public bool Remove(int key, Element elem)
{
if (elem == null)
{
throw new Exception("Invalid element to remove");
}
RegionLock.EnterWriteLock();
try
{
// get region to remove from
GetRegion(elem.X, elem.Y, out int row, out int column);
// check if this is an item that would span multiple regions
if (IsOversized(elem) || IsOutofRange(row, column))
{
return(Oversized.Remove(key));
}
// add to the region specified (or span multiple regions)
return(Regions[row][column].Remove(key));
}
finally
{
RegionLock.ExitWriteLock();
}
}
public void Add(int key, Element elem)
{
if (elem == null)
{
throw new Exception("Invalid element to add");
}
RegionLock.EnterWriteLock();
try
{
// get region to insert into
GetRegion(elem.X, elem.Y, out int row, out int column);
// check if this is an item that would span multiple regions
if (IsOversized(elem) || IsOutofRange(row, column))
{
Oversized.Add(key, elem);
return;
}
// add to the region specified (or span multiple regions)
Regions[row][column].Add(key, elem);
}
finally
{
RegionLock.ExitWriteLock();
}
}
public void Move(int key, Region src, Region dst)
{
RegionLock.EnterWriteLock();
try
{
// get element (either in oversized or a Region)
Element elem;
if (Oversized.TryGetValue(key, out elem))
{
// if elment is Oversized or the dst is out of range, keep it here
if (IsOversized(elem))
{
return;
}
// assert that this element is currently out of range
if (!IsOutofRange(src))
{
throw new Exception("Invalid state in internal datastructures");
}
// if it remains out of range, keep it here
if (IsOutofRange(dst))
{
return;
}
// remove it from the oversized, as it is moving to a region
if (!Oversized.Remove(key))
{
throw new Exception("Failed to remove this element");
}
}
else
{
// find it and remove it
if (!Regions[src.Row][src.Col].TryGetValue(key, out elem))
{
throw new Exception("Failed to location the element to move");
}
if (!Regions[src.Row][src.Col].Remove(key))
{
throw new Exception("Failed to remove this element");
}
}
// add element (either oversized or a Region)
if (IsOutofRange(dst))
{
Oversized.Add(key, elem);
}
else
{
Regions[dst.Row][dst.Col].Add(key, elem);
}
}
finally
{
RegionLock.ExitWriteLock();
}
}
