Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / baseaxisquery.cs / 1 / baseaxisquery.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.Xml.Xsl; using System.Collections; internal abstract class BaseAxisQuery : Query { internal Query qyInput; bool nameTest; string name; string prefix; string nsUri; XPathNodeType typeTest; // these two things are the state of this class // that need to be reset whenever the context changes. protected XPathNavigator currentNode; protected int position; protected BaseAxisQuery(Query qyInput) { this.name = string.Empty; this.prefix = string.Empty; this.nsUri = string.Empty; this.qyInput = qyInput; } protected BaseAxisQuery(Query qyInput, string name, string prefix, XPathNodeType typeTest) { Debug.Assert(qyInput != null); this.qyInput = qyInput; this.name = name; this.prefix = prefix; this.typeTest = typeTest; this.nameTest = prefix.Length != 0 || name.Length != 0; this.nsUri = string.Empty; } protected BaseAxisQuery(BaseAxisQuery other) : base(other) { this.qyInput = Clone(other.qyInput); this.name = other.name; this.prefix = other.prefix; this.nsUri = other.nsUri; this.typeTest = other.typeTest; this.nameTest = other.nameTest; this.position = other.position; this.currentNode = other.currentNode; } public override void Reset() { position = 0; currentNode = null; // After this current will not point to context node from Evaluate() call // But this is ok, becuase there is no public Reset() on XPathNodeIterator qyInput.Reset(); } public override void SetXsltContext(XsltContext context) { Debug.Assert(context != null); nsUri = context.LookupNamespace(prefix); qyInput.SetXsltContext(context); } protected string Name { get { return name; } } protected string Prefix { get { return prefix; } } protected string Namespace { get { return nsUri; } } protected bool NameTest { get { return nameTest; } } protected XPathNodeType TypeTest { get { return typeTest; } } public override int CurrentPosition { get { return position; } } public override XPathNavigator Current { get { return currentNode; } } public virtual bool matches(XPathNavigator e) { if ( TypeTest == e.NodeType || TypeTest == XPathNodeType.All || TypeTest == XPathNodeType.Text && (e.NodeType == XPathNodeType.Whitespace || e.NodeType == XPathNodeType.SignificantWhitespace) ) { if (NameTest) { if (name.Equals(e.LocalName) || name.Length == 0) { if (nsUri.Equals(e.NamespaceURI)){ return true; } } } else { return true; } } return false; } public override object Evaluate(XPathNodeIterator nodeIterator) { ResetCount(); Reset(); qyInput.Evaluate(nodeIterator); AssertQuery(qyInput); return this; } public override double XsltDefaultPriority { get { if (qyInput.GetType() != typeof(ContextQuery)) { return 0.5; // a/b a[b] id('s')/a } Debug.Assert(this is AttributeQuery || this is ChildrenQuery); if (name.Length != 0) { return 0; // p:foo, foo, processing-instruction("foo") } if (prefix.Length != 0) { return -0.25; // p:* } return -0.5; // *, text(), node() } } public override XPathResultType StaticType { get { return XPathResultType.NodeSet; } } public override void PrintQuery(XmlWriter w) { w.WriteStartElement(this.GetType().Name); if (NameTest) { w.WriteAttributeString("name", Prefix.Length != 0 ? Prefix + ':' + Name : Name); } if (TypeTest != XPathNodeType.Element) { w.WriteAttributeString("nodeType", TypeTest.ToString()); } qyInput.PrintQuery(w); w.WriteEndElement(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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