public static MemoryTreeNode GetOrLoadNode(TreeFile TreeFile, MemoryTreeNode ParentNode, NodePointer Pointer)
{
if (Pointer.IsFirstPreviousPointer)
{
if (ParentNode.PreviousPointer != null)
{
return(ParentNode.PreviousPointer);
}
else
{
TreeNode node = TreeFile.ReadNode(Pointer.PositionPointer);
if (node == null)
{
return(null);
}
MemoryTreeNode newcachenode = new MemoryTreeNode(node);
newcachenode.Parent = ParentNode;
newcachenode.IsParentPreviousPointer = Pointer.IsFirstPreviousPointer;
newcachenode.ParentNodeKey = Pointer.KeyToPosition;
newcachenode.Level = ParentNode.Level + 1;
if (newcachenode.Level < TreeFile.MaxCacheLevel)
{
ParentNode.PreviousPointer = newcachenode;
}
return(newcachenode);
}
}
else
{
if (ParentNode.Children.ContainsKey(Pointer.PositionPointer))
{
return(ParentNode.Children[Pointer.PositionPointer]);
}
else
{
TreeNode node = TreeFile.ReadNode(Pointer.PositionPointer);
if (node == null)
{
return(null);
}
MemoryTreeNode newcachenode = new MemoryTreeNode(node);
newcachenode.Parent = ParentNode;
newcachenode.IsParentPreviousPointer = Pointer.IsFirstPreviousPointer;
newcachenode.ParentNodeKey = Pointer.KeyToPosition;
newcachenode.Level = ParentNode.Level + 1;
if (newcachenode.Level < TreeFile.MaxCacheLevel)
{
ParentNode.Children[Pointer.PositionPointer] = newcachenode;
}
return(newcachenode);
}
}
}
public static void NodeChange(TreeFile tree, MemoryTreeNode node)
{
if (node == null)
{
return;
}
if (node.TreeNode.TypeIndicator == EnumValues.TypeIndicator.root)
{
var treenode = tree.ReadNode(node.TreeNode.DiskPosition);
var newrootcache = new MemoryTreeNode(treenode);
tree.RootCache = newrootcache;
}
else
{
var parent = node.Parent;
if (parent != null)
{
if (node.IsParentPreviousPointer)
{
parent.PreviousPointer = null;
}
else
{
parent.Children.Remove(node.TreeNode.DiskPosition);
}
}
}
node = null;
}
public static void NodeReload(TreeFile tree, MemoryTreeNode node)
{
var newnode = tree.ReadNode(node.TreeNode.DiskPosition);
node.TreeNode = newnode;
}