NodeFunctions.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / XPath / Internal / NodeFunctions.cs / 1305376 / NodeFunctions.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 FT = MS.Internal.Xml.XPath.Function.FunctionType;
 
    internal sealed class NodeFunctions : ValueQuery { 
        Query arg = null;
        FT funcType; 
        XsltContext xsltContext;

        public NodeFunctions(FT funcType, Query arg) {
            this.funcType = funcType; 
            this.arg = arg;
        } 
 
        public override void SetXsltContext(XsltContext context){
            this.xsltContext = context.Whitespace ? context : null; 
            if (arg != null) {
                arg.SetXsltContext(context);
            }
        } 

        private XPathNavigator EvaluateArg(XPathNodeIterator context) { 
            if (arg == null) { 
                return context.Current;
            } 
            arg.Evaluate(context);
            return arg.Advance();
        }
 
        public override object Evaluate(XPathNodeIterator context)  {
            XPathNavigator argVal; 
 
            switch (funcType) {
            case FT.FuncPosition: 
                return (double)context.CurrentPosition;
            case FT.FuncLast:
                return (double)context.Count;
            case FT.FuncNameSpaceUri: 
                argVal = EvaluateArg(context);
                if (argVal != null) { 
                    return argVal.NamespaceURI; 
                }
                break; 
            case FT.FuncLocalName:
                argVal = EvaluateArg(context);
                if (argVal != null) {
                    return argVal.LocalName; 
                }
                break; 
            case FT.FuncName : 
                argVal = EvaluateArg(context);
                if (argVal != null) { 
                    return argVal.Name;
                }
                break;
            case FT.FuncCount: 
                arg.Evaluate(context);
                int count = 0; 
                if (xsltContext != null) { 
                    XPathNavigator nav;
                    while ((nav = arg.Advance()) != null) { 
                        if (nav.NodeType != XPathNodeType.Whitespace || xsltContext.PreserveWhitespace(nav)) {
                            count++;
                        }
                    } 
                } else {
                    while (arg.Advance() != null) { 
                        count++; 
                    }
                } 
                return (double) count;
            }
            return string.Empty;
        } 

        public override XPathResultType StaticType { get { return Function.ReturnTypes[(int)funcType]; } } 
 
        public override XPathNodeIterator Clone() {
            NodeFunctions method = new NodeFunctions(funcType, Clone(arg)); 
            method.xsltContext = this.xsltContext;
            return method;
       }
 
        public override void PrintQuery(XmlWriter w) {
            w.WriteStartElement(this.GetType().Name); 
            w.WriteAttributeString("name", funcType.ToString()); 
            if (arg != null) {
                arg.PrintQuery(w); 
            }
            w.WriteEndElement();
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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