/**
* The method checks the object to <code>null</code> completeness of all positions are empty
* positions are not allowed
*
* @param flight - Flight object being checked
* @return - false, if everything checks out correctly; true - if the data is invalid
*/
private static boolean checkEmpty(Flight flight) {
return flight == null
|| flight.getDate() == null
|| flight.getFrom() == null
|| flight.getTo() == null
|| flight.getPlane() == null;
}
/**
* The method checks the place of departure and place of arrival, they will not be the same
*
* @param flight - Flight object being checked
* @return - false, if everything checks out correctly; true - if the data is invalid
*/
private static boolean checkEntry(Flight flight) {
return flight.getFrom().equals(flight.getTo());
}