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;