tag int as month via apply method

4 files changed, 21 insertions, 18 deletions

diff --git a/src/main/scala/xyz/driver/core/database/package.scala b/src/main/scala/xyz/driver/core/database/package.scala
index 32b240e..791a688 100644
--- a/src/main/scala/xyz/driver/core/database/package.scala
+++ b/src/main/scala/xyz/driver/core/database/package.scala
@@ -3,7 +3,7 @@ package xyz.driver.core
 import java.sql.{Date => SqlDate}
 import java.util.Calendar
 
-import date.Date
+import date.{Date, Month}
 import slick.dbio.{DBIOAction, NoStream}
 
 package object database {
@@ -18,7 +18,7 @@ package object database {
     // should only be interpreted in the running JVMs timezone.
     val cal = Calendar.getInstance()
     cal.setTime(sqlDate)
-    Date(cal.get(Calendar.YEAR), date.tagMonth(cal.get(Calendar.MONTH)), cal.get(Calendar.DAY_OF_MONTH))
+    Date(cal.get(Calendar.YEAR), Month(cal.get(Calendar.MONTH)), cal.get(Calendar.DAY_OF_MONTH))
   }
 
   private[database] def dateToSqlDate(date: Date): SqlDate = {
diff --git a/src/main/scala/xyz/driver/core/date.scala b/src/main/scala/xyz/driver/core/date.scala
index 37b9a09..b9bcacb 100644
--- a/src/main/scala/xyz/driver/core/date.scala
+++ b/src/main/scala/xyz/driver/core/date.scala
@@ -5,21 +5,24 @@ import java.util.Calendar
 object date {
 
   type Month = Int @@ Month.type
-  def tagMonth(value: Int): Month = value.asInstanceOf[Month]
 
   object Month {
-    val JANUARY   = tagMonth(Calendar.JANUARY)
-    val FEBRUARY  = tagMonth(Calendar.FEBRUARY)
-    val MARCH     = tagMonth(Calendar.MARCH)
-    val APRIL     = tagMonth(Calendar.APRIL)
-    val MAY       = tagMonth(Calendar.MAY)
-    val JUNE      = tagMonth(Calendar.JUNE)
-    val JULY      = tagMonth(Calendar.JULY)
-    val AUGUST    = tagMonth(Calendar.AUGUST)
-    val SEPTEMBER = tagMonth(Calendar.SEPTEMBER)
-    val OCTOBER   = tagMonth(Calendar.OCTOBER)
-    val NOVEMBER  = tagMonth(Calendar.NOVEMBER)
-    val DECEMBER  = tagMonth(Calendar.DECEMBER)
+    def apply(value: Int): Month = {
+      require(0 to 11 contains value, "Month is zero-indexed: 0 <= value <= 11")
+      value.asInstanceOf[Month]
+    }
+    val JANUARY   = Month(Calendar.JANUARY)
+    val FEBRUARY  = Month(Calendar.FEBRUARY)
+    val MARCH     = Month(Calendar.MARCH)
+    val APRIL     = Month(Calendar.APRIL)
+    val MAY       = Month(Calendar.MAY)
+    val JUNE      = Month(Calendar.JUNE)
+    val JULY      = Month(Calendar.JULY)
+    val AUGUST    = Month(Calendar.AUGUST)
+    val SEPTEMBER = Month(Calendar.SEPTEMBER)
+    val OCTOBER   = Month(Calendar.OCTOBER)
+    val NOVEMBER  = Month(Calendar.NOVEMBER)
+    val DECEMBER  = Month(Calendar.DECEMBER)
   }
 
   final case class Date(year: Int, month: Month, day: Int) {
@@ -40,7 +43,7 @@ object date {
     def fromString(dateString: String): Option[Date] = {
       util.Try(dateString.split("-").map(_.toInt)).toOption collect {
         case Array(year, month, day) if (1 to 12 contains month) && (1 to 31 contains day) =>
-          Date(year, tagMonth(month - 1), day)
+          Date(year, Month(month - 1), day)
       }
     }
   }
diff --git a/src/main/scala/xyz/driver/core/json.scala b/src/main/scala/xyz/driver/core/json.scala
index 4c5d078..457a087 100644
--- a/src/main/scala/xyz/driver/core/json.scala
+++ b/src/main/scala/xyz/driver/core/json.scala
@@ -84,7 +84,7 @@ object json {
   implicit val monthFormat = new RootJsonFormat[Month] {
     def write(month: Month) = JsNumber(month)
     def read(value: JsValue): Month = value match {
-      case JsNumber(month) if 0 <= month && month <= 11 => date.tagMonth(month.toInt)
+      case JsNumber(month) if 0 <= month && month <= 11 => Month(month.toInt)
       case _                                            => throw DeserializationException("Expected a number from 0 to 11")
     }
   }
diff --git a/src/main/scala/xyz/driver/core/time.scala b/src/main/scala/xyz/driver/core/time.scala
index cbb86ed..ed5eb11 100644
--- a/src/main/scala/xyz/driver/core/time.scala
+++ b/src/main/scala/xyz/driver/core/time.scala
@@ -30,7 +30,7 @@ object time {
     def toDate(timezone: TimeZone): date.Date = {
       val cal = Calendar.getInstance(timezone)
       cal.setTimeInMillis(millis)
-      date.Date(cal.get(Calendar.YEAR), date.tagMonth(cal.get(Calendar.MONTH)), cal.get(Calendar.DAY_OF_MONTH))
+      date.Date(cal.get(Calendar.YEAR), date.Month(cal.get(Calendar.MONTH)), cal.get(Calendar.DAY_OF_MONTH))
     }
   }