Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / SynchronizedKeyedCollection.cs / 1 / SynchronizedKeyedCollection.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Collections.Generic { using System; using System.Diagnostics; using System.ServiceModel; [System.Runtime.InteropServices.ComVisible(false)] public abstract class SynchronizedKeyedCollection: SynchronizedCollection { const int defaultThreshold = 0; IEqualityComparer comparer; Dictionary dictionary; int keyCount; int threshold; protected SynchronizedKeyedCollection() { this.comparer = EqualityComparer .Default; this.threshold = int.MaxValue; } protected SynchronizedKeyedCollection(object syncRoot) : base(syncRoot) { this.comparer = EqualityComparer .Default; this.threshold = int.MaxValue; } protected SynchronizedKeyedCollection(object syncRoot, IEqualityComparer comparer) : base(syncRoot) { if (comparer == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("comparer")); this.comparer = comparer; this.threshold = int.MaxValue; } protected SynchronizedKeyedCollection(object syncRoot, IEqualityComparer comparer, int dictionaryCreationThreshold) : base(syncRoot) { if (comparer == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("comparer")); if (dictionaryCreationThreshold < -1) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("dictionaryCreationThreshold", dictionaryCreationThreshold, SR.GetString(SR.ValueMustBeInRange, -1, int.MaxValue))); else if (dictionaryCreationThreshold == -1) this.threshold = int.MaxValue; else this.threshold = dictionaryCreationThreshold; this.comparer = comparer; } public T this[K key] { get { if (key == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("key")); lock (this.SyncRoot) { if (this.dictionary != null) return this.dictionary[key]; for (int i = 0; i < this.Items.Count; i++) { T item = this.Items[i]; if (this.comparer.Equals(key, this.GetKeyForItem(item))) return item; } throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new KeyNotFoundException()); } } } protected IDictionary Dictionary { get { return this.dictionary; } } void AddKey(K key, T item) { if (this.dictionary != null) this.dictionary.Add(key, item); else if (this.keyCount == this.threshold) { this.CreateDictionary(); this.dictionary.Add(key, item); } else { if (this.Contains(key)) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.CannotAddTwoItemsWithTheSameKeyToSynchronizedKeyedCollection0))); this.keyCount++; } } protected void ChangeItemKey(T item, K newKey) { // check if the item exists in the collection if (!this.ContainsItem(item)) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.ItemDoesNotExistInSynchronizedKeyedCollection0))); K oldKey = this.GetKeyForItem(item); if (!this.comparer.Equals(newKey, oldKey)) { if (newKey != null) this.AddKey(newKey, item); if (oldKey != null) this.RemoveKey(oldKey); } } protected override void ClearItems() { base.ClearItems(); if (this.dictionary != null) this.dictionary.Clear(); this.keyCount = 0; } public bool Contains(K key) { if (key == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("key")); lock (this.SyncRoot) { if (this.dictionary != null) return this.dictionary.ContainsKey(key); if (key != null) { for (int i = 0; i < Items.Count; i++) { T item = Items[i]; if (this.comparer.Equals(key, GetKeyForItem(item))) return true; } } return false; } } bool ContainsItem(T item) { K key; if ((this.dictionary == null) || ((key = GetKeyForItem(item)) == null)) return Items.Contains(item); T itemInDict; if (this.dictionary.TryGetValue(key, out itemInDict)) return EqualityComparer .Default.Equals(item, itemInDict); return false; } void CreateDictionary() { this.dictionary = new Dictionary (this.comparer); foreach (T item in Items) { K key = GetKeyForItem(item); if (key != null) this.dictionary.Add(key, item); } } protected abstract K GetKeyForItem(T item); protected override void InsertItem(int index, T item) { K key = this.GetKeyForItem(item); if (key != null) this.AddKey(key, item); base.InsertItem(index, item); } public bool Remove(K key) { if (key == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("key")); lock (this.SyncRoot) { if (this.dictionary != null) { if (this.dictionary.ContainsKey(key)) return this.Remove(this.dictionary[key]); else return false; } else { for (int i=0; i < Items.Count; i++) { if (comparer.Equals(key, GetKeyForItem(Items[i]))) { this.RemoveItem(i); return true; } } return false; } } } protected override void RemoveItem(int index) { K key = this.GetKeyForItem(this.Items[index]); if (key != null) this.RemoveKey(key); base.RemoveItem(index); } void RemoveKey(K key) { if (!(key != null)) { DiagnosticUtility.DebugAssert("key shouldn't be null!"); throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("key"); } if (this.dictionary != null) this.dictionary.Remove(key); else this.keyCount--; } protected override void SetItem(int index, T item) { K newKey = this.GetKeyForItem(item); K oldKey = this.GetKeyForItem(this.Items[index]); if (this.comparer.Equals(newKey, oldKey)) { if ((newKey != null) && (this.dictionary != null)) this.dictionary[newKey] = item; } else { if (newKey != null) this.AddKey(newKey, item); if (oldKey != null) this.RemoveKey(oldKey); } base.SetItem(index, item); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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