public final String getValue() {
        if (periods != null && !(periods.isEmpty() && periods.isUnmodifiable())) {
            return Strings.valueOf(getPeriods());
        }
        return super.getValue();
    }
public final String getValue ( ) { if ( periods != null && ! ( periods . isEmpty ( ) && periods . isUnmodifiable ( ) ) ) { return Strings . valueOf ( getPeriods ( ) ) ; } return super . getValue ( ) ; }
{@inheritDoc}