import com.github.mongobee.changeset.ChangeLog; //导入依赖的package包/类
@Override
public int compare(Class<?> o1, Class<?> o2) {
  ChangeLog c1 = o1.getAnnotation(ChangeLog.class);
  ChangeLog c2 = o2.getAnnotation(ChangeLog.class);

  String val1 = !(hasText(c1.order())) ? o1.getCanonicalName() : c1.order();
  String val2 = !(hasText(c2.order())) ? o2.getCanonicalName() : c2.order();

  if (val1 == null && val2 == null){
    return 0;
  } else if (val1 == null) {
    return -1;
  } else if (val2 == null) {
    return 1;
  }

  return val1.compareTo(val2);
}
 

import com.github.mongobee.changeset.ChangeLog; //导入依赖的package包/类
public List<Class<?>> fetchChangeLogs(){
  Reflections reflections = new Reflections(changeLogsBasePackage);
  Set<Class<?>> changeLogs = reflections.getTypesAnnotatedWith(ChangeLog.class); // TODO remove dependency, do own method
  List<Class<?>> filteredChangeLogs = (List<Class<?>>) filterByActiveProfiles(changeLogs);

  Collections.sort(filteredChangeLogs, new ChangeLogComparator());

  return filteredChangeLogs;
}