public void setSourceEntity(ConcreteEntity e)
 {
     this._source = (PlayableConcreteEntity)e;
 }
 /// <summary>
 /// réception de la target
 /// </summary>
 /// <param name="o">ITarget</param>
 public void setTarget(ITarget o)
 {
     this._target = (PlayableConcreteEntity)o;
 }