/**
* <summary>Replace words not in given dictionary.
* Deletes unknown words from children nodes and adds them to {@link NGramNode#unknown} unknown node as children recursively.</summary>
*
* <param name="dictionary">dictionary of known words.</param>
*/
public void ReplaceUnknownWords(HashSet <TSymbol> dictionary)
{
if (_children != null)
{
var childList = new List <NGramNode <TSymbol> >();
foreach (var s in _children.Keys)
{
if (!dictionary.Contains(s))
{
childList.Add(_children[s]);
}
}
if (childList.Count > 0)
{
_unknown = new NGramNode <TSymbol>(default(TSymbol));
_unknown._children = new Dictionary <TSymbol, NGramNode <TSymbol> >();
var sum = 0;
foreach (var child in childList)
{
if (child._children != null)
{
foreach (var(key, value) in child._children)
{
_unknown._children.Add(key, value);
}
}
sum += child._count;
_children.Remove(child._symbol);
}
_unknown._count = sum;
_unknown.ReplaceUnknownWords(dictionary);
}
foreach (var child in _children.Values)
{
child.ReplaceUnknownWords(dictionary);
}
}
}
/**
* <summary>Replaces words not in {@link HashSet} given dictionary.</summary>
*
* <param name="dictionary">dictionary of known words.</param>
*/
public void ReplaceUnknownWords(HashSet <TSymbol> dictionary)
{
rootNode.ReplaceUnknownWords(dictionary);
}