/// <summary>
/// Reads the fileName input file of allowable words and adds them to trie.
/// </summary>
/// <param name="fileName">Name of file to be read.</param>
/// <returns>Whether the file was successfully read.</returns>
public bool ReadDictionary(string fileName)
{
try
{
using (StreamReader sr = new StreamReader(fileName))
{
ITrie temp = new TrieWithNoChildren();
while (!sr.EndOfStream)
{
string word = sr.ReadLine().Trim().ToLower();
temp = temp.Add(word);
}
_words = temp;
}
return(true);
}
catch
{
return(false);
}
}
/// <summary>
/// Adds a word to this trie (no change is made if the word is already there)
/// </summary>
/// <param name="s">The word to add</param>
/// <returns>The updated trie</returns>
public ITrie Add(string s)
{
if (s == "")
{
_isWord = true;
}
else if (s[0] < 'a' || s[0] > 'z')
{
throw new ArgumentException();
}
else
{
int loc = s[0] - 'a';
if (_children[loc] == null)
{
_children[loc] = new TrieWithNoChildren();
}
_children[loc] = _children[loc].Add(s.Substring(1));
}
return(this);
}