List executionPeriods = readAllExecutionPeriod();
Collection executionPeriods = readAll(ExecutionPeriod.class);
    public List readNotClosedExecutionPeriods() throws ExcepcaoPersistencia {        List executionPeriods = readAllExecutionPeriod();         List executionPeriodsAux = new ArrayList();                for (Iterator iter = executionPeriods.iterator(); iter.hasNext();) {            ExecutionPeriod element = (ExecutionPeriod) iter.next();            if(!element.getState().equals(PeriodState.CLOSED))                executionPeriodsAux.add(element);        }             return executionPeriodsAux;    }