/// <summary>
/// Загрузка словаря из потока
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static async Task<Trie> LoadAsync(StreamReader reader)
{
if (reader == null || reader.EndOfStream)
throw new ArgumentException("Incorrect StreamReader state");
Trie result = new Trie();
string currentLine = await reader.ReadLineAsync();
int wordsCount = 0;
if (!int.TryParse(currentLine, out wordsCount))
throw new FormatException("Incorrect input data format. In first line must be dictionary size");
if (wordsCount <= 0 || wordsCount > 100000)
throw new FormatException("Incorrect input data format. Dictionary size should be greater than zero and less then 100 000");
for (int i = 0; i < wordsCount; i++)
{
currentLine = await reader.ReadLineAsync();
if (string.IsNullOrEmpty(currentLine))
throw new FormatException("Incorrect input data format. Too less lines or empty line");
string[] current = currentLine.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (current.Length != 2)
throw new FormatException("Incorrect input data format. Lines with words must contains word and occurrence delimeted by space");
if (current[0].Length > 15)
throw new FormatException("Incorrect input data format. Words must contains less than 16 letters");
int occurrence = int.Parse(current[1]);
if (occurrence <= 0 || occurrence > 1000000)
throw new FormatException("Incorrect input data format. Word Occerrnce should be greater than zero and less then 1 000 000");
result.Add(current[0], occurrence);
}
return result;
}
/// <summary>
/// Инициализация словаря
/// </summary>
/// <returns></returns>
private static async Task InitDictionaryAsync()
{
using (FileStream stream = File.OpenRead(_path))
{
using (StreamReader reader = new StreamReader(stream))
{
_dictionary = await TrieLoader.LoadAsync(reader);
}
}
}
