java.time.zone.ZoneOffsetTransition.getOffsetBefore()方法的使用及代码示例
本文整理了Java中java.time.zone.ZoneOffsetTransition.getOffsetBefore()方法的一些代码示例，展示了ZoneOffsetTransition.getOffsetBefore()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ZoneOffsetTransition.getOffsetBefore()方法的具体详情如下：
包路径：java.time.zone.ZoneOffsetTransition
类名称：ZoneOffsetTransition
方法名：getOffsetBefore
ZoneOffsetTransition.getOffsetBefore介绍
[英]Gets the offset before the transition.
This is the offset in use before the instant of the transition.
[中]获取转换前的偏移量。
这是过渡瞬间之前使用的偏移量。
代码示例
代码示例来源：origin: com.github.seratch/java-time-backport
@Override
public ZoneOffset getOffset(LocalDateTime localDateTime) {
Object info = getOffsetInfo(localDateTime);
if (info instanceof ZoneOffsetTransition) {
return ((ZoneOffsetTransition) info).getOffsetBefore();
}
return (ZoneOffset) info;
}代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Gets the valid offsets during this transition.
* <p>
* A gap will return an empty list, while an overlap will return both offsets.
*
* @return the list of valid offsets
*/
List<ZoneOffset> getValidOffsets() {
if (isGap()) {
return Collections.emptyList();
}
return Arrays.asList(getOffsetBefore(), getOffsetAfter());
}代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Does this transition represent a gap in the local time-line.
* <p>
* Gaps occur where there are local date-times that simply do not not exist.
* An example would be when the offset changes from {@code +01:00} to {@code +02:00}.
* This might be described as 'the clocks will move forward one hour tonight at 1am'.
*
* @return true if this transition is a gap, false if it is an overlap
*/
public boolean isGap() {
return getOffsetAfter().getTotalSeconds() > getOffsetBefore().getTotalSeconds();
}代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Does this transition represent a gap in the local time-line.
* <p>
* Overlaps occur where there are local date-times that exist twice.
* An example would be when the offset changes from {@code +02:00} to {@code +01:00}.
* This might be described as 'the clocks will move back one hour tonight at 2am'.
*
* @return true if this transition is an overlap, false if it is a gap
*/
public boolean isOverlap() {
return getOffsetAfter().getTotalSeconds() < getOffsetBefore().getTotalSeconds();
}代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Gets the duration of the transition in seconds.
*
* @return the duration in seconds
*/
private int getDurationSeconds() {
return getOffsetAfter().getTotalSeconds() - getOffsetBefore().getTotalSeconds();
}代码示例来源：origin: com.github.seratch/java-time-backport
@Override
public ZoneOffset getOffset(Instant instant) {
long epochSec = instant.getEpochSecond();
// check if using last rules
if (lastRules.length > 0 &&
epochSec > savingsInstantTransitions[savingsInstantTransitions.length - 1]) {
int year = findYear(epochSec, wallOffsets[wallOffsets.length - 1]);
ZoneOffsetTransition[] transArray = findTransitionArray(year);
ZoneOffsetTransition trans = null;
for (int i = 0; i < transArray.length; i++) {
trans = transArray[i];
if (epochSec < trans.toEpochSecond()) {
return trans.getOffsetBefore();
}
}
return trans.getOffsetAfter();
}
// using historic rules
int index = Arrays.binarySearch(savingsInstantTransitions, epochSec);
if (index < 0) {
// switch negative insert position to start of matched range
index = -index - 2;
}
return wallOffsets[index + 1];
}代码示例来源：origin: com.addthis/cronus
/**
* If there is no daylight savings time transition
* the ignore any effects of daylight savings and return
* the local output time.
*
* If there is a daylight savings time overlap transition
* (the clocks are set back) then select the time zone
* offset from before the transition.
*
* If there is a daylight saving time gap transition
* (the clocks are set forward) then we cannot use the local
* output time because it is not a legal time value.
* Move the event to the end of the transition.
*/
private ZonedDateTime outputAdjustDaylightSavings(LocalDateTime output, ZoneId zoneId) {
if (output == null) {
return null;
}
ZoneRules zoneRules = zoneId.getRules();
ZoneOffsetTransition transition = zoneRules.getTransition(output);
if (transition == null) {
return ZonedDateTime.of(output, zoneId);
} else if (transition.isOverlap()) {
return ZonedDateTime.ofInstant(output, transition.getOffsetBefore(), zoneId);
} else {
return ZonedDateTime.ofInstant(transition.getDateTimeAfter(), transition.getOffsetAfter(), zoneId);
}
}代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Checks if the specified offset is valid during this transition.
* <p>
* This checks to see if the given offset will be valid at some point in the transition.
* A gap will always return false.
* An overlap will return true if the offset is either the before or after offset.
*
* @param offset the offset to check, null returns false
* @return true if the offset is valid during the transition
*/
public boolean isValidOffset(ZoneOffset offset) {
return isGap() ? false : (getOffsetBefore().equals(offset) || getOffsetAfter().equals(offset));
}代码示例来源：origin: ical4j/ical4j
private static void addTransitions(ZoneId zoneId, VTimeZone result, int rawTimeZoneOffsetInSeconds) throws ParseException {
Map<ZoneOffsetKey, Set<ZoneOffsetTransition>> zoneTransitionsByOffsets = new HashMap<ZoneOffsetKey, Set<ZoneOffsetTransition>>();
for (ZoneOffsetTransition zoneTransitionRule : zoneId.getRules().getTransitions()) {
ZoneOffsetKey offfsetKey = ZoneOffsetKey.of(zoneTransitionRule.getOffsetBefore(), zoneTransitionRule.getOffsetAfter());
Set<ZoneOffsetTransition> transitionRulesForOffset = zoneTransitionsByOffsets.computeIfAbsent(offfsetKey, k -> new HashSet<ZoneOffsetTransition>(1));
transitionRulesForOffset.add(zoneTransitionRule);
}
for (Map.Entry<ZoneOffsetKey, Set<ZoneOffsetTransition>> e : zoneTransitionsByOffsets.entrySet()) {
Observance observance = (e.getKey().offsetAfter.getTotalSeconds() > rawTimeZoneOffsetInSeconds) ? new Daylight() : new Standard();
LocalDateTime start = Collections.min(e.getValue()).getDateTimeBefore();
DtStart dtStart = new DtStart(start.format(DateTimeFormatter.ofPattern(DATE_TIME_TPL)));
TzOffsetFrom offsetFrom = new TzOffsetFrom(e.getKey().offsetBefore);
TzOffsetTo offsetTo = new TzOffsetTo(e.getKey().offsetAfter);
observance.getProperties().add(dtStart);
observance.getProperties().add(offsetFrom);
observance.getProperties().add(offsetTo);
for (ZoneOffsetTransition transition : e.getValue()) {
RDate rDate = new RDate(new ParameterList(), transition.getDateTimeBefore().format(DateTimeFormatter.ofPattern(DATE_TIME_TPL)));
observance.getProperties().add(rDate);
}
result.getObservances().add(observance);
}
}代码示例来源：origin: org.mnode.ical4j/ical4j
private static void addTransitions(ZoneId zoneId, VTimeZone result, int rawTimeZoneOffsetInSeconds) throws ParseException {
Map<ZoneOffsetKey, Set<ZoneOffsetTransition>> zoneTransitionsByOffsets = new HashMap<ZoneOffsetKey, Set<ZoneOffsetTransition>>();
for (ZoneOffsetTransition zoneTransitionRule : zoneId.getRules().getTransitions()) {
ZoneOffsetKey offfsetKey = ZoneOffsetKey.of(zoneTransitionRule.getOffsetBefore(), zoneTransitionRule.getOffsetAfter());
Set<ZoneOffsetTransition> transitionRulesForOffset = zoneTransitionsByOffsets.computeIfAbsent(offfsetKey, k -> new HashSet<ZoneOffsetTransition>(1));
transitionRulesForOffset.add(zoneTransitionRule);
}
for (Map.Entry<ZoneOffsetKey, Set<ZoneOffsetTransition>> e : zoneTransitionsByOffsets.entrySet()) {
Observance observance = (e.getKey().offsetAfter.getTotalSeconds() > rawTimeZoneOffsetInSeconds) ? new Daylight() : new Standard();
LocalDateTime start = Collections.min(e.getValue()).getDateTimeBefore();
DtStart dtStart = new DtStart(start.format(DateTimeFormatter.ofPattern(DATE_TIME_TPL)));
TzOffsetFrom offsetFrom = new TzOffsetFrom(e.getKey().offsetBefore);
TzOffsetTo offsetTo = new TzOffsetTo(e.getKey().offsetAfter);
observance.getProperties().add(dtStart);
observance.getProperties().add(offsetFrom);
observance.getProperties().add(offsetTo);
for (ZoneOffsetTransition transition : e.getValue()) {
RDate rDate = new RDate(new ParameterList(), transition.getDateTimeBefore().format(DateTimeFormatter.ofPattern(DATE_TIME_TPL)));
observance.getProperties().add(rDate);
}
result.getObservances().add(observance);
}
}代码示例来源：origin: com.github.seratch/java-time-backport
@Override
public ChronoZonedDateTime<D> withEarlierOffsetAtOverlap() {
ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
if (trans != null && trans.isOverlap()) {
ZoneOffset earlierOffset = trans.getOffsetBefore();
if (earlierOffset.equals(offset) == false) {
return new ChronoZonedDateTimeImpl<D>(dateTime, earlierOffset, zone);
}
}
return this;
}代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Finds the offset info for a local date-time and transition.
*
* @param dt the date-time, not null
* @param trans the transition, not null
* @return the offset info, not null
*/
private Object findOffsetInfo(LocalDateTime dt, ZoneOffsetTransition trans) {
LocalDateTime localTransition = trans.getDateTimeBefore();
if (trans.isGap()) {
if (dt.isBefore(localTransition)) {
return trans.getOffsetBefore();
}
if (dt.isBefore(trans.getDateTimeAfter())) {
return trans;
} else {
return trans.getOffsetAfter();
}
} else {
if (dt.isBefore(localTransition) == false) {
return trans.getOffsetAfter();
}
if (dt.isBefore(trans.getDateTimeAfter())) {
return trans.getOffsetBefore();
} else {
return trans;
}
}
}代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Converts this to a transition rule.
*
* @param standardOffset the active standard offset, not null
* @param savingsBeforeSecs the active savings before the transition in seconds
* @return the transition, not null
*/
ZoneOffsetTransitionRule toTransitionRule(ZoneOffset standardOffset, int savingsBeforeSecs) {
// optimize stored format
if (dayOfMonthIndicator < 0) {
if (month != Month.FEBRUARY) {
dayOfMonthIndicator = month.maxLength() - 6;
}
}
if (timeEndOfDay && dayOfMonthIndicator > 0 && (dayOfMonthIndicator == 28 && month == Month.FEBRUARY) == false) {
LocalDate date = LocalDate.of(2004, month, dayOfMonthIndicator).plusDays(1); // leap-year
month = date.getMonth();
dayOfMonthIndicator = date.getDayOfMonth();
if (dayOfWeek != null) {
dayOfWeek = dayOfWeek.plus(1);
}
timeEndOfDay = false;
}
// build rule
ZoneOffsetTransition trans = toTransition(standardOffset, savingsBeforeSecs);
return new ZoneOffsetTransitionRule(
month, dayOfMonthIndicator, dayOfWeek, time, timeEndOfDay, timeDefinition,
standardOffset, trans.getOffsetBefore(), trans.getOffsetAfter());
}代码示例来源：origin: com.github.seratch/java-time-backport
for (ZoneOffsetTransition trans : transArray) {
info = findOffsetInfo(dt, trans);
if (info instanceof ZoneOffsetTransition || info.equals(trans.getOffsetBefore())) {
return info;代码示例来源：origin: com.github.seratch/java-time-backport
/**
* Returns a copy of this date-time changing the zone offset to the
* earlier of the two valid offsets at a local time-line overlap.
* <p>
* This method only has any effect when the local time-line overlaps, such as
* at an autumn daylight savings cutover. In this scenario, there are two
* valid offsets for the local date-time. Calling this method will return
* a zoned date-time with the earlier of the two selected.
* <p>
* If this method is called when it is not an overlap, {@code this}
* is returned.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return a {@code ZonedDateTime} based on this date-time with the earlier offset, not null
*/
@Override
public ZonedDateTime withEarlierOffsetAtOverlap() {
ZoneOffsetTransition trans = getZone().getRules().getTransition(dateTime);
if (trans != null && trans.isOverlap()) {
ZoneOffset earlierOffset = trans.getOffsetBefore();
if (earlierOffset.equals(offset) == false) {
return new ZonedDateTime(dateTime, earlierOffset, zone);
}
}
return this;
}代码示例来源：origin: com.addthis/cronus
} else if (transition.isGap() || zoneOffset.equals(transition.getOffsetAfter())) {
return ZonedDateTime.ofInstant(transition.getDateTimeBefore().minusMinutes(1),
transition.getOffsetBefore(), zoneId);
} else {
return input;代码示例来源：origin: net.time4j/time4j-olson
Instant instant = zot.getInstant();
long posixTime = instant.getEpochSecond();
int previousOffset = zot.getOffsetBefore().getTotalSeconds();
int totalOffset = zot.getOffsetAfter().getTotalSeconds();
int dst = Math.toIntExact(zoneRules.getDaylightSavings(instant).getSeconds());代码示例来源：origin: com.github.seratch/java-time-backport
if (trans.toEpochSecond() < loopWindowStart.toEpochSecond(loopWindowOffset) == false &&
trans.toEpochSecond() < window.createDateTimeEpochSecond(loopSavings) &&
trans.getOffsetBefore().equals(trans.getOffsetAfter()) == false) {
transitionList.add(trans);
loopSavings = rule.savingAmountSecs;内容来源于网络，如有侵权，请联系作者删除！
