XPathArrayIterator.cs

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using System;
using System.Collections;
using System.Diagnostics;
using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
[DebuggerDisplay("Position={CurrentPosition}, Current={debuggerDisplayProxy, nq}")]
internal class XPathArrayIterator : ResetableIterator
{
    protected IList list;
 
    protected int index;
 
    public IList AsList => list;
 
    public override XPathNavigator Current
    {
        get
        {
            if (index < 1)
            {
                throw new InvalidOperationException(System.SR.Format(System.SR.Sch_EnumNotStarted, string.Empty));
            }
            return (XPathNavigator)list[index - 1];
        }
    }
 
    public override int CurrentPosition => index;
 
    public override int Count => list.Count;
 
    private object debuggerDisplayProxy
    {
        get
        {
            if (index >= 1)
            {
                return new XPathNavigator.DebuggerDisplayProxy(Current);
            }
            return null;
        }
    }
 
    public XPathArrayIterator(IList list)
    {
        this.list = list;
    }
 
    public XPathArrayIterator(XPathArrayIterator it)
    {
        list = it.list;
        index = it.index;
    }
 
    public XPathArrayIterator(XPathNodeIterator nodeIterator)
    {
        list = new ArrayList();
        while (nodeIterator.MoveNext())
        {
            list.Add(nodeIterator.Current.Clone());
        }
    }
 
    public override XPathNodeIterator Clone()
    {
        return new XPathArrayIterator(this);
    }
 
    public override bool MoveNext()
    {
        if (index == list.Count)
        {
            return false;
        }
        index++;
        return true;
    }
 
    public override void Reset()
    {
        index = 0;
    }
 
    public override IEnumerator GetEnumerator()
    {
        return list.GetEnumerator();
    }
}