// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Diagnostics;
using System.Xml.XPath;

namespace MS.Internal.Xml.XPath
{
    internal sealed class AbsoluteQuery : ContextQuery
    {
        public AbsoluteQuery() : base() { }
        private AbsoluteQuery(AbsoluteQuery other) : base(other) { }

        public override object Evaluate(XPathNodeIterator context)
        {
            Debug.Assert(context.Current != null);
            base.contextNode = context.Current.Clone();
            base.contextNode.MoveToRoot();
            count = 0;
            return this;
        }

        public override XPathNavigator? MatchNode(XPathNavigator? context)
        {
            if (context != null && context.NodeType == XPathNodeType.Root)
            {
                return context;
            }
            return null;
        }

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