public IndexNodeMutation(int depth, IndexNode node, IIndexNodeFactory indexNodeFactory)
: this(depth, indexNodeFactory)
{
this.original = node;
this.IntraNodeText = node.IntraNodeText;
this.HasMatches = node.HasMatches;
this.HasChildNodes = node.HasChildNodes;
}
public IndexNode CreateNode(IndexNode parent)
{
if (parent is null)
{
throw new ArgumentNullException(nameof(parent));
}
var nextDepth = parent.Depth + 1;
return(new IndexNode(this, nextDepth, this.GetIndexSupportLevelForDepth(nextDepth)));
}
private bool TryRemove(IndexNode node, int itemId, int nodeDepth, [NotNullWhen(true)] out IndexNodeMutation?mutatedNode)
{
mutatedNode = null;
if (node.HasChildNodes)
{
// Work through the child nodes and recursively determine whether removals are needed from
// them. If they are, then this instance will also become mutated.
foreach (var child in node.ChildNodes)
{
if (this.TryRemove(child.Value, itemId, nodeDepth + 1, out var mutatedChild))
{
if (mutatedNode == null)
{
mutatedNode = new IndexNodeMutation(nodeDepth, node, this.indexNodeFactory);
mutatedNode.EnsureMutatedChildNodesCreated();
}
mutatedNode.MutatedChildNodes !.Add(child.Key, mutatedChild);
}
}
}
if (node.HasMatches)
{
// Removing an item from the nodes current matches will return the same dictionary
// if the item didn't exist - this removes the need for an extra Exists check
var mutatedMatches = node.Matches.Remove(itemId);
if (mutatedMatches != node.Matches)
{
if (mutatedNode == null)
{
mutatedNode = new IndexNodeMutation(nodeDepth, node, this.indexNodeFactory);
}
mutatedNode.EnsureMutatedMatchesCreated();
mutatedNode.MutatedMatches !.Remove(itemId);
}
}
return(mutatedNode != null);
}
public IndexMutation(IndexNode root, IIndexNodeFactory indexNodeFactory)
{
this.root = new IndexNodeMutation(0, root, indexNodeFactory);
}