100 lines
3.7 KiB
C#
100 lines
3.7 KiB
C#
//
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// SyndicationVersions.cs
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//
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// Author:
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// Atsushi Enomoto <atsushi@ximian.com>
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//
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// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.IO;
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using System.Runtime.Serialization;
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using System.Text;
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using System.Xml;
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namespace System.ServiceModel.Syndication
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{
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public static class SyndicationVersions
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{
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private enum ReaderKind
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{
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Item,
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Feed,
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}
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public const string Atom10 = "Atom10";
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public const string Rss20 = "Rss20";
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const string AtomNamespace ="http://www.w3.org/2005/Atom";
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static string DetectVersion (XmlReader reader, ReaderKind kind)
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{
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if (reader == null)
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throw new ArgumentNullException ("reader");
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reader.MoveToContent ();
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if (reader.NodeType != XmlNodeType.Element)
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throw new XmlException ("An element is expected for syndication item");
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if (reader.IsStartElement ("rss", String.Empty) && reader.GetAttribute ("version") == "2.0")
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return SyndicationVersions.Rss20;
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if ((kind == ReaderKind.Item && reader.IsStartElement ("entry", AtomNamespace)) ||
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(kind == ReaderKind.Feed && reader.IsStartElement("feed", AtomNamespace)))
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return SyndicationVersions.Atom10;
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else if (reader.IsStartElement ("item", String.Empty))
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return SyndicationVersions.Rss20;
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else
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throw new XmlException (String.Format ("Unexpected syndication item element: name is '{0}' and namespace is '{1}'", reader.LocalName, reader.NamespaceURI));
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}
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internal static TSyndicationFeed LoadFeed<TSyndicationFeed> (XmlReader reader) where TSyndicationFeed : SyndicationFeed, new()
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{
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switch (DetectVersion (reader, ReaderKind.Feed)) {
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case SyndicationVersions.Atom10:
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Atom10FeedFormatter af = new Atom10FeedFormatter<TSyndicationFeed> ();
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af.ReadFrom (reader);
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return (TSyndicationFeed) af.Feed;
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case SyndicationVersions.Rss20:
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default: // anything else are rejected by DetectVersion
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Rss20FeedFormatter rf = new Rss20FeedFormatter<TSyndicationFeed> ();
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rf.ReadFrom (reader);
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return (TSyndicationFeed) rf.Feed;
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}
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}
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internal static TSyndicationItem LoadItem<TSyndicationItem> (XmlReader reader) where TSyndicationItem : SyndicationItem, new()
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{
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switch (DetectVersion (reader, ReaderKind.Item)) {
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case SyndicationVersions.Atom10:
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Atom10ItemFormatter af = new Atom10ItemFormatter<TSyndicationItem> ();
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af.ReadFrom (reader);
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return (TSyndicationItem) af.Item;
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case SyndicationVersions.Rss20:
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default: // anything else are rejected by DetectVersion
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Rss20ItemFormatter rf = new Rss20ItemFormatter<TSyndicationItem> ();
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rf.ReadFrom (reader);
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return (TSyndicationItem) rf.Item;
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}
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}
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}
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}
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