/// <summary>
/// Make an iterator that will loop thru the collection in order.
/// </summary>
/// <param name="dictionary">
/// <see cref="SortedBPlusTreeDictionary<TKey,TValue>"/>
/// containing these key/value pairs.
/// </param>
public Enumerator(SortedBPlusTreeDictionary <TKey, TValue> dictionary)
{
currentLeaf = null;
leafIndex = 0;
_version = 0;
target = dictionary;
Reset();
}
/// <summary>
/// Get the node to the immediate left of the node at TreePath.
/// </summary>
internal SortedBPlusTreeDictionary <TKey, TValue> .Node GetLeftNode()
{
Debug.Assert(indexStack.Count == nodeStack.Count);
for (int depth = indexStack.Count - 2; depth >= 0; --depth)
{
if (indexStack[depth] > 0)
{
SortedBPlusTreeDictionary <TKey, TValue> .Node result = ((SortedBPlusTreeDictionary <TKey, TValue> .InternalNode)nodeStack[depth]).GetChild(indexStack[depth] - 1);
for (; depth < indexStack.Count - 2; ++depth)
{
result = ((SortedBPlusTreeDictionary <TKey, TValue> .InternalNode)result).GetChild(result.KeyCount);
}
return(result);
}
}
return(null);
}
/// <summary>Perform search and store each level of path on the stack.</summary>
/// <param name="tree">Tree to search.</param>
/// <param name="key">Value to find.</param>
internal TreePath(SortedBPlusTreeDictionary <TKey, TValue> tree, TKey key)
{
indexStack = new List <int>();
nodeStack = new List <SortedBPlusTreeDictionary <TKey, TValue> .Node>();
SortedBPlusTreeDictionary <TKey, TValue> .Node node = tree._root;
for (; ;)
{
Debug.Assert(node != null);
nodeStack.Add(node);
int i = node.Search(key, tree._comparer);
if (node is SortedBPlusTreeDictionary <TKey, TValue> .LeafNode)
{
IsFound = i >= 0;
if (!IsFound)
{
i = ~i;
}
indexStack.Add(i);
return;
}
if (i < 0)
{
i = ~i;
}
else
{
++i;
}
indexStack.Add(i);
node = ((SortedBPlusTreeDictionary <TKey, TValue> .InternalNode)node).GetChild(i);
}
}
/// <summary>Adjust tree path to node to the right.</summary>
/// <returns>Node to immediate right of current path; <b>null</b> if current path
/// at rightmost node.</returns>
internal SortedBPlusTreeDictionary <TKey, TValue> .Node TraverseRight()
{
SortedBPlusTreeDictionary <TKey, TValue> .Node node = null;
int height = indexStack.Count;
for (; ;)
{
if (indexStack.Count < 2)
{
Clear();
node = null;
break;
}
Pop();
node = TopNode;
int newIndex = TopNodeIndex + 1;
if (newIndex < ((SortedBPlusTreeDictionary <TKey, TValue> .InternalNode)node).ChildCount)
{
indexStack[indexStack.Count - 1] = newIndex;
node = ((SortedBPlusTreeDictionary <TKey, TValue> .InternalNode)node).GetChild(newIndex);
for (; ;)
{
Push(node, 0);
if (indexStack.Count >= height)
{
break;
}
node = ((SortedBPlusTreeDictionary <TKey, TValue> .InternalNode)node).FirstChild;
}
break;
}
}
return(node);
}
/// <summary>
/// Make a new <b>"BPlusTreeDictionary<TKey,TValue>.KeyCollection</b> that
/// holds the keys of a <see cref="SortedBPlusTreeDictionary<TKey,TValue>"/>.
/// </summary>
/// <param name="dictionary">
/// <see cref="SortedBPlusTreeDictionary<TKey,TValue>"/> containing these keys.
/// </param>
public BPlusTreeKeys(SortedBPlusTreeDictionary <TKey, TValue> dictionary)
{
this.tree = dictionary;
}
// Long form used for 5% performance increase.
public BPlusTreeValuesEnumerator(SortedBPlusTreeDictionary <TKey, TValue> tree)
{
target = tree;
Reset();
}
/// <summary>
/// Make a new <b>"BPlusTreeDictionary<TKey,TValue>.ValueCollection</b> that
/// holds the values of a <see cref="SortedBPlusTreeDictionary<TKey,TValue>"/>.
/// </summary>
/// <param name="dictionary">
/// <see cref="SortedBPlusTreeDictionary<TKey,TValue>"/> containing these keys.
/// </param>
public BPlusTreeValues(SortedBPlusTreeDictionary <TKey, TValue> dictionary)
{
this._target = dictionary;
}
/// <summary>
/// Make an enumerator that will loop thru the collection in order.
/// </summary>
/// <param name="dictionary">
/// <see cref="SortedBPlusTreeDictionary<TKey,TValue>"/>
/// containing these key/value pairs.
/// </param>
public BPlusTreeObjectEnumerator(SortedBPlusTreeDictionary <TKey, TValue> dictionary)
{
target = dictionary;
Reset();
}
internal void Push(SortedBPlusTreeDictionary <TKey, TValue> .Node newNode, int newNodeIndex)
{
nodeStack.Add(newNode);
indexStack.Add(newNodeIndex);
}