private long truncateMillisPeriod(final long t) {
// toStandardDuration assumes days are always 24h, and hours are always 60 minutes,
// which may not always be the case, e.g if there are daylight saving changes.
if (chronology.days().isPrecise() && chronology.hours().isPrecise()) {
final long millis = period.toStandardDuration().getMillis();
long offset = t % millis - origin % millis;
if (offset < 0) {
offset += millis;
}
return t - offset;
} else {
throw new UnsupportedOperationException(
"Period cannot be converted to milliseconds as some fields mays vary in length with chronology "
+ chronology.toString());
}
}
@Override
public long truncate(long t) {
if (isCompound) {
try {
return truncateMillisPeriod(t);
} catch (UnsupportedOperationException e) {
return truncateCompoundPeriod(t);
}
}
final int years = period.getYears();
if (years > 0) {
if (years > 1 || hasOrigin) {
int y = chronology.years().getDifference(t, origin);
y -= y % years;
long tt = chronology.years().add(origin, y);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.years().add(tt, -years);
else t = tt;
return t;
} else {
return chronology.year().roundFloor(t);
}
}
final int months = period.getMonths();
if (months > 0) {
if (months > 1 || hasOrigin) {
int m = chronology.months().getDifference(t, origin);
m -= m % months;
long tt = chronology.months().add(origin, m);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.months().add(tt, -months);
else t = tt;
return t;
} else {
return chronology.monthOfYear().roundFloor(t);
}
}
final int weeks = period.getWeeks();
if (weeks > 0) {
if (weeks > 1 || hasOrigin) {
// align on multiples from origin
int w = chronology.weeks().getDifference(t, origin);
w -= w % weeks;
long tt = chronology.weeks().add(origin, w);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.weeks().add(tt, -weeks);
else t = tt;
return t;
} else {
t = chronology.dayOfWeek().roundFloor(t);
// default to Monday as beginning of the week
return chronology.dayOfWeek().set(t, 1);
}
}
final int days = period.getDays();
if (days > 0) {
if (days > 1 || hasOrigin) {
// align on multiples from origin
int d = chronology.days().getDifference(t, origin);
d -= d % days;
long tt = chronology.days().add(origin, d);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.days().add(tt, -days);
else t = tt;
return t;
} else {
t = chronology.hourOfDay().roundFloor(t);
return chronology.hourOfDay().set(t, 0);
}
}
final int hours = period.getHours();
if (hours > 0) {
if (hours > 1 || hasOrigin) {
// align on multiples from origin
long h = chronology.hours().getDifferenceAsLong(t, origin);
h -= h % hours;
long tt = chronology.hours().add(origin, h);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.hours().add(tt, -hours);
else t = tt;
return t;
} else {
t = chronology.minuteOfHour().roundFloor(t);
return chronology.minuteOfHour().set(t, 0);
}
}
final int minutes = period.getMinutes();
if (minutes > 0) {
// align on multiples from origin
if (minutes > 1 || hasOrigin) {
long m = chronology.minutes().getDifferenceAsLong(t, origin);
m -= m % minutes;
long tt = chronology.minutes().add(origin, m);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.minutes().add(tt, -minutes);
else t = tt;
return t;
} else {
t = chronology.secondOfMinute().roundFloor(t);
return chronology.secondOfMinute().set(t, 0);
}
}
final int seconds = period.getSeconds();
if (seconds > 0) {
// align on multiples from origin
if (seconds > 1 || hasOrigin) {
long s = chronology.seconds().getDifferenceAsLong(t, origin);
s -= s % seconds;
long tt = chronology.seconds().add(origin, s);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.seconds().add(tt, -seconds);
else t = tt;
return t;
} else {
return chronology.millisOfSecond().set(t, 0);
}
}
final int millis = period.getMillis();
if (millis > 0) {
if (millis > 1) {
long ms = chronology.millis().getDifferenceAsLong(t, origin);
ms -= ms % millis;
long tt = chronology.millis().add(origin, ms);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) t = chronology.millis().add(tt, -millis);
else t = tt;
return t;
} else {
return t;
}
}
return t;
}
