NumberFunctions.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 / NumberFunctions.cs / 1 / NumberFunctions.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.Text;
    using FT = MS.Internal.Xml.XPath.Function.FunctionType; 
 
    internal sealed class NumberFunctions : ValueQuery {
        private Query arg = null; 
        private FT ftype;

        public NumberFunctions(FT ftype, Query arg) {
            this.arg = arg; 
            this.ftype = ftype;
        } 
        private NumberFunctions(NumberFunctions other) : base(other) { 
            this.arg = Clone(other.arg);
            this.ftype = other.ftype; 
        }

        public override void SetXsltContext(XsltContext context) {
            if (arg != null) { 
                arg.SetXsltContext(context);
            } 
        } 

        internal static double Number(bool arg) { 
            return arg ? 1.0 : 0.0;
        }
        internal static double Number(string arg) {
            return XmlConvert.ToXPathDouble(arg); 
        }
 
        public override object Evaluate(XPathNodeIterator nodeIterator) { 
            switch (ftype) {
            case FT.FuncNumber  : return Number (nodeIterator); 
            case FT.FuncSum     : return Sum    (nodeIterator);
            case FT.FuncFloor   : return Floor  (nodeIterator);
            case FT.FuncCeiling : return Ceiling(nodeIterator);
            case FT.FuncRound   : return Round  (nodeIterator); 
            }
            return null; 
        } 

        private double Number(XPathNodeIterator nodeIterator) { 
            if (arg == null) {
                return XmlConvert.ToXPathDouble(nodeIterator.Current.Value);
            }
            object argVal = arg.Evaluate(nodeIterator); 
            switch (GetXPathType(argVal)) {
            case XPathResultType.NodeSet : 
                XPathNavigator value = arg.Advance(); 
                if (value != null) {
                    return Number(value.Value); 
                }
                break;
            case XPathResultType.String :
                return Number((string)argVal); 
            case XPathResultType.Boolean :
                return Number((bool) argVal); 
            case XPathResultType.Number: 
                return (double) argVal;
            case XPathResultType_Navigator: 
                return Number(((XPathNavigator)argVal).Value);
            }
            return double.NaN;
        } 

        private double Sum(XPathNodeIterator nodeIterator) { 
            double sum = 0; 
            arg.Evaluate(nodeIterator);
            XPathNavigator nav; 
            while ((nav = arg.Advance()) != null) {
                sum += Number(nav.Value);
            }
            return sum; 
        }
 
        private double Floor(XPathNodeIterator nodeIterator) { 
            return Math.Floor((double) arg.Evaluate(nodeIterator));
        } 

        private double Ceiling(XPathNodeIterator nodeIterator) {
            return Math.Ceiling((double) arg.Evaluate(nodeIterator));
        } 

        private double Round(XPathNodeIterator nodeIterator) { 
            double n = XmlConvert.ToXPathDouble(arg.Evaluate(nodeIterator)); 
            return XmlConvert.XPathRound(n);
        } 

        public override XPathResultType StaticType { get { return XPathResultType.Number; } }

        public override XPathNodeIterator Clone() { return new NumberFunctions(this); } 

        public override void PrintQuery(XmlWriter w) { 
            w.WriteStartElement(this.GetType().Name); 
            w.WriteAttributeString("name", ftype.ToString());
            if (arg != null) { 
                arg.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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