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//------------------------------------------------------------------------------
// <copyright file="DoubleLink.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* DoubleLink
*
* Copyright (c) 1998-1999, Microsoft Corporation
*
*/
namespace System.Web.Util {
using System.Runtime.Serialization.Formatters;
internal class DoubleLink {
internal DoubleLink _next, _prev;
internal Object Item;
internal DoubleLink() {
_next = _prev = this;
}
internal DoubleLink(Object item) : this() {
this.Item = item;
}
internal DoubleLink Next {get {return _next;}}
internal void InsertAfter(DoubleLink after) {
this._prev = after;
this._next = after._next;
after._next = this;
this._next._prev = this;
}
internal void InsertBefore(DoubleLink before) {
this._prev = before._prev;
this._next = before;
before._prev = this;
this._prev._next = this;
}
internal void Remove() {
this._prev._next = this._next;
this._next._prev = this._prev;
_next = _prev = this;
}
#if DBG
internal virtual void DebugValidate() {
Debug.CheckValid(this._next != this || this._prev == this, "Invalid link");
}
internal virtual string DebugDescription(string indent) {
string desc;
desc = indent + "_next=" + _next + ", _prev=" + _prev + "\nItem=";
desc += Debug.GetDescription(Item, indent + " ");
return desc;
}
#endif
}
}
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