class/System.XML/System.Xml/XmlEntity.cs

   1 //
   2 // System.Xml.XmlEntity.cs
   3 //
   4 // Author:
   5 //      Duncan Mak  (duncan@ximian.com)
   6 //      Atsushi Enomoto  (atsushi@ximian.com)
   7 //
   8 // (C) Ximian, Inc.
   9 // (C) 2004 Novell Inc.
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32 using Mono.Xml;
  33
  34 namespace System.Xml
  35 {
  36         public class XmlEntity : XmlNode, IHasXmlChildNode
  37         {
  38                 #region Constructors
  39
  40                 internal XmlEntity (string name, string NDATA, string publicId, string systemId,
  41                                     XmlDocument doc)
  42                         : base (doc)
  43                 {
  44                         this.name = doc.NameTable.Add (name);
  45                         this.NDATA = NDATA;
  46                         this.publicId = publicId;
  47                         this.systemId = systemId;
  48                         this.baseUri = doc.BaseURI;
  49                 }
  50
  51                 #endregion
  52
  53                 #region Fields
  54
  55                 string name;
  56                 string NDATA;
  57                 string publicId;
  58                 string systemId;
  59                 string baseUri;
  60                 XmlLinkedNode lastLinkedChild;
  61                 bool contentAlreadySet;
  62
  63                 #endregion
  64
  65                 #region Properties
  66
  67                 XmlLinkedNode IHasXmlChildNode.LastLinkedChild {
  68                         get {
  69                                 if (lastLinkedChild != null)
  70                                         return lastLinkedChild;
  71                                 if (!contentAlreadySet) {
  72                                         contentAlreadySet = true;
  73                                         SetEntityContent ();
  74                                 }
  75                                 return lastLinkedChild;
  76                         }
  77                         set { lastLinkedChild = value; }
  78                 }
  79
  80                 public override string BaseURI {
  81                         get {  return baseUri; }
  82                 }
  83
  84                 public override string InnerText {
  85                         get { return base.InnerText; }
  86                         set { throw new InvalidOperationException ("This operation is not supported."); }
  87                 }
  88
  89                 public override string InnerXml {
  90                         get { return base.InnerXml; }
  91                         set { throw new InvalidOperationException ("This operation is not supported."); }
  92                 }
  93
  94                 public override bool IsReadOnly {
  95                         get { return true; } // always read-only.
  96                 }
  97
  98                 public override string LocalName {
  99                         get { return name; }
 100                 }
 101
 102                 public override string Name {
 103                         get { return name; }
 104                 }
 105
 106                 public override XmlNodeType NodeType {
 107                         get { return XmlNodeType.Entity; }
 108                 }
 109
 110                 public string NotationName {
 111                         get {
 112                                 if (NDATA == null)
 113                                         return null;
 114                                 else
 115                                         return NDATA;
 116                         }
 117                 }
 118
 119                 public override string OuterXml {
 120                         get { return String.Empty; }
 121                 }
 122
 123                 public string PublicId {
 124                         get { return publicId; }
 125                 }
 126
 127                 public string SystemId {
 128                         get { return systemId; }
 129                 }
 130                 #endregion
 131
 132                 #region Methods
 133
 134                 public override XmlNode CloneNode (bool deep)
 135                 {
 136                         throw new InvalidOperationException ("This operation is not supported.");
 137                 }
 138
 139                 public override void WriteContentTo (XmlWriter w)
 140                 {
 141                         // No effect.
 142                 }
 143
 144                 public override void WriteTo (XmlWriter w)
 145                 {
 146                         // No effect.
 147                 }
 148
 149                 void SetEntityContent ()
 150                 {
 151                         if (lastLinkedChild != null)
 152                                 return;
 153
 154                         XmlDocumentType doctype = OwnerDocument.DocumentType;
 155
 156                         if (doctype == null)
 157                                 return;
 158
 159                         DTDEntityDeclaration decl = doctype.DTD.EntityDecls [name];
 160                         if (decl == null)
 161                                 return;
 162
 163                         XmlNamespaceManager nsmgr = this.ConstructNamespaceManager ();
 164                         XmlParserContext ctx = new XmlParserContext (OwnerDocument.NameTable, nsmgr,
 165                                 doctype != null ? doctype.DTD : null,
 166                                 BaseURI, XmlLang, XmlSpace, null);
 167                         XmlTextReader xmlReader = new XmlTextReader (decl.EntityValue, XmlNodeType.Element, ctx);
 168                         xmlReader.XmlResolver = OwnerDocument.Resolver;
 169
 170                         do {
 171                                 XmlNode n = OwnerDocument.ReadNode (xmlReader);
 172                                 if(n == null) break;
 173                                 InsertBefore (n, null, false, false);
 174                         } while (true);
 175                 }
 176                 #endregion
 177         }
 178 }