final class TzdbZoneRulesProvider extends ZoneRulesProvider
Loads time-zone rules for 'TZDB'.
This class is public for the service loader to access.
Specification for implementors
This class is immutable and thread-safe.
- Exceptions thrown
ZoneRulesException
if unable to load
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- new TzdbZoneRulesProvider()
Creates an instance.
Creates an instance. Created by the
ServiceLoader
.- Exceptions thrown
ZoneRulesException
if unable to load
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- def provideRefresh: Boolean
SPI method to refresh the rules from the underlying data provider.
SPI method to refresh the rules from the underlying data provider.
This method provides the opportunity for a provider to dynamically recheck the underlying data provider to find the latest rules. This could be used to load new rules without stopping the JVM. Dynamic behavior is entirely optional and most providers do not support it.
This implementation returns false.
- returns
true if the rules were updated
- Attributes
- protected
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- ZoneRulesProvider
- Exceptions thrown
DateTimeException
if an error occurs during the refresh
- def provideRules(zoneId: String, forCaching: Boolean): ZoneRules
SPI method to get the rules for the zone ID.
SPI method to get the rules for the zone ID.
This loads the rules for the region and version specified. The version may be null to indicate the "latest" version.
- returns
the rules, not null
- Attributes
- protected
- Definition Classes
- TzdbZoneRulesProvider → ZoneRulesProvider
- Exceptions thrown
DateTimeException
if rules cannot be obtained
- def provideVersions(zoneId: String): NavigableMap[String, ZoneRules]
SPI method to get the history of rules for the zone ID.
SPI method to get the history of rules for the zone ID.
This returns a map of historical rules keyed by a version string. The exact meaning and format of the version is provider specific. The version must follow lexicographical order, thus the returned map will be order from the oldest known rules to the newest available rules. The default 'TZDB' group uses version numbering consisting of the year followed by a letter, such as '2009e' or '2012f'.
Implementations must provide a result for each valid zone ID, however they do not have to provide a history of rules. Thus the map will always contain one element, and will only contain more than one element if historical rule information is available.
The returned versions remain available and valid for the lifetime of the application. A dynamic provider may increase the set of versions as more data becomes available.
- zoneId
the zone region ID as used by { @code ZoneId}, not null
- returns
a modifiable copy of the history of the rules for the ID, sorted from oldest to newest, not null
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- protected
- Definition Classes
- TzdbZoneRulesProvider → ZoneRulesProvider
- Exceptions thrown
ZoneRulesException
if history cannot be obtained for the zone ID
- def provideZoneIds: Set[String]
SPI method to get the available zone IDs.
SPI method to get the available zone IDs.
This obtains the IDs that this
ZoneRulesProvider
provides. A provider should provide data for at least one region.The returned regions remain available and valid for the lifetime of the application. A dynamic provider may increase the set of regions as more data becomes available.
- returns
the unmodifiable set of region IDs being provided, not null
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- Definition Classes
- TzdbZoneRulesProvider → ZoneRulesProvider
- Exceptions thrown
ZoneRulesException
if a problem occurs while providing the IDs
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