/// <summary>
/// Adds a connection
/// </summary>
/// <param name="connection">Connection</param>
public virtual void Add(Connection connection)
{
if (this._connections.Contains(connection))
{
return;
}
if (!ConnectionInstancePool.Contains(connection))
{
ConnectionInstancePool.Add(connection);
}
this._connections.Add(connection);
connection.PropertyChanged += this._handler;
this.RaiseAdded(connection);
this.Save();
}
/// <summary>
/// Loads the connections from the underlying graph
/// </summary>
protected virtual void Load()
{
this._connections.Clear();
if (this.Graph.Triples.Count == 0)
{
return;
}
SparqlParameterizedString query = new SparqlParameterizedString();
query.Namespaces.AddNamespace("dnr", new Uri(ConfigurationLoader.ConfigurationNamespace));
query.CommandText = "SELECT * WHERE { ?connection a @type . }";
Graph g = new Graph();
query.SetParameter("type", g.CreateUriNode(UriFactory.Create(ConfigurationLoader.ClassStorageProvider)));
SparqlResultSet results = this.Graph.ExecuteQuery(query) as SparqlResultSet;
if (results == null)
{
return;
}
foreach (SparqlResult r in results)
{
INode connectionNode = r["connection"];
if (connectionNode.NodeType != NodeType.Uri)
{
continue;
}
Uri connectionUri = ((IUriNode)connectionNode).Uri;
Connection connection;
if (!ConnectionInstancePool.TryGetInstance(connectionUri, out connection))
{
connection = new Connection(this.Graph, connectionUri);
ConnectionInstancePool.Add(connection);
}
this._connections.Add(connection);
connection.PropertyChanged += this._handler;
}
}
