/**
 *  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;
}