XmlEmptyNavigator.cs

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namespace System.Xml.XPath;
 
internal sealed class XmlEmptyNavigator : XPathNavigator
{
    private static volatile XmlEmptyNavigator s_singleton;
 
    public static XmlEmptyNavigator Singleton
    {
        get
        {
            if (s_singleton == null)
            {
                s_singleton = new XmlEmptyNavigator();
            }
            return s_singleton;
        }
    }
 
    public override XPathNodeType NodeType => XPathNodeType.All;
 
    public override string NamespaceURI => string.Empty;
 
    public override string LocalName => string.Empty;
 
    public override string Name => string.Empty;
 
    public override string Prefix => string.Empty;
 
    public override string BaseURI => string.Empty;
 
    public override string Value => string.Empty;
 
    public override bool IsEmptyElement => false;
 
    public override string XmlLang => string.Empty;
 
    public override bool HasAttributes => false;
 
    public override bool HasChildren => false;
 
    public override XmlNameTable NameTable => new NameTable();
 
    private XmlEmptyNavigator()
    {
    }
 
    public override bool MoveToFirstChild()
    {
        return false;
    }
 
    public override void MoveToRoot()
    {
    }
 
    public override bool MoveToNext()
    {
        return false;
    }
 
    public override bool MoveToPrevious()
    {
        return false;
    }
 
    public override bool MoveToFirst()
    {
        return false;
    }
 
    public override bool MoveToFirstAttribute()
    {
        return false;
    }
 
    public override bool MoveToNextAttribute()
    {
        return false;
    }
 
    public override bool MoveToId(string id)
    {
        return false;
    }
 
    public override string GetAttribute(string localName, string namespaceName)
    {
        return null;
    }
 
    public override bool MoveToAttribute(string localName, string namespaceName)
    {
        return false;
    }
 
    public override string GetNamespace(string name)
    {
        return null;
    }
 
    public override bool MoveToNamespace(string prefix)
    {
        return false;
    }
 
    public override bool MoveToFirstNamespace(XPathNamespaceScope scope)
    {
        return false;
    }
 
    public override bool MoveToNextNamespace(XPathNamespaceScope scope)
    {
        return false;
    }
 
    public override bool MoveToParent()
    {
        return false;
    }
 
    public override bool MoveTo(XPathNavigator other)
    {
        return this == other;
    }
 
    public override XmlNodeOrder ComparePosition(XPathNavigator other)
    {
        if (this != other)
        {
            return XmlNodeOrder.Unknown;
        }
        return XmlNodeOrder.Same;
    }
 
    public override bool IsSamePosition(XPathNavigator other)
    {
        return this == other;
    }
 
    public override XPathNavigator Clone()
    {
        return this;
    }
}