XmlAttribute.cs

using System.Xml.Schema;
using System.Xml.XPath;

namespace System.Xml
{
    public class XmlAttribute : XmlNode
    {
        private XmlName name;

        private XmlLinkedNode lastChild;

        internal int LocalNameHash => name.HashCode;

        internal XmlName XmlName
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }

        public override XmlNode ParentNode => null;

        public override string Name => name.Name;

        public override string LocalName => name.LocalName;

        public override string NamespaceURI => name.NamespaceURI;

        public override string Prefix
        {
            get
            {
                return name.Prefix;
            }
            set
            {
                name = name.OwnerDocument.AddAttrXmlName(value, LocalName, NamespaceURI, SchemaInfo);
            }
        }

        public override XmlNodeType NodeType => XmlNodeType.Attribute;

        public override XmlDocument OwnerDocument => name.OwnerDocument;

        public override string Value
        {
            get
            {
                return InnerText;
            }
            set
            {
                InnerText = value;
            }
        }

        public override IXmlSchemaInfo SchemaInfo => name;

        public override string InnerText
        {
            set
            {
                if (PrepareOwnerElementInElementIdAttrMap())
                {
                    string innerText = base.InnerText;
                    base.InnerText = value;
                    ResetOwnerElementInElementIdAttrMap(innerText);
                }
                else
                {
                    base.InnerText = value;
                }
            }
        }

        internal override bool IsContainer => true;

        internal override XmlLinkedNode LastNode
        {
            get
            {
                return lastChild;
            }
            set
            {
                lastChild = value;
            }
        }

        public virtual bool Specified => true;

        public virtual XmlElement OwnerElement => parentNode as XmlElement;

        public override string InnerXml
        {
            set
            {
                RemoveAll();
                XmlLoader xmlLoader = new XmlLoader();
                xmlLoader.LoadInnerXmlAttribute(this, value);
            }
        }

        public override string BaseURI
        {
            get
            {
                if (OwnerElement != null)
                {
                    return OwnerElement.BaseURI;
                }
                return string.Empty;
            }
        }

        internal override XmlSpace XmlSpace
        {
            get
            {
                if (OwnerElement != null)
                {
                    return OwnerElement.XmlSpace;
                }
                return XmlSpace.None;
            }
        }

        internal override string XmlLang
        {
            get
            {
                if (OwnerElement != null)
                {
                    return OwnerElement.XmlLang;
                }
                return string.Empty;
            }
        }

        internal override XPathNodeType XPNodeType
        {
            get
            {
                if (IsNamespace)
                {
                    return XPathNodeType.Namespace;
                }
                return XPathNodeType.Attribute;
            }
        }

        internal override string XPLocalName
        {
            get
            {
                if (name.Prefix.Length == 0 && name.LocalName == "xmlns")
                {
                    return string.Empty;
                }
                return name.LocalName;
            }
        }

        internal bool IsNamespace => Ref.Equal(name.NamespaceURI, name.OwnerDocument.strReservedXmlns);

        internal XmlAttribute(XmlName name, XmlDocument doc)
            : base(doc)
        {
            parentNode = null;
            if (!doc.IsLoading)
            {
                XmlDocument.CheckName(name.Prefix);
                XmlDocument.CheckName(name.LocalName);
            }
            if (name.LocalName.Length == 0)
            {
                throw new ArgumentException(Res.GetString("Xdom_Attr_Name"));
            }
            this.name = name;
        }

        protected internal XmlAttribute(string prefix, string localName, string namespaceURI, XmlDocument doc)
            : this(doc.AddAttrXmlName(prefix, localName, namespaceURI, null), doc)
        {
        }

        public override XmlNode CloneNode(bool deep)
        {
            XmlDocument ownerDocument = OwnerDocument;
            XmlAttribute xmlAttribute = ownerDocument.CreateAttribute(Prefix, LocalName, NamespaceURI);
            xmlAttribute.CopyChildren(ownerDocument, this, deep: true);
            return xmlAttribute;
        }

        internal bool PrepareOwnerElementInElementIdAttrMap()
        {
            XmlDocument ownerDocument = OwnerDocument;
            if (ownerDocument.DtdSchemaInfo != null)
            {
                XmlElement ownerElement = OwnerElement;
                if (ownerElement != null)
                {
                    return ownerElement.Attributes.PrepareParentInElementIdAttrMap(Prefix, LocalName);
                }
            }
            return false;
        }

        internal void ResetOwnerElementInElementIdAttrMap(string oldInnerText)
        {
            OwnerElement?.Attributes.ResetParentInElementIdAttrMap(oldInnerText, InnerText);
        }

        internal override XmlNode AppendChildForLoad(XmlNode newChild, XmlDocument doc)
        {
            XmlNodeChangedEventArgs insertEventArgsForLoad = doc.GetInsertEventArgsForLoad(newChild, this);
            if (insertEventArgsForLoad != null)
            {
                doc.BeforeEvent(insertEventArgsForLoad);
            }
            XmlLinkedNode xmlLinkedNode = (XmlLinkedNode)newChild;
            if (lastChild == null)
            {
                xmlLinkedNode.next = xmlLinkedNode;
                lastChild = xmlLinkedNode;
                xmlLinkedNode.SetParentForLoad(this);
            }
            else
            {
                XmlLinkedNode xmlLinkedNode2 = lastChild;
                xmlLinkedNode.next = xmlLinkedNode2.next;
                xmlLinkedNode2.next = xmlLinkedNode;
                lastChild = xmlLinkedNode;
                if (xmlLinkedNode2.IsText && xmlLinkedNode.IsText)
                {
                    XmlNode.NestTextNodes(xmlLinkedNode2, xmlLinkedNode);
                }
                else
                {
                    xmlLinkedNode.SetParentForLoad(this);
                }
            }
            if (insertEventArgsForLoad != null)
            {
                doc.AfterEvent(insertEventArgsForLoad);
            }
            return xmlLinkedNode;
        }

        internal override bool IsValidChildType(XmlNodeType type)
        {
            if (type != XmlNodeType.Text)
            {
                return type == XmlNodeType.EntityReference;
            }
            return true;
        }

        public override XmlNode InsertBefore(XmlNode newChild, XmlNode refChild)
        {
            XmlNode result;
            if (PrepareOwnerElementInElementIdAttrMap())
            {
                string innerText = InnerText;
                result = base.InsertBefore(newChild, refChild);
                ResetOwnerElementInElementIdAttrMap(innerText);
            }
            else
            {
                result = base.InsertBefore(newChild, refChild);
            }
            return result;
        }

        public override XmlNode InsertAfter(XmlNode newChild, XmlNode refChild)
        {
            XmlNode result;
            if (PrepareOwnerElementInElementIdAttrMap())
            {
                string innerText = InnerText;
                result = base.InsertAfter(newChild, refChild);
                ResetOwnerElementInElementIdAttrMap(innerText);
            }
            else
            {
                result = base.InsertAfter(newChild, refChild);
            }
            return result;
        }

        public override XmlNode ReplaceChild(XmlNode newChild, XmlNode oldChild)
        {
            XmlNode result;
            if (PrepareOwnerElementInElementIdAttrMap())
            {
                string innerText = InnerText;
                result = base.ReplaceChild(newChild, oldChild);
                ResetOwnerElementInElementIdAttrMap(innerText);
            }
            else
            {
                result = base.ReplaceChild(newChild, oldChild);
            }
            return result;
        }

        public override XmlNode RemoveChild(XmlNode oldChild)
        {
            XmlNode result;
            if (PrepareOwnerElementInElementIdAttrMap())
            {
                string innerText = InnerText;
                result = base.RemoveChild(oldChild);
                ResetOwnerElementInElementIdAttrMap(innerText);
            }
            else
            {
                result = base.RemoveChild(oldChild);
            }
            return result;
        }

        public override XmlNode PrependChild(XmlNode newChild)
        {
            XmlNode result;
            if (PrepareOwnerElementInElementIdAttrMap())
            {
                string innerText = InnerText;
                result = base.PrependChild(newChild);
                ResetOwnerElementInElementIdAttrMap(innerText);
            }
            else
            {
                result = base.PrependChild(newChild);
            }
            return result;
        }

        public override XmlNode AppendChild(XmlNode newChild)
        {
            XmlNode result;
            if (PrepareOwnerElementInElementIdAttrMap())
            {
                string innerText = InnerText;
                result = base.AppendChild(newChild);
                ResetOwnerElementInElementIdAttrMap(innerText);
            }
            else
            {
                result = base.AppendChild(newChild);
            }
            return result;
        }

        public override void WriteTo(XmlWriter w)
        {
            w.WriteStartAttribute(Prefix, LocalName, NamespaceURI);
            WriteContentTo(w);
            w.WriteEndAttribute();
        }

        public override void WriteContentTo(XmlWriter w)
        {
            for (XmlNode xmlNode = FirstChild; xmlNode != null; xmlNode = xmlNode.NextSibling)
            {
                xmlNode.WriteTo(w);
            }
        }

        internal override void SetParent(XmlNode node)
        {
            parentNode = node;
        }
    }
}