NumericExpr.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / NumericExpr.cs / 1 / NumericExpr.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 NumericExpr : ValueQuery { 
        private Operator.Op op; 
        private Query opnd1;
        private Query opnd2; 

        public NumericExpr(Operator.Op op, Query opnd1, Query  opnd2) {
            Debug.Assert(
                op == Operator.Op.PLUS || op == Operator.Op.MINUS || 
                op == Operator.Op.MUL  || op == Operator.Op.DIV ||
                op == Operator.Op.MOD 
            ); 
            Debug.Assert(opnd1 != null && opnd2 != null);
            if (opnd1.StaticType != XPathResultType.Number) { 
                opnd1 = new NumberFunctions(Function.FunctionType.FuncNumber, opnd1);
            }
            if (opnd2.StaticType != XPathResultType.Number) {
                opnd2 = new NumberFunctions(Function.FunctionType.FuncNumber, opnd2); 
            }
            this.op = op; 
            this.opnd1 = opnd1; 
            this.opnd2 = opnd2;
        } 
        private NumericExpr(NumericExpr other) : base(other) {
            this.op    = other.op;
            this.opnd1 = Clone(other.opnd1);
            this.opnd2 = Clone(other.opnd2); 
        }
 
        public override void SetXsltContext(XsltContext context){ 
            opnd1.SetXsltContext(context);
            opnd2.SetXsltContext(context); 
        }

        public override object Evaluate(XPathNodeIterator nodeIterator) {
            return GetValue(this.op, 
                XmlConvert.ToXPathDouble(opnd1.Evaluate(nodeIterator)),
                XmlConvert.ToXPathDouble(opnd2.Evaluate(nodeIterator)) 
            ); 
        }
        private static double GetValue(Operator.Op op, double n1, double n2) { 
            Debug.Assert(op == Operator.Op.PLUS || op == Operator.Op.MINUS || op == Operator.Op.MOD || op == Operator.Op.DIV || op == Operator.Op.MUL);
            switch (op) {
            case Operator.Op.PLUS   : return  n1 + n2;
            case Operator.Op.MINUS  : return  n1 - n2; 
            case Operator.Op.MOD    : return  n1 % n2;
            case Operator.Op.DIV    : return  n1 / n2; 
            case Operator.Op.MUL    : return  n1 * n2; 
            }
            return 0; 
        }

        public override XPathResultType StaticType { get { return XPathResultType.Number; } }
 
        public override XPathNodeIterator Clone() { return new NumericExpr(this); }
 
        public override void PrintQuery(XmlWriter w) { 
            w.WriteStartElement(this.GetType().Name);
            w.WriteAttributeString("op", op.ToString()); 
            opnd1.PrintQuery(w);
            opnd2.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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