DateTimeUtils.java 文件源码

public static long parseYearMonthInterval(String value, IntervalField startField, Optional<IntervalField> endField)
{
    IntervalField end = endField.orElse(startField);

    if (startField == IntervalField.YEAR && end == IntervalField.MONTH) {
        PeriodFormatter periodFormatter = INTERVAL_YEAR_MONTH_FORMATTER;
        return parsePeriodMonths(value, periodFormatter, startField, end);
    }
    if (startField == IntervalField.YEAR && end == IntervalField.YEAR) {
        return parsePeriodMonths(value, INTERVAL_YEAR_FORMATTER, startField, end);
    }

    if (startField == IntervalField.MONTH && end == IntervalField.MONTH) {
        return parsePeriodMonths(value, INTERVAL_MONTH_FORMATTER, startField, end);
    }

    throw new IllegalArgumentException("Invalid year month interval qualifier: " + startField + " to " + end);
}