public static bool TryGetLowerBoundKey <K, V>(this BTreeDictionary <K, V> list, K key, out K closestKey)
{
var cmp = list.Comparer;
int lo = 0;
int hi = list.Count - 1;
closestKey = default(K);
bool set = false;
while (lo <= hi)
{
int mid = (hi - lo) / 2 + lo;
K k = list.Keys[mid];
int c = cmp.Compare(k, key);
if (c == 0)
{
closestKey = k;
return(true);
}
if (c < 0)
{
closestKey = k;
set = true;
lo = mid + 1;
}
else
{
hi = mid - 1;
}
}
return(set);
}
//$TODO: .NET 5 [NotNullWhen(returnValue: true)]
public static bool TryGetLowerBound <K, V>(this BTreeDictionary <K, V> list, K key, out V value)
{
var cmp = list.Comparer;
int lo = 0;
int hi = list.Count - 1;
value = default !;
public static bool TryGetUpperBoundIndex <K, V>(this BTreeDictionary <K, V> list, K key, out int closestIndex)
{
var cmp = list.Comparer;
int lo = 0;
int hi = list.Count - 1;
closestIndex = -1;
bool set = false;
while (lo <= hi)
{
int mid = (hi - lo) / 2 + lo;
K k = list.Keys[mid];
int c = cmp.Compare(k, key);
if (c == 0)
{
closestIndex = mid;
return(true);
}
if (c < 0)
{
lo = mid + 1;
}
else
{
closestIndex = mid;
set = true;
hi = mid - 1;
}
}
return(set);
}
public static bool TryGetUpperBound <K, V>(this BTreeDictionary <K, V> list, K key, out V value)
{
var cmp = list.Comparer;
int lo = 0;
int hi = list.Count - 1;
value = default(V);
bool set = false;
while (lo <= hi)
{
int mid = (hi - lo) / 2 + lo;
K k = list.Keys[mid];
int c = cmp.Compare(k, key);
if (c == 0)
{
value = list.Values[mid];
return(true);
}
if (c > 0)
{
value = list.Values[mid];
set = true;
hi = mid - 1;
}
else
{
lo = mid + 1;
}
}
return(set);
}
/// <summary>
/// Splits this node into subnodes by creating a new "right" node
/// and adds the (key,value) to the appropriate subnode.
/// </summary>
private Node SplitAndInsert(TKey key, TValue value, BTreeDictionary <TKey, TValue> tree)
{
var iSplit = (count + 1) / 2;
var right = new LeafNode(tree.LeafNodeChildren);
right.count = count - iSplit;
this.count = iSplit;
right.totalCount = right.count;
this.totalCount = this.count;
Array.Copy(this.keys, iSplit, right.keys, 0, right.count);
Array.Clear(this.keys, iSplit, right.count);
Array.Copy(this.values, iSplit, right.values, 0, right.count);
Array.Clear(this.values, iSplit, right.count);
right.nextLeaf = this.nextLeaf;
this.nextLeaf = right;
if (tree.Comparer.Compare(right.keys[0], key) < 0)
{
right.Put(key, value, false, tree);
}
else
{
this.Put(key, value, false, tree);
}
return(right);
}
public Node AddNode(TKey key, Node node, BTreeDictionary <TKey, TValue> tree)
{
int idx = Array.BinarySearch(keys, 1, count - 1, key, tree.Comparer);
if (idx >= 0)
{
throw new ArgumentException("Duplicate key.");
}
return(Insert(~idx, node.keys[0], node, tree).Item1);
}
public override (TValue, bool) Get(TKey key, BTreeDictionary <TKey, TValue> tree)
{
int idx = Array.BinarySearch(keys, 0, count, key, tree.Comparer);
if (idx < 0)
{
return(default(TValue), false);
}
return(values[idx], true);
}
public override bool Remove(TKey key, BTreeDictionary <TKey, TValue> tree)
{
int idx = Array.BinarySearch(keys, 0, count, key, tree.Comparer);
if (idx >= 0)
{
--count;
--totalCount;
Array.Copy(keys, idx + 1, keys, idx, count - idx);
Array.Copy(values, idx + 1, values, idx, count - idx);
keys[count] = default !;
public override (TValue, bool) Get(TKey key, BTreeDictionary <TKey, TValue> tree)
{
int idx = Array.BinarySearch(keys, 1, count - 1, key, tree.Comparer);
if (idx >= 0)
{
return(nodes[idx].Get(key, tree));
}
else
{
var iPos = (~idx) - 1;
return(nodes[iPos].Get(key, tree));
}
}
public override (Node, Node?) Put(TKey key, TValue value, bool setting, BTreeDictionary <TKey, TValue> tree)
{
int idx = Array.BinarySearch(keys, 0, count, key, tree.Comparer);
if (idx >= 0)
{
if (!setting)
{
throw new ArgumentException("Duplicate key.");
}
values[idx] = value;
return(this, null);
}
else
{
return(Insert(~idx, key, value, tree));
}
}
private (Node, Node) Insert(int idx, TKey key, Node node, BTreeDictionary <TKey, TValue> tree)
{
if (count == keys.Length)
{
var newRight = SplitAndInsert(key, node, tree);
return(this, newRight);
}
if (idx < count)
{
Array.Copy(keys, idx, keys, idx + 1, count - idx);
Array.Copy(nodes, idx, nodes, idx + 1, count - idx);
}
keys[idx] = key;
nodes[idx] = node;
++this.count;
this.totalCount = SumNodeCounts(this.nodes, this.count);
return(this, null);
}
public override (Node, Node) Put(TKey key, TValue value, bool setting, BTreeDictionary <TKey, TValue> tree)
{
int idx = Array.BinarySearch(keys, 1, count - 1, key, tree.Comparer);
int iPos = (idx >= 0)
? idx
: (~idx) - 1;
var subnode = nodes[iPos];
var(leftNode, rightNode) = subnode.Put(key, value, setting, tree);
if (rightNode == null)
{
this.totalCount = SumNodeCounts(this.nodes, this.count);
return(leftNode, null);
}
else
{
return(Insert(iPos + 1, rightNode.keys[0], rightNode, tree));
}
}
private (Node, Node) Insert(int idx, TKey key, TValue value, BTreeDictionary <TKey, TValue> tree)
{
if (count == keys.Length)
{
var newRight = SplitAndInsert(key, value, tree);
return(this, newRight);
}
else if (idx < count)
{
// Make a hole
Array.Copy(keys, idx, keys, idx + 1, count - idx);
Array.Copy(values, idx, values, idx + 1, count - idx);
}
keys[idx] = key;
values[idx] = value;
++this.count;
++this.totalCount;
return(this, null);
}
public override bool Remove(TKey key, BTreeDictionary <TKey, TValue> tree)
{
int idx = Array.BinarySearch(keys, 1, count - 1, key, tree.Comparer);
bool removed;
if (idx >= 0)
{
removed = nodes[idx].Remove(key, tree);
}
else
{
var iPos = (~idx) - 1;
removed = nodes[iPos].Remove(key, tree);
}
if (removed)
{
--this.totalCount;
}
return(removed);
}
private Node SplitAndInsert(TKey key, Node node, BTreeDictionary <TKey, TValue> tree)
{
var iSplit = (count + 1) / 2;
var right = new InternalNode(tree.InternalNodeChildren);
right.count = count - iSplit;
this.count = iSplit;
Array.Copy(this.keys, iSplit, right.keys, 0, right.count);
Array.Clear(this.keys, iSplit, right.count);
Array.Copy(this.nodes, iSplit, right.nodes, 0, right.count);
Array.Clear(this.nodes, iSplit, right.count);
if (tree.Comparer.Compare(right.keys[0], key) < 0)
{
right.AddNode(key, node, tree);
this.totalCount = SumNodeCounts(this.nodes, this.count);
}
else
{
this.AddNode(key, node, tree);
right.totalCount = SumNodeCounts(right.nodes, right.count);
}
return(right);
}
protected Collection(BTreeDictionary <TKey, TValue> btree)
{
this.btree = btree;
}
internal ValueCollection(BTreeDictionary <TKey, TValue> btree) :
base(btree)
{
}
public abstract (TValue, bool) Get(TKey key, BTreeDictionary <TKey, TValue> tree);
public abstract (Node, Node?) Put(TKey key, TValue value, bool setting, BTreeDictionary <TKey, TValue> tree);
public abstract bool Remove(TKey key, BTreeDictionary <TKey, TValue> tree);