diff options
Diffstat (limited to 'src/mscorlib/src/System/Collections/ObjectModel/KeyedCollection.cs')
| -rw-r--r-- | src/mscorlib/src/System/Collections/ObjectModel/KeyedCollection.cs | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/src/mscorlib/src/System/Collections/ObjectModel/KeyedCollection.cs b/src/mscorlib/src/System/Collections/ObjectModel/KeyedCollection.cs deleted file mode 100644 index 3fe7716203..0000000000 --- a/src/mscorlib/src/System/Collections/ObjectModel/KeyedCollection.cs +++ /dev/null @@ -1,244 +0,0 @@ -// Licensed to the .NET Foundation under one or more agreements. -// The .NET Foundation licenses this file to you under the MIT license. -// See the LICENSE file in the project root for more information. - -// - -namespace System.Collections.ObjectModel -{ - using System; - using System.Collections.Generic; - using System.Diagnostics; - using System.Diagnostics.Contracts; - - [Serializable] - [DebuggerTypeProxy(typeof(Mscorlib_KeyedCollectionDebugView<,>))] - [DebuggerDisplay("Count = {Count}")] - public abstract class KeyedCollection<TKey,TItem>: Collection<TItem> - { - const int defaultThreshold = 0; - - IEqualityComparer<TKey> comparer; - Dictionary<TKey,TItem> dict; - int keyCount; - int threshold; - - protected KeyedCollection(): this(null, defaultThreshold) {} - - protected KeyedCollection(IEqualityComparer<TKey> comparer): this(comparer, defaultThreshold) {} - - - protected KeyedCollection(IEqualityComparer<TKey> comparer, int dictionaryCreationThreshold) - : base(new List<TItem>()) { // Be explicit about the use of List<T> so we can foreach over - // Items internally without enumerator allocations. - if (comparer == null) { - comparer = EqualityComparer<TKey>.Default; - } - - if (dictionaryCreationThreshold == -1) { - dictionaryCreationThreshold = int.MaxValue; - } - - if( dictionaryCreationThreshold < -1) { - ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.dictionaryCreationThreshold, ExceptionResource.ArgumentOutOfRange_InvalidThreshold); - } - - this.comparer = comparer; - this.threshold = dictionaryCreationThreshold; - } - - /// <summary> - /// Enables the use of foreach internally without allocations using <see cref="List{T}"/>'s struct enumerator. - /// </summary> - new private List<TItem> Items { - get { - Debug.Assert(base.Items is List<TItem>); - - return (List<TItem>)base.Items; - } - } - - public IEqualityComparer<TKey> Comparer { - get { - return comparer; - } - } - - public TItem this[TKey key] { - get { - if( key == null) { - ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key); - } - - if (dict != null) { - return dict[key]; - } - - foreach (TItem item in Items) { - if (comparer.Equals(GetKeyForItem(item), key)) return item; - } - - ThrowHelper.ThrowKeyNotFoundException(); - return default(TItem); - } - } - - public bool Contains(TKey key) { - if( key == null) { - ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key); - } - - if (dict != null) { - return dict.ContainsKey(key); - } - - foreach (TItem item in Items) { - if (comparer.Equals(GetKeyForItem(item), key)) return true; - } - return false; - } - - private bool ContainsItem(TItem item) { - TKey key; - if( (dict == null) || ((key = GetKeyForItem(item)) == null)) { - return Items.Contains(item); - } - - TItem itemInDict; - bool exist = dict.TryGetValue(key, out itemInDict); - if( exist) { - return EqualityComparer<TItem>.Default.Equals(itemInDict, item); - } - return false; - } - - public bool Remove(TKey key) { - if( key == null) { - ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key); - } - - if (dict != null) { - if (dict.ContainsKey(key)) { - return Remove(dict[key]); - } - - return false; - } - - for (int i = 0; i < Items.Count; i++) { - if (comparer.Equals(GetKeyForItem(Items[i]), key)) { - RemoveItem(i); - return true; - } - } - return false; - } - - protected IDictionary<TKey,TItem> Dictionary { - get { return dict; } - } - - protected void ChangeItemKey(TItem item, TKey newKey) { - // check if the item exists in the collection - if( !ContainsItem(item)) { - ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_ItemNotExist); - } - - TKey oldKey = GetKeyForItem(item); - if (!comparer.Equals(oldKey, newKey)) { - if (newKey != null) { - AddKey(newKey, item); - } - - if (oldKey != null) { - RemoveKey(oldKey); - } - } - } - - protected override void ClearItems() { - base.ClearItems(); - if (dict != null) { - dict.Clear(); - } - - keyCount = 0; - } - - protected abstract TKey GetKeyForItem(TItem item); - - protected override void InsertItem(int index, TItem item) { - TKey key = GetKeyForItem(item); - if (key != null) { - AddKey(key, item); - } - base.InsertItem(index, item); - } - - protected override void RemoveItem(int index) { - TKey key = GetKeyForItem(Items[index]); - if (key != null) { - RemoveKey(key); - } - base.RemoveItem(index); - } - - protected override void SetItem(int index, TItem item) { - TKey newKey = GetKeyForItem(item); - TKey oldKey = GetKeyForItem(Items[index]); - - if (comparer.Equals(oldKey, newKey)) { - if (newKey != null && dict != null) { - dict[newKey] = item; - } - } - else { - if (newKey != null) { - AddKey(newKey, item); - } - - if (oldKey != null) { - RemoveKey(oldKey); - } - } - base.SetItem(index, item); - } - - private void AddKey(TKey key, TItem item) { - if (dict != null) { - dict.Add(key, item); - } - else if (keyCount == threshold) { - CreateDictionary(); - dict.Add(key, item); - } - else { - if (Contains(key)) { - ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_AddingDuplicate); - } - - keyCount++; - } - } - - private void CreateDictionary() { - dict = new Dictionary<TKey,TItem>(comparer); - foreach (TItem item in Items) { - TKey key = GetKeyForItem(item); - if (key != null) { - dict.Add(key, item); - } - } - } - - private void RemoveKey(TKey key) { - Debug.Assert(key != null, "key shouldn't be null!"); - if (dict != null) { - dict.Remove(key); - } - else { - keyCount--; - } - } - } -} |