IteratorFilter.cs

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using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class IteratorFilter : XPathNodeIterator
{
    private readonly XPathNodeIterator _innerIterator;
 
    private readonly string _name;
 
    private int _position;
 
    public override XPathNavigator Current => _innerIterator.Current;
 
    public override int CurrentPosition => _position;
 
    internal IteratorFilter(XPathNodeIterator innerIterator, string name)
    {
        _innerIterator = innerIterator;
        _name = name;
    }
 
    private IteratorFilter(IteratorFilter it)
    {
        _innerIterator = it._innerIterator.Clone();
        _name = it._name;
        _position = it._position;
    }
 
    public override XPathNodeIterator Clone()
    {
        return new IteratorFilter(this);
    }
 
    public override bool MoveNext()
    {
        while (_innerIterator.MoveNext())
        {
            if (_innerIterator.Current.LocalName == _name)
            {
                _position++;
                return true;
            }
        }
        return false;
    }
}