Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Collections / Specialized / ListDictionary.cs / 1 / ListDictionary.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Collections.Specialized { using System.Collections; using Microsoft.Win32; ////// [Serializable] public class ListDictionary: IDictionary { DictionaryNode head; int version; int count; IComparer comparer; [NonSerialized] private Object _syncRoot; ////// This is a simple implementation of IDictionary using a singly linked list. This /// will be smaller and faster than a Hashtable if the number of elements is 10 or less. /// This should not be used if performance is important for large numbers of elements. /// ////// public ListDictionary() { } ///[To be supplied.] ////// public ListDictionary(IComparer comparer) { this.comparer = comparer; } ///[To be supplied.] ////// public object this[object key] { get { if (key == null) { throw new ArgumentNullException("key", SR.GetString(SR.ArgumentNull_Key)); } DictionaryNode node = head; if (comparer == null) { while (node != null) { object oldKey = node.key; if ( oldKey!= null && oldKey.Equals(key)) { return node.value; } node = node.next; } } else { while (node != null) { object oldKey = node.key; if (oldKey != null && comparer.Compare(oldKey, key) == 0) { return node.value; } node = node.next; } } return null; } set { if (key == null) { throw new ArgumentNullException("key", SR.GetString(SR.ArgumentNull_Key)); } version++; DictionaryNode last = null; DictionaryNode node; for (node = head; node != null; node = node.next) { object oldKey = node.key; if ((comparer == null) ? oldKey.Equals(key) : comparer.Compare(oldKey, key) == 0) { break; } last = node; } if (node != null) { // Found it node.value = value; return; } // Not found, so add a new one DictionaryNode newNode = new DictionaryNode(); newNode.key = key; newNode.value = value; if (last != null) { last.next = newNode; } else { head = newNode; } count++; } } ///[To be supplied.] ////// public int Count { get { return count; } } ///[To be supplied.] ////// public ICollection Keys { get { return new NodeKeyValueCollection(this, true); } } ///[To be supplied.] ////// public bool IsReadOnly { get { return false; } } ///[To be supplied.] ////// public bool IsFixedSize { get { return false; } } ///[To be supplied.] ////// public bool IsSynchronized { get { return false; } } ///[To be supplied.] ////// public object SyncRoot { get { if( _syncRoot == null) { System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null); } return _syncRoot; } } ///[To be supplied.] ////// public ICollection Values { get { return new NodeKeyValueCollection(this, false); } } ///[To be supplied.] ////// public void Add(object key, object value) { if (key == null) { throw new ArgumentNullException("key", SR.GetString(SR.ArgumentNull_Key)); } version++; DictionaryNode last = null; DictionaryNode node; for (node = head; node != null; node = node.next) { object oldKey = node.key; if ((comparer == null) ? oldKey.Equals(key) : comparer.Compare(oldKey, key) == 0) { throw new ArgumentException(SR.GetString(SR.Argument_AddingDuplicate)); } last = node; } // Not found, so add a new one DictionaryNode newNode = new DictionaryNode(); newNode.key = key; newNode.value = value; if (last != null) { last.next = newNode; } else { head = newNode; } count++; } ///[To be supplied.] ////// public void Clear() { count = 0; head = null; version++; } ///[To be supplied.] ////// public bool Contains(object key) { if (key == null) { throw new ArgumentNullException("key", SR.GetString(SR.ArgumentNull_Key)); } for (DictionaryNode node = head; node != null; node = node.next) { object oldKey = node.key; if ((comparer == null) ? oldKey.Equals(key) : comparer.Compare(oldKey, key) == 0) { return true; } } return false; } ///[To be supplied.] ////// public void CopyTo(Array array, int index) { if (array==null) throw new ArgumentNullException("array"); if (index < 0) throw new ArgumentOutOfRangeException("index", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNum)); if (array.Length - index < count) throw new ArgumentException(SR.GetString(SR.Arg_InsufficientSpace)); for (DictionaryNode node = head; node != null; node = node.next) { array.SetValue(new DictionaryEntry(node.key, node.value), index); index++; } } ///[To be supplied.] ////// public IDictionaryEnumerator GetEnumerator() { return new NodeEnumerator(this); } IEnumerator IEnumerable.GetEnumerator() { return new NodeEnumerator(this); } ///[To be supplied.] ////// public void Remove(object key) { if (key == null) { throw new ArgumentNullException("key", SR.GetString(SR.ArgumentNull_Key)); } version++; DictionaryNode last = null; DictionaryNode node; for (node = head; node != null; node = node.next) { object oldKey = node.key; if ((comparer == null) ? oldKey.Equals(key) : comparer.Compare(oldKey, key) == 0) { break; } last = node; } if (node == null) { return; } if (node == head) { head = node.next; } else { last.next = node.next; } count--; } private class NodeEnumerator : IDictionaryEnumerator { ListDictionary list; DictionaryNode current; int version; bool start; public NodeEnumerator(ListDictionary list) { this.list = list; version = list.version; start = true; current = null; } public object Current { get { return Entry; } } public DictionaryEntry Entry { get { if (current == null) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumOpCantHappen)); } return new DictionaryEntry(current.key, current.value); } } public object Key { get { if (current == null) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumOpCantHappen)); } return current.key; } } public object Value { get { if (current == null) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumOpCantHappen)); } return current.value; } } public bool MoveNext() { if (version != list.version) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumFailedVersion)); } if (start) { current = list.head; start = false; } else if(current != null) { current = current.next; } return (current != null); } public void Reset() { if (version != list.version) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumFailedVersion)); } start = true; current = null; } } private class NodeKeyValueCollection : ICollection { ListDictionary list; bool isKeys; public NodeKeyValueCollection(ListDictionary list, bool isKeys) { this.list = list; this.isKeys = isKeys; } void ICollection.CopyTo(Array array, int index) { if (array==null) throw new ArgumentNullException("array"); if (index < 0) throw new ArgumentOutOfRangeException("index", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNum)); for (DictionaryNode node = list.head; node != null; node = node.next) { array.SetValue(isKeys ? node.key : node.value, index); index++; } } int ICollection.Count { get { int count = 0; for (DictionaryNode node = list.head; node != null; node = node.next) { count++; } return count; } } bool ICollection.IsSynchronized { get { return false; } } object ICollection.SyncRoot { get { return list.SyncRoot; } } IEnumerator IEnumerable.GetEnumerator() { return new NodeKeyValueEnumerator(list, isKeys); } private class NodeKeyValueEnumerator: IEnumerator { ListDictionary list; DictionaryNode current; int version; bool isKeys; bool start; public NodeKeyValueEnumerator(ListDictionary list, bool isKeys) { this.list = list; this.isKeys = isKeys; this.version = list.version; this.start = true; this.current = null; } public object Current { get { if (current == null) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumOpCantHappen)); } return isKeys ? current.key : current.value; } } public bool MoveNext() { if (version != list.version) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumFailedVersion)); } if (start) { current = list.head; start = false; } else { current = current.next; } return (current != null); } public void Reset() { if (version != list.version) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumFailedVersion)); } start = true; current = null; } } } [Serializable] private class DictionaryNode { public object key; public object value; public DictionaryNode next; } } }[To be supplied.] ///
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