code: public Object execute(final Object value, final CsvContext context) {
  		validateInputNotNull(value, context);
  		if( !(value instanceof Period) ) {
  			throw new SuperCsvCellProcessorException(Period.class, value, context, this);
  		}
  		final Period period = (Period) value;
  		final String result = period.toString();
  
  		return next.execute(result, context);
  	}
docs: {@inheritDoc}
  
  @throws SuperCsvCellProcessorException if value is null or not a Period