public virtual void query(BKTreeNode node, Int32 threshold, Dictionary<BKTreeNode, Int32> collected)
{
Int32 distanceAtNode = calculateDistance(node);
if (distanceAtNode == threshold)
{
collected.Add(this, distanceAtNode);
return;
}
if (distanceAtNode < threshold)
{
collected.Add(this, distanceAtNode);
}
for (Int32 distance = (distanceAtNode - threshold); distance <= (threshold + distanceAtNode); distance++)
{
if (_children != null)
{
if (_children.ContainsKey(distance))
{
_children[distance].query(node, threshold, collected);
}
}
}
}
/**
* Attempts to find the closest match to the search node.
* @param node
* @return A match that is within the best edit distance of the search node.
*/
public T findBestNode(BKTreeNode node)
{
BKTreeNode bestNode;
_root.findBestMatch(node, Int32.MaxValue, out bestNode);
return((T)bestNode);
}
public virtual Int32 findBestMatch(BKTreeNode node, Int32 bestDistance, out BKTreeNode bestNode)
{
Int32 distanceAtNode = calculateDistance(node);
bestNode = node;
if(distanceAtNode < bestDistance)
{
bestDistance = distanceAtNode;
bestNode = this;
}
Int32 possibleBest = bestDistance;
foreach (Int32 distance in _children.Keys)
{
if (distance < distanceAtNode + bestDistance)
{
possibleBest = _children[distance].findBestMatch(node, bestDistance, out bestNode);
if (possibleBest < bestDistance)
{
bestDistance = possibleBest;
}
}
}
return bestDistance;
}
public virtual void query(BKTreeNode node, Int32 threshold, Dictionary <BKTreeNode, Int32> collected)
{
Int32 distanceAtNode = calculateDistance(node);
if (distanceAtNode == threshold)
{
collected.Add(this, distanceAtNode);
return;
}
if (distanceAtNode < threshold)
{
collected.Add(this, distanceAtNode);
}
for (Int32 distance = (distanceAtNode - threshold); distance <= (threshold + distanceAtNode); distance++)
{
if (_children != null)
{
if (_children.ContainsKey(distance))
{
_children[distance].query(node, threshold, collected);
}
}
}
}
public virtual Int32 findBestMatch(BKTreeNode node, Int32 bestDistance, out BKTreeNode bestNode)
{
Int32 distanceAtNode = calculateDistance(node);
bestNode = node;
if (distanceAtNode < bestDistance)
{
bestDistance = distanceAtNode;
bestNode = this;
}
Int32 possibleBest = bestDistance;
foreach (Int32 distance in _children.Keys)
{
if (distance < distanceAtNode + bestDistance)
{
possibleBest = _children[distance].findBestMatch(node, bestDistance, out bestNode);
if (possibleBest < bestDistance)
{
bestDistance = possibleBest;
}
}
}
return(bestDistance);
}
/**
* This method will find all the close matching Nodes within
* a certain threshold. For instance, to search for similar
* strings, threshold set to 1 will return all the strings that
* are off by 1 edit distance.
* @param searchNode
* @param threshold
* @return
*/
public Dictionary <T, Int32> query(BKTreeNode searchNode, Int32 threshold)
{
Dictionary <BKTreeNode, Int32> matches = new Dictionary <BKTreeNode, Int32>();
_root.query(searchNode, threshold, matches);
return(copyMatches(matches));
}
protected override Int32 calculateDistance(BKTreeNode node)
{
MemorySize.Hits++;
double[] ceddDiscriptor1 = this.CEDDDiscriptor;
double[] ceddDiscriptor2 = ((CEDDTreeNode)node).CEDDDiscriptor;
double dist = CEDD_Descriptor.CEDD.Compare(ceddDiscriptor1, ceddDiscriptor2);
return Convert.ToInt32(dist);
}
/**
* Attempts to find the closest match to the search node.
* @param node
* @return A match that is within the best edit distance of the search node.
*/
public Dictionary <T, Int32> findBestNodeWithDistance(BKTreeNode node)
{
BKTreeNode bestNode;
Int32 distance = _root.findBestMatch(node, Int32.MaxValue, out bestNode);
_matches.Clear();
_matches.Add((T)bestNode, distance);
return(_matches);
}
protected override Int32 calculateDistance(BKTreeNode node)
{
MemorySize.Hits++;
double[] ceddDiscriptor1 = this.CEDDDiscriptor;
double[] ceddDiscriptor2 = ((CEDDTreeNode)node).CEDDDiscriptor;
double dist = CEDD_Descriptor.CEDD.Compare(ceddDiscriptor1, ceddDiscriptor2);
return(Convert.ToInt32(dist));
}
public virtual void add(BKTreeNode node)
{
if (_children == null)
_children = new SortedDictionary<Int32, BKTreeNode>();
Int32 distance = calculateDistance(node);
if (_children.ContainsKey(distance))
{
_children[distance].add(node);
}
else
{
_children.Add(distance, node);
}
}
public virtual void add(BKTreeNode node)
{
if (_children == null)
{
_children = new SortedDictionary <Int32, BKTreeNode>();
}
Int32 distance = calculateDistance(node);
if (_children.ContainsKey(distance))
{
_children[distance].add(node);
}
else
{
_children.Add(distance, node);
}
}
protected abstract int calculateDistance(BKTreeNode node);
/**
* Attempts to find the closest match to the search node.
* @param node
* @return The edit distance of the best match
*/
public Int32 findBestDistance(BKTreeNode node)
{
BKTreeNode bestNode;
return(_root.findBestMatch(node, Int32.MaxValue, out bestNode));
}
protected abstract int calculateDistance(BKTreeNode node);