@Override
public void exitUncertainDate(UncertainDateContext ctx) {
if (ctx.exception != null) return;
Date latestDate = (Date) stack.pop();
Date earliestDate = (Date) stack.pop();
int earliestInterval =
DateUtils.getCircaIntervalYears(earliestDate.getYear(), earliestDate.getEra());
int latestInterval = DateUtils.getCircaIntervalYears(latestDate.getYear(), latestDate.getEra());
// Express the circa interval as a qualifier.
// stack.push(earliestDate.withQualifier(QualifierType.MINUS, earliestInterval,
// QualifierUnit.YEARS));
// stack.push(latestDate.withQualifier(QualifierType.PLUS, latestInterval,
// QualifierUnit.YEARS));
// OR:
// Express the circa interval as an offset calculated into the year.
DateUtils.subtractYears(earliestDate, earliestInterval);
DateUtils.addYears(latestDate, latestInterval);
stack.push(earliestDate);
stack.push(latestDate);
}
