public static RadixTrieNode AddChild(RadixTrieNode parent, string key, object value)
{
var childNode = CreateChildNode(key, value);
AddChild(parent, childNode);
return(childNode);
}
//add
public void Add(string key, object value)
{
int index = 0;
RadixTrieNode parent = this.root;
while (index < key.Length)
{
string token = key.Substring(index, key.Length - index);
//if there are no child add a new node
if (parent.Children == null || parent.Children.Count == 0)
{
RadixNodeUtils.AddChild(parent, key, value);
return;
}
foreach (var child in parent.Children)
{
int prefixLength = this.GetPrefixLength(token, child.Key);
////if common is 0 then add new token
//if (prefixLength == 0)
//{
// RadixNodeUtils.AddChild(parent, token, value);
// break;
//}
//if common is same as token length, then make sure node is marked as terminal
if (prefixLength == token.Length)
{
child.Value = value;
return;
}
//see if the key needs to be resized; not always, what if needs to be used
if (prefixLength < child.Key.Length)
{
RadixNodeUtils.SplitParent(child, prefixLength, token, value);
return;
}
}
//no matching prefix
RadixNodeUtils.AddChild(parent, token, value);
}
//get longest
}
public static void AddChild(RadixTrieNode parent, params RadixTrieNode[] children)
{
if (parent == null)
{
throw new ArgumentNullException("parent");
}
if (parent.Children == null)
{
parent.Children = CreateChildCollection();
}
foreach (var child in children)
{
parent.Children.Add(child);
}
}
public static void SplitParent(RadixTrieNode parent, int prefixLength, string key, object value)
{
//get the new leaf key
string newLeafKey = parent.Key.Substring(prefixLength, parent.Key.Length - prefixLength);
//get the new parent key
string newParentKey = parent.Key.Substring(0, prefixLength);
//get the new child key
string newChildKey = key.Substring(prefixLength, key.Length - prefixLength);
//create new leaf node
RadixTrieNode newLeafNode = CreateChildNode(newLeafKey, parent.Value);
//create new leaf node
RadixTrieNode newChildNode = CreateChildNode(newChildKey, value);
//modify parent node (maybe this should be refactored to use immutable object)
parent.Key = newParentKey;
parent.Value = null;
AddChild(parent, newLeafNode, newChildNode);
}
