//============================================================
// ICOMPARABLE IMPLEMENTATION
//============================================================
#region CompareTo(object obj)
/// <summary>
/// Compares the current instance with another object of the same type.
/// </summary>
/// <param name="obj">An object to compare with this instance.</param>
/// <returns>A 32-bit signed integer that indicates the relative order of the objects being compared.</returns>
/// <exception cref="ArgumentException">The <paramref name="obj"/> is not the expected <see cref="Type"/>.</exception>
public int CompareTo(object obj)
{
//------------------------------------------------------------
// If target is a null reference, instance is greater
//------------------------------------------------------------
if (obj == null)
{
return(1);
}
//------------------------------------------------------------
// Determine comparison result using property state of objects
//------------------------------------------------------------
TrackbackDiscoveryMetadata value = obj as TrackbackDiscoveryMetadata;
if (value != null)
{
int result = Uri.Compare(this.About, value.About, UriComponents.AbsoluteUri, UriFormat.SafeUnescaped, StringComparison.OrdinalIgnoreCase);
result = result | Uri.Compare(this.Identifier, value.Identifier, UriComponents.AbsoluteUri, UriFormat.SafeUnescaped, StringComparison.OrdinalIgnoreCase);
result = result | Uri.Compare(this.PingUrl, value.PingUrl, UriComponents.AbsoluteUri, UriFormat.SafeUnescaped, StringComparison.OrdinalIgnoreCase);
result = result | String.Compare(this.Title, value.Title, StringComparison.OrdinalIgnoreCase);
return(result);
}
else
{
throw new ArgumentException(String.Format(null, "obj is not of type {0}, type was found to be '{1}'.", this.GetType().FullName, obj.GetType().FullName), "obj");
}
}
public static Collection<TrackbackDiscoveryMetadata> ExtractTrackbackNotificationServers(string content)
{
//------------------------------------------------------------
// Local members
//------------------------------------------------------------
Collection<TrackbackDiscoveryMetadata> results = new Collection<TrackbackDiscoveryMetadata>();
Regex rdfPattern = new Regex("<rdf:RDF\b[^>]*>(.*?)</rdf:RDF>", RegexOptions.IgnoreCase | RegexOptions.Singleline);
XmlNamespaceManager manager = new XmlNamespaceManager(new NameTable());
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNullOrEmptyString(content, "content");
//------------------------------------------------------------
// Initialize XML namespace manager with expected namespaces
//------------------------------------------------------------
manager.AddNamespace("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
manager.AddNamespace("dc", "http://purl.org/dc/elements/1.1/");
manager.AddNamespace("trackback", "http://madskills.com/public/xml/rss/module/trackback/");
//------------------------------------------------------------
// Extract <rdf:RDF> elements using pattern matching
//------------------------------------------------------------
MatchCollection embeddedRdfs = rdfPattern.Matches(content);
foreach (Match embeddedRdf in embeddedRdfs)
{
using (StringReader reader = new StringReader(embeddedRdf.Value))
{
XPathDocument document = new XPathDocument(reader);
XPathNavigator navigator = document.CreateNavigator();
TrackbackDiscoveryMetadata trackbackMetadata = new TrackbackDiscoveryMetadata();
if (trackbackMetadata.Load(navigator))
{
results.Add(trackbackMetadata);
}
}
}
return results;
}
