Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / XPathMultyIterator.cs / 1 / XPathMultyIterator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace MS.Internal.Xml.XPath { using System; using System.Xml; using System.Xml.XPath; using System.Diagnostics; using System.Globalization; using System.Collections; internal class XPathMultyIterator: ResetableIterator { protected ResetableIterator[] arr; protected int firstNotEmpty; protected int position; public XPathMultyIterator(ArrayList inputArray) { // NOTE: We do not clone the passed inputArray supposing that it is not changed outside of this class this.arr = new ResetableIterator[inputArray.Count]; for (int i = 0; i < this.arr.Length; i ++) { this.arr[i] = new XPathArrayIterator((ArrayList) inputArray[i]); } Init(); } private void Init() { for (int i = 0; i < arr.Length; i ++) { Advance(i); } for (int i = arr.Length - 2; firstNotEmpty <= i; ) { if (SiftItem(i)) { i --; } } } // returns false is iterator at pos reached it's end & as a result head of the array may be moved bool Advance(int pos) { if (! arr[pos].MoveNext()) { if (firstNotEmpty != pos) { ResetableIterator empty = arr[pos]; Array.Copy(arr, firstNotEmpty, arr, firstNotEmpty + 1, pos - firstNotEmpty); arr[firstNotEmpty] = empty; } firstNotEmpty ++; return false; } return true; } #if false string dump { get { return Dump(); } } string Dump(ResetableIterator it) { it = (ResetableIterator) it.Clone(); System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append("("); do { XPathNavigator nav = it.Current.Clone(); nav.MoveToAttribute("id1", ""); sb.Append(nav.Value); sb.Append(", "); } while (it.MoveNext()); sb.Length = sb.Length - 2; sb.Append(")"); return sb.ToString(); } string Dump() { System.Text.StringBuilder sb = new System.Text.StringBuilder(); for (int i = 0; i < arr.Length; i ++) { sb.Append(i); sb.Append(": "); if (i < firstNotEmpty) { sb.Append("()"); } else { sb.Append(Dump(arr[i])); } sb.Append("; "); } return sb.ToString(); } #endif // Invariant: a[i] < a[i+1] for i > item // returns flase is head of the list was moved & as a result consistancy of list depends on head consistancy. bool SiftItem(int item) { Debug.Assert(firstNotEmpty <= item && item < arr.Length); ResetableIterator it = arr[item]; while (item + 1 < arr.Length) { XmlNodeOrder order = Query.CompareNodes(it.Current, arr[item + 1].Current); if (order == XmlNodeOrder.Before) { break; } if (order == XmlNodeOrder.After) { arr[item] = arr[item + 1]; //arr[item + 1] = it; item ++; } else { // Same arr[item] = it; if (! Advance(item)) { return false; } it = arr[item]; } } arr[item] = it; return true; } public override void Reset() { firstNotEmpty = 0; position = 0; for (int i = 0; i < arr.Length; i ++) { arr[i].Reset(); } Init(); } public XPathMultyIterator(XPathMultyIterator it) { this.arr = (ResetableIterator[]) it.arr.Clone(); this.firstNotEmpty = it.firstNotEmpty; this.position = it.position; } public override XPathNodeIterator Clone() { return new XPathMultyIterator(this); } public override XPathNavigator Current { get { Debug.Assert(position != 0, "MoveNext() wasn't called"); Debug.Assert(firstNotEmpty < arr.Length, "MoveNext() returned false"); return arr[firstNotEmpty].Current; } } public override int CurrentPosition { get { return position; } } public override bool MoveNext() { // NOTE: MoveNext() may be called even if the previous call to MoveNext() returned false, SQLBUDT 330810 if (firstNotEmpty >= arr.Length) { return false; } if (position != 0) { if (Advance(firstNotEmpty)) { SiftItem(firstNotEmpty); } if (firstNotEmpty >= arr.Length) { return false; } } position ++; return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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