public TreeDataInTransaction GetTreeInformation(Tree tree)
{
// ReSharper disable once PossibleUnintendedReferenceComparison
if (tree == _env.Root)
{
return(_rootTreeData ?? (_rootTreeData = new TreeDataInTransaction(_env.Root)
{
RootPageNumber = _env.Root.State.RootPageNumber
}));
}
// ReSharper disable once PossibleUnintendedReferenceComparison
if (tree == _env.FreeSpaceRoot)
{
return(_fresSpaceTreeData ?? (_fresSpaceTreeData = new TreeDataInTransaction(_env.FreeSpaceRoot)
{
RootPageNumber = _env.FreeSpaceRoot.State.RootPageNumber
}));
}
TreeDataInTransaction c;
if (_treesInfo.TryGetValue(tree, out c))
{
return(c);
}
c = new TreeDataInTransaction(tree)
{
RootPageNumber = tree.State.RootPageNumber
};
_treesInfo.Add(tree, c);
return(c);
}
public Page ModifyCursor(TreeDataInTransaction txInfo, Cursor c)
{
Debug.Assert(c.Pages.Count > 0); // cannot modify an empty cursor
var node = c.Pages.Last;
while (node != null)
{
var parent = node.Next != null ? node.Next.Value : null;
c.Update(node, ModifyPage(txInfo.Tree, parent, node.Value.PageNumber, c));
node = node.Previous;
}
txInfo.RootPageNumber = c.Pages.Last.Value.PageNumber;
return(c.Pages.First.Value);
}
internal void UpdateRoots(Tree root, Tree freeSpace)
{
if (_treesInfo.TryGetValue(root, out _rootTreeData))
{
_treesInfo.Remove(root);
}
else
{
_rootTreeData = new TreeDataInTransaction(root);
}
if (_treesInfo.TryGetValue(freeSpace, out _fresSpaceTreeData))
{
_treesInfo.Remove(freeSpace);
}
else
{
_fresSpaceTreeData = new TreeDataInTransaction(freeSpace);
}
}
