(grad.TopGradientReference);
nextElement = true;
}
break; //
}
}
if (!elementFound)
{
throw new Exception("reference key to sector not found");
}
else if (!nextElement)
{
break;
}
}
// removed successfully
keysCount--;
return(true);
}
}
else
{
// not found
return(false);
}
}
else
{
IndexElement el = null;
if (outCmp == 0)
{
el = currentSector.IndexElements[idx];
}
else
{
el = currentSector.IndexElements[idx > 0 ? idx - 1 : idx];
}
currentSector = GetSector(el.Reference);
// go deeper
}
}
// not found
return(false);
}
public void Add(TaskQueue.ValueMap <string, object> key)
{
int outCmp = 0, idx;
if (RootGradient.IndexElements.Count == 0)
{
initialSector.IndexElements.Add(new IndexElement(key));
RootGradient.IndexElements.Add(new IndexElement(key)
{
Reference = initialSector.Location
});
keysCount++;
return;
}
IndexSector currentSector = RootGradient;
for (int i = 0; i < MAXGRADIENTLEVEL; i++)
{
idx = currentSector.BinarySearch(key, out outCmp);
if (currentSector.IsSerial)
{
if (outCmp == 0 && currentSector.IndexElements.Count > 0)
{
// duplicates not allowed
throw new Exception("duplicates not allowed");
// actually allowed, but in this way remove operation will not perform correctly
}
Queue <QOperation> operationsQueue = new Queue <QOperation>();
operationsQueue.Enqueue(new QOperation()
{
Key = key,
OpType = QOperationType.ADDKEY,
Reference = currentSector,
index = idx
});
while (operationsQueue.Count > 0)
{
QOperation op = operationsQueue.Dequeue();
switch (op.OpType)
{
case QOperationType.ADDKEY:
if (op.index < 0)
{
op.index = op.Reference.BinarySearch(op.Key, out outCmp);
}
IndexElement new_element;
if (op.Reference.IsSerial)
{
new_element = new IndexElement(op.Key);
}
else
{
new_element = new IndexElement(op.Key)
{
Reference = op.location
}
};
if (op.Reference.IndexElements.Count == (op.Reference.IsSerial ? IndexMaxElementsCount : GradMaxElementsCount))
{
if (!op.Reference.IsSerial && op.Reference.TopGradientReference == ROOTGRADIENT)
{
// allocate new root gradient
IndexSector new_root_sector = new IndexSector(comparator, false);
new_root_sector.IndexElements = new List <IndexElement>();
new_root_sector.IndexElements.Add(new IndexElement(op.Reference.IndexElements[0].IndexKey)
{
Reference = op.Reference.Location
});
new_root_sector.TopGradientReference = ROOTGRADIENT;
SetSector(new_root_sector);
op.Reference.TopGradientReference = new_root_sector.Location;
RootGradient = new_root_sector;
}
IndexSector grad = GetSector(op.Reference.TopGradientReference);
// overflow
IndexSector new_sector = new IndexSector(comparator, op.Reference.IsSerial);
new_sector.IndexElements = new List <IndexElement>();
new_sector.TopGradientReference = op.Reference.TopGradientReference;
// split....
if (op.index != op.Reference.IndexElements.Count)
{
//for (int j = op.index; j < op.Reference.IndexElements.Count; j++)
//{
// if (comparator.Compare(op.Key, op.Reference.IndexElements[j].IndexKey) == 0) op.index++;
//}
op.Reference.IndexElements.Insert(op.index, new_element);
int cutindex = op.Reference.IndexElements.Count / 2;
new_sector.IndexElements = op.Reference.IndexElements.GetRange(cutindex, op.Reference.IndexElements.Count - cutindex);
op.Reference.IndexElements.RemoveRange(cutindex, op.Reference.IndexElements.Count - cutindex);
SetSector(new_sector);
if (op.index == 0)
{
operationsQueue.Enqueue(new QOperation()
{
OpType = QOperationType.UPDATEGRADIENTKEY,
Key = key,
Reference = grad,
location = op.Reference.Location
});
}
if (!op.Reference.IsSerial)
{
for (int j = 0; j < new_sector.IndexElements.Count; j++)
{
IndexSector reftoup = GetSector(new_sector.IndexElements[j].Reference);
reftoup.TopGradientReference = new_sector.Location;
}
}
}
else
{
// split not required
new_sector.IndexElements.Add(new_element);
SetSector(new_sector);
if (!new_sector.IsSerial)
{
IndexSector reftoup = GetSector(new_element.Reference);
reftoup.TopGradientReference = new_sector.Location;
}
}
operationsQueue.Enqueue(new QOperation()
{
OpType = QOperationType.ADDKEY,
Key = new_sector.IndexElements[0].IndexKey,
Reference = grad,
index = -1,
location = new_sector.Location
});
}
else
{
// just add element
//if (op.index == 0)
// for (int j = op.index; j < op.Reference.IndexElements.Count; j++)
// {
// if (comparator.Compare(op.Key, op.Reference.IndexElements[j].IndexKey) == 0) op.index++;
// }
op.Reference.IndexElements.Insert(op.index, new_element);
if ((op.index == 0 || op.Reference.IndexElements.Count == 1) && op.Reference.TopGradientReference != ROOTGRADIENT)
{
operationsQueue.Enqueue(new QOperation()
{
OpType = QOperationType.UPDATEGRADIENTKEY,
Key = new_element.IndexKey,
Reference = GetSector(op.Reference.TopGradientReference),
location = op.Reference.Location
});
}
}
break;
case QOperationType.UPDATEGRADIENTKEY:
for (int j = 0; j < op.Reference.IndexElements.Count; j++)
{
if (op.Reference.IndexElements[j].Reference == op.location)
{
op.Reference.IndexElements[j].IndexKey = op.Key;
if (j == 0 && op.Reference.TopGradientReference != ROOTGRADIENT)
{
operationsQueue.Enqueue(new QOperation()
{
OpType = QOperationType.UPDATEGRADIENTKEY,
Key = op.Key,
Reference = GetSector(op.Reference.TopGradientReference),
location = op.Reference.Location
});
}
break;
}
}
break;
default:
break;
}
}
//--------------
break;
}
else
{
IndexElement el = null;
if (outCmp == 0)
{
el = currentSector.IndexElements[idx];
}
else
{
el = currentSector.IndexElements[idx > 0 ? idx - 1 : idx];
}
currentSector = GetSector(el.Reference);
// go deeper
}
}
keysCount++;
}
