XmlBoundElement.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / NewXml / XmlBoundElement.cs / 1 / XmlBoundElement.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 
namespace System.Xml {
    using System; 
    using System.IO;
    using System.Collections;
    using System.Data;
    using System.Diagnostics; 

    internal enum ElementState { 
        None, 
        Defoliated,
        WeakFoliation, 
        StrongFoliation,
        Foliating,
        Defoliating,
    } 

    internal sealed class XmlBoundElement: XmlElement { 
        private DataRow row; 
        private ElementState state;
 
        internal XmlBoundElement( string prefix, string localName, string namespaceURI, XmlDocument doc )
        : base( prefix, localName, namespaceURI, doc ) {
            state = ElementState.None;
        } 

        public override XmlAttributeCollection Attributes { 
            get { 
                AutoFoliate();
                return base.Attributes; 
            }
        }

        public override bool HasAttributes { 
            get { return Attributes.Count > 0; }
        } 
 
        public override XmlNode FirstChild {
            get { 
                AutoFoliate();
                return base.FirstChild;
            }
        } 

        internal XmlNode SafeFirstChild { get { return base.FirstChild; } } 
 
        public override XmlNode LastChild {
            get { 
                AutoFoliate();
                return base.LastChild;
            }
        } 

        public override XmlNode PreviousSibling { 
            get { 
                XmlNode prev = base.PreviousSibling;
                if ( prev == null ) { 
                    XmlBoundElement parent = ParentNode as XmlBoundElement;
                    if ( parent != null ) {
                        parent.AutoFoliate();
                        return base.PreviousSibling; 
                    }
                } 
                return prev; 
            }
        } 

        internal XmlNode SafePreviousSibling { get { return base.PreviousSibling; } }

        public override XmlNode NextSibling { 
            get {
                XmlNode next = base.NextSibling; 
                if ( next == null ) { 
                    XmlBoundElement parent = ParentNode as XmlBoundElement;
                    if ( parent != null ) { 
                        parent.AutoFoliate();
                        return base.NextSibling;
                    }
                } 
                return next;
            } 
        } 

        internal XmlNode SafeNextSibling { get { return base.NextSibling; } } 

        public override bool HasChildNodes {
            get {
                AutoFoliate(); 
                return base.HasChildNodes;
            } 
        } 

        public override XmlNode InsertBefore(XmlNode newChild, XmlNode refChild) { 
            AutoFoliate();
            return base.InsertBefore( newChild, refChild );
        }
 
        public override XmlNode InsertAfter(XmlNode newChild, XmlNode refChild) {
            AutoFoliate(); 
            return base.InsertAfter( newChild, refChild ); 
        }
 
        public override XmlNode ReplaceChild(XmlNode newChild, XmlNode oldChild) {
            AutoFoliate();
            return base.ReplaceChild( newChild, oldChild );
        } 

        public override XmlNode AppendChild(XmlNode newChild) { 
            AutoFoliate(); 
            return base.AppendChild( newChild );
        } 

        internal void RemoveAllChildren() {
            XmlNode child = FirstChild;
            XmlNode sibling = null; 

            while ( child != null ) { 
                sibling = child.NextSibling; 
                RemoveChild( child );
                child = sibling; 
            }
        }

        public override string InnerXml { 
            get {
                return base.InnerXml; 
            } 
            set {
 
                RemoveAllChildren();

                XmlDataDocument doc = (XmlDataDocument) OwnerDocument;
 
                bool bOrigIgnoreXmlEvents = doc.IgnoreXmlEvents;
                bool bOrigIgnoreDataSetEvents = doc.IgnoreDataSetEvents; 
 
                doc.IgnoreXmlEvents = true;
                doc.IgnoreDataSetEvents = true; 

                base.InnerXml = value;

                doc.SyncTree( this ); 

                doc.IgnoreDataSetEvents = bOrigIgnoreDataSetEvents; 
                doc.IgnoreXmlEvents = bOrigIgnoreXmlEvents; 
            }
        } 

        internal DataRow Row {
            get { return row;}
            set { row = value;} 
        }
 
        internal bool IsFoliated { 
            get {
                while ( state == ElementState.Foliating || state == ElementState.Defoliating ) 
                    System.Threading.Thread.Sleep(0);
                //has to be sure that we are either foliated or defoliated when ask for IsFoliated.
                return state != ElementState.Defoliated;
            } 
        }
 
        internal ElementState ElementState { 
            get { return state;}
            set { state = value;} 
        }

        internal void Foliate( ElementState newState ) {
            XmlDataDocument doc = (XmlDataDocument) OwnerDocument; 
            if ( doc != null )
                doc.Foliate( this, newState ); 
        } 

        // Foliate the node as a side effect of user calling functions on this node (like NextSibling) OR as a side effect of DataDocNav using nodes to do editing 
        private void AutoFoliate() {
            XmlDataDocument doc = (XmlDataDocument) OwnerDocument;
            if ( doc != null )
                doc.Foliate( this, doc.AutoFoliationState ); 
        }
 
        public override XmlNode CloneNode(bool deep) { 
            XmlDataDocument doc = (XmlDataDocument)(this.OwnerDocument);
            ElementState oldAutoFoliationState = doc.AutoFoliationState; 
            doc.AutoFoliationState = ElementState.WeakFoliation;
            XmlElement element;
            try {
                Foliate( ElementState.WeakFoliation ); 
                element = (XmlElement)(base.CloneNode( deep ));
                // Clone should create a XmlBoundElement node 
                Debug.Assert( element is XmlBoundElement ); 
            }
            finally { 
                doc.AutoFoliationState = oldAutoFoliationState;
            }

            return element; 
        }
 
        public override void WriteContentTo( XmlWriter w ) { 
            DataPointer dp = new DataPointer( (XmlDataDocument)OwnerDocument, this );
            try { 
                dp.AddPointer();
                WriteBoundElementContentTo( dp, w );
            }
            finally { 
                dp.SetNoLongerUse();
            } 
        } 

        public override void WriteTo( XmlWriter w ) { 
            DataPointer dp = new DataPointer( (XmlDataDocument)OwnerDocument, this );
            try {
                dp.AddPointer();
                WriteRootBoundElementTo( dp, w ); 
            }
            finally { 
                dp.SetNoLongerUse(); 
            }
        } 

        private void WriteRootBoundElementTo(DataPointer dp, XmlWriter w) {
            Debug.Assert( dp.NodeType == XmlNodeType.Element );
            XmlDataDocument doc = (XmlDataDocument)OwnerDocument; 
            w.WriteStartElement( dp.Prefix, dp.LocalName, dp.NamespaceURI );
            int cAttr = dp.AttributeCount; 
            bool bHasXSI = false; 
            if ( cAttr > 0 ) {
                for ( int iAttr = 0; iAttr < cAttr; iAttr++ ) { 
                    dp.MoveToAttribute( iAttr );
                    if ( dp.Prefix == "xmlns" && dp.LocalName == XmlDataDocument.XSI )
                        bHasXSI = true;
                    WriteTo( dp, w ); 
                    dp.MoveToOwnerElement();
                } 
            } 

            if ( !bHasXSI && doc.bLoadFromDataSet && doc.bHasXSINIL ) 
                w.WriteAttributeString( "xmlns", "xsi", "http://www.w3.org/2000/xmlns/", Keywords.XSINS );


            WriteBoundElementContentTo( dp, w ); 

            // Force long end tag when the elem is not empty, even if there are no children. 
            if ( dp.IsEmptyElement ) 
                w.WriteEndElement();
            else 
                w.WriteFullEndElement();
        }

        private static void WriteBoundElementTo( DataPointer dp, XmlWriter w ) { 
            Debug.Assert( dp.NodeType == XmlNodeType.Element );
            w.WriteStartElement( dp.Prefix, dp.LocalName, dp.NamespaceURI ); 
            int cAttr = dp.AttributeCount; 
            if ( cAttr > 0 ) {
                for ( int iAttr = 0; iAttr < cAttr; iAttr++ ) { 
                    dp.MoveToAttribute( iAttr );
                    WriteTo( dp, w );
                    dp.MoveToOwnerElement();
                } 
            }
 
            WriteBoundElementContentTo( dp, w ); 

            // Force long end tag when the elem is not empty, even if there are no children. 
            if ( dp.IsEmptyElement )
                w.WriteEndElement();
            else
                w.WriteFullEndElement(); 
        }
 
        private static void WriteBoundElementContentTo( DataPointer dp, XmlWriter w ) { 
            if ( !dp.IsEmptyElement && dp.MoveToFirstChild() ) {
                do { 
                    WriteTo( dp, w );
                }
                while ( dp.MoveToNextSibling() );
 
                dp.MoveToParent();
            } 
        } 

        private static void WriteTo( DataPointer dp, XmlWriter w ) { 
            switch ( dp.NodeType ) {
                case XmlNodeType.Attribute:
                    if ( !dp.IsDefault ) {
                        w.WriteStartAttribute( dp.Prefix, dp.LocalName, dp.NamespaceURI ); 

                        if ( dp.MoveToFirstChild() ) { 
                            do { 
                                WriteTo( dp, w );
                            } 
                            while ( dp.MoveToNextSibling() );

                            dp.MoveToParent();
                        } 

                        w.WriteEndAttribute(); 
                    } 
                    break;
 
                case XmlNodeType.Element:
                    WriteBoundElementTo( dp, w );
                    break;
 
                case XmlNodeType.Text:
                    w.WriteString(dp.Value); 
                    break; 

                default: 
                    Debug.Assert( ((IXmlDataVirtualNode)dp).IsOnColumn( null ) );
                    if ( dp.GetNode() != null )
                        dp.GetNode().WriteTo( w );
                    break; 
            }
        } 
 
        public override XmlNodeList GetElementsByTagName(string name) {
            // Retrieving nodes from the returned nodelist may cause foliation which causes new nodes to be created, 
            // so the System.Xml iterator will throw if this happens during iteration. To avoid this, foliate everything
            // before iteration, so iteration will not cause foliation (and as a result of this, creation of new nodes).
            XmlNodeList tempNodeList = base.GetElementsByTagName(name);
 
            int tempint = tempNodeList.Count;
            return tempNodeList; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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XmlBoundElement.cs source code in C# .NET

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