BaseTreeIterator.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Xml;
 
internal abstract class BaseTreeIterator
{
    protected DataSetMapper mapper;
 
    internal abstract XmlNode CurrentNode { get; }
 
    internal BaseTreeIterator(DataSetMapper mapper)
    {
        this.mapper = mapper;
    }
 
    [MemberNotNullWhen(true, "CurrentNode")]
    internal abstract bool Next();
 
    [MemberNotNullWhen(true, "CurrentNode")]
    internal abstract bool NextRight();
 
    [MemberNotNullWhen(true, "CurrentNode")]
    internal bool NextRowElement()
    {
        while (Next())
        {
            if (OnRowElement())
            {
                return true;
            }
        }
        return false;
    }
 
    [MemberNotNullWhen(true, "CurrentNode")]
    internal bool NextRightRowElement()
    {
        if (NextRight())
        {
            if (OnRowElement())
            {
                return true;
            }
            return NextRowElement();
        }
        return false;
    }
 
    [MemberNotNullWhen(true, "CurrentNode")]
    internal bool OnRowElement()
    {
        if (CurrentNode is XmlBoundElement xmlBoundElement)
        {
            return xmlBoundElement.Row != null;
        }
        return false;
    }
}