/**
* Returns a day count for the specified years, months and days. All values must be specified in
* their internal representation (undefined values are supported, too). Algorithm is derived from
* J R Stockton (http://www.merlyn.demon.co.uk/daycount.htm).
*
* @param year year
* @param month month
* @param day days
* @return days
*/
private static BigDecimal days(final long year, final int month, final int day) {
final long y = year - (month < 2 ? 1 : 0);
final int m = month + (month < 2 ? 13 : 1);
final int d = day + 1;
return BD365
.multiply(BigDecimal.valueOf(y))
.add(BigDecimal.valueOf(y / 4 - y / 100 + y / 400 - 92 + d + (153 * m - 2) / 5));
}
/**
* Initializes the dayTime component.
*
* @param vl value
* @param mt matcher
* @param p first matching position
* @param ii input info
* @throws QueryException query exception
*/
void dayTime(final byte[] vl, final Matcher mt, final int p, final InputInfo ii)
throws QueryException {
final long d = mt.group(p) != null ? toLong(mt.group(p + 1), true, ii) : 0;
final long h = mt.group(p + 3) != null ? toLong(mt.group(p + 4), true, ii) : 0;
final long m = mt.group(p + 5) != null ? toLong(mt.group(p + 6), true, ii) : 0;
final BigDecimal s =
mt.group(p + 7) != null ? toDecimal(mt.group(p + 8), true, ii) : BigDecimal.ZERO;
sec =
s.add(BigDecimal.valueOf(d).multiply(DAYSECONDS))
.add(BigDecimal.valueOf(h).multiply(BD3600))
.add(BigDecimal.valueOf(m).multiply(BD60));
if (!mt.group(1).isEmpty()) sec = sec.negate();
final double v = sec.doubleValue();
if (v <= Long.MIN_VALUE || v >= Long.MAX_VALUE) throw DURRANGE_X_X.get(ii, type, vl);
}
/**
* Returns the date in seconds.
*
* @return seconds
*/
final BigDecimal seconds() {
int z = tz;
if (z == Short.MAX_VALUE) {
// [CG] XQuery, DateTime: may be removed
final long n = System.currentTimeMillis();
z = Calendar.getInstance().getTimeZone().getOffset(n) / 60000;
}
return (sec == null ? BigDecimal.ZERO : sec)
.add(BigDecimal.valueOf(Math.max(0, hou) * 3600 + Math.max(0, min) * 60 - z * 60));
}
/**
* Converts a day count into year, month and day components. Algorithm is derived from J R
* Stockton (http://www.merlyn.demon.co.uk/daycount.htm).
*
* @param days day count
* @return result array
*/
private static long[] ymd(final BigDecimal days) {
BigDecimal d = days;
BigDecimal t =
d.add(BD36525).multiply(BD4).divideToIntegralValue(BD146097).subtract(BigDecimal.ONE);
BigDecimal y = BD100.multiply(t);
d = d.subtract(BD36524.multiply(t).add(t.divideToIntegralValue(BD4)));
t = d.add(BD366).multiply(BD4).divideToIntegralValue(BD1461).subtract(BigDecimal.ONE);
y = y.add(t);
d = d.subtract(BD365.multiply(t).add(t.divideToIntegralValue(BD4)));
final BigDecimal m = BD5.multiply(d).add(BD2).divideToIntegralValue(BD153);
d = d.subtract(BD153.multiply(m).add(BD2).divideToIntegralValue(BD5));
long mm = m.longValue();
if (mm > 9) {
mm -= 12;
y = y.add(BigDecimal.ONE);
}
return new long[] {y.subtract(BigDecimal.valueOf(ADD_NEG)).longValue(), mm + 2, d.longValue()};
}
/**
* Adjusts the timezone.
*
* @param zone timezone
* @param spec indicates if zone has been specified (may be {@code null})
* @param ii input info
* @throws QueryException query exception
*/
void tz(final DTDur zone, final boolean spec, final InputInfo ii) throws QueryException {
final short t;
if (spec && zone == null) {
t = Short.MAX_VALUE;
} else {
if (zone == null) {
final Calendar c = Calendar.getInstance();
t = (short) ((c.get(Calendar.ZONE_OFFSET) + c.get(Calendar.DST_OFFSET)) / 60000);
} else {
t = (short) (zone.min() + zone.hou() * 60);
if (zone.sec().signum() != 0) throw ZONESEC_X.get(ii, zone);
if (Math.abs(t) > 60 * 14 || zone.day() != 0) throw INVALZONE_X.get(ii, zone);
}
// change time if two competing time zones exist
if (tz != Short.MAX_VALUE) add(BigDecimal.valueOf(60L * (t - tz)));
}
tz = t;
}
/**
* Adds the specified dayTime duration.
*
* @param add value to be added
*/
private void add(final BigDecimal add) {
// normalized modulo: sc % 60 vs. (-sc + sc % 60 + 60 + sc) % 60
final BigDecimal sc = sec().add(add);
sec =
sc.signum() >= 0
? sc.remainder(BD60)
: sc.negate().add(sc.remainder(BD60)).add(BD60).add(sc).remainder(BD60);
final long mn = Math.max(min(), 0) + div(sc.longValue(), 60);
min = (byte) mod(mn, 60);
final long ho = Math.max(hou, 0) + div(mn, 60);
hou = (byte) mod(ho, 24);
final long da = div(ho, 24);
final long[] ymd = ymd(days().add(BigDecimal.valueOf(da)));
yea = ymd[0];
mon = (byte) ymd[1];
day = (byte) ymd[2];
}