code: public static String extractAsClassName(Element item, Class<? extends Annotation> annotationClass, AnnotationAttributeType attributeName) {
  		final Elements elementUtils=BindDataSourceSubProcessor.elementUtils;
  		final One<String> result = new One<String>();
  
  		extractString(elementUtils, item, annotationClass, attributeName, new OnAttributeFoundListener() {
  
  			@Override
  			public void onFound(String value) {
  				result.value0 = AnnotationUtility.extractAsArrayOfClassName(value).get(0);
  			}
  		});
  
  		return result.value0;
  	}
docs: Extract from an annotation of a method the attribute value specified.
  
  @param item the item
  @param annotationClass the annotation class
  @param attributeName the attribute name
  @return attribute value extracted as class typeName