Scala RoundingMode类代码示例

//设置package包名称以及导入依赖的类
package com.example

import java.util.UUID

import scaldi.Injector
import akka.actor.{Actor, ActorRef, PoisonPill}
import scaldi.akka.AkkaInjectable

import scala.math.BigDecimal.RoundingMode

class OrderProcessor(implicit inj: Injector) extends Actor with AkkaInjectable {
  import Messages._

  val priceCalculator = injectActorRef [PriceCalculator]

  def receive = idle

  val idle: Receive = {
    case orderInfo @ ProcessOrder(user: User, itemId: Long, netAmount: Int) =>
      println(s"Processing order for user $user.")

      priceCalculator ! CalculatePrice(netAmount)

      context become workingHard(orderInfo, sender)
  }

  def workingHard(orderInfo: ProcessOrder, reportTo: ActorRef): Receive = {
    case CancelProcessing =>
      reportTo ! OrderProcessingFailed("Canceled..")
      self ! PoisonPill
    case GrossPriceCalculated(_, grossPrice) =>
      println("Processing order.....")

      reportTo ! OrderProcessed(UUID.randomUUID().toString, grossPrice)
      self ! PoisonPill
  }
}

class PriceCalculator extends Actor {
  import Messages._

  def receive = {
    case CalculatePrice(netAmount) =>
      val grossCent = (netAmount * BigDecimal("1.19")).setScale(0, RoundingMode.HALF_UP).toIntExact
      sender ! GrossPriceCalculated(netAmount, grossCent)
  }
} 

//设置package包名称以及导入依赖的类
package com.outr.stripe

import scala.math.BigDecimal.RoundingMode

class Money private(val value: BigDecimal) {
  override def equals(obj: scala.Any): Boolean = obj match {
    case m: Money => m.value == value
    case b: BigDecimal => b == value
    case _ => false
  }

  def pennies: Long = (value * 100.0).toLongExact

  override def toString: String = f"$$$value%1.2f"
}

object Money {
  def apply(d: BigDecimal): Money = new Money(d.setScale(2, RoundingMode.HALF_EVEN))
  def apply(d: Double): Money = apply(BigDecimal(d))
  def apply(pennies: Long): Money = apply(BigDecimal(pennies) / 100.0)
  def apply(s: String): Money = apply(BigDecimal(s))
} 

//设置package包名称以及导入依赖的类
package fi.kajstrom.efpscala.E36

import scala.math.BigDecimal.RoundingMode


class StatisticsCalculator {
  def calculate(numbers: Vector[Int]) : Statistics = {
    var minimum = 0
    var maximum = 0
    var average = 0.0
    var stdDeviation = 0.0


    //Exercise constraint is to use loops. I'd prefer collection methods otherwise.
    numbers.foreach((number: Int) => {
      if (number < minimum) {
        minimum = number
      } else if (minimum == 0) {
        minimum = number
      }

      if (number > maximum) {
        maximum = number
      }

      average += number
    })

    average = average.toDouble / numbers.length

    //Std deviation
    numbers.foreach((number: Int) => {
      var diffFromMean = number - average
      diffFromMean = scala.math.abs(diffFromMean)
      diffFromMean = diffFromMean * diffFromMean

      stdDeviation += diffFromMean
    })

    stdDeviation = stdDeviation / numbers.length
    stdDeviation = scala.math.sqrt(stdDeviation)
    stdDeviation = BigDecimal(stdDeviation).setScale(2, RoundingMode.HALF_UP).toDouble

    Statistics(
      average,
      minimum,
      maximum,
      stdDeviation
    )
  }
}

case class Statistics(average: Double, minimum: Int, maximum: Int, standardDeviation: Double) {} 

//设置package包名称以及导入依赖的类
package fi.kajstrom.efpscala.E36Actor

import akka.actor.Actor

import scala.math.BigDecimal.RoundingMode

class StandardDeviationCalculator extends Actor{
  def receive = {
    case calculate: Calculate => {
      context.parent ! StandardDeviationCalculated(calculate.requestId, standardDeviationOf(calculate.numbers))
    }
  }

  def standardDeviationOf(numbers: Vector[Int]): Double = {
    var stdDeviation = 0.0
    val average = numbers.sum / numbers.length

    //Std deviation
    numbers.foreach((number: Int) => {
      var diffFromMean = number - average
      diffFromMean = scala.math.abs(diffFromMean)
      diffFromMean = diffFromMean * diffFromMean

      stdDeviation += diffFromMean
    })

    stdDeviation = stdDeviation / numbers.length
    stdDeviation = scala.math.sqrt(stdDeviation)

    BigDecimal(stdDeviation).setScale(2, RoundingMode.HALF_UP).toDouble
  }
}

case class StandardDeviationCalculated(reguestId: Int, standardDeviation: Double) 

//设置package包名称以及导入依赖的类
package org.aguo.civsim.model.domain

import org.aguo.civsim.model._

import scala.math.BigDecimal.RoundingMode
import Console._

sealed trait Job {
  def render: String = s"$YELLOW$toString$RESET"
  def examine(world: World): String
}

object Job {
  def unapply(string: String): Option[Job] = string match {
    case "farmer" => Some(Farmer)
    case "builder" => Some(Builder)
    case _ => None
  }
}

sealed trait FoodJob extends Job {
  def foodProduction(world: World): BigDecimal

  override def examine(world: World): String = {
    s"$render produces ${GREEN}${foodProduction(world).setScale(2, RoundingMode.HALF_UP)} food${RESET}."
  }
}

case object Farmer extends FoodJob {
  override def foodProduction(world: World): BigDecimal = {
    1.2
  }
}

trait ProductionJob extends Job {
  def production(world: World): BigDecimal

  override def examine(world: World): String = {
    s"$render has ${RED}${production(world).setScale(2, RoundingMode.HALF_UP)} production${RESET}."
  }
}

case object Builder extends ProductionJob {
  override def production(world: World): BigDecimal = {
    1.0
  }
} 

//设置package包名称以及导入依赖的类
package places

import clients.{GooglePlacesClient, GooglePlacesClientSingleton}
import models.{AddressResult, DistanceResult}

import scala.concurrent.{ExecutionContext, Future}
import scala.math.BigDecimal.RoundingMode

object PlacesControllerSingleton extends PlacesController(GooglePlacesClientSingleton)

class PlacesController(placesClient: GooglePlacesClient) {

  def getDistanceResult(origin: String, destination: String)(implicit ec: ExecutionContext): Future[DistanceResult] = {
    val eventualOrigin = placesClient.getAddress(origin)
    val eventualDestination = placesClient.getAddress(destination)
    val eventualDistanceTo = placesClient.getDistance(origin, destination)
    val eventualDistanceFrom = placesClient.getDistance(destination, origin)
    val metersInMiles: BigDecimal = 1609.34
    for {
      distanceTo <- eventualDistanceTo
      distanceFrom <- eventualDistanceFrom
      distance = BigDecimal((distanceTo.inMeters + distanceFrom.inMeters) / 2.0)
      origin <- eventualOrigin
      destination <- eventualDestination
      miles: BigDecimal = (distance / metersInMiles).setScale(2, RoundingMode.FLOOR)
      result = DistanceResult(distance.toLong, miles, Some(origin), Some(destination))
    } yield result
  }

  def getAddress(address: String)(implicit ec: ExecutionContext): Future[AddressResult] = {
    placesClient.getAddress(address)
  }
} 

//设置package包名称以及导入依赖的类
package utils

import models.{Months, Transaction, Transactions}

import scala.collection.immutable.ListMap
import scala.math.BigDecimal.RoundingMode

object TransactionHelpers {

  def groupTransactionsByMonth(transactions: Transactions): Seq[((Int, Int), Seq[Transaction])] = {
    val transactionsWithoutTopUps = transactions.transactions.filterNot(_.isLoad)
    val groupedAndSortedByMonth = transactionsWithoutTopUps.groupBy(a => (a.created.getMonthOfYear, a.created.getYear)).toSeq.sortWith(_._1._1 > _._1._1).sortWith(_._1._2 > _._1._2)
    groupedAndSortedByMonth
  }

  def calculateRoundupsByMonth(accountId: String, transactions: Transactions)(accessToken: String): Map[String, BigDecimal] = {
    val byMonth = ListMap(transactions.transactions.filterNot(_.isLoad).groupBy(a => (a.created.getMonthOfYear, a.created.getYear)).toSeq.sortWith(_._1._1 > _._1._1).sortWith(_._1._2 > _._1._2): _*)

    byMonth.map {
      month =>

        val roundUps = month._2.map { eachMonth =>
          val roundedValue = (eachMonth.amount / 100 setScale(0, RoundingMode.UP)).abs
          val rawValue = (eachMonth.amount / 100).abs

          val roundUp = roundedValue - rawValue

          if (roundUp.equals(BigDecimal(0))) BigDecimal(1) // £1 roundups when transaction amount is whole number
          else roundUp
        }.foldLeft(BigDecimal(0))(_ + _)
        
        val formData = Map(
          "account_id" -> Seq(accountId),
          "type" -> Seq("basic"),
          "url" -> Seq(""),
          "params[title]" -> Seq(s"Round Up for ${Months(month._1._1)} ${month._1._2} - £$roundUps"),
          "params[body]" -> Seq(s"Round ups for ${Months(month._1._1)} ${month._1._2} - £$roundUps"),
          "params[image_url]" -> Seq("https://scontent-lht6-1.xx.fbcdn.net/v/t1.0-9/15871922_10212040156182063_1392533991348799017_n.jpg?oh=4669484d186b91d9b07911255a8d09d3&oe=5940244F")
        )

        //ws.url("https://api.monzo.com/feed").withHeaders(("Authorization", s"Bearer $accessToken")).post(formData)

        (s"${Months(month._1._1)} ${month._1._2}", roundUps)
    }
  }

} 

//设置package包名称以及导入依赖的类
package davidkellis.seven

import scala.math.BigDecimal.RoundingMode

object MathUtil {
  def ceil(decimal: Double): Double = Math.ceil(decimal)
  def ceil(decimal: BigDecimal): BigDecimal = decimal.setScale(0, RoundingMode.CEILING)

  def intCeil(decimal: Double): Int = ceil(decimal).toInt
  def intCeil(decimal: BigDecimal): Int = ceil(decimal).toInt

  def floor(decimal: Double): Double = Math.floor(decimal)
  def floor(decimal: BigDecimal): BigDecimal = decimal.setScale(0, RoundingMode.FLOOR)

  def intFloor(decimal: Double): Int = floor(decimal).toInt
  def intFloor(decimal: BigDecimal): Int = floor(decimal).toInt

  def round(decimal: Double): Double = Math.round(decimal)
  // see section on HALF_UP on http://docs.oracle.com/javase/6/docs/api/index.html?java/math/RoundingMode.html
  // -> on HALF_UP: "this is the rounding mode commonly taught at school"
  def round(decimal: BigDecimal): BigDecimal = decimal.setScale(0, RoundingMode.HALF_UP)

  def intRound(decimal: Double): Int = round(decimal).toInt
  def intRound(decimal: BigDecimal): Int = round(decimal).toInt
}