Util.java

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 "";
    }
}