XmlEntityReference.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Dom / XmlEntityReference.cs / 1 / XmlEntityReference.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
// EntityReference objects may be inserted into the structure 
// model when an entity reference is in the source document, or when the user
// wishes to insert an entity reference. Note that  character references and 
// references to predefined entities are considered to be expanded by the
// HTML or XML processor so that characters are represented by their Unicode
// equivalent rather than by an entity reference. Moreover, the XML
// processor may completely expand references to entities while building the 
// structure model, instead of providing EntityReference
// objects. If it does provide such objects, then for a given 
// EntityReference node, it may be that there is no 
// Entity node representing the referenced entity; but if such
// an Entity exists, then the child list of the 
// EntityReference node is the same as that of the
// Entity node. As with the Entity node, all
// descendants of the EntityReference are readonly.
// 

The resolution of the children of the EntityReference (the // replacement value of the referenced Entity) may be lazily // evaluated; actions by the user (such as calling the // childNodes method on the EntityReference node) // are assumed to trigger the evaluation. namespace System.Xml { using System.Diagnostics; // Represents an entity reference node. public class XmlEntityReference : XmlLinkedNode { string name; XmlLinkedNode lastChild; protected internal XmlEntityReference( string name, XmlDocument doc ) : base( doc ) { if ( !doc.IsLoading ) { if ( name.Length > 0 && name[0] == '#' ) { throw new ArgumentException( Res.GetString( Res.Xdom_InvalidCharacter_EntityReference ) ); } } this.name = doc.NameTable.Add(name); doc.fEntRefNodesPresent = true; } // Gets the name of the node. public override string Name { get { return name;} } // Gets the name of the node without the namespace prefix. public override string LocalName { get { return name;} } // Gets or sets the value of the node. public override String Value { get { return null; } set { throw new InvalidOperationException(Res.GetString(Res.Xdom_EntRef_SetVal)); } } // Gets the type of the node. public override XmlNodeType NodeType { get { return XmlNodeType.EntityReference;} } // Creates a duplicate of this node. public override XmlNode CloneNode(bool deep) { Debug.Assert( OwnerDocument != null ); XmlEntityReference eref = OwnerDocument.CreateEntityReference( name ); return eref; } // // Microsoft extensions // // Gets a value indicating whether the node is read-only. public override bool IsReadOnly { get { return true; // Make entity references readonly } } internal override bool IsContainer { get { return true;} } internal override void SetParent( XmlNode node ) { base.SetParent(node); if ( LastNode == null && node != null && node != OwnerDocument ) { //first time insert the entity reference into the tree, we should expand its children now XmlLoader loader = new XmlLoader(); loader.ExpandEntityReference(this); } } internal override void SetParentForLoad( XmlNode node ) { this.SetParent( node ); } internal override XmlLinkedNode LastNode { get { return lastChild; } set { lastChild = value;} } internal override bool IsValidChildType( XmlNodeType type ) { switch (type) { case XmlNodeType.Element: case XmlNodeType.Text: case XmlNodeType.EntityReference: case XmlNodeType.Comment: case XmlNodeType.Whitespace: case XmlNodeType.SignificantWhitespace: case XmlNodeType.ProcessingInstruction: case XmlNodeType.CDATA: return true; default: return false; } } // Saves the node to the specified XmlWriter. public override void WriteTo(XmlWriter w) { w.WriteEntityRef(name); } // Saves all the children of the node to the specified XmlWriter. public override void WriteContentTo(XmlWriter w) { // -- eventually will the fix. commented out waiting for finalizing on the issue. foreach( XmlNode n in this ) { n.WriteTo( w ); } //still use the old code to generate the output /* foreach( XmlNode n in this ) { if ( n.NodeType != XmlNodeType.EntityReference ) n.WriteTo( w ); else n.WriteContentTo( w ); }*/ } public override String BaseURI { get { return OwnerDocument.BaseURI; } } private string ConstructBaseURI( string baseURI, string systemId ) { if ( baseURI == null ) return systemId; int nCount = baseURI.LastIndexOf('/')+1; string buf = baseURI; if ( nCount > 0 && nCount < baseURI.Length ) buf = baseURI.Substring(0, nCount); else if ( nCount == 0 ) buf = buf + "\\"; return (buf + systemId.Replace('\\', '/')); } //childrenBaseURI returns where the entity reference node's children come from internal String ChildBaseURI { get { //get the associate entity and return its baseUri XmlEntity ent = OwnerDocument.GetEntityNode( name ); if ( ent != null ) { if ( ent.SystemId != null && ent.SystemId.Length > 0 ) return ConstructBaseURI(ent.BaseURI, ent.SystemId); else return ent.BaseURI; } return String.Empty; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.

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