Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / DescendantOverDescendantQuery.cs / 1 / DescendantOverDescendantQuery.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; // DescendantOverDescendantQuery: for each input it looks for the topmost descendents that matches to ns:name // This is posible when query which has this query as its input (child query) is descendent as well. // Work of this query doesn't depend on DOD of its input. // It doesn't garate DOD of the output even when input is DOD. internal sealed class DescendantOverDescendantQuery : DescendantBaseQuery { private int level = 0; public DescendantOverDescendantQuery(Query qyParent, bool matchSelf, string name, string prefix, XPathNodeType typeTest, bool abbrAxis) : base(qyParent, name, prefix, typeTest, matchSelf, abbrAxis) {} private DescendantOverDescendantQuery(DescendantOverDescendantQuery other) : base(other) { this.level = other.level; } public override void Reset() { level = 0; base.Reset(); } public override XPathNavigator Advance() { while (true) { if (level == 0) { currentNode = qyInput.Advance(); position = 0; if (currentNode == null) { return null; } if (matchSelf && matches(currentNode)) { position = 1; return currentNode; } currentNode = currentNode.Clone(); if (! MoveToFirstChild()) { continue; } } else { if (!MoveUpUntillNext()) { continue; } } do { if (matches(currentNode)) { position++; return currentNode; } } while (MoveToFirstChild()); } } private bool MoveToFirstChild() { if (currentNode.MoveToFirstChild()) { level++; return true; } return false; } private bool MoveUpUntillNext() { // move up untill we can move next while (! currentNode.MoveToNext()) { -- level; if (level == 0) { return false; } bool result = currentNode.MoveToParent(); Debug.Assert(result, "Algorithm error, We always should be able to move up if level > 0"); } return true; } public override XPathNodeIterator Clone() { return new DescendantOverDescendantQuery(this); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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