public  void addInterpolator(Annotation annotation,
    Validator validator) 
{
		DefaultMessageInterpolator interpolator = new DefaultMessageInterpolator();
		interpolator.initialize(messageBundle, defaultMessageBundle );
		interpolator.initialize( annotation, null );
		interpolators.put( validator, interpolator );
}

 public String getAnnotationMessage(Validator validator) 
{
		DefaultMessageInterpolator defaultMessageInterpolator = interpolators.get( validator );
		String message = defaultMessageInterpolator != null ? defaultMessageInterpolator.getAnnotationMessage() : null;
		if (message == null) throw new AssertionFailure("Validator not registred to the messageInterceptorAggregator");
		return message;
}

 public  void initialize(ResourceBundle messageBundle,
    ResourceBundle defaultMessageBundle) 
{
	//not an interface method
		this.messageBundle = messageBundle;
		this.defaultMessageBundle = defaultMessageBundle;
		//useful when we deserialize
		for ( DefaultMessageInterpolator interpolator : interpolators.values() ) {
			interpolator.initialize( messageBundle, defaultMessageBundle );
		}
}

 public String interpolate(String message,
    Validator validator,
    MessageInterpolator defaultInterpolator) 
{
		DefaultMessageInterpolator defaultMessageInterpolator = interpolators.get( validator );
		if (defaultMessageInterpolator == null) {
			return message;
		}
		else {
			return defaultMessageInterpolator.interpolate( message, validator, defaultInterpolator );
		}
}