/// <inheritdoc />
/// <summary>
/// Remove an <c>IMediator</c> from the <c>View</c>.
/// </summary>
/// <param name="mediatorName">name of the <c>IMediator</c> instance to be removed.</param>
/// <returns>the <c>IMediator</c> that was removed from the <c>View</c></returns>
public virtual IMediator RemoveMediator(string mediatorName)
{
if (!MediatorMap.ContainsKey(mediatorName))
{
return(null);
}
var mediator = MediatorMap[mediatorName];
var interests = mediator.ListNotificationInterests();
foreach (var i in interests)
{
RemoveObserver(i, mediator);
}
mediator.OnRemove();
return(mediator);
}
/// <inheritdoc />
/// <summary>
/// Register an <c>IMediator</c> instance with the <c>View</c>.
/// </summary>
/// <remarks>
/// <para>
/// Registers the <c>IMediator</c> so that it can be retrieved by name,
/// and further interrogates the <c>IMediator</c> for its
/// <c>INotification</c> interests.
/// </para>
/// <para>
/// If the <c>IMediator</c> returns any <c>INotification</c>
/// names to be notified about, an <c>Observer</c> is created encapsulating
/// the <c>IMediator</c> instance's <c>handleNotification</c> method
/// and registering it as an <c>Observer</c> for all <c>INotifications</c> the
/// <c>IMediator</c> is interested in.
/// </para>
/// </remarks>
/// <param name="mediator">the name to associate with this <c>IMediator</c> instance</param>
public virtual void RegisterMediator(IMediator mediator)
{
if (MediatorMap.ContainsKey(mediator.MediatorName))
{
return;
}
MediatorMap[mediator.MediatorName] = mediator;
var interests = mediator.ListNotificationInterests();
if (interests.Length > 0)
{
var observer = new Observer(mediator.HandleNotification, mediator);
foreach (var i in interests)
{
RegisterObserver(i, observer);
}
}
// alert the mediator that it has been registered
mediator.OnRegister();
}
/// <inheritdoc />
/// <summary>
/// Check if a Mediator is registered or not
/// </summary>
/// <param name="mediatorName"></param>
/// <returns>whether a Mediator is registered with the given <c>mediatorName</c>.</returns>
public virtual bool HasMediator(string mediatorName)
{
return(MediatorMap.ContainsKey(mediatorName));
}