Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / ObjectModel / KeyedCollection.cs / 1 / KeyedCollection.cs
namespace System.Collections.ObjectModel { using System; using System.Collections.Generic; using System.Diagnostics; [Serializable()] [System.Runtime.InteropServices.ComVisible(false)] [DebuggerTypeProxy(typeof(Mscorlib_KeyedCollectionDebugView<,>))] [DebuggerDisplay("Count = {Count}")] public abstract class KeyedCollection: Collection { const int defaultThreshold = 0; IEqualityComparer comparer; Dictionary dict; int keyCount; int threshold; protected KeyedCollection(): this(null, defaultThreshold) {} protected KeyedCollection(IEqualityComparer comparer): this(comparer, defaultThreshold) {} protected KeyedCollection(IEqualityComparer comparer, int dictionaryCreationThreshold) { if (comparer == null) { comparer = EqualityComparer .Default; } if (dictionaryCreationThreshold == -1) { dictionaryCreationThreshold = int.MaxValue; } if( dictionaryCreationThreshold < -1) { ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.dictionaryCreationThreshold, ExceptionResource.ArgumentOutOfRange_InvalidThreshold); } this.comparer = comparer; this.threshold = dictionaryCreationThreshold; } public IEqualityComparer 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); } if (key != null) { 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 .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; } if (key != null) { for (int i = 0; i < Items.Count; i++) { if (comparer.Equals(GetKeyForItem(Items[i]), key)) { RemoveItem(i); return true; } } } return false; } protected IDictionary 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 (comparer); foreach (TItem item in Items) { TKey key = GetKeyForItem(item); if (key != null) { dict.Add(key, item); } } } private void RemoveKey(TKey key) { BCLDebug.Assert(key != null, "key shouldn't be null!"); if (dict != null) { dict.Remove(key); } else { keyCount--; } } } }
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