/// <summary>
/// Empieza a observar un espacio
/// </summary>
/// <param name="obj">Objeto a observar</param>
public void ObserveObject (ISpaceable obj)
{
if (IsBeingObserved (obj))
throw new InvalidOperationException ("Object already being observed.");
var state = new ObservationState (obj);
observedObjects.Add (state);
}
/// <summary>
/// Devuelve el estado de observación de un objeto
/// </summary>
/// <remarks>Puede causar <see cref="InvalidOperationException"/> si no esta siendo observado tal objeto</remarks>
/// <returns>El estado de observación del objeto</returns>
public ObservationState GetState (ISpaceable obj)
{
// Recordar que nunca, los objetos observados, son nulos
foreach (var x in observedObjects)
if (object.Equals (x.ObservedObject, obj))
return x;
throw new InvalidOperationException (
string.Format (
"Object {0} is not being observed.",
obj));
}
/// <summary>
/// Determina si un objeto está siendo observado
/// </summary>
public bool IsBeingObserved (ISpaceable obj)
{
return observedObjects.Exists (z => z.ObservedObject.Equals (obj));
}
/// <summary>
/// Deja de observar un espacio
/// </summary>
public void UnobserveObject (ISpaceable obj)
{
observedObjects.RemoveAll (z => z.ObservedObject.Equals (obj));
}
internal ObservationState (ISpaceable observedObject)
{
if (observedObject == null)
throw new ArgumentNullException ("observedObject");
ObservedObject = observedObject;
}
