BooleanExpr.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 / BooleanExpr.cs / 1 / BooleanExpr.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace MS.Internal.Xml.XPath { 
    using System;
    using System.Xml; 
    using System.Xml.XPath;
    using System.Xml.Xsl;
    using System.Diagnostics;
    using System.Globalization; 

    internal sealed class BooleanExpr : ValueQuery { 
        private Query opnd1; 
        private Query opnd2;
        private bool isOr; 

        public BooleanExpr(Operator.Op op, Query opnd1, Query opnd2) {
            Debug.Assert(op == Operator.Op.AND || op == Operator.Op.OR);
            Debug.Assert(opnd1 != null && opnd2 != null); 
            if (opnd1.StaticType != XPathResultType.Boolean) {
                opnd1 = new BooleanFunctions(Function.FunctionType.FuncBoolean, opnd1); 
            } 
            if (opnd2.StaticType != XPathResultType.Boolean) {
                opnd2 = new BooleanFunctions(Function.FunctionType.FuncBoolean, opnd2); 
            }
            this.opnd1 = opnd1;
            this.opnd2 = opnd2;
            isOr = (op == Operator.Op.OR); 
        }
        private BooleanExpr(BooleanExpr other) : base(other) { 
            this.opnd1 = Clone(other.opnd1); 
            this.opnd2 = Clone(other.opnd2);
            this.isOr  = other.isOr; 
        }

        public override void SetXsltContext(XsltContext context){
            opnd1.SetXsltContext(context); 
            opnd2.SetXsltContext(context);
        } 
 
        public override object Evaluate(XPathNodeIterator nodeIterator) {
            object n1 = opnd1.Evaluate(nodeIterator); 
            if (((bool) n1) == isOr) {
                return n1;
            }
            return opnd2.Evaluate(nodeIterator); 
        }
 
        public override XPathNodeIterator Clone() { return new BooleanExpr(this); } 
        public override XPathResultType StaticType { get { return XPathResultType.Boolean; } }
 
        public override void PrintQuery(XmlWriter w) {
            w.WriteStartElement(this.GetType().Name);
            w.WriteAttributeString("op", (isOr ? Operator.Op.OR : Operator.Op.AND).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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