code: private void processField(Object target, AnnotationHandler handler, Field field, boolean before) {
  		for (Annotation annotation : field.getAnnotations()) {
  			if (handler.support(annotation)) {
  				if (before) {
  					handler.before(target, field);
  				}
  				else {
  					handler.after(target, field);
  				}
  			}
  		}
  	}
docs: Process field for given handler.
  
  @param target Target class (i.e tested class).
  @param handler Handler.
  @param field Field.
  @param before Flag to know if handler has to run "before" phase or "after" phase.