/// <summary>
/// sets the second colleague.
/// </summary>
/// <param name="initColleague">IMediatedObject:: the second Colleague</param>
/// <exception cref="ArgumentNullException" >thrown when initColleague is null</exception>
/// <exception cref="InvalidOperationException" >thrown when Colleague2 is already assigned</exception>
public void SetColleague2(IMediatedObject initColleague)
{
if (Colleague2 != null)
{
throw new InvalidOperationException($"{nameof(Colleague2)} is already assigned.");
}
Colleague2 = initColleague ?? throw new ArgumentNullException(nameof(initColleague));
}
/// <summary>
/// send a message to the colleague
/// </summary>
/// <param name="sender">IColleague:: the sender's object</param>
/// <param name="initMessage">string:: the message</param>
/// <exception cref="ArgumentNullException">thrown when sender is null.</exception>
/// <exception cref="ArgumentException">thrown when sender is not one of the two mediated object</exception>
public void Notify(IMediatedObject sender, string initMessage)
{
if (sender == null)
{
throw new ArgumentNullException(nameof(sender));
}
if (sender == Colleague1)
{
Colleague2.ActOnNotify(initMessage);
}
else if (sender == Colleague2)
{
Colleague1.ActOnNotify(initMessage);
}
else
{
throw new ArgumentException("sender is not a mediated object. ");
}
}
