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//------------------------------------------------------------------------------
// <copyright file="VariableQuery.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
namespace MS.Internal.Xml.XPath {
using System;
using System.Xml;
using System.Xml.XPath;
using System.Diagnostics;
using System.Globalization;
using System.Xml.Xsl;
internal sealed class VariableQuery : ExtensionQuery {
private IXsltContextVariable variable;
public VariableQuery(string name, string prefix) : base(prefix, name) {}
private VariableQuery(VariableQuery other) : base(other) {
this.variable = other.variable;
}
public override void SetXsltContext(XsltContext context) {
if (context == null) {
throw XPathException.Create(Res.Xp_NoContext);
}
if (this.xsltContext != context) {
xsltContext = context;
variable = xsltContext.ResolveVariable(prefix, name);
// Since null is allowed for ResolveFunction, allow it for ResolveVariable as well
if (variable == null) {
throw XPathException.Create(Res.Xp_UndefVar, QName);
}
}
}
public override object Evaluate(XPathNodeIterator nodeIterator) {
if (xsltContext == null) {
throw XPathException.Create(Res.Xp_NoContext);
}
return ProcessResult(variable.Evaluate(xsltContext));
}
public override XPathResultType StaticType { get {
if (variable != null) { // Temp. fix to overcome dependency on static type
return GetXPathType(Evaluate(null));
}
XPathResultType result = variable != null ? variable.VariableType : XPathResultType.Any;
if (result == XPathResultType.Error) {
// In v.1 we confused Error & Any so now for backward compatibility we should allow users to return any of them.
result = XPathResultType.Any;
}
return result;
} }
public override XPathNodeIterator Clone() { return new VariableQuery(this); }
public override void PrintQuery(XmlWriter w) {
w.WriteStartElement(this.GetType().Name);
w.WriteAttributeString("name", prefix.Length != 0 ? prefix + ':' + name : name);
w.WriteEndElement();
}
}
}
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