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// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
//
// 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;
using System.Collections.Generic;
using System.Linq;
namespace ICSharpCode.NRefactory.Utils
{
/// <summary>
/// A dictionary that allows multiple pairs with the same key.
/// </summary>
public class MultiDictionary<TKey, TValue> : ILookup<TKey, TValue>
{
readonly Dictionary<TKey, List<TValue>> dict;
public MultiDictionary()
{
dict = new Dictionary<TKey, List<TValue>>();
}
public MultiDictionary(IEqualityComparer<TKey> comparer)
{
dict = new Dictionary<TKey, List<TValue>>(comparer);
}
public void Add(TKey key, TValue value)
{
List<TValue> valueList;
if (!dict.TryGetValue(key, out valueList)) {
valueList = new List<TValue>();
dict.Add(key, valueList);
}
valueList.Add(value);
}
public bool Remove(TKey key, TValue value)
{
List<TValue> valueList;
if (dict.TryGetValue(key, out valueList)) {
if (valueList.Remove(value)) {
if (valueList.Count == 0)
dict.Remove(key);
return true;
}
}
return false;
}
/// <summary>
/// Removes all entries with the specified key.
/// </summary>
/// <returns>Returns true if at least one entry was removed.</returns>
public bool RemoveAll(TKey key)
{
return dict.Remove(key);
}
public void Clear()
{
dict.Clear();
}
#if NET_4_5
public IReadOnlyList<TValue> this[TKey key] {
#else
public IList<TValue> this[TKey key] {
#endif
get {
List<TValue> list;
if (dict.TryGetValue(key, out list))
return list;
else
return EmptyList<TValue>.Instance;
}
}
/// <summary>
/// Returns the number of different keys.
/// </summary>
public int Count {
get { return dict.Count; }
}
public ICollection<TKey> Keys {
get { return dict.Keys; }
}
public IEnumerable<TValue> Values {
get { return dict.Values.SelectMany(list => list); }
}
IEnumerable<TValue> ILookup<TKey, TValue>.this[TKey key] {
get { return this[key]; }
}
bool ILookup<TKey, TValue>.Contains(TKey key)
{
return dict.ContainsKey(key);
}
public IEnumerator<IGrouping<TKey, TValue>> GetEnumerator()
{
foreach (var pair in dict)
yield return new Grouping(pair.Key, pair.Value);
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
sealed class Grouping : IGrouping<TKey, TValue>
{
readonly TKey key;
readonly List<TValue> values;
public Grouping(TKey key, List<TValue> values)
{
this.key = key;
this.values = values;
}
public TKey Key {
get { return key; }
}
public IEnumerator<TValue> GetEnumerator()
{
return values.GetEnumerator();
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return values.GetEnumerator();
}
}
}
}
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