Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / Query.cs / 2 / Query.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace MS.Internal.Xml.XPath { using System; using System.Xml; using System.Xml.XPath; using System.Xml.Xsl; using System.Diagnostics; using System.Collections.Generic; // See comments to QueryBuilder.Props // Not all of them are used currently internal enum QueryProps { None = 0x00, Position = 0x01, Count = 0x02, Cached = 0x04, Reverse = 0x08, Merge = 0x10, }; // Turn off DebuggerDisplayAttribute. in subclasses of Query. // Calls to Current in the XPathNavigator.DebuggerDisplayProxy may change state or throw [DebuggerDisplay("{ToString()}")] internal abstract class Query : ResetableIterator { public Query() { } protected Query(Query other) : base(other) { } // -- XPathNodeIterator -- //public abstract XPathNodeIterator Clone(); //public abstract XPathNavigator Current { get; } //public abstract int CurrentPosition { get; } public override bool MoveNext() { return Advance() != null; } public override int Count { get { // Query can be ordered in reverse order. So we can't assume like base.Count that last node has greatest position. if (count == -1) { Query clone = (Query)this.Clone(); clone.Reset(); count = 0; while (clone.MoveNext()) count ++; } return count; } } // ------------- ResetableIterator ----------- // It's importent that Query is resetable. This fact is used in several plases: // 1. In LogicalExpr: "foo = bar" // 2. In SelectionOperator.Reset(). // In all this cases Reset() means restart iterate through the same nodes. // So reset shouldn't clean bufferes in query. This should be done in set context. //public abstract void Reset(); // -------------------- Query ------------------ public virtual void SetXsltContext(XsltContext context) { } public abstract object Evaluate(XPathNodeIterator nodeIterator); public abstract XPathNavigator Advance(); public virtual XPathNavigator MatchNode(XPathNavigator current) { throw XPathException.Create(Res.Xp_InvalidPattern); } public virtual double XsltDefaultPriority { get { return 0.5; } } public abstract XPathResultType StaticType { get; } public virtual QueryProps Properties { get { return QueryProps.Merge; } } // ----------------- Helper methods ------------- public static Query Clone(Query input) { if (input != null) { return (Query)input.Clone(); } return null; } protected static XPathNodeIterator Clone(XPathNodeIterator input) { if (input != null) { return input.Clone(); } return null; } protected static XPathNavigator Clone(XPathNavigator input) { if (input != null) { return input.Clone(); } return null; } // ----------------------------------------------------- // Set of methods to support insertion to sorted buffer. // buffer is always sorted here public bool Insert(Listbuffer, XPathNavigator nav) { int l = 0; int r = buffer.Count; // In most cases nodes are already sorted. // This means that nav often will be equal or after then last item in the buffer // So let's check this first. if (r != 0) { switch (CompareNodes(buffer[r - 1], nav)) { case XmlNodeOrder.Same: return false; case XmlNodeOrder.Before: buffer.Add(nav.Clone()); return true; default: r --; break; } } while (l < r) { int m = GetMedian(l, r); switch (CompareNodes(buffer[m], nav)) { case XmlNodeOrder.Same: return false; case XmlNodeOrder.Before: l = m + 1; break; default: r = m; break; } } AssertDOD(buffer, nav, l); buffer.Insert(l, nav.Clone()); return true; } private static int GetMedian(int l, int r) { Debug.Assert(0 <= l && l < r); return (int) (((uint) l + (uint) r) >> 1); } public static XmlNodeOrder CompareNodes(XPathNavigator l, XPathNavigator r) { XmlNodeOrder cmp = l.ComparePosition(r); if (cmp == XmlNodeOrder.Unknown) { XPathNavigator copy = l.Clone(); copy.MoveToRoot(); string baseUriL = copy.BaseURI; if (! copy.MoveTo(r)) { copy = r.Clone(); } copy.MoveToRoot(); string baseUriR = copy.BaseURI; int cmpBase = string.CompareOrdinal(baseUriL, baseUriR); cmp = ( cmpBase < 0 ? XmlNodeOrder.Before : cmpBase > 0 ? XmlNodeOrder.After : /*default*/ XmlNodeOrder.Unknown ); } return cmp; } [Conditional("DEBUG")] private void AssertDOD(List buffer, XPathNavigator nav, int pos) { if (nav.GetType().ToString() == "Microsoft.VisualStudio.Modeling.StoreNavigator") return; if (nav.GetType().ToString() == "System.Xml.DataDocumentXPathNavigator") return; Debug.Assert(0 <= pos && pos <= buffer.Count, "Algorithm error: Insert()"); XmlNodeOrder cmp; if (0 < pos) { cmp = CompareNodes(buffer[pos - 1], nav); Debug.Assert(cmp == XmlNodeOrder.Before, "Algorithm error: Insert()"); } if (pos < buffer.Count) { cmp = CompareNodes(nav, buffer[pos]); Debug.Assert(cmp == XmlNodeOrder.Before, "Algorithm error: Insert()"); } } [Conditional("DEBUG")] public static void AssertQuery(Query query) { Debug.Assert(query != null, "AssertQuery(): query == null"); if (query is FunctionQuery) return; // Temp Fix. Functions (as document()) return now unordered sequences query = Clone(query); XPathNavigator last = null; XPathNavigator curr; int querySize = query.Clone().Count; int actualSize = 0; while ((curr = query.Advance()) != null) { if (curr.GetType().ToString() == "Microsoft.VisualStudio.Modeling.StoreNavigator") return; if (curr.GetType().ToString() == "System.Xml.DataDocumentXPathNavigator") return; Debug.Assert(curr == query.Current, "AssertQuery(): query.Advance() != query.Current"); if (last != null) { if (last.NodeType == XPathNodeType.Namespace && curr.NodeType == XPathNodeType.Namespace) { // NamespaceQuery reports namsespaces in mixed order. // Ignore this for now. // It seams that this doesn't breake other queries becasue NS can't have children } else { XmlNodeOrder cmp = CompareNodes(last, curr); Debug.Assert(cmp == XmlNodeOrder.Before, "AssertQuery(): Wrong node order"); } } last = curr.Clone(); actualSize++; } Debug.Assert(actualSize == querySize, "AssertQuery(): actualSize != querySize"); } // =================== XPathResultType_Navigator ====================== // In v.1.0 and v.1.1 XPathResultType.Navigator is defined == to XPathResultType.String // This is source for multiple bugs or additional type casts. // To fix all of them in one change in v.2 we internaly use one more value: public const XPathResultType XPathResultType_Navigator = (XPathResultType) 4; // The biggest challenge in this change is preserve backward compatibility with v.1.1 // To achive this in all places where we accept from or report to user XPathResultType. // On my best knowledge this happens only in XsltContext.ResolveFunction() / IXsltContextFunction.ReturnType protected XPathResultType GetXPathType(object value) { if (value is XPathNodeIterator) return XPathResultType.NodeSet; if (value is string ) return XPathResultType.String; if (value is double ) return XPathResultType.Number; if (value is bool ) return XPathResultType.Boolean; Debug.Assert(value is XPathNavigator, "Unknown value type"); return XPathResultType_Navigator; } // =================== Serialization ====================== public virtual void PrintQuery(XmlWriter w) { w.WriteElementString(this.GetType().Name, string.Empty); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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