/// <summary>
/// Merge current node with <paramref name="newNext"/>, the nodes between this and <paramref name="newNext"/> are abandoned.
/// 合并当前结点与<paramref name="newNext"/>， 之间的结点将会被抛弃
/// </summary>
/// <param name="newNext">需要被合并的结点，请保证它是当前结点的后继</param>
/// <param name="startIndex">合并的结点开始合并的数据位置</param>
public void Merge(UnrolledLinkedListNode <TData> newNext, int startIndex)
{
Contract.Requires <ArgumentNullException>(newNext != null);
Contract.Requires <ArgumentOutOfRangeException>(startIndex >= 0 && startIndex <= Count);
Contract.Ensures(Contract.OldValue(newNext.Next) == Next);
if (newNext == this)
{
return;
}
if (newNext.Count > 0)
{
var copycount = newNext.Count - startIndex;
Array.Copy(newNext._items, startIndex, _items, Count, copycount);
if (_rmref)
{
Array.Clear(newNext._items, 0, startIndex);
}
Count += copycount;
}
Next = newNext.Next;
Update();
}
public BackEnumerator(UnrolledLinkedList <TNode, TData> list)
{
this.list = list;
cnode = null;
current = default(TData);
index = 0;
version = list.Version;
}
public void Clear()
{
head = _new(blocksize);
head.Next = head;
Count = 0;
_hotindex = 0;
_hotnode = null;
Version++;
}
public void Reset()
{
if (version != list.Version)
{
throw new InvalidOperationException("在枚举过程中集合被修改过");
}
current = default(TData);
cnode = null;
}
public UnrolledLinkedList(Func <int, TNode> newNode, int capacity)
{
Contract.Requires <ArgumentNullException>(newNode != null);
Contract.Requires <ArgumentException>(capacity >= 0);
if (capacity < _minCapacity)
{
capacity = _minCapacity;
}
_new = newNode;
blocksize = (int)Math.Ceiling(_splitFactor * Math.Sqrt(capacity));
head = _new(blocksize);
head.Next = head;
}
public bool MoveNext()
{
if (version != list.Version)
{
throw new InvalidOperationException("在枚举过程中集合被修改过");
}
if (cnode == null)
{
cnode = list.head.Previous;
index = cnode.Count - 1;
if (list.Count == 0)
{
return(false);
}
current = cnode._items[index--];
return(true);
}
else
{
if (index >= 0)
{
current = cnode._items[index--];
return(true);
}
else
{
if (cnode == list.head)
{
return(false);
}
cnode = cnode.Previous;
index = cnode.Count - 1;
current = cnode._items[index--];
return(true);
}
}
}
private void FixNode(UnrolledLinkedListNode <TData> node)
{
if (node.Count < node.Capacity * MergeFactor)
{
if (node.Next != head && node.Count + node.Next.Count <= node.Capacity)
{
if (node.Next == _hotnode) // update hot
{
_hotindex -= node.Count;
_hotnode = node;
}
node.Merge(node.Next);
}
if (node != head && node.Count + node.Previous.Count <= node.Previous.Capacity)
{
if (node == _hotnode) // update hot
{
_hotnode = node.Previous;
_hotindex -= _hotnode.Count;
}
node.Previous.Merge(node);
}
}
}
private UnrolledLinkedListNode <TData> Find(ref int index)
{
if (index < _hotindex)
{
if (index < _hotindex - index) // front -> hotindex
{
_hotindex = index;
_hotnode = head;
while (index >= _hotnode.Count)
{
index -= _hotnode.Count;
_hotnode = _hotnode.Next;
}
_hotindex -= index;
return(_hotnode);
}
else // hotindex -> front
{
var temp = index;
_hotnode = _hotnode.Previous;
index = _hotindex - index;
while (index > _hotnode.Count)
{
index -= _hotnode.Count;
_hotnode = _hotnode.Previous;
}
index = _hotnode.Count - index;
_hotindex = temp - index;
return(_hotnode);
}
}
else
{
if (index - _hotindex < Count - index) // hotindex -> end
{
var temp = index;
if (_hotnode == null)
{
_hotnode = head;
}
index -= _hotindex;
while (index >= _hotnode.Count)
{
index -= _hotnode.Count;
_hotnode = _hotnode.Next;
}
_hotindex = temp - index;
return(_hotnode);
}
else // end -> hotindex
{
_hotindex = index;
_hotnode = head.Previous;
index = Count - index;
while (index > _hotnode.Count)
{
index -= _hotnode.Count;
_hotnode = _hotnode.Previous;
}
index = _hotnode.Count - index;
_hotindex -= index;
return(_hotnode);
}
}
}
public void Merge(UnrolledLinkedListNode <TData> newNext)
{
Contract.Requires <ArgumentNullException>(newNext != null);
Contract.Ensures(Contract.OldValue(newNext.Next) == Next);
Merge(newNext, 0);
}
