package org.kuali.spring.util.event;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import org.springframework.util.ObjectUtils;

 public class DefaultVisitListener implements VisitListener {

         final Logger logger = LoggerFactory.getLogger(DefaultVisitListener.class);

         @Override

         public void valueResolved(ValueResolutionEvent event) {

                 if (ObjectUtils.nullSafeEquals(event.getOldValue(), event.getNewValue())) {

                         // Nothing changed

                         logger.trace("Resolved value is the same as the original value");

                 } else {

                         // The property was updated

                         logger.trace("Value updated: [{}]->[{}]", event.getOldValue(), event.getNewValue());

                 }

         }

         @Override

         public void beforeVisit(BeanVisitEvent event) {

                 logger.info("Visiting {}", event.getBeanDefinition());

         }

         @Override

         public void afterVisit(BeanVisitEvent event) {

                 logger.trace("Visit completed. {}", event.getBeanDefinition());

         }

         @Override

         public void beforeVisit(PropertyValueVisitEvent event) {

                 logger.trace("Visiting {}", event.getPropertyValue());

         }

         @Override

         public void afterVisit(PropertyValueVisitEvent event) {

                 if (ObjectUtils.nullSafeEquals(event.getOldValue(), event.getNewValue())) {

                         logger.trace("Value for property '{}' was left unchanged", event.getPropertyValue().getName());

                 } else {

                         logger.info(event.getPropertyValue() + " updated [{}]->[{}]", event.getOldValue(), event.getNewValue());

                 }

         }

 }