/// <summary>
/// Creates an <see cref="XmlReader" /> for reading an Atom feed from
/// the provided <see cref="Uri" />.
/// </summary>
/// <param name="href">
/// The relative <see cref="Uri" /> of the Atom feed to read.
/// </param>
/// <returns>
/// An <see cref="XmlReader" /> over the Atom feed identified by
/// <paramref name="href" />.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="href" /> is <see langword="null" />.
/// </exception>
/// <remarks>
/// <para>
/// This method attempts to find a file corresponding to
/// <paramref name="href" />. If the file is found, an
/// <see cref="XmlReader" /> over that file is created and returned. If
/// the file isn't found, an XmlReader over an empty Atom Feed is
/// returned. In this case, no file is created for the empty Atom Feed.
/// In other words: this method has no observable side-effects.
/// </para>
/// </remarks>
public XmlReader CreateFeedReaderFor(Uri href)
{
if (href == null)
{
throw new ArgumentNullException("href");
}
var fileName = this.CreateFileName(href);
if (File.Exists(fileName))
{
return(XmlReader.Create(fileName));
}
return(AtomEventStorage.CreateNewFeed(href));
}
public XmlReader CreateFeedReaderFor(Uri href)
{
if (href == null)
{
throw new ArgumentNullException("href");
}
this.rwLock.EnterReadLock();
try
{
if (this.feeds.ContainsKey(href))
{
return(CreateReaderOver(this.feeds[href].ToString()));
}
else
{
return(AtomEventStorage.CreateNewFeed(href));
}
}
finally
{
this.rwLock.ExitReadLock();
}
}