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//
// DoubleDictionary.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections.Generic;
using System.Linq;
namespace Mono.CodeContracts.Static.DataStructures {
class DoubleDictionary<A, B, C> : Dictionary<A, Dictionary<B, C>> {
public C this [A a, B b]
{
get { return base [a] [b]; }
set
{
Dictionary<B, C> dict;
if (!base.TryGetValue (a, out dict)) {
dict = new Dictionary<B, C> ();
base.Add (a, dict);
}
dict [b] = value;
}
}
public IEnumerable<A> Keys1
{
get { return base.Keys; }
}
public void Add (A a, B b, C value)
{
Dictionary<B, C> dict;
if (!base.TryGetValue (a, out dict)) {
dict = new Dictionary<B, C> ();
base.Add (a, dict);
}
dict.Add (b, value);
}
public IEnumerable<B> Keys2 (A a)
{
Dictionary<B, C> dict;
if (base.TryGetValue (a, out dict))
return dict.Keys;
return Enumerable.Empty<B> ();
}
public bool ContainsKey (A a, B b)
{
Dictionary<B, C> dict;
if (!base.TryGetValue (a, out dict))
return false;
return dict.ContainsKey (b);
}
public bool TryGetValue (A a, B b, out C value)
{
Dictionary<B, C> dict;
if (base.TryGetValue (a, out dict))
return dict.TryGetValue (b, out value);
value = default(C);
return false;
}
}
}
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