DoubleLinkList.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / DoubleLinkList.cs / 1 / DoubleLinkList.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * DoubleLinkList 
 *
 * Copyright (c) 1998-1999, Microsoft Corporation 
 *
 */

namespace System.Web.Util { 
    using System.Text;
    using System.Runtime.Serialization.Formatters; 
 
    internal class DoubleLinkList : DoubleLink {
        internal DoubleLinkList() { 
        }

#if UNUSED_CODE
        internal void Clear() { 
            _next = _prev = this;
        } 
#endif 

        internal bool IsEmpty() { 
            return _next == this;
        }

#if UNUSED_CODE 
        internal DoubleLink GetHead() {
            return _next; 
        } 
#endif
 
#if UNUSED_CODE
        internal DoubleLink GetTail() {
            return _prev;
        } 
#endif
 
#if UNUSED_CODE 
        internal Object RemoveHead() {
            _next.Remove(); return _next.Item; 
        }
#endif

#if UNUSED_CODE 
        internal Object RemoveTail() {
            _prev.Remove(); return _prev.Item; 
        } 
#endif
        internal virtual void InsertHead(DoubleLink entry) { 
            entry.InsertAfter(this);
        }
        internal virtual void InsertTail(DoubleLink entry) {
            entry.InsertBefore(this); 
        }
 
#if UNUSED_CODE 
        internal DoubleLinkList RemoveSublist(DoubleLink head, DoubleLink tail) {
            DoubleLinkList  list = new DoubleLinkList(); 

            head._prev._next = tail._next;
            tail._next._prev = head._prev;
            list._next = head; 
            list._prev = tail;
            head._prev = list; 
            tail._next = list; 

            return list; 
        }
#endif

        internal DoubleLinkListEnumerator GetEnumerator() { 
            return new DoubleLinkListEnumerator(this);
        } 
 
#if DBG
        internal override void DebugValidate() { 
            DoubleLink  l1, l2;

            base.DebugValidate();
 
            /*
             * Detect loops by moving one pointer forward 2 for every 1 
             * of the other. 
             */
 
            l1 = l2 = this;
            for (;;) {
                /* move l2 forward */
                l2 = l2._next; 
                if (l2 == this)
                    break; 
 
                Debug.CheckValid(l2 != l1, "Invalid loop in list, first move.");
                l2.DebugValidate(); 

                /* move l2 forward again */
                l2 = l2._next;
                if (l2 == this) 
                    break;
 
                Debug.CheckValid(l2 != l1, "Invalid loop in list, second move."); 
                l2.DebugValidate();
 
                /* move l1 forward */
                l1 = l1._next;
            }
        } 

        internal override string DebugDescription(String indent) { 
            string                      desc; 
            DoubleLinkListEnumerator    lenum;
            int                         c; 
            StringBuilder               sb;
            string                      i2 = indent + "    ";

            if (IsEmpty()) { 
                desc = indent + "DoubleLinkList is empty\n";
            } 
            else { 
                c = Length;
 
                sb = new StringBuilder(indent + "DoubleLinkList has " + c + " entries.\n");
                lenum = GetEnumerator();
                while (lenum.MoveNext()) {
                    sb.Append(Debug.GetDescription(lenum.GetDoubleLink(), i2)); 
                }
 
                desc = sb.ToString(); 
            }
 
            return desc;
        }
#endif
 
        internal int Length {
            get { 
                DoubleLinkListEnumerator    lenum; 
                int                         c;
 
                Debug.Validate(this);

                c = 0;
                lenum = GetEnumerator(); 
                while (lenum.MoveNext()) {
                    c++; 
                } 

                return c; 
            }
        }
    }
}

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