Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Collections / Generic / LinkedList.cs / 1 / LinkedList.cs
namespace System.Collections.Generic { using System; using System.Diagnostics; using System.Runtime.Serialization; using System.Security.Permissions; [Serializable()] [System.Runtime.InteropServices.ComVisible(false)] [DebuggerTypeProxy(typeof(System_CollectionDebugView<>))] [DebuggerDisplay("Count = {Count}")] public class LinkedList: ICollection , System.Collections.ICollection, ISerializable, IDeserializationCallback { // This LinkedList is a doubly-Linked circular list. internal LinkedListNode head; internal int count; internal int version; private Object _syncRoot; private SerializationInfo siInfo; //A temporary variable which we need during deserialization. // names for serialization const String VersionName = "Version"; const String CountName = "Count"; const String ValuesName = "Data"; public LinkedList() { } public LinkedList(IEnumerable collection) { if (collection==null) { throw new ArgumentNullException("collection"); } foreach( T item in collection) { AddLast(item); } } protected LinkedList(SerializationInfo info, StreamingContext context) { siInfo = info; } public int Count { get { return count;} } public LinkedListNode First { get { return head;} } public LinkedListNode Last { get { return head == null? null: head.prev;} } bool ICollection .IsReadOnly { get { return false; } } void ICollection .Add(T value) { AddLast(value); } public LinkedListNode AddAfter(LinkedListNode node, T value) { ValidateNode(node); LinkedListNode result = new LinkedListNode (node.list, value); InternalInsertNodeBefore(node.next, result); return result; } public void AddAfter(LinkedListNode node, LinkedListNode newNode) { ValidateNode(node); ValidateNewNode(newNode); InternalInsertNodeBefore(node.next, newNode); newNode.list = this; } public LinkedListNode AddBefore(LinkedListNode node, T value) { ValidateNode(node); LinkedListNode result = new LinkedListNode (node.list, value); InternalInsertNodeBefore(node, result); if ( node == head) { head = result; } return result; } public void AddBefore(LinkedListNode node, LinkedListNode newNode) { ValidateNode(node); ValidateNewNode(newNode); InternalInsertNodeBefore(node, newNode); newNode.list = this; if ( node == head) { head = newNode; } } public LinkedListNode AddFirst(T value) { LinkedListNode result = new LinkedListNode (this, value); if (head == null) { InternalInsertNodeToEmptyList(result); } else { InternalInsertNodeBefore( head, result); head = result; } return result; } public void AddFirst(LinkedListNode node) { ValidateNewNode(node); if (head == null) { InternalInsertNodeToEmptyList(node); } else { InternalInsertNodeBefore( head, node); head = node; } node.list = this; } public LinkedListNode AddLast(T value) { LinkedListNode result = new LinkedListNode (this, value); if (head== null) { InternalInsertNodeToEmptyList(result); } else { InternalInsertNodeBefore( head, result); } return result; } public void AddLast(LinkedListNode node) { ValidateNewNode(node); if (head == null) { InternalInsertNodeToEmptyList(node); } else { InternalInsertNodeBefore( head, node); } node.list = this; } public void Clear() { LinkedListNode current = head; while (current != null ) { LinkedListNode temp = current; current = current.Next; // use Next the instead of "next", otherwise it will loop forever temp.Invalidate(); } head = null; count = 0; version++; } public bool Contains(T value) { return Find(value) != null; } public void CopyTo( T[] array, int index) { if (array == null) { throw new ArgumentNullException("array"); } if(index < 0 || index > array.Length) { throw new ArgumentOutOfRangeException("index",SR.GetString(SR.IndexOutOfRange, index) ); } if (array.Length - index < Count) { throw new ArgumentException(SR.GetString(SR.Arg_InsufficientSpace)); } LinkedListNode node = head; if (node != null) { do { array[index++] = node.item; node = node.next; } while (node != head); } } public LinkedListNode Find(T value) { LinkedListNode node = head; EqualityComparer c = EqualityComparer .Default; if (node != null) { if (value != null) { do { if (c.Equals(node.item, value)) { return node; } node = node.next; } while (node != head); } else { do { if (node.item == null) { return node; } node = node.next; } while (node != head); } } return null; } public LinkedListNode FindLast(T value) { if ( head == null) return null; LinkedListNode last = head.prev; LinkedListNode node = last; EqualityComparer c = EqualityComparer .Default; if (node != null) { if (value != null) { do { if (c.Equals(node.item, value)) { return node; } node = node.prev; } while (node != last); } else { do { if (node.item == null) { return node; } node = node.prev; } while (node != last); } } return null; } public Enumerator GetEnumerator() { return new Enumerator(this); } IEnumerator IEnumerable .GetEnumerator() { return GetEnumerator(); } public bool Remove(T value) { LinkedListNode node = Find(value); if (node != null) { InternalRemoveNode(node); return true; } return false; } public void Remove(LinkedListNode node) { ValidateNode(node); InternalRemoveNode(node); } public void RemoveFirst() { if ( head == null) { throw new InvalidOperationException(SR.GetString(SR.LinkedListEmpty)); } InternalRemoveNode(head); } public void RemoveLast() { if ( head == null) { throw new InvalidOperationException(SR.GetString(SR.LinkedListEmpty)); } InternalRemoveNode(head.prev); } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] public virtual void GetObjectData(SerializationInfo info, StreamingContext context) { // Customized serialization for LinkedList. // We need to do this because it will be too expensive to Serialize each node. // This will give us the flexiblility to change internal implementation freely in future. if (info==null) { throw new ArgumentNullException("info"); } info.AddValue(VersionName, version); info.AddValue(CountName, count); //This is the length of the bucket array. if ( count != 0) { T[] array = new T[Count]; CopyTo(array, 0); info.AddValue(ValuesName, array, typeof(T[])); } } public virtual void OnDeserialization(Object sender) { if (siInfo==null) { return; //Somebody had a dependency on this Dictionary and fixed us up before the ObjectManager got to it. } int realVersion = siInfo.GetInt32(VersionName); int count = siInfo.GetInt32(CountName); if ( count != 0) { T[] array = (T[]) siInfo.GetValue(ValuesName, typeof(T[])); if (array==null) { throw new SerializationException(SR.GetString(SR.Serialization_MissingValues)); } for ( int i = 0; i < array.Length; i++) { AddLast(array[i]); } } else { head = null; } version = realVersion; siInfo=null; } private void InternalInsertNodeBefore(LinkedListNode node, LinkedListNode newNode) { newNode.next = node; newNode.prev = node.prev; node.prev.next = newNode; node.prev = newNode; version++; count++; } private void InternalInsertNodeToEmptyList(LinkedListNode newNode) { Debug.Assert( head == null && count == 0, "LinkedList must be empty when this method is called!"); newNode.next = newNode; newNode.prev = newNode; head = newNode; version++; count++; } internal void InternalRemoveNode(LinkedListNode node) { Debug.Assert( node.list == this, "Deleting the node from another list!"); Debug.Assert( head != null, "This method shouldn't be called on empty list!"); if ( node.next == node) { Debug.Assert(count == 1 && head == node, "this should only be true for a list with only one node"); head = null; } else { node.next.prev = node.prev; node.prev.next = node.next; if ( head == node) { head = node.next; } } node.Invalidate(); count--; version++; } internal void ValidateNewNode(LinkedListNode node) { if (node == null) { throw new ArgumentNullException("node"); } if ( node.list != null) { throw new InvalidOperationException(SR.GetString(SR.LinkedListNodeIsAttached)); } } internal void ValidateNode(LinkedListNode node) { if (node == null) { throw new ArgumentNullException("node"); } if ( node.list != this) { throw new InvalidOperationException(SR.GetString(SR.ExternalLinkedListNode)); } } bool System.Collections.ICollection.IsSynchronized { get { return false;} } object System.Collections.ICollection.SyncRoot { get { if( _syncRoot == null) { System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null); } return _syncRoot; } } void System.Collections.ICollection.CopyTo(Array array, int index) { if (array == null) { throw new ArgumentNullException("array"); } if (array.Rank != 1) { throw new ArgumentException(SR.GetString(SR.Arg_MultiRank)); } if( array.GetLowerBound(0) != 0 ) { throw new ArgumentException(SR.GetString(SR.Arg_NonZeroLowerBound)); } if (index < 0) { throw new ArgumentOutOfRangeException("index",SR.GetString(SR.IndexOutOfRange, index) ); } if (array.Length - index < Count) { throw new ArgumentException(SR.GetString(SR.Arg_InsufficientSpace)); } T[] tArray = array as T[]; if (tArray != null) { CopyTo(tArray, index); } else { // // Catch the obvious case assignment will fail. // We can found all possible problems by doing the check though. // For example, if the element type of the Array is derived from T, // we can't figure out if we can successfully copy the element beforehand. // Type targetType = array.GetType().GetElementType(); Type sourceType = typeof(T); if(!(targetType.IsAssignableFrom(sourceType) || sourceType.IsAssignableFrom(targetType))) { throw new ArgumentException(SR.GetString(SR.Invalid_Array_Type)); } object[] objects = array as object[]; if (objects == null) { throw new ArgumentException(SR.GetString(SR.Invalid_Array_Type)); } LinkedListNode node = head; try { if (node != null) { do { objects[index++] = node.item; node = node.next; } while (node != head); } } catch(ArrayTypeMismatchException) { throw new ArgumentException(SR.GetString(SR.Invalid_Array_Type)); } } } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return GetEnumerator(); } [Serializable()] public struct Enumerator : IEnumerator , System.Collections.IEnumerator, ISerializable, IDeserializationCallback { private LinkedList list; private LinkedListNode node; private int version; private T current; private int index; private SerializationInfo siInfo; //A temporary variable which we need during deserialization. const string LinkedListName = "LinkedList"; const string CurrentValueName = "Current"; const string VersionName = "Version"; const string IndexName = "Index"; internal Enumerator(LinkedList list) { this.list = list; version = list.version; node = list.head; current = default(T); index = 0; siInfo = null; } internal Enumerator(SerializationInfo info, StreamingContext context) { siInfo = info; list = null; version = 0; node = null; current = default(T); index = 0; } public T Current { get { return current;} } object System.Collections.IEnumerator.Current { get { if( index == 0 || (index == list.Count + 1)) { ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumOpCantHappen); } return current; } } public bool MoveNext() { if (version != list.version) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumFailedVersion)); } if (node == null) { index = list.Count + 1; return false; } ++index; current = node.item; node = node.next; if (node == list.head) { node = null; } return true; } void System.Collections.IEnumerator.Reset() { if (version != list.version) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_EnumFailedVersion)); } current = default(T); node = list.head; index = 0; } public void Dispose() { } void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { if (info==null) { throw new ArgumentNullException("info"); } info.AddValue(LinkedListName, list); info.AddValue(VersionName, version); info.AddValue(CurrentValueName, current); info.AddValue(IndexName, index); } void IDeserializationCallback.OnDeserialization(Object sender) { if (list != null) { return; //Somebody had a dependency on this Dictionary and fixed us up before the ObjectManager got to it. } if (siInfo==null) { throw new SerializationException(SR.GetString(SR.Serialization_InvalidOnDeser)); } list = (LinkedList )siInfo.GetValue(LinkedListName, typeof(LinkedList )); version = siInfo.GetInt32(VersionName); current = (T)siInfo.GetValue(CurrentValueName, typeof(T)); index = siInfo.GetInt32(IndexName); if( list.siInfo != null) { list.OnDeserialization(sender); } if( index == list.Count + 1) { // end of enumeration node = null; } else { node = list.First; // We don't care if we can point to the correct node if the LinkedList was changed // MoveNext will throw upon next call and Current has the correct value. if( node != null && index != 0) { for(int i =0; i< index; i++) { node = node.next; } if( node == list.First) { node = null; } } } siInfo=null; } } } // Note following class is not serializable since we customized the serialization of LinkedList. [System.Runtime.InteropServices.ComVisible(false)] public sealed class LinkedListNode { internal LinkedList list; internal LinkedListNode next; internal LinkedListNode prev; internal T item; public LinkedListNode( T value) { this.item = value; } internal LinkedListNode(LinkedList list, T value) { this.list = list; this.item = value; } public LinkedList List { get { return list;} } public LinkedListNode Next { get { return next == null || next == list.head? null: next;} } public LinkedListNode Previous { get { return prev == null || this == list.head? null: prev;} } public T Value { get { return item;} set { item = value;} } internal void Invalidate() { list = null; next = null; prev = null; } } }
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