Class ZoneOffsetTransition
- java.lang.Object
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- javax.time.calendar.zone.ZoneOffsetTransition
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- All Implemented Interfaces:
Serializable
,Comparable<ZoneOffsetTransition>
public final class ZoneOffsetTransition extends Object implements Comparable<ZoneOffsetTransition>, Serializable
A transition between two offsets caused by a discontinuity in the local time-line.A transition between two offsets is normally the result of a daylight savings cutover. The discontinuity is normally a gap in spring and an overlap in autumn.
ZoneOffsetTransition
models the transition between the two offsets.Gaps occur where there are local date-times that simply do not not exist. An example would be when the offset changes from
+01:00
to+02:00
. This might be described as 'the clocks will move forward one hour tonight at 1am'.Overlaps occur where there are local date-times that exist twice. An example would be when the offset changes from
+02:00
to+01:00
. This might be described as 'the clocks will move back one hour tonight at 2am'.ZoneOffsetTransition is immutable and thread-safe.
- Author:
- Stephen Colebourne
- See Also:
- Serialized Form
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description int
compareTo(ZoneOffsetTransition transition)
Compares this transition to another based on the transition instant.boolean
equals(Object other)
Checks if this object equals another.OffsetDateTime
getDateTimeAfter()
Gets the transition date-time expressed with the 'after' offset.OffsetDateTime
getDateTimeBefore()
Gets the transition instant date-time expressed with the 'before' offset.Instant
getInstant()
Gets the transition instant.LocalDateTime
getLocal()
Gets the local date-time at the transition which is expressed relative to the 'before' offset.ZoneOffset
getOffsetAfter()
Gets the offset after the transition.ZoneOffset
getOffsetBefore()
Gets the offset before the transition.Period
getTransitionSize()
Gets the length of the transition as aPeriod
.int
hashCode()
Returns a suitable hash code.boolean
isGap()
Does this transition represent a gap in the local time-line.boolean
isOverlap()
Does this transition represent a gap in the local time-line.boolean
isValidOffset(ZoneOffset offset)
Checks if the specified offset is valid during this transition.static ZoneOffsetTransition
of(OffsetDateTime transition, ZoneOffset offsetAfter)
Obtains an instance defining a transition between two offsets.String
toString()
Returns a string describing this object.
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Method Detail
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of
public static ZoneOffsetTransition of(OffsetDateTime transition, ZoneOffset offsetAfter)
Obtains an instance defining a transition between two offsets.Applications should normally obtain an instance from
ZoneRules
. This constructor is intended for use by implementors ofZoneRules
.- Parameters:
transition
- the transition date-time with the offset before the transition, not nulloffsetAfter
- the offset at and after the transition, not null
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getInstant
public Instant getInstant()
Gets the transition instant.This is the instant of the discontinuity, which is defined as the first instant that the 'after' offset applies.
The methods
getInstant()
,getDateTimeBefore()
andgetDateTimeAfter()
all represent the same instant.- Returns:
- the transition instant, not null
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getLocal
public LocalDateTime getLocal()
Gets the local date-time at the transition which is expressed relative to the 'before' offset.This is the date-time where the discontinuity begins. For a gap, this local date-time never occurs, whereas for an overlap it occurs just once after the entire transition is complete. This method is simply
getDateTime().toLocalDateTime()
This value expresses the date-time normally used in verbal communications. For example 'the clocks will move forward one hour tonight at 1am' (a gap) or 'the clocks will move back one hour tonight at 2am' (an overlap).
- Returns:
- the local date-time of the transition, expressed relative to the before offset, not null
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getDateTimeBefore
public OffsetDateTime getDateTimeBefore()
Gets the transition instant date-time expressed with the 'before' offset.This is the date-time where the discontinuity begins expressed with the before offset. At this instant, the after offset is actually used, therefore this is an invalid date-time.
The methods
getInstant()
,getDateTimeBefore()
andgetDateTimeAfter()
all represent the same instant.- Returns:
- the transition date-time expressed with the before offset, not null
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getDateTimeAfter
public OffsetDateTime getDateTimeAfter()
Gets the transition date-time expressed with the 'after' offset.This is the first date-time after the discontinuity, when the new offset applies.
The methods
getInstant()
,getDateTimeBefore()
andgetDateTimeAfter()
all represent the same instant.- Returns:
- the transition date-time expressed with the after offset, not null
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getOffsetBefore
public ZoneOffset getOffsetBefore()
Gets the offset before the transition.This is the offset in use before the instant of the transition.
- Returns:
- the offset before the transition, not null
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getOffsetAfter
public ZoneOffset getOffsetAfter()
Gets the offset after the transition.This is the offset in use on and after the instant of the transition.
- Returns:
- the offset after the transition, not null
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getTransitionSize
public Period getTransitionSize()
Gets the length of the transition as aPeriod
.This will typically be one hour, but might not be. It will be positive for a gap and negative for an overlap.
- Returns:
- the length of the transition, positive for gaps, negative for overlaps
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isGap
public boolean isGap()
Does this transition represent a gap in the local time-line.Gaps occur where there are local date-times that simply do not not exist. An example would be when the offset changes from
+01:00
to+02:00
. This might be described as 'the clocks will move forward one hour tonight at 1am'.- Returns:
- true if this transition is a gap, false if it is an overlap
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isOverlap
public boolean isOverlap()
Does this transition represent a gap in the local time-line.Overlaps occur where there are local date-times that exist twice. An example would be when the offset changes from
+02:00
to+01:00
. This might be described as 'the clocks will move back one hour tonight at 2am'.- Returns:
- true if this transition is an overlap, false if it is a gap
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isValidOffset
public boolean isValidOffset(ZoneOffset offset)
Checks if the specified offset is valid during this transition.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.
- Parameters:
offset
- the offset to check, null returns false- Returns:
- true if the offset is valid during the transition
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compareTo
public int compareTo(ZoneOffsetTransition transition)
Compares this transition to another based on the transition instant.This compares the instants of each transition. The offsets are ignored, making this order inconsistent with equals.
- Specified by:
compareTo
in interfaceComparable<ZoneOffsetTransition>
- Parameters:
transition
- the transition to compare to, not null- Returns:
- the comparator value, negative if less, positive if greater
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equals
public boolean equals(Object other)
Checks if this object equals another.The entire state of the object is compared.
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hashCode
public int hashCode()
Returns a suitable hash code.
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