public async Task AddItemAsync(T new_key, int[] new_value, AddedItem <T> addedItem)
{
// Find the key after the spot where this item goes.
int spot = 0;
while (spot < NumKeysUsed)
{
if (this.Compare(Keys[spot], new_key) >= 0)
{
break;
}
spot++;
}
// See if we found it.
if ((spot < NumKeysUsed) && (this.Compare(Keys[spot], new_key) == 0))
{
Array.Resize <int>(ref Values[spot], Values[spot].Length + 1);
Values[spot][Values[spot].Length - 1] = new_value[0];
addedItem.up_key = default(T);
addedItem.up_value = null;
addedItem.up_node = null;
await this.PersistAsync().ConfigureAwait(false);
return;
}
await CheckChildrenAsync().ConfigureAwait(false);
// See if we are in a leaf node.
if (Children[0] == null)
{
// This is a leaf.
await AddItemToNodeAsync(spot, new_key, new_value, null, addedItem).ConfigureAwait(false);
}
else
{
// This is not a leaf. Move into the proper subtree.
await Children[spot].AddItemAsync(new_key, new_value, addedItem).ConfigureAwait(false);
// See if we had a bucket split.
if (addedItem.up_node != null)
{
// We had a bucket split. Add the new bucket here.
await AddItemToNodeAsync(spot, addedItem.up_key, addedItem.up_value, addedItem.up_node, addedItem).ConfigureAwait(false);
}
}
}
public async Task AddItemAsync(T new_key, int[] new_value)
{
if (this.Root.OID == 0)
{
await this.Root.PersistAsync().ConfigureAwait(false);
}
AddedItem <T> addedItem = new AddedItem <T>();
await Root.AddItemAsync(new_key, new_value, addedItem).ConfigureAwait(false);
// See if there was a root bucket split.
if (addedItem.up_node != null)
{
BTreeNode <T> new_root = new BTreeNode <T>(siaqodb, this);
new_root.Keys[0] = addedItem.up_key;
new_root.Values[0] = addedItem.up_value;
new_root.Children[0] = Root;
new_root.Children[1] = addedItem.up_node;
new_root.NumKeysUsed = 1;
Root = new_root;
await new_root.PersistAsync().ConfigureAwait(false);
}
}
private async Task SplitNodeAsync(int spot, T new_key, int[] new_value, BTreeNode <T> new_child, AddedItem <T> addedItem)
{
// Make arrays holding all of the keys, values, and children.
T[] new_keys = new T[KEYS_PER_NODE + 1];
Array.Copy(this.Keys, 0, new_keys, 0, spot);
new_keys[spot] = new_key;
Array.Copy(this.Keys, spot, new_keys, spot + 1, KEYS_PER_NODE - spot);
int[][] new_values = new int[KEYS_PER_NODE + 1][];
Array.Copy(this.Values, 0, new_values, 0, spot);
new_values[spot] = new_value;
Array.Copy(this.Values, spot, new_values, spot + 1, KEYS_PER_NODE - spot);
BTreeNode <T>[] new_children = new BTreeNode <T> [CHILDREN_PER_NODE + 1];
Array.Copy(this.Children, 0, new_children, 0, spot + 1);
new_children[spot + 1] = new_child;
Array.Copy(this.Children, spot + 1, new_children, spot + 2, KEYS_PER_NODE - spot);
// Copy the first half of the items into this node.
Array.Copy(new_keys, 0, this.Keys, 0, HALF_NUM_KEYS);
Array.Copy(new_values, 0, this.Values, 0, HALF_NUM_KEYS);
Array.Copy(new_children, 0, this.Children, 0, HALF_NUM_KEYS + 1);
Array.Clear(this.Keys, HALF_NUM_KEYS, HALF_NUM_KEYS);
Array.Clear(this.Values, HALF_NUM_KEYS, HALF_NUM_KEYS);
Array.Clear(this.Children, HALF_NUM_KEYS + 1, HALF_NUM_KEYS);
this.NumKeysUsed = HALF_NUM_KEYS;
// Set the up key and value.
addedItem.up_key = new_keys[HALF_NUM_KEYS];
addedItem.up_value = new_values[HALF_NUM_KEYS];
// Make the new node to pass up.
addedItem.up_node = new BTreeNode <T>(this.siaqodb, this.btree);
Array.Copy(new_keys, HALF_NUM_KEYS + 1, addedItem.up_node.Keys, 0, HALF_NUM_KEYS);
Array.Copy(new_values, HALF_NUM_KEYS + 1, addedItem.up_node.Values, 0, HALF_NUM_KEYS);
Array.Copy(new_children, HALF_NUM_KEYS + 1, addedItem.up_node.Children, 0, HALF_NUM_KEYS + 1);
addedItem.up_node.NumKeysUsed = HALF_NUM_KEYS;
await this.PersistAsync().ConfigureAwait(false);
await addedItem.up_node.PersistAsync().ConfigureAwait(false);
}
// Add the new item to this node, if it fits.
private async Task AddItemToNodeAsync(int spot, T new_key, int[] new_value, BTreeNode <T> new_child, AddedItem <T> addedItem)
{
// See if we have room.
if (NumKeysUsed < KEYS_PER_NODE)
{
// There is room here.
await AddItemInNodeWithRoomAsync(spot, new_key, new_value, new_child).ConfigureAwait(false);
addedItem.up_key = default(T);
addedItem.up_value = null;
addedItem.up_node = null;
}
else
{
// There is no room here.
await SplitNodeAsync(spot, new_key, new_value, new_child, addedItem).ConfigureAwait(false);
}
}
