BooleanExpr.cs

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using System.Xml.XPath;
using System.Xml.Xsl;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class BooleanExpr : ValueQuery
{
    private readonly Query _opnd1;
 
    private readonly Query _opnd2;
 
    private readonly bool _isOr;
 
    public override XPathResultType StaticType => XPathResultType.Boolean;
 
    public BooleanExpr(Operator.Op op, Query opnd1, Query opnd2)
    {
        if (opnd1.StaticType != XPathResultType.Boolean)
        {
            opnd1 = new BooleanFunctions(Function.FunctionType.FuncBoolean, opnd1);
        }
        if (opnd2.StaticType != XPathResultType.Boolean)
        {
            opnd2 = new BooleanFunctions(Function.FunctionType.FuncBoolean, opnd2);
        }
        _opnd1 = opnd1;
        _opnd2 = opnd2;
        _isOr = op == Operator.Op.OR;
    }
 
    private BooleanExpr(BooleanExpr other)
        : base(other)
    {
        _opnd1 = Query.Clone(other._opnd1);
        _opnd2 = Query.Clone(other._opnd2);
        _isOr = other._isOr;
    }
 
    public override void SetXsltContext(XsltContext context)
    {
        _opnd1.SetXsltContext(context);
        _opnd2.SetXsltContext(context);
    }
 
    public override object Evaluate(XPathNodeIterator nodeIterator)
    {
        object obj = _opnd1.Evaluate(nodeIterator);
        if ((bool)obj == _isOr)
        {
            return obj;
        }
        return _opnd2.Evaluate(nodeIterator);
    }
 
    public override XPathNodeIterator Clone()
    {
        return new BooleanExpr(this);
    }
}