VariableQuery.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / VariableQuery.cs / 1 / VariableQuery.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; 

    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(); 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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