/// <summary>
/// Creates a new updatable QuadTree instance
/// </summary>
/// <param name="insertStrategy">Strategy used to insert new entries into the index.</param>
/// <param name="nodeSplitStrategy">Strategy used to split nodes when they are full.</param>
/// <param name="heuristic">Heuristics used to build the index and keep it balanced.</param>
public DynamicQuadTree(IGeometryFactory geoFactory, IItemInsertStrategy <IExtents, TItem> insertStrategy, INodeSplitStrategy <IExtents, TItem> nodeSplitStrategy, DynamicQuadTreeBalanceHeuristic heuristic)
: base(geoFactory)
{
_insertStrategy = insertStrategy;
_nodeSplitStrategy = nodeSplitStrategy;
_heuristic = heuristic;
}
/// <summary>
/// Creates a new updatable R-Tree instance
/// </summary>
/// <param name="insertStrategy">Strategy used to insert new entries into the index.</param>
/// <param name="nodeSplitStrategy">Strategy used to split nodes when they are full.</param>
/// <param name="heuristic">Heuristics used to build the index and keep it balanced.</param>
public DynamicRTree(IEntryInsertStrategy insertStrategy, INodeSplitStrategy nodeSplitStrategy, DynamicRTreeHeuristic heuristic)
: base()
{
_insertStrategy = insertStrategy;
_nodeSplitStrategy = nodeSplitStrategy;
_heuristic = heuristic;
}
/// <summary>
/// Creates a new updatable R-Tree instance.
/// </summary>
/// <param name="geoFactory">
/// An <see cref="IGeometryFactory"/> for creating extent instances.
/// </param>
/// <param name="insertStrategy">
/// Strategy used to insert new entries into the index.
/// </param>
/// <param name="nodeSplitStrategy">
/// Strategy used to split nodes when they are full.
/// </param>
/// <param name="heuristic">
/// Heuristics used to build the index and keep it balanced.
/// </param>
public DynamicRTree(
IGeometryFactory geoFactory,
IItemInsertStrategy <IExtents, TItem> insertStrategy,
INodeSplitStrategy <IExtents, TItem> nodeSplitStrategy,
DynamicRTreeBalanceHeuristic heuristic)
: base(geoFactory)
{
if (insertStrategy == null)
{
throw new ArgumentNullException("insertStrategy");
}
if (nodeSplitStrategy == null)
{
throw new ArgumentNullException("nodeSplitStrategy");
}
if (heuristic == null)
{
throw new ArgumentNullException("heuristic");
}
_insertStrategy = insertStrategy;
_nodeSplitStrategy = nodeSplitStrategy;
_heuristic = heuristic;
}
/// <summary>
/// Creates a new SelfOptimizingDynamicSpatialIndex.
/// </summary>
/// <param name="geoFactory">An <see cref="IGeometryFactory"/> instance.</param>
/// <param name="restructureStrategy">The strategy used to restructure the index.</param>
/// <param name="restructureHeuristic">The heuristic to control when the index is restructured.</param>
/// <param name="insertStrategy">The strategy used to insert entries into the index.</param>
/// <param name="nodeSplitStrategy">The strategy used to split index nodes.</param>
/// <param name="indexHeuristic">A heuristic used to balance the index for optimum efficiency.</param>
/// <param name="idleMonitor">A monitor to determine idle conditions on the executing machine.</param>
public SelfOptimizingDynamicSpatialIndex(IGeometryFactory geoFactory,
IIndexRestructureStrategy <IExtents, TItem> restructureStrategy,
RestructuringHuristic restructureHeuristic,
IItemInsertStrategy <IExtents, TItem> insertStrategy,
INodeSplitStrategy <IExtents, TItem> nodeSplitStrategy,
DynamicRTreeBalanceHeuristic indexHeuristic,
IdleMonitor idleMonitor)
: base(geoFactory, insertStrategy, nodeSplitStrategy, indexHeuristic)
{
_periodMilliseconds = restructureHeuristic.WhenToRestructure == RestructureOpportunity.Periodic
? (Int32)(restructureHeuristic.Period / 1000.0)
: -1;
_restructureStrategy = restructureStrategy;
_restructuringHeuristic = restructureHeuristic;
_idleMonitor = idleMonitor;
_userIdleEvent = new AutoResetEvent(false);
_machineIdleEvent = new AutoResetEvent(false);
_terminateEvent = new ManualResetEvent(false);
if (restructureHeuristic.WhenToRestructure != RestructureOpportunity.None)
{
_restructureThread = new Thread(doRestructure);
_restructureThread.Start();
}
RestructureOpportunity idle = RestructureOpportunity.OnMachineIdle | RestructureOpportunity.OnUserIdle;
if (((Int32)(restructureHeuristic.WhenToRestructure & idle)) > 0)
{
if (_idleMonitor == null)
{
throw new ArgumentNullException("idleMonitor",
"If the restructuring heuristic has a value of anything but " +
"None for WhenToRestructure, the idleMonitor cannot be null.");
}
_idleMonitor.UserIdle += _idleMonitor_UserIdle;
_idleMonitor.UserBusy += _idleMonitor_UserBusy;
_idleMonitor.MachineIdle += _idleMonitor_MachineIdle;
_idleMonitor.MachineBusy += _idleMonitor_MachineBusy;
}
}
public void Insert(TBounds bounds, TItem entry, ISpatialIndexNode <TBounds, TItem> node, INodeSplitStrategy <TBounds, TItem> nodeSplitStrategy, IndexBalanceHeuristic heuristic, out ISpatialIndexNode <TBounds, TItem> newSiblingFromSplit)
{
newSiblingFromSplit = null;
//TODO: handle null node..
// Terminating case
if (node.IsLeaf)
{
node.Add(entry);
// Handle node overflow
if (node.ItemCount > heuristic.NodeItemMaximumCount)
{
// Split the node using the given strategy
newSiblingFromSplit = nodeSplitStrategy.SplitNode(node, heuristic);
//if (++_tempSplitCount % 100 == 0)
//{
// Debug.Print("Node split # {0}", _tempSplitCount);
//}
}
}
else
{
// NOTE: Descending the tree recursively here
// can make for a very expensive build of a tree,
// even for moderate amounts of data.
Double leastExpandedArea = Double.MaxValue;
Double leastExpandedChildArea = Double.MaxValue;
//TBounds currentBounds = new ComputationExtents(bounds);
ISpatialIndexNode <TBounds, TItem> leastExpandedChild;
leastExpandedChild = findLeastExpandedChild(node.SubNodes,
bounds,
leastExpandedArea,
leastExpandedChildArea);
Debug.Assert(leastExpandedChild != null);
// Found least expanded child node - insert into it
Insert(bounds, entry, leastExpandedChild, nodeSplitStrategy,
heuristic, out newSiblingFromSplit);
// Adjust this node...
node.Bounds.ExpandToInclude(bounds);
// Check for overflow and add to current node if it occured
if (newSiblingFromSplit != null)
{
// Add new sibling node to the current node
node.Add(newSiblingFromSplit);
newSiblingFromSplit = null;
// Split the current node, since the child count is too high,
// and return the split to the caller
if (node.ItemCount > heuristic.NodeItemMaximumCount)
{
newSiblingFromSplit = nodeSplitStrategy.SplitNode(node, heuristic);
}
}
}
}
private void insertEntryRecursive(QuadTreeNode <TItem> quadTreeNode, TItem entry, INodeSplitStrategy <IExtents, TItem> nodeSplitStrategy, IndexBalanceHeuristic heuristic, out ISpatialIndexNode <IExtents, TItem> newSiblingFromSplit)
{
throw new NotImplementedException();
}
public void Insert(IExtents bounds, TItem entry, ISpatialIndexNode <IExtents, TItem> node, INodeSplitStrategy <IExtents, TItem> nodeSplitStrategy, IndexBalanceHeuristic heuristic, out ISpatialIndexNode <IExtents, TItem> newSiblingFromSplit)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (!(node is QuadTreeNode <TItem>))
{
throw new ArgumentException("Parameter 'node' must be of type QuadTreeNode<TItem>", "node");
}
QuadTreeNode <TItem> quadTreeNode = node as QuadTreeNode <TItem>;
insertEntryRecursive(quadTreeNode, entry, nodeSplitStrategy, heuristic, out newSiblingFromSplit);
if (newSiblingFromSplit != null)
{
if (quadTreeNode.ItemCount == 4)
{
throw new QuadTreeIndexInsertOverflowException();
}
quadTreeNode.Add(newSiblingFromSplit);
}
}
