XPathDocumentElementChildIterator.cs

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using System;
using System.Xml.XPath;
 
namespace MS.Internal.Xml.Cache;
 
internal sealed class XPathDocumentElementChildIterator : XPathDocumentBaseIterator
{
    private readonly string _localName;
 
    private readonly string _namespaceUri;
 
    public XPathDocumentElementChildIterator(XPathDocumentNavigator parent, string name, string namespaceURI)
        : base(parent)
    {
        if (namespaceURI == null)
        {
            throw new ArgumentNullException("namespaceURI");
        }
        _localName = parent.NameTable.Get(name);
        _namespaceUri = namespaceURI;
    }
 
    public XPathDocumentElementChildIterator(XPathDocumentElementChildIterator iter)
        : base(iter)
    {
        _localName = iter._localName;
        _namespaceUri = iter._namespaceUri;
    }
 
    public override XPathNodeIterator Clone()
    {
        return new XPathDocumentElementChildIterator(this);
    }
 
    public override bool MoveNext()
    {
        if (pos == 0)
        {
            if (!ctxt.MoveToChild(_localName, _namespaceUri))
            {
                return false;
            }
        }
        else if (!ctxt.MoveToNext(_localName, _namespaceUri))
        {
            return false;
        }
        pos++;
        return true;
    }
}