public bool Seek(Slice key)
{
if (this.ValidateCurrentKey(Current, _cmp) == false)
{
return(false);
}
CurrentKey = NodeHeader.GetData(_tx, _item);
return(true);
}
public void MultiAdd(Transaction tx, Slice key, Slice value, ushort?version = null)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (value.Size > tx.DataPager.MaxNodeSize)
{
throw new ArgumentException(
"Cannot add a value to child tree that is over " + tx.DataPager.MaxNodeSize + " bytes in size", "value");
}
if (value.Size == 0)
{
throw new ArgumentException("Cannot add empty value to child tree");
}
State.IsModified = true;
Lazy <Cursor> lazy;
var page = FindPageFor(tx, key, out lazy);
if (page == null || page.LastMatch != 0)
{
var ptr = DirectAdd(tx, key, value.Size, version: version);
value.CopyTo(ptr);
return;
}
page = tx.ModifyPage(page.PageNumber, page);
var item = page.GetNode(page.LastSearchPosition);
CheckConcurrency(key, version, item->Version, TreeActionType.Add);
var existingValue = new Slice(DirectRead(tx, key), (ushort)item->DataSize);
if (existingValue.Compare(value, _cmp) == 0)
{
return; //nothing to do, the exact value is already there
}
if (item->Flags == NodeFlags.MultiValuePageRef)
{
var tree = OpenOrCreateMultiValueTree(tx, key, item);
tree.DirectAdd(tx, value, 0);
}
else // need to turn to tree
{
var tree = Create(tx, _cmp, TreeFlags.MultiValue);
var current = NodeHeader.GetData(tx, item);
tree.DirectAdd(tx, current, 0);
tree.DirectAdd(tx, value, 0);
tx.AddMultiValueTree(this, key, tree);
// we need to record that we switched to tree mode here, so the next call wouldn't also try to create the tree again
DirectAdd(tx, key, sizeof(TreeRootHeader), NodeFlags.MultiValuePageRef);
}
}
public void MultiAdd(Transaction tx, Slice key, Slice value)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (value.Size > tx.Pager.MaxNodeSize)
{
throw new ArgumentException("Cannot add a value to child tree that is over " + tx.Pager.MaxNodeSize + " bytes in size", "value");
}
if (value.Size == 0)
{
throw new ArgumentException("Cannot add empty value to child tree");
}
using (var cursor = tx.NewCursor(this))
{
var page = FindPageFor(tx, key, cursor);
if (page == null || page.LastMatch != 0)
{
var ptr = DirectAdd(tx, key, value.Size);
value.CopyTo(ptr);
return;
}
var txInfo = tx.GetTreeInformation(this);
page = tx.ModifyCursor(txInfo, cursor);
var item = page.GetNode(page.LastSearchPosition);
if (item->Flags == NodeFlags.MultiValuePageRef)
{
var tree = OpenOrCreateMultiValueTree(tx, key, item);
tree.DirectAdd(tx, value, 0);
}
else // need to turn to tree
{
var tree = Create(tx, _cmp, TreeFlags.MultiValue);
var current = NodeHeader.GetData(tx, item);
tree.DirectAdd(tx, current, 0);
tree.DirectAdd(tx, value, 0);
tx.AddMultiValueTree(this, key, tree);
DirectAdd(tx, key, sizeof(TreeRootHeader));
cursor.Clear();
page = FindPageFor(tx, key, cursor);
Debug.Assert(page.LastMatch == 0);
page.GetNode(page.LastSearchPosition)->Flags = NodeFlags.MultiValuePageRef;
}
}
}
