XPathNavigatorKeyComparer.cs

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using System.Collections;
using MS.Internal.Xml.Cache;
 
namespace System.Xml.XPath;
 
internal sealed class XPathNavigatorKeyComparer : IEqualityComparer
{
    bool IEqualityComparer.Equals(object obj1, object obj2)
    {
        XPathNavigator xPathNavigator = obj1 as XPathNavigator;
        XPathNavigator xPathNavigator2 = obj2 as XPathNavigator;
        if (xPathNavigator != null && xPathNavigator2 != null && xPathNavigator.IsSamePosition(xPathNavigator2))
        {
            return true;
        }
        return false;
    }
 
    int IEqualityComparer.GetHashCode(object obj)
    {
        if (obj == null)
        {
            throw new ArgumentNullException("obj");
        }
        if (obj is XPathDocumentNavigator xPathDocumentNavigator)
        {
            return xPathDocumentNavigator.GetPositionHashCode();
        }
        if (obj is XPathNavigator xPathNavigator)
        {
            object underlyingObject = xPathNavigator.UnderlyingObject;
            if (underlyingObject != null)
            {
                return underlyingObject.GetHashCode();
            }
            int nodeType = (int)xPathNavigator.NodeType;
            nodeType ^= xPathNavigator.LocalName.GetHashCode();
            nodeType ^= xPathNavigator.Prefix.GetHashCode();
            return nodeType ^ xPathNavigator.NamespaceURI.GetHashCode();
        }
        return obj.GetHashCode();
    }
}