VariableQuery.cs

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using System;
using System.Xml.XPath;
using System.Xml.Xsl;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class VariableQuery : ExtensionQuery
{
    private IXsltContextVariable _variable;
 
    public override XPathResultType StaticType
    {
        get
        {
            if (_variable != null)
            {
                return GetXPathType(Evaluate(null));
            }
            XPathResultType xPathResultType = ((_variable != null) ? _variable.VariableType : XPathResultType.Any);
            if (xPathResultType == XPathResultType.Error)
            {
                xPathResultType = XPathResultType.Any;
            }
            return xPathResultType;
        }
    }
 
    public VariableQuery(string name, string prefix)
        : base(prefix, name)
    {
    }
 
    private VariableQuery(VariableQuery other)
        : base(other)
    {
        _variable = other._variable;
    }
 
    public override void SetXsltContext(XsltContext context)
    {
        if (context == null)
        {
            throw XPathException.Create(System.SR.Xp_NoContext);
        }
        if (xsltContext != context)
        {
            xsltContext = context;
            _variable = xsltContext.ResolveVariable(prefix, name);
            if (_variable == null)
            {
                throw XPathException.Create(System.SR.Xp_UndefVar, base.QName);
            }
        }
    }
 
    public override object Evaluate(XPathNodeIterator nodeIterator)
    {
        if (xsltContext == null)
        {
            throw XPathException.Create(System.SR.Xp_NoContext);
        }
        return ProcessResult(_variable.Evaluate(xsltContext));
    }
 
    public override XPathNodeIterator Clone()
    {
        return new VariableQuery(this);
    }
}