XmlILIndex.cs

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using System.Collections.Generic;
using System.ComponentModel;
using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
[EditorBrowsable(EditorBrowsableState.Never)]
public sealed class XmlILIndex
{
    private readonly Dictionary<string, XmlQueryNodeSequence> _table;
 
    internal XmlILIndex()
    {
        _table = new Dictionary<string, XmlQueryNodeSequence>();
    }
 
    public void Add(string key, XPathNavigator navigator)
    {
        if (!_table.TryGetValue(key, out var value))
        {
            value = new XmlQueryNodeSequence();
            value.AddClone(navigator);
            _table.Add(key, value);
        }
        else if (!navigator.IsSamePosition(value[value.Count - 1]))
        {
            value.AddClone(navigator);
        }
    }
 
    public XmlQueryNodeSequence Lookup(string key)
    {
        if (!_table.TryGetValue(key, out var value))
        {
            return new XmlQueryNodeSequence();
        }
        return value;
    }
}