/// <summary>Determines the index of a specific item i</summary>
public int IndexOf(IRssChannel value)
{
return (List.IndexOf(value));
}
/// <summary>
/// RssFeedManager implements the operations to create <see cref="RssChannel"/> objects.
/// This class is responsible to manage the cache and is build to work with <see cref="OpmlOutlineFavorite"/> outline.
/// </summary>
/// <param name="outline">The <see cref="OpmlOutlineFavorite"/> of the resource to receive the data.</param>
/// <returns>The requested see cref="IRssChannel" instance</returns>
public IRssChannel GetFeed(OpmlOutlineFavorite outline)
{
Uri uri = new Uri(outline.XmlUrl);
IRssChannel rssChannel = null;
//System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor;
try
{
// never fetched before
if (outline.ExpireDate == DateTime.MinValue || outline.ExpireDate < DateTime.Now)
{
// fetch channel from web
rssChannel = InternalGetFeed(uri);
// save channel to cache
rssChannel.Save(GetCachePathFromUri(uri));
//
if (rssChannel.Ttl > 0)
{
outline.ExpireDate = DateTime.Now.AddMinutes(rssChannel.Ttl);
}
else
{
outline.ExpireDate = DateTime.Now.AddMinutes(3600);
}
//
outline.State = CacheState.Cached;
//
// add/refresh loaded channel to internal non persistent cache list
_rssChannelCacheList[outline] = rssChannel;
}
// check cache
else
{
// cached and not out of date
if (_rssChannelCacheList.Contains(outline))
{
rssChannel = _rssChannelCacheList[outline] as IRssChannel;
}
// cached but out of date, refresh
else
{
// fetch channel from web
rssChannel = InternalGetFeed(new Uri(GetCachePathFromUri(uri)));
outline.State = CacheState.Cached;
// update cache list
_rssChannelCacheList[outline] = rssChannel;
}
}
}
catch (System.Exception e)
{
System.Diagnostics.Debug.WriteLine(e.Message);
outline.State = CacheState.Error;
throw e;
}
finally
{
//System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Default;
}
//
outline.TimesVisited++;
outline.LastVisited = DateTime.Now;
UpdateHistory(outline);
//
return(rssChannel);
}
