package au.gov.amsa.geo.model;
   
   import java.text.SimpleDateFormat;
   
   import au.gov.amsa.risky.format.HasPosition;
   import au.gov.amsa.util.navigation.Position;
   
   import com.google.common.base.Optional;
   
  public class Util {
      public static Position toPos(HasPosition a) {
          return new Position(a.lat(), a.lon());
      }
  
      public static double greatCircleDistanceNm(HasPosition p1, HasPosition p2) {
          return toPos(p1).getDistanceToKm(toPos(p2)) / 1.852;
      }
  
      public static String formatDate(Optional<Long> time) {
          if (time.isPresent()) {
              SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
              return sdf.format(time.get());
          } else
              return "";
      }
  }