CheckOverLapsDates

/**
 *  Assuming that date == null, means no end. For example endDate null, never end.
 * @param newStartDate
 * @param newEndDate
 * @param startDate
 * @param endDate
 */
public boolean checkOverLapsDates(Date newStartDate, Date newEndDate, Date startDate, Date endDate){
    boolean canAdd = false;

    if ((newEndDate == null && endDate) == null)){
        continue;
    }

    //newStartDate shouldn't be between another existent date
    if (Data.isCompresaTra(startDate, newStartDate,
            endDate)) {
        continue;
    } else if (newEndDate != null
            && Data.isCompresaTra(startDate, newEndDate,
                    endDate)) {
        //newEndDate shouldn't be between existent date
        continue;
    } else if (endDate != null
            && Data.isCompresaTra(newStartDate, endDate,
                    newEndDate)) {
        //endDate shouldn't be between the newDates
        continue;
    } else {
        canAdd = true;
    }

    return canAdd;
}