/* Copyright (c) 2006 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Collections;
using System.Text;
using System.Xml;
using Google.GData.Client;
namespace Google.GData.Extensions{
/// <summary>
/// GData schema extension describing a comments feed.
/// </summary>
public class Comments : IExtensionElement
{
/// <summary>
/// holds the feedLink property
/// </summary>
protected FeedLink feedLink;
/// <summary>
/// Comments feed link.
/// </summary>
public FeedLink FeedLink
{
get { return feedLink; }
set { feedLink = value; }
}
#region Comments Parser
//////////////////////////////////////////////////////////////////////
/// <summary>parses an xml node to create an Comments object</summary>
/// <param name="node">comments node</param>
/// <returns> the created Comments object</returns>
//////////////////////////////////////////////////////////////////////
public static Comments ParseComments(XmlNode node)
{
Tracing.TraceCall();
Comments comments = null;
Tracing.Assert(node != null, "node should not be null");
if (node == null)
{
throw new ArgumentNullException("node");
}
object localname = node.LocalName;
if (localname.Equals(GDataParserNameTable.XmlCommentsElement))
{
comments = new Comments();
if (node.HasChildNodes)
{
foreach (XmlNode commentsChild in node.ChildNodes)
{
if (commentsChild.LocalName == GDataParserNameTable.XmlFeedLinkElement &&
commentsChild.NamespaceURI == BaseNameTable.gNamespace)
{
if (comments.FeedLink == null)
{
comments.FeedLink = FeedLink.ParseFeedLink(commentsChild);
}
else
{
throw new ArgumentException("Only one feedLink is allowed inside the gd:comments");
}
}
}
}
}
if (comments.FeedLink == null)
{
throw new ArgumentException("gd:comments/gd:feedLink is required.");
}
return comments;
}
#endregion
#region overloaded for persistence
//////////////////////////////////////////////////////////////////////
/// <summary>Returns the constant representing this XML element.</summary>
//////////////////////////////////////////////////////////////////////
public string XmlName
{
get { return GDataParserNameTable.XmlCommentsElement; }
}
/// <summary>
/// Persistence method for the Comment object
/// </summary>
/// <param name="writer">the xmlwriter to write into</param>
public void Save(XmlWriter writer)
{
if (FeedLink != null)
{
// only save out if there is something to save
writer.WriteStartElement(BaseNameTable.gDataPrefix, XmlName, BaseNameTable.gNamespace);
FeedLink.Save(writer);
writer.WriteEndElement();
}
}
#endregion
}
}
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