/**
   * Checks if the handler can handle the given type, and if so, returns an
   * instance for handling it. This is ony used for handlers that are registered
   * with the {@link Registry}.
   *
   * @param type
   *          A type that wants to be handled
   * @return An {@link IHandler} to handle the given type, if possible. <code>null</code otherwise.
   */
  default IHandler<? extends T> getHandler(Type type) {
    return isAssignable(getRootType(), type) ? this : null;
  }

  /**
   * Utility method for simple handlers that handle a single class. Only used by
   * {@link #getHandler(Type)}.
   *
   * @return The {@link #getClass()} this handler can handle.
   */
  default Class<?> getRootType() {
    // Should be equivalent to null without being null. Nothing can extend, nor would use Void.
    return Void.class;
  }