private void InitNewRoot(T key)
{
root = new ABTreeNode <T>(this.maxChildren);
root.keys.Add(key);
root.accumulations.Add(new List <T>());
this.Count++;
this.CountWithAccum++;
}
/// <summary>
/// Move accumulations to the empty right node when splitting.
/// </summary>
public void MoveAccumulations(ABTreeNode <TT> right, int startIndex)
{
for (int i = startIndex; i < this.accumulations.Count; i++)
{
right.accumulations.Add(this.accumulations[i]);
}
this.accumulations.RemoveRange(startIndex, this.accumulations.Count - startIndex);
}
/// <summary>
/// Move keys to the empty right node when spliting.
/// </summary>
public void MoveKeys(ABTreeNode <TT> right, int startIndex)
{
for (int i = startIndex; i < this.keys.Count; i++)
{
right.keys.Add(this.keys[i]);
}
this.keys.RemoveRange(startIndex, this.keys.Count - startIndex);
}
/// <summary>
/// Inserts key into the tree.
/// If it already contains the key, the key is not inserted.
/// </summary>
/// <param name="key"> A key to insert into the tree.</param>
public void Insert(T key)
{
ABTreeNode <T> node = null;
if (root == null)
{
InitNewRoot(key);
}
// The key was found => no insertion.
else if ((node = FindLeafNode(key, out int pos)) == null)
{
return;
}
/// <summary>
/// Expects that this function is called only when adding new child to a parent after split occurs.
/// Otherwise, it will throw null ptr exception.
/// </summary>
public void InsertBranch(int i, TT value, List <TT> accs, ABTreeNode <TT> child)
{
child.parent = this;
this.keys.Insert(i, value);
this.accumulations.Insert(i, accs);
this.children.Insert(i + 1, child);
// Reset the values of indeces inside.
for (int j = i + 1; j < this.children.Count; j++)
{
this.children[j].index = j;
}
}
/// <summary>
/// Move children to the empty right node when spliting.
/// When moving children, it is important not to forget
/// seting their new parent and theri new indeces as they occur in the parent's children array.
/// </summary>
public void MoveChildren(ABTreeNode <TT> right, int startIndex)
{
ABTreeNode <TT> child = null;
int j = 0;
for (int i = startIndex; i < this.children.Count; i++)
{
child = this.children[i];
child.parent = right;
child.index = j;
right.children.Add(child);
j++;
}
this.children.RemoveRange(startIndex, this.children.Count - startIndex);
}
private void InitNewRoot(T key)
{
root = new ABTreeNode <T>(this.maxChildren);
root.keys.Add(key);
this.Count++;
}