code: public static Boolean getAnnotationAttributeAsBoolean(ModelWithAnnotation model, Class<? extends Annotation> annotation, AnnotationAttributeType attribute, Boolean defaultValue) {
  		return getAnnotationAttribute(model, annotation, attribute, defaultValue, new OnAnnotationAttributeListener<Boolean>() {
  
  			@Override
  			public Boolean onFound(String value) {
  				return Boolean.valueOf(value);
  			}
  		});
  	}
docs: Gets the annotation attribute as boolean.
  
  @param model the model
  @param annotation the annotation
  @param attribute the attribute
  @param defaultValue the default value
  @return the annotation attribute as boolean