/// <summary>
/// Handles when a statechage is noticed by the external source
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void ExternalSourceInput(object sender, ConnectionStateChangedEventHandlerArgs args)
{
//find all the rules that say something this connection. fire then collect the changes to be made to the states.
var statechangedirectives =
AllRules.Where(r => r.Connections.Any(c => c.Name == args.Connection.Name))
.Select(r => r.Fire(r.Connections.First(r1 => r1.Name == args.Connection.Name), args.NewState))
.SelectMany(s => s);
//do not only send the message back to the source it came from also check if others want to know
//about it.
var externals = ExternalSources.SelectMany(e => e.Connections, (e1, c1) => new { ExternalSource = e1, Connection = c1 }).ToList();
foreach (var stateChangeDirective in statechangedirectives.Where(s => s != StateChangeDirective.NoOperation))
{
var directive = stateChangeDirective;
foreach (var external in externals.Where(e => e.Connection.Name == directive.Connection.Name).Select(e => e.ExternalSource))
{
external.SetState(directive.Connection, directive.NewState.Name);
}
}
if (args.Connection.Copied)
{
externals.First(t => t.Connection.Name == args.Connection.Name && !t.Connection.Copied).ExternalSource.
SetState(args.Connection, args.NewState.Name);
}
else
{
((IExternalSource)sender).SetState(args.Connection, args.NewState.Name);
}
}
/// <summary>
/// resolve the connections to their real ones by their name.
/// </summary>
/// <param name="connectionNames">connection names</param>
/// <returns>a list of connections.</returns>
public IEnumerable <Connection> ResolveConnections(IEnumerable <string> connectionNames)
{
return(ExternalSources.SelectMany(e => e.Connections)
.Where(c => !c.Copied)
.Join(connectionNames, c => c.Name, s => s, (c, s) => c)
.ToList());
}