Initial commit with standard lib, might be used a example of cake

1 files changed, 79 insertions, 0 deletions

diff --git a/src/main/scala/com/drivergrp/core/time.scala b/src/main/scala/com/drivergrp/core/time.scala
new file mode 100644
index 0000000..645c991
--- /dev/null
+++ b/src/main/scala/com/drivergrp/core/time.scala
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+package com.drivergrp.core
+
+import java.text.SimpleDateFormat
+import java.util.{Calendar, Date, GregorianCalendar}
+
+import scala.concurrent.duration.Duration
+
+object time {
+
+  // The most useful time units
+  val Second = 1000L
+  val Seconds = Second
+  val Minute = 60 * Seconds
+  val Minutes = Minute
+  val Hour = 60 * Minutes
+  val Hours = Hour
+  val Day = 24 * Hours
+  val Days = Day
+  val Week = 7 * Days
+  val Weeks = Week
+
+
+  case class Time(millis: Long) extends AnyVal {
+
+    def isBefore(anotherTime: Time): Boolean = millis < anotherTime.millis
+
+    def isAfter(anotherTime: Time): Boolean = millis > anotherTime.millis
+
+    def advanceBy(duration: Duration): Time = Time(millis + duration.length)
+  }
+
+  case class TimeRange(start: Time, end: Time)
+
+  implicit def timeOrdering: Ordering[Time] = Ordering.by(_.millis)
+
+
+  def startOfMonth(time: Time) = {
+    make(new GregorianCalendar()) { cal =>
+      cal.setTime(new Date(time.millis))
+      cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH))
+      Time(cal.getTime.getTime)
+    }
+  }
+
+  def textualDate(time: Time): String =
+    new SimpleDateFormat("MMMM d, yyyy").format(new Date(time.millis))
+
+  def textualTime(time: Time): String =
+    new SimpleDateFormat("MMM dd, yyyy hh:mm:ss a").format(new Date(time.millis))
+
+
+  object provider {
+
+    /**
+      * Time providers are supplying code with current times
+      * and are extremely useful for testing to check how system is going
+      * to behave at specific moments in time.
+      *
+      * All the calls to receive current time must be made using time
+      * provider injected to the caller.
+      */
+
+    trait TimeModule {
+      def time: TimeProvider
+    }
+
+    trait TimeProvider {
+      def currentTime(): Time
+    }
+
+    final class SystemTimeProvider extends TimeProvider {
+      def currentTime() = Time(System.currentTimeMillis())
+    }
+
+    final class SpecificTimeProvider(time: Time) extends TimeProvider {
+      def currentTime() = time
+    }
+  }
+}