mcs/class/System.ServiceModel.Web/System.ServiceModel.Syndication/XmlSyndicationContent.cs

   1 //
   2 // XmlSyndicationContent.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto  <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 using System;
  29 using System.Collections.Generic;
  30 using System.Collections.ObjectModel;
  31 using System.IO;
  32 using System.Runtime.Serialization;
  33 using System.Text;
  34 using System.Xml;
  35 using System.Xml.Serialization;
  36
  37 namespace System.ServiceModel.Syndication
  38 {
  39         public class XmlSyndicationContent : SyndicationContent
  40         {
  41                 SyndicationElementExtension writer_extension, reader_extension;
  42                 string type;
  43
  44                 public XmlSyndicationContent (XmlReader reader)
  45                 {
  46                         if (reader == null)
  47                                 throw new ArgumentNullException ("reader");
  48                         this.type = reader.GetAttribute ("type");
  49                         reader_extension = new SyndicationElementExtension (reader);
  50                 }
  51
  52                 public XmlSyndicationContent (string type, object dataContractExtension, XmlObjectSerializer dataContractSerializer)
  53                 {
  54                         this.type = type;
  55                         writer_extension = new SyndicationElementExtension (dataContractExtension, dataContractSerializer);
  56                 }
  57
  58                 public XmlSyndicationContent (string type, object xmlSerializerExtension, XmlSerializer serializer)
  59                 {
  60                         this.type = type;
  61                         writer_extension = new SyndicationElementExtension (xmlSerializerExtension, serializer);
  62                 }
  63
  64                 public XmlSyndicationContent (string type, SyndicationElementExtension extension)
  65                 {
  66                         this.type = type;
  67                         if (extension == null)
  68                                 throw new ArgumentNullException ("extension");
  69                         this.writer_extension = extension;
  70                 }
  71
  72                 protected XmlSyndicationContent (XmlSyndicationContent source)
  73                 {
  74                         if (source == null)
  75                                 throw new ArgumentNullException ("source");
  76                         type = source.type;
  77                         writer_extension = source.writer_extension;
  78                         reader_extension = source.reader_extension;
  79                 }
  80
  81                 public override SyndicationContent Clone ()
  82                 {
  83                         return new XmlSyndicationContent (this);
  84                 }
  85
  86                 SyndicationElementExtension extension {
  87                         get { return writer_extension ?? reader_extension; }
  88                 }
  89
  90                 public XmlDictionaryReader GetReaderAtContent ()
  91                 {
  92                         if (writer_extension != null) {
  93                                 // It is messy, but it somehow returns an XmlReader that has wrapper "content" element for non-XmlReader extension...
  94                                 XmlReader r = extension.GetReader ();
  95                                 if (!(r is XmlDictionaryReader))
  96                                         r = XmlDictionaryReader.CreateDictionaryReader (r);
  97                                 var ms = new MemoryStream ();
  98                                 var xw = XmlDictionaryWriter.CreateBinaryWriter (ms);
  99                                 xw.WriteStartElement ("content", Namespaces.Atom10);
 100                                 xw.WriteAttributeString ("type", "text/xml");
 101                                 while (!r.EOF)
 102                                         xw.WriteNode (r, false);
 103                                 xw.WriteEndElement ();
 104                                 xw.Close ();
 105                                 ms.Position = 0;
 106                                 var xr = XmlDictionaryReader.CreateBinaryReader (ms, new XmlDictionaryReaderQuotas ());
 107                                 xr.MoveToContent ();
 108                                 return xr;
 109                         } else {
 110                                 XmlReader r = extension.GetReader ();
 111                                 if (!(r is XmlDictionaryReader))
 112                                         r = XmlDictionaryReader.CreateDictionaryReader (r);
 113                                 return (XmlDictionaryReader) r;
 114                         }
 115                 }
 116
 117                 public TContent ReadContent<TContent> ()
 118                 {
 119                         return extension.GetObject<TContent> ();
 120                 }
 121
 122                 public TContent ReadContent<TContent> (XmlObjectSerializer serializer)
 123                 {
 124                         return extension.GetObject<TContent> (serializer);
 125                 }
 126
 127                 public TContent ReadContent<TContent> (XmlSerializer serializer)
 128                 {
 129                         return extension.GetObject<TContent> (serializer);
 130                 }
 131
 132                 protected override void WriteContentsTo (XmlWriter writer)
 133                 {
 134                         if (reader_extension != null) {
 135                                 // It is messy, but it somehow skips the wrapper element...
 136                                 var xr = extension.GetReader ();
 137                                 if (xr.IsEmptyElement)
 138                                         xr.Read ();
 139                                 else {
 140                                         xr.ReadStartElement (); // skip it
 141                                         while (xr.NodeType != XmlNodeType.EndElement) {
 142                                                 writer.WriteNode (xr, false);
 143                                         }
 144                                         xr.ReadEndElement ();
 145                                 }
 146                         }
 147                         else
 148                                 extension.WriteTo (writer);
 149                 }
 150
 151                 public SyndicationElementExtension Extension {
 152                         get { return writer_extension; }
 153                 }
 154
 155                 public override string Type {
 156                         get { return type ?? "text/xml"; }
 157                 }
 158         }
 159 }