2 // SyndicationVersions.cs
5 // Atsushi Enomoto <atsushi@ximian.com>
7 // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
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:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
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.
29 using System
.Collections
.Generic
;
30 using System
.Collections
.ObjectModel
;
32 using System
.Runtime
.Serialization
;
36 namespace System
.ServiceModel
.Syndication
38 public static class SyndicationVersions
40 private enum ReaderKind
46 public const string Atom10
= "Atom10";
47 public const string Rss20
= "Rss20";
49 const string AtomNamespace
="http://www.w3.org/2005/Atom";
51 static string DetectVersion (XmlReader reader
, ReaderKind kind
)
54 throw new ArgumentNullException ("reader");
55 reader
.MoveToContent ();
56 if (reader
.NodeType
!= XmlNodeType
.Element
)
57 throw new XmlException ("An element is expected for syndication item");
58 if (reader
.IsStartElement ("rss", String
.Empty
) && reader
.GetAttribute ("version") == "2.0")
59 return SyndicationVersions
.Rss20
;
60 if ((kind
== ReaderKind
.Item
&& reader
.IsStartElement ("entry", AtomNamespace
)) ||
61 (kind
== ReaderKind
.Feed
&& reader
.IsStartElement("feed", AtomNamespace
)))
62 return SyndicationVersions
.Atom10
;
63 else if (reader
.IsStartElement ("item", String
.Empty
))
64 return SyndicationVersions
.Rss20
;
66 throw new XmlException (String
.Format ("Unexpected syndication item element: name is '{0}' and namespace is '{1}'", reader
.LocalName
, reader
.NamespaceURI
));
69 internal static TSyndicationFeed LoadFeed
<TSyndicationFeed
> (XmlReader reader
) where TSyndicationFeed
: SyndicationFeed
, new()
71 switch (DetectVersion (reader
, ReaderKind
.Feed
)) {
72 case SyndicationVersions
.Atom10
:
73 Atom10FeedFormatter af
= new Atom10FeedFormatter
<TSyndicationFeed
> ();
75 return (TSyndicationFeed
) af
.Feed
;
76 case SyndicationVersions
.Rss20
:
77 default: // anything else are rejected by DetectVersion
78 Rss20FeedFormatter rf
= new Rss20FeedFormatter
<TSyndicationFeed
> ();
80 return (TSyndicationFeed
) rf
.Feed
;
84 internal static TSyndicationItem LoadItem
<TSyndicationItem
> (XmlReader reader
) where TSyndicationItem
: SyndicationItem
, new()
86 switch (DetectVersion (reader
, ReaderKind
.Item
)) {
87 case SyndicationVersions
.Atom10
:
88 Atom10ItemFormatter af
= new Atom10ItemFormatter
<TSyndicationItem
> ();
90 return (TSyndicationItem
) af
.Item
;
91 case SyndicationVersions
.Rss20
:
92 default: // anything else are rejected by DetectVersion
93 Rss20ItemFormatter rf
= new Rss20ItemFormatter
<TSyndicationItem
> ();
95 return (TSyndicationItem
) rf
.Item
;