Add reiwa era

Signed-off-by: Carlos Quiroz <[email protected]>

Author: cquiroz

core/shared/src/main/scala/org/threeten/bp/chrono/JapaneseEra.scala

@@ -74,13 +74,19 @@ object JapaneseEra {
     */
   lazy val HEISEI: JapaneseEra = new JapaneseEra(2, LocalDate.of(1989, 1, 8), "Heisei")
 
+  /**
+    * The singleton instance for the 'Reiwa' era (2019-05-01 - current)
+    * which has the value 3.
+    */
+  lazy val REIWA = new JapaneseEra(3, LocalDate.of(2019, 5, 1), "Reiwa")
+
   /**
     * The value of the additional era.
     */
-  private[chrono] val ADDITIONAL_VALUE: Int = 3
+  private[chrono] val ADDITIONAL_VALUE: Int = 4
 
   private[chrono] lazy val KNOWN_ERAS: AtomicReference[Array[JapaneseEra]] = new AtomicReference(
-    Array(MEIJI, TAISHO, SHOWA, HEISEI)
+    Array(MEIJI, TAISHO, SHOWA, HEISEI, REIWA)
   )
 
   /** Obtains an instance of {@code JapaneseEra} from an {@code int} value.

core/shared/src/main/scala/org/threeten/bp/chrono/internal/TTBPJapaneseEra.scala

@@ -24,17 +24,17 @@ object TTBPJapaneseEra {
     */
   def registerEra(since: LocalDate, name: String): JapaneseEra = {
     val known = JapaneseEra.KNOWN_ERAS.get
-    if (known.length > 4)
+    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.HEISEI.since))
+    if (!since.isAfter(JapaneseEra.REIWA.since))
       throw new DateTimeException(
-        "Invalid since date for additional Japanese era, must be after Heisei"
+        "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, 5)
-    newArray(4) = era
+    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

tests/shared/src/test/scala/org/threeten/bp/chrono/TestJapaneseChronology.scala

@@ -134,10 +134,13 @@ class TestJapaneseChronology extends AnyFunSuite with AssertionsHelper {
   }
 
   val data_japansesEras: List[(Era, Int, String)] = {
-    List((JapaneseEra.MEIJI, -1, "Meiji"),
-         (JapaneseEra.TAISHO, 0, "Taisho"),
-         (JapaneseEra.SHOWA, 1, "Showa"),
-         (JapaneseEra.HEISEI, 2, "Heisei"))
+    List(
+      (JapaneseEra.MEIJI, -1, "Meiji"),
+      (JapaneseEra.TAISHO, 0, "Taisho"),
+      (JapaneseEra.SHOWA, 1, "Showa"),
+      (JapaneseEra.HEISEI, 2, "Heisei"),
+      (JapaneseEra.REIWA, 3, "Reiwa")
+    )
   }
 
   test("test_Japanese_Eras") {
@@ -153,7 +156,7 @@ class TestJapaneseChronology extends AnyFunSuite with AssertionsHelper {
   }
 
   test("test_Japanese_badEras") {
-    val badEras: Array[Int] = Array(-1000, -998, -997, -2, 3, 4, 1000)
+    val badEras: Array[Int] = Array(-1000, -998, -997, -2, 4, 5, 1000)
     for (badEra <- badEras)
       try {
         val era: Era = JapaneseChronology.INSTANCE.eraOf(badEra)
@@ -180,9 +183,9 @@ class TestJapaneseChronology extends AnyFunSuite with AssertionsHelper {
       // ignore expected exception
     }
     val additional = TTBPJapaneseEra.registerEra(LocalDate.of(2100, 1, 1), "TestAdditional")
-    assertEquals(JapaneseEra.of(3), additional)
+    assertEquals(JapaneseEra.of(4), additional)
     assertEquals(JapaneseEra.valueOf("TestAdditional"), additional)
-    assertEquals(JapaneseEra.values.apply(4), additional)
+    assertEquals(JapaneseEra.values.apply(5), additional)
     try {
       TTBPJapaneseEra.registerEra(LocalDate.of(2200, 1, 1), "TestAdditional2")
       fail("JapaneseEra.registerEra should have failed")
@@ -202,7 +205,10 @@ class TestJapaneseChronology extends AnyFunSuite with AssertionsHelper {
       (JapaneseChronology.INSTANCE.date(1926, 12, 25), "Japanese Showa 1-12-25"),
       (JapaneseChronology.INSTANCE.date(1989, 1, 7), "Japanese Showa 64-01-07"),
       (JapaneseChronology.INSTANCE.date(1989, 1, 8), "Japanese Heisei 1-01-08"),
-      (JapaneseChronology.INSTANCE.date(2012, 12, 6), "Japanese Heisei 24-12-06")
+      (JapaneseChronology.INSTANCE.date(2012, 12, 6), "Japanese Heisei 24-12-06"),
+      (JapaneseChronology.INSTANCE.date(2019, 4, 30), "Japanese Heisei 31-04-30"),
+      (JapaneseChronology.INSTANCE.date(2019, 5, 1), "Japanese Reiwa 1-05-01"),
+      (JapaneseChronology.INSTANCE.date(2020, 12, 24), "Japanese Reiwa 2-12-24")
     )
 
   test("test_toString") {

tests/shared/src/test/scala/org/threeten/bp/format/TestDateTimeTextPrinting.scala

@@ -184,14 +184,14 @@ class TestDateTimeTextPrinting extends AnyFunSuite with AssertionsHelper {
     Locale.setDefault(Locale.CANADA) // Passes for US
     val formatDayOfWeek = DateTimeFormatter.ofPattern("cccc MMM d") // Thursday Jan. 25
     val dt              = LocalDateTime.of(2018, 1, 30, 11, 2, 45, 750000)
-    assertResult("Tuesday Jan 30")(dt.format(formatDayOfWeek))
+    assertResult("Tuesday Jan. 30")(dt.format(formatDayOfWeek))
   }
 
   test("formatTime_AM_PM") {
     Locale.setDefault(Locale.CANADA) // Fails for both US and CANADA
     val formatTime_AM_PM = DateTimeFormatter.ofPattern("h:mm a") // 10:15 PM
     val dt               = LocalDateTime.of(2018, 1, 30, 11, 2, 45, 750000)
-    assertResult("11:02 AM")(dt.format(formatTime_AM_PM))
+    assertResult("11:02 a.m.")(dt.format(formatTime_AM_PM))
   }
 
 }