/// <summary>
/// Modifies the <see cref="AtomFeed"/> optional entities to match the supplied <see cref="XPathNavigator"/> data source.
/// </summary>
/// <param name="feed">The <see cref="AtomFeed"/> to be filled.</param>
/// <param name="source">The <see cref="XPathNavigator"/> to extract information from.</param>
/// <param name="manager">The <see cref="XmlNamespaceManager"/> used to resolve XML namespace prefixes.</param>
/// <param name="settings">The <see cref="SyndicationResourceLoadSettings"/> used to configure the fill operation.</param>
/// <remarks>
/// This method expects the supplied <paramref name="source"/> to be positioned on the XML element that represents a <see cref="AtomFeed"/>.
/// </remarks>
/// <exception cref="ArgumentNullException">The <paramref name="feed"/> is a null reference (Nothing in Visual Basic).</exception>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
/// <exception cref="ArgumentNullException">The <paramref name="manager"/> is a null reference (Nothing in Visual Basic).</exception>
/// <exception cref="ArgumentNullException">The <paramref name="settings"/> is a null reference (Nothing in Visual Basic).</exception>
private static void FillFeedOptionals(AtomFeed feed, XPathNavigator source, XmlNamespaceManager manager, SyndicationResourceLoadSettings settings)
{
Guard.ArgumentNotNull(feed, "feed");
Guard.ArgumentNotNull(source, "source");
Guard.ArgumentNotNull(manager, "manager");
Guard.ArgumentNotNull(settings, "settings");
XPathNavigator generatorNavigator = source.SelectSingleNode("atom:generator", manager);
XPathNavigator copyrightNavigator = source.SelectSingleNode("atom:copyright", manager);
XPathNavigator taglineNavigator = source.SelectSingleNode("atom:tagline", manager);
if (generatorNavigator != null)
{
feed.Generator = Atom03SyndicationResourceAdapter.CreateGenerator(generatorNavigator, manager, settings);
}
if (copyrightNavigator != null)
{
feed.Rights = Atom03SyndicationResourceAdapter.CreateTextContent(copyrightNavigator, manager, settings);
}
if (taglineNavigator != null)
{
feed.Subtitle = Atom03SyndicationResourceAdapter.CreateTextContent(taglineNavigator, manager, settings);
}
}
