XPathSelectionIterator.cs

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using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class XPathSelectionIterator : ResetableIterator
{
    private XPathNavigator _nav;
 
    private readonly Query _query;
 
    private int _position;
 
    public override int Count => _query.Count;
 
    public override XPathNavigator Current => _nav;
 
    public override int CurrentPosition => _position;
 
    internal XPathSelectionIterator(XPathNavigator nav, Query query)
    {
        _nav = nav.Clone();
        _query = query;
    }
 
    private XPathSelectionIterator(XPathSelectionIterator it)
    {
        _nav = it._nav.Clone();
        _query = (Query)it._query.Clone();
        _position = it._position;
    }
 
    public override void Reset()
    {
        _query.Reset();
    }
 
    public override bool MoveNext()
    {
        XPathNavigator xPathNavigator = _query.Advance();
        if (xPathNavigator != null)
        {
            _position++;
            if (!_nav.MoveTo(xPathNavigator))
            {
                _nav = xPathNavigator.Clone();
            }
            return true;
        }
        return false;
    }
 
    public override XPathNodeIterator Clone()
    {
        return new XPathSelectionIterator(this);
    }
}