/**
* Extract time-zone information from a zoneinfo (Olson database) ID and saves them in the
* TimeZoneHelper fields.
*
* @param id the time zone ID according to the zoneinfo (Olson) database
* @param from the start of the relevant time interval for the generation of transitions (an
* istant expressed as a long)
* @param to the end of the relevant time interval for the generation of transitions (an istant
* expressed as a long)
*/
protected void processID(String id, long from, long to) {
DateTimeZone tz = DateTimeZone.forID(id);
if (name == null) { // The name could have been set already using TZID
// and in this case it is important not to change it
name = id; // The Olson ID is perfect as a unique name
}
basicOffset = tz.getStandardOffset(from);
transitions.clear();
if (!tz.isFixed()) {
long oldFrom = from;
from = fixFrom(tz, basicOffset, oldFrom);
// @todo Consider case when to go beyond last transition (cycle
// could become endless)
while (tz.getStandardOffset(to) != tz.getOffset(to)) {
to = tz.nextTransition(to);
}
while ((from <= to) && (oldFrom != from)) {
transitions.add(new TimeZoneTransition(tz.getOffset(from), from, id));
oldFrom = from;
from = tz.nextTransition(oldFrom);
}
}
}
/**
* To be even more nasty, go to a transition in the selected time zone. In one third of the cases
* stay there, otherwise go half a unit back or forth
*/
private static long nastyDate(long initialDate, DateTimeZone timezone, long unitMillis) {
long date = timezone.nextTransition(initialDate);
if (randomBoolean()) {
return date + (randomLong() % unitMillis); // positive and negative offset possible
} else {
return date;
}
}
protected long fixFrom(DateTimeZone tz, int standardOffset, long from) {
if (standardOffset != tz.getOffset(from)) { // NB: this must NOT be
// a call to getBasicOffset(), because that method may be
// overriden by the cached implementation(s) of this class.
do {
from = tz.previousTransition(from) + 1;
} while ((from != 0) && (standardOffset == tz.getOffset(from)));
} else {
from = tz.nextTransition(from);
}
return from;
}
private boolean matchesID(String idToCheck) {
DateTimeZone tz;
try {
tz = DateTimeZone.forID(idToCheck);
} catch (IllegalArgumentException e) { // the ID is not recognized
return false;
}
if (getTransitions().size() == 0) { // No transitions
if (tz.getStandardOffset(REFERENCE_TIME) != basicOffset) {
return false; // Offsets don't match: wrong guess
}
if (tz.isFixed() || (REFERENCE_TIME == tz.nextTransition(REFERENCE_TIME))) {
return true; // A right fixed or currently-fixed time zone
// has been found
}
return false; // Wrong guess
}
long t = getTransitions().get(0).getTime() - 1;
if (tz.getStandardOffset(t) != basicOffset) {
return false; // Wrong guess
}
for (TimeZoneTransition transition : getTransitions()) {
t = tz.nextTransition(t);
if (!isClose(t, transition.getTime())) {
return false; // Wrong guess
}
if (tz.getOffset(t) != transition.getOffset()) {
return false; // Wrong guess
}
}
return true; // A right non-fixed time zone has been found
}
/** @return false if error. */
static boolean test(String id, DateTimeZone tz) {
if (!id.equals(tz.getID())) {
return true;
}
// Test to ensure that reported transitions are not duplicated.
long millis = ISOChronology.getInstanceUTC().year().set(0, 1850);
long end = ISOChronology.getInstanceUTC().year().set(0, 2050);
int offset = tz.getOffset(millis);
String key = tz.getNameKey(millis);
List<Long> transitions = new ArrayList<Long>();
while (true) {
long next = tz.nextTransition(millis);
if (next == millis || next > end) {
break;
}
millis = next;
int nextOffset = tz.getOffset(millis);
String nextKey = tz.getNameKey(millis);
if (offset == nextOffset && key.equals(nextKey)) {
System.out.println(
"*d* Error in "
+ tz.getID()
+ " "
+ new DateTime(millis, ISOChronology.getInstanceUTC()));
return false;
}
if (nextKey == null || (nextKey.length() < 3 && !"??".equals(nextKey))) {
System.out.println(
"*s* Error in "
+ tz.getID()
+ " "
+ new DateTime(millis, ISOChronology.getInstanceUTC())
+ ", nameKey="
+ nextKey);
return false;
}
transitions.add(Long.valueOf(millis));
offset = nextOffset;
key = nextKey;
}
// Now verify that reverse transitions match up.
millis = ISOChronology.getInstanceUTC().year().set(0, 2050);
end = ISOChronology.getInstanceUTC().year().set(0, 1850);
for (int i = transitions.size(); --i >= 0; ) {
long prev = tz.previousTransition(millis);
if (prev == millis || prev < end) {
break;
}
millis = prev;
long trans = transitions.get(i).longValue();
if (trans - 1 != millis) {
System.out.println(
"*r* Error in "
+ tz.getID()
+ " "
+ new DateTime(millis, ISOChronology.getInstanceUTC())
+ " != "
+ new DateTime(trans - 1, ISOChronology.getInstanceUTC()));
return false;
}
}
return true;
}
