/// <summary>
/// Adds the or replace the optional feed reference element.
/// </summary>
/// <param name="newsItem">The news item.</param>
/// <param name="feedUrl">The feed URL.</param>
/// <param name="sourceID">The source ID.</param>
/// <returns></returns>
public static XmlElement AddOrReplaceOriginalFeedReference(INewsItem newsItem, string feedUrl, int sourceID)
{
if (newsItem == null)
{
throw new ArgumentNullException("newsItem");
}
XmlQualifiedName key = AdditionalElements.GetQualifiedName(OriginalFeedRef);
XmlQualifiedName attrKey = AdditionalElements.GetQualifiedName(OriginalSourceID);
if (newsItem.OptionalElements == null)
{
newsItem.OptionalElements = new Dictionary <XmlQualifiedName, string>(2);
}
if (newsItem.OptionalElements.ContainsKey(key))
{
newsItem.OptionalElements.Remove(key);
}
XmlElement element = RssHelper.CreateXmlElement(Prefix, key, feedUrl);
element.Attributes.Append(RssHelper.CreateXmlAttribute(String.Empty, attrKey, sourceID.ToString()));
newsItem.OptionalElements.Add(key, element.OuterXml);
return(element);
}
/// <summary>
/// Returns the feed URL and source ID of the optional feed reference element for this <paramref name="newsItem"/>.
/// </summary>
/// <param name="newsFeed">The news feed.</param>
/// <param name="sourceID">out: The source ID. -1 in case no source ID is available</param>
/// <returns>
/// The feed URL of the source feed if a pointer to it exists and NULL otherwise.
/// </returns>
public static string GetOriginalFeedReference(INewsFeed newsFeed, out int sourceID)
{
if (newsFeed == null)
{
throw new ArgumentNullException("newsFeed");
}
sourceID = -1;
string feedUrl = null;
XmlQualifiedName key = AdditionalElements.GetQualifiedName(OriginalFeedRef);
XmlQualifiedName attrKey = AdditionalElements.GetQualifiedName(OriginalSourceID);
if (key != null && newsFeed.Any != null && newsFeed.Any.Length > 0)
{
XmlElement origin = newsFeed.Any[0];
feedUrl = origin.InnerText;
if (origin.Attributes.Count > 0)
{
XmlNode a = origin.Attributes.GetNamedItem(attrKey.Name, attrKey.Namespace);
if (a != null)
{
string fs = a.InnerText;
if (!String.IsNullOrEmpty(fs))
{
Int32.TryParse(fs, out sourceID);
}
}
}
}
return(feedUrl);
}
/// <summary>
/// Returns the feed URL and source ID of the optional feed reference element for this <paramref name="newsItem"/>.
/// </summary>
/// <param name="newsItem">The news item.</param>
/// <param name="sourceID">out: The source ID. -1 in case no source ID is available</param>
/// <returns>
/// The feed URL of the source feed if a pointer to it exists and NULL otherwise.
/// </returns>
public static string GetOriginalFeedReference(INewsItem newsItem, out int sourceID)
{
if (newsItem == null)
{
throw new ArgumentNullException("newsItem");
}
sourceID = -1;
string feedUrl = null;
XmlQualifiedName key = AdditionalElements.GetQualifiedName(OriginalFeedRef);
if (key != null && newsItem.OptionalElements.ContainsKey(key))
{
string str = newsItem.OptionalElements[key];
int startIndex = str.IndexOf(">") + 1;
int endIndex = str.LastIndexOf("<");
feedUrl = str.Substring(startIndex, endIndex - startIndex);
endIndex = startIndex;
startIndex = str.IndexOf(OriginalSourceID + "=", 0, endIndex);
if (startIndex > 0)
{
startIndex = startIndex + (OriginalSourceID + "=").Length + 1;
endIndex = str.IndexOf("\"", startIndex);
string fs = str.Substring(startIndex, endIndex - startIndex);
if (!String.IsNullOrEmpty(fs))
{
Int32.TryParse(fs, out sourceID);
}
}
}
return(feedUrl);
}
/// <summary>
/// Removes the optional feed reference element from <paramref name="newsItem"/>'s optional elements.
/// </summary>
/// <param name="newsItem">The news item.</param>
public static void RemoveOriginalFeedReference(INewsItem newsItem)
{
if (newsItem == null)
{
throw new ArgumentNullException("newsItem");
}
XmlQualifiedName key = AdditionalElements.GetQualifiedName(OriginalFeedRef);
if (key != null && newsItem.OptionalElements.ContainsKey(key))
{
newsItem.OptionalElements.Remove(key);
}
}