/// <summary>
/// Extracts syndication feed items.
/// </summary>
/// <param name="localization">The context <see cref="Localization"/>.</param>
/// <returns>A single syndication feed item containing information extracted from this <see cref="Teaser"/>.</returns>
public IEnumerable<SyndicationItem> ExtractSyndicationFeedItems(Localization localization)
{
Link link = Link;
if (link == null && Media != null)
{
// If the Teaser doesn't have a Link, but does have Media, create a Link from its Media.
link = new Link { Url = Media.Url };
}
return new[] { CreateSyndicationItem(Headline, Text, link, Date, localization) };
}
/// <summary>
/// Extracts syndication feed items.
/// </summary>
/// <param name="localization">The context <see cref="Localization"/>.</param>
/// <returns>A single syndication feed item containing information extracted from this <see cref="Teaser"/>.</returns>
public IEnumerable<SyndicationItem> ExtractSyndicationFeedItems(Localization localization)
{
Link downloadLink = new Link {Url = Url};
return new[] { CreateSyndicationItem(FileName, Description, downloadLink, null, localization) };
}
/// <summary>
/// Creates a syndication item link from a given <see cref="Link"/> instance.
/// </summary>
/// <param name="link">The <see cref="Link"/> instance.</param>
/// <param name="localization">The context <see cref="Localization"/>.</param>
/// <returns>The syndication item link or <c>null</c> if <paramref name="link"/> is <c>null</c> or an empty link.</returns>
protected SyndicationLink CreateSyndicationLink(Link link, Localization localization)
{
if (link == null || string.IsNullOrEmpty(link.Url))
{
return null;
}
string absoluteUrl = SiteConfiguration.MakeFullUrl(link.Url, localization);
return new SyndicationLink(new Uri(absoluteUrl));
}
/// <summary>
/// Creates a syndication feed item based on essential data.
/// </summary>
/// <param name="title">The title.</param>
/// <param name="summary">The summary. Can be a string or a <see cref="RichText"/> instance.</param>
/// <param name="link">The link.</param>
/// <param name="publishDate">The date/time this item was published/created. If <c>null</c>, publish date is not included in the feed.</param>
/// <param name="localization">The context <see cref="Localization"/>.</param>
/// <returns>The syndication feed item.</returns>
protected SyndicationItem CreateSyndicationItem(string title, object summary, Link link, DateTime? publishDate, Localization localization)
{
SyndicationItem result = new SyndicationItem
{
Title = new TextSyndicationContent(title),
};
if (summary != null)
{
TextSyndicationContentKind textKind = (summary is RichText) ? TextSyndicationContentKind.Html : TextSyndicationContentKind.Plaintext;
result.Summary = new TextSyndicationContent(summary.ToString(), textKind);
}
SyndicationLink syndicationLink = CreateSyndicationLink(link, localization);
if (syndicationLink != null)
{
result.Links.Add(syndicationLink);
}
if (publishDate.HasValue)
{
result.PublishDate = publishDate.Value;
}
return result;
}