2 // Copyright (c) 2007 James Newton-King
4 // Permission is hereby granted, free of charge, to any person
5 // obtaining a copy of this software and associated documentation
6 // files (the "Software"), to deal in the Software without
7 // restriction, including without limitation the rights to use,
8 // copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the
10 // Software is furnished to do so, subject to the following
13 // The above copyright notice and this permission notice shall be
14 // included in all copies or substantial portions of the Software.
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
18 // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
20 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 // OTHER DEALINGS IN THE SOFTWARE.
27 using System.Collections.Generic;
31 namespace Newtonsoft.Json.Utilities
33 internal class BidirectionalDictionary<TFirst, TSecond>
35 private readonly IDictionary<TFirst, TSecond> _firstToSecond;
36 private readonly IDictionary<TSecond, TFirst> _secondToFirst;
38 public BidirectionalDictionary()
39 : this(EqualityComparer<TFirst>.Default, EqualityComparer<TSecond>.Default)
43 public BidirectionalDictionary(IEqualityComparer<TFirst> firstEqualityComparer, IEqualityComparer<TSecond> secondEqualityComparer)
45 _firstToSecond = new Dictionary<TFirst, TSecond>(firstEqualityComparer);
46 _secondToFirst = new Dictionary<TSecond, TFirst>(secondEqualityComparer);
49 public void Add(TFirst first, TSecond second)
51 if (_firstToSecond.ContainsKey(first) || _secondToFirst.ContainsKey(second))
53 throw new ArgumentException("Duplicate first or second");
55 _firstToSecond.Add(first, second);
56 _secondToFirst.Add(second, first);
59 public bool TryGetByFirst(TFirst first, out TSecond second)
61 return _firstToSecond.TryGetValue(first, out second);
64 public bool TryGetBySecond(TSecond second, out TFirst first)
66 return _secondToFirst.TryGetValue(second, out first);