package org.kuali.spring.util.event;

 import org.kuali.spring.util.PropertyLogger;

 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);

     PropertyLogger plogger = new PropertyLogger();

     @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 {

             String name = event.getPropertyValue().getName();

             String oldValue = plogger.getLogEntry(name, event.getOldValue() + "");

             String newValue = plogger.getLogEntry(name, event.getNewValue() + "");

             logger.info("Property '" + name + "' updated [{}]->[{}]", oldValue, newValue);

         }

     }

     public PropertyLogger getPlogger() {

         return plogger;

     }

     public void setPlogger(PropertyLogger plogger) {

         this.plogger = plogger;

     }

 }