org.threeten.bp.chrono.internal.TTBPJapaneseEra.scala Maven / Gradle / Ivy
package org.threeten.bp.chrono.internal
import org.threeten.bp.chrono.JapaneseEra
import org.threeten.bp.LocalDate
import org.threeten.bp.DateTimeException
import java.util.Arrays
object TTBPJapaneseEra {
/**
* Registers an additional instance of {@code JapaneseEra}. A new Japanese era can begin at
* any time. This method allows one new era to be registered without the need for a new library
* version. If needed, callers should assign the result to a static variable accessible across the
* application. This must be done once, in early startup code.
NOTE: This method does not
* exist in Java SE 8.
*
* @param since
* the date representing the first date of the era, validated not null
* @param name
* the name
* @return
* the { @code JapaneseEra} singleton, not null
* @throws DateTimeException
* if an additional era has already been registered
*/
def registerEra(since: LocalDate, name: String): JapaneseEra = {
val known = JapaneseEra.KNOWN_ERAS.get
if (known.length > 5)
throw new DateTimeException("Only one additional Japanese era can be added")
require(since != null)
require(name != null)
if (!since.isAfter(JapaneseEra.REIWA.since))
throw new DateTimeException(
"Invalid since date for additional Japanese era, must be after Reiwa"
)
val era = new JapaneseEra(JapaneseEra.ADDITIONAL_VALUE, since, name)
val newArray = Arrays.copyOf(known, 6)
newArray(5) = era
if (!JapaneseEra.KNOWN_ERAS.compareAndSet(known, newArray))
throw new DateTimeException("Only one additional Japanese era can be added")
era
}
}