/// <summary>
/// Recognizes named entities occurring in content text that recorded in the dictionary.
/// </summary>
/// <param name="content">The content string to recognize the named entities.</param>
/// <returns>A set of <see cref="NamedEntityInfo<T>"/> represents named entities that is recognized from the content text.</returns>
public IList <NamedEntityInfo <T> > Recognize(string content)
{
content = content.ToLower();
IList <string> tokens = NamedEntityDictionary <T> .Tokenize(content);
IList <NamedEntityInfo <T> > result = new List <NamedEntityInfo <T> >();
int contentIndex = 0;
while (tokens.Count > 0)
{
PrefixMatch <string, T> match = this.prefixTree.LongestPrefixMatch(tokens);
if (match.Length == 0)
{
contentIndex += tokens[0].Length;
tokens.RemoveAt(0);
continue;
}
int termLength = 0;
for (int index = 0; index < match.Length; index++)
{
termLength += tokens[0].Length;
tokens.RemoveAt(0);
}
NamedEntityInfo <T> entity =
new NamedEntityInfo <T>(match.Value, contentIndex, termLength);
result.Add(entity);
contentIndex += termLength;
}
return(result);
}
/// <summary>
/// Removes the value with the specified key from the dictionary.
/// </summary>
/// <param name="key">The key of the element to remove.</param>
/// <returns>True if the element is successfully found and removed; otherwise, false. This method returns false if key is not found in the dictionary.</returns>
public override bool Remove(string key)
{
key = key.ToLower();
bool dictResult = this.dictionary.Remove(key);
bool treeResult = this.prefixTree.Remove(NamedEntityDictionary <T> .Tokenize(key));
Debug.Assert(dictResult == treeResult);
return(treeResult);
}
/// <summary>
/// Gets or sets the value associated with the specified key.
/// </summary>
/// <param name="key">The key of the value to get or set.</param>
public override T this[string key]
{
get { return(this.dictionary[key.ToLower()]); }
set
{
key = key.ToLower();
this.prefixTree.TrySetValue(NamedEntityDictionary <T> .Tokenize(key), value);
this.dictionary[key] = value;
}
}
/// <summary>
/// Adds the specified key and value to the dictionary.
/// </summary>
/// <param name="key">The key of the element to add.</param>
/// <param name="value">The value of the element to add. The value can be null for reference types.</param>
public override void Add(string key, T value)
{
key = key.ToLower();
this.prefixTree.SetValue(NamedEntityDictionary <T> .Tokenize(key), value);
this.dictionary.Add(key, value);
}
